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Home My WebLink About20210022.tiffUSE BY SPECIAL REVIEW (USR) APPLICATION FOR PLANNING DEPARTMENT USE: AMOUNT $ APPLICATION! RECEIVED BY DATE RECEIVED: CASE # ASSIGNED: PLANNER ASSIGNED: PROPERTY INFORMATION (Attach additional sheets if necessary.) Is the property currently in violation? No / E Yes Violation Case Number: Site Address: 24020 WCR 4E, La Salle, CO 80545 Parcel Number: 1 o 5 3 _1 8 _ 2 _ o o _ 0 1 1 Legal Description: suss FT NIPI4 & PT S4"W4 18 4 84 240g0 45 Crt LASALLE 80645 Section: 18 , Township 04 N, flange 64 Zoning District: Agr Acreage: 9.5 Within subdivision? No / lies To nsite?. No l Yes If yes, subdivision or townsite name: Floodplain No 1 ill `des Geological Hazard No 1 M Yes Airport Overlay No / PROPERTY OWNER(S) (Attach additional sheets if necessary.) Name: Ensign United States Drilling INC. Yes Company: Ensign Well Services Name of proposed business: Ensign VVel l Services Phone #: 716-864-9203 Street Address: 24020 WCR 46 Elora i l: spencer.theriau It@ensig nenergy, cc rn City/State/Zip Code: La Salle, CO 80545 Name: Company: Phone #: Email: Street Address: City/State/Zip Code: APPLICANTIAUTHORIZED AGENT (Authorization must be included if there is are Authorized Agent) Name: Michael McDaniel Company: Landmark Builders, Inc. Phone #: 970-888-1788 Email: michael.mcdaniel@landrnarVbuilders.com Street Address: 3812 Carson Ave City/State/Zip Code: Evans, CO 80620 (We) hereby depose and state under penalties of perjury that all statements, proposals, and/or plans submitted with or contained within the application are true and correct to the nest of my (cur) knowledge. All fee owners of the property must sign this application. If are Authorized Agent signs, an Authorization Form signed by all fee owners must be included with the application. If the fee owner is a corporation, evid :� :s be included indicating the signatory has the legal authority to sign for the corporation, gn Michael McDaniel Print 07/06/2020 Date Signature Date Print 01/01/2020 DEPARTMENTS OF PLANNING BUILDING AND ENVIRONMENTAL HEALTH 1555 NORTH 17T" AVENUE REELEY, Co 80631 AUTHORIZATION FOR I, (We), _Ille� tat�give permission to Michael McDaniel (Owner — please print) (Authorized Agent please print) to apply for any Planning, Building or Septic permits on our behalf, for the property located at (address or parcel number) below: 24020 WCR 40. La Salle, Co 80645 PT NW419484 LOT 9 REC EXEMPTRECX12-0512 EXC COMM JAIIICCR NCO, E 29.27 NEIREI 42E. 4G TO Pty ® MIZE 1:1279 MA DIM wan Legal Description: T NOC1VNI7i� �Y PE�4,12:28{R=157a�?CH■9u1�12+�I�D2�l4S.Q7 Subdivision Name: of Section 18 , Township 04 N, Range_ _ 64 Lot Block Property Owners Information: Address: 2YD2o tat AZ yy LAr3aftGcs co 8O4,str- Phone: lib SIiK40 92.o3 Authorized Agent Contact Information: Address: 3812 Carson Ave. Evans, CO 80620 Phone: 970-888-1788 E-mail: asenter, -771 , h a `::se Correspondence to be seat to; Owner Additional Info: E -Mail: michasl,mcdaniel@landrnark-builders,cam Authorized Agent Bath Vitby Mail Email�� Owner Signature: Owner Signature: Date: 3 •ZD� 2o2o Late: Form W-9 (Rev. November 2005) Department of the Treasury Internal Flevenue Service Request for Taxpayer �Identification Number and Certification c‘i I blame (as shown on your income tax return) 0 Ensign Weil Services c Za U 02 ,c c a Check appropriate box: Ensign United States Drilling, Inc. Business name, if different from above Individual/ Sole proprietor Address (number, street, and apt. or suite no.) PO Box 17805 City, state, and ZIP code Denver, Colorado ao217 bei List account number(s) hare (optional) Corporation Partnership El Other "PP Taxpayer identification Number (Till Give form to the requester. Cho not send to the IRS. _ ... o . Exempt from backup withholding Requester's name and address (optional) Enter your TIN in the appropriate box. The TIN provided must match the .name given on Line 1 to avoid backup withholding. For individuals, this is your social security number (SSN). However, for a resident alien, sole proprietor, or disregarded entity, sere the Part i instructions on page 3.. For other entities it is your employer identification number (FIN). If you do not have .a number, see How to get a TIN on page 3. Note. If the account is in more than one name, see the chart can page 4 for guidelines on whose number to renter: Certification Under penalties of perjury, I certify that: Social security number 1 I + or i le er identification number 1, The number shown on this farm is my correct taxpayer identification number (or I am waiting for a number to be issued to me),and 2. I am not subject to backup withholding because: ,(a) I arra exempt from backup withholding, or (b) I have not been notified by the Interne/ Revenue Service (IRS) that I am subject to backup withholding as a result of a failure to report all interest or dividends, or (c) the IRS has notified me that i am no longer subject to backup withholding, and � j 3. I am a U.S. person (including a U.S. resident alien). Certification instructions. You must cross out item 2 above if you have been notifiesf by the IRS that you are currently subject to backup withholding because you have failed to report all interest and dividends on your tax return. For real estate transactions, item 2 does not apply. For mortgage interest paid, acquisition or abandonment of secured property, cancellation of debt, contributions to an individual retirement arrangement (IRA), and generally, payments other than interest and dividends, you are not required to sign the Certification, i cation, but ou must provide your correct TIN. (See the instructions on page 4.) y Sign Here SignatureSpencer'+ , wealb briar -Eva Ip �^��+cas��r,�ai.�.•��.-�cu=use,s. ■. . e' ` +.PR SRitPtiir� l5n .�u�:. {M'+�fw7h�rwlt'�ihilinenergy.mm � �/ person t� xm itetin to aedii Purpose of Form A person who is required to file an information return with the IRS, must obtain your correct taxpayer identification number (TIN) to report, for example, income paid to you, real estate transactions, mortgage interest you paid, acquisition or .abandonment of secured property, cancellation of debt, or contributions you made to an IRA. U.S. person. Use Form w-9 only if you are a U.S. person (including a resident alien), to provide your correct TIN to the person requesting it (the requester) and, when applicable, to: 1. Certify that the TIN you are giving is correct for you are waiting for a number to be issued), 2. Certify that you are not subject to backup withholding, or . Claim exemption from backup withholding if you are a U.S. exempt payee. In 3 above, if applicable, you are also certifying that as .a Q.J.S. person, your allocable share of any partnership income from a U.S. trade or business is not subject to the withholding tax on foreign partners' share of effectively connected income. Note. If a requester gives you a fora other than Form '-g to request your TIN, you (must use the requester's form if it is substantially similar to this Form W-9. For federal tax purposes: you are considered a person if you are: [date DP'' 1-1 201 e An individual who is a citizen or resident of the United States, • A ,partnership., corporation, company, or association created or organized in the (United States or under the laves of the United States, or • any estate (other than a foreign estate) or trust. See Regulations sections 301.7701-6(a) and 7(a) for additional information, Special rubs for partnerships. Partnerships that conduct a trade or .business in the United States are generally required' to pay a withholding tax on any foreign partners' share of income from such business. Further, in certain cases where a Form VV -9 has not been received, .a. partnership is required to presume that a partner is a foreign person, and pad'. the tr ithlholding tax. Therefore, if you are a U.S.. person that is a partner in a partnership conducting a trade or business in the United States, provide Form W-9 to the partnership to establish your U.S. status and avoid, withholding on your share of partnership income. The person vvho gives Form W-9 to the partnership for purposes of establishing its U.S. status and avoiding withholding on its allocable .share of net income from the partnership conducting a trade or business in the United States is in the following cases: o The U.S. owner of a disregarded entity and not the entity, Cat. No. 1i0201X Forrin Wag (Rev. 11-2005) U R QUESTIONNAIRE RESPONSES FOR ENSIGN UNITED STATES DRILLING 24020 WCR46 LA SALLE CO 80545 PLANNING QUESTIONNAIR 1. Ensign Well Services would like to permit the existing storage yard for oil and gas support equipment 2. The owner needs extra space for a storage of unused equipment. 3. Currently the lot is being used as a l ayd own yard for unused equipment 4. There are two residence in the area, the house is located across the road on the west side of Co Rd 46. This residence is +/- 250 L -F from the proposed laydown yard. The residence to the north is +/- 1000 L -F from the laydown yard. 5. This lot is surrounded with oil and gas infrastructure, with compressor stations, tank batteries, flare stacks and separators. The adjacent property to the west is owned by Nobel energy. The laydown lot seems to fall in line with how the surrounding lands are being used. The site is operational Sunday through Saturday twenty-four (24) hours a day. 7. The south lot is a laydown for the Ensigns north lot activities. There is technically zero employees located on this lot, but the overall number of employees will be approximately 25 people per shift with a max of approximately 70 people per day for Ensign. The shifts very from employee to employee with most work 8-12 hours a day ;per shift. 8. Maximum number of users is approximately 40. There is minimal traffic from patrons, members buyers or visitors due to the nature of it being a laydown yard.. 9. There will be no animals stored on this land. 10. Lot to be utilized as a laydown yard. The type of equipment being stored includes dewatering pumps, frac tanks, work over rigs, truck trails, semi's, and other small oil field equipment 11. There are no existing structures and no proposed structures. 12. There are no stockpiles present. The type of equipment being stored includes dewatering pumps, frac tanks, work over rigs (to be stored laydown, only erected for maintenance), truck trails, semi's, and other small oil field equipment. There are no waste areas. 13. No plan to store any debris, junk, or waste. Lot will be graded to accommodate drainage to a water quality pond,, which will commence after USR approval. This will remove any overgrowth. 14. Grading activities will begin after u5R approval. If Site screening is required, this will proceed after the dirt work activities. 15. There will be 5 specified laydown areas on the lot, as seen in the overhead view of the area. The Northernmost lot will have an area of approximately 30,000sf. The Easternmost lot will have an area of approximately 22,000sf. The Southernmost lot will have an area of approximately 24,000sf. The Westernmost lot will have an area of approximately 26,00!0sf. The center lot will have an area of approximately 41,000sf. The area consists of dirt and some gravel areas. 15. There are no passenger or handicap vehicle parking. The lot will consist of equipment storage with approximately 125 spots 17. Currently there is no screening on this site. The proposed screening will be 8' tall and run along the south and west side of the laydown yard. There is currently a barbed wire fence (41 tall surrounding the lot. 1 . Existing landscaping is nonexistent` It is proposed to grade the lot and install a water quality pond on the South west corner of lot. Weeds will he mitigated. 19. This laydown yard will not he phased out 20. No new fire protection infrastructure. There is a hydrant and retention pond to the north of the laydown yard. 21. Oil and gas support are a use by special review in weld county, and this use furthers that cause. (Goal 7- A.Policy 7.1. County land use regulations should support commercial and industrial uses that are directly related to, or dependent upon, agriculture, to locate within the agricultural areas, when the impact to surrounding properties is minimal, or can be mitigated, and where adequate services are currently available or reasonably obtainable. A.Policy icy 7.2. Conversion of agricultural land to nonurban residential, commercial, and industrial uses should be accommodated when the subject site is in an area that can support such development and should attempt to be compatible with the region.) 22, oil and gas support are a use by special review within the Ag. District, and per "23-3-20- Intent" it states "The A (Agricultural) Zone District is intended to provide areas for the conduct of agricultural activities and activities related to agriculture and agricultural production, and for , without the interference of areas for natural resource extraction and energy development other, incompatible land USES." 23. Not within a master plan or municipalities. Adjacent to oil 24. Existing use that is not anticipated to change. 26. No irrigation on this parcel. 26. We do not believe it to he in a special district. 27. Not required under this use. PUBLIC WORKS QUESTIONNAIR and gas infrastructure on all sides. 1. The oil and gas laydown yard .has an existing site entrance and exit it thought the north lot via the existing entrances and exits. There are no proposed new access points. The existing access is 620 linear feet to the north. 2. No proposed changes to existing access. 3. There are no changes to any gates planned. 4. The existing access will remain unchanged in its current location 6. There is no visual obstruction on any of the entrance or exits. 6. Then you leave the parcel you will need to make a mild curve to make it to the north parcel. Once through the north parcel there will he a sharp curve onto Co Rd. 46 and progressing crest there will he another sharp curve onto Co Rd. 49. If turning east on Co Rd 46 from the north parcel access there are no curves. 7. Surrounding road are relatively flat with some slight hills. ENVIRONMENTAL HEALTH QUESTIONS 1. The drinking water source on the property Is from Central Weld County, however this is utilized only in the office spaces, not the southern storage lot this report applies to. 2. Not required the employee's will not be using any serer infrastructure on this site. Those accommodations are on the north lot. 3. Extra or unused equipment owned by Ensign Well Services will be stored on this site on designated laydown spots. The type of equipment being stored includes dewatering pumps, frac tanks, work over rigs (to be stored laydown, only erected for maintenance), truck trails, semi's, and other small oil field equipment. 4. There will be no storage of waste, chemicals, or petroleum. 5. There will be no full storage on this site. 6. There will be no vehicles or equipment washing on this site. 7. There will be no floor drains. 8. There will be no air emissions. 9. See attached operations plan. 10. See below a. Unpaged roads will be watered for dust control. b. On -site vehicle speeds will be restricted to reduce amount of generated dust. c deeds on the property will not be allowed to grow over 12 inches high. BUILDING QUESTIONS 1. No structures will be erected for this proposal. 2. No structures exist on this site. 3. No structures exist nor will be eructed on this site. Chris Gathman From: Sent: To: Subject: Michael McDaniel <Michael.McDaniel@landmark-builder.com> Wednesday, September 02, 2020 4:49 PM Chris Gathman RE: PRE2o-0085 Completeness Review Comments - remaining items to address Caution: This email originated from outside of Weld County Government. Do not click links or open attachments unless you recognize the sender and know the content is safe. Chris I forgot to add this to the end of the sentence: Question #1: The types ofequipment will be stored onsite is not listed —what types of oil and gas equipment? Also are there going to be cargo containers onsite long-term and if so— how many? • The type of equipment being stored includes dewatering pumps, frac tanks, work over rigs (to be stored laydown, only erected for maintenance), truck trails, semi's, and other small oil field equipment. There are 2 cargo containers, 1 that's is used as a lean-to and another to store weather sensitive parts before they go to the field and these 2 containers are permanent. Have a great day, Michael McDaniel, Project Manager Landmark Builders Inc. 3 812 Carson Ave. Evans, CO 80620 Cell- 970-080-1780 Office- 970-330-0855 E t: 3002 L� i LAN D BUILDERS Roc, From: Michael McDaniel Seat: Wednesday, September 2, 2020 4:26 PI'S To: 'Chris Gathman' <cgathman@weldgov.cono Subject: RE: PRE20-0085 Completeness Review Comments - remaining items to address Afternoon Chris, highlighted items that are still outstanding: • NiA questions have been expanded on. • The type of equipment being stored includes dewatering pumps, frac tanks, work over rigs (to be stored layrdown, only erected for maintenance), truck trails, semi's, and other small oil field equipment. • Has been corrected on R2, attached. don't see that the NA responses from Environmental Health (per the original USR Questionnaire pdf attachment) were filled out. • Has been added into R2, attached. Question 1: The types of equipment will be stored onsite is not listed — what types of oil and gas equipment? Also — are there going to be cargo containers onsite long-term and if so - how many? • The type of equipment being stored includes dewateri ng pumps, frac tanks, work over rigs (to be stored laydown, only erected for maintenance), truck trails, semi's, and other small oil field equipment. There are 2 cargo containers! 1 that's is used as a lean-to and another to store weather sensitive parts before they go to the filed. In regards to Questions 21 and 22 are unclear: • Corrected on attached R2 What do you mean that oil and Gas Support is a Use by Right? Oil and Gas Support and Service (including this use) is a Use by Special Review and not a Use by Right in the Agricultural Zone per the weld County Code. • Corrected on attached R2 You refer to goal 7 in the Comprehensive Plan — but this is unclear which Goal you are referring to — I would take the language from the goal along with the section # and input this into your response. Corrected on attached R2 Additionally, we should have all the community outreach in regards to the screen fence done by tomorrow or Friday, and I will forward it to you. Let me know if there is anything else. Thanks Have a great day, Michael McDaniel, Project Manager Landmark Builders Inc. 3812 Carson Ave. Evans, Co 80620 Cell- 970-888-1788 Office- 970-330-8855 Ext: 3002 LIE3 i LANDMARK BUILDERS INC. From: Chris Gathman <cgathman@weldgov.com> Seat: Wednesday, September 2, 202012:06 PM To: Michael McDaniel <Ivlichael.McDaniel@landmark-builders.com> Subject: FW: RRE20-0085 Completeness Review Comments - remaining items to address Dear Michael, highlighted items that are still outstanding: don't see that the IAA responses from Environmental Health (per the original USR Questionnaire pdf attachment) were filled out. Question ##1: The types of equipment will be stored onsite is not listed — ghat types of oil and gas equipment? Also — are there going to be cargo containers onsite long-term and if so — how many? In regards to Questions 21 and. 22 are unclear: What do you mean that oil and Gas Support is a Use by Right? Oil and Gas Support and Service (including this use) is a Use by Special Review and not a use by Right in the Agricultural Zone per the Weld County Code. You refer to goad 7 in the Comprehensive Plan — but this is unclear which Goal you are referring to I would take the language from the goal along with the section ## and input this into your response. 2 Regards, Chris Gathman Planner III Weld County Department of Planning Services 1555 N. 17th Avenue tel: 97th -400-353 7 fax 970-400-4098 Confidentiality Notice: This electronic transmission and any attached documents or other writings are intended only for the person or entity to which it is addressed and may contain information that is privileged, confidential or otherwise protected from disclosure. If you have received this communication in error, please immediately notify sender by return e-mail and destroy the communication. Any disclosure, copying, distribution or the taking of any action concerning the contents of this communication or any attachments by anyone other than the named recipient is strictly prohibited. From: Michael McDaniel <Itilichael.McDaniel@landmark-builders.com> Sent Wednesday, September 02, 2020 10:29 AM To: Chris Gathman <cgathman@weldgov.com> Subject: ICE: PRE20-0085 Completeness Review Comments - remaining items to address Caution, This email originated from outside of Weld County Government. Igo not click links or open attachments unless you recognize the sender and know the content is safe. Morning Chris, had a secondary revision to this document that I received through an internal review. I'm not sure these revisions will matter in the greater scheme of things, but I have clarified some additional responses. Have a great day, Michael McDaniel, Project Manager Landmark Builders Inc. 3 812 Carson Ave. Evans, CO 80620 Cell -4970!-888-1788 Office- 970-330-8855 Ext 3002 LANnmARK BUILDERS INC. 3 From: Michael McDaniel Sent: Monday, August 31, 2020 5:00 PM To: 'Chris Gathman' <cgathman@weldgov.com> Subject: RE: PRE2o-0o$5 Completeness Review Comments - remaining items to address Afternoon Chris, Please see attachedquestionnaire and questions below. I ended up just redoing the questions to the new format. See the attached comment below per Environmental Health. application is confusing. application states a rezoning from Ag to oil and gas which is incorrect. ,Tease add the correct zone district. Address how sewer will be provided. If you have any questions regarding Environmental Health comments — you can contact Lauren Light — Ilighteldgov.com or 970-400-2211 • Both Eric and I have reached out and clarified this. Has been correct, no rezoning. See the attached comments below per Planning: Application Questionnaire • The questionnaire attached do not match the questionnaire #s and format in the attached USR application. The responses shall match the order of the questionnaire in the application form. Your pre -application meeting was conducted prior to our reprised application going online. You can either utilize the questionnaire under are old USR form or the revised USR application form questionnaire. Both are attached. • Please see attached • ,Each question needs a response — if a question is NA — explain why. • Please see attached • Planning Questionnaire response a creeds clarification This is a Use by Special Review (USR) — not a change of zone application — the zoning of the property will not change. Also — I Mould indicate the types of ,equipment that are/will be stored on -site. There is a difference 'visually...) between storing pipes vs. storing drilling platforms... • ,Please see attached • Planning Questionnaire response c creeds clarification — this is not a change of zone. • Please see attached • Planning Question #2 —This is not an answer - Explain how this use is consistent with the comprehensive plan. More Specifically the Agricultural Goals and Policies and Oil and Gas Goals and policies of the Weld County Code. You do not need to include all of the goals and policies — just the one's you think apply to this use/application. • Please see attached • Planning Question 116 —This is not a rezoning. Not .sure you want to .state that the use is 'noncompliant". • Please see attached USR Map: • I am not clear what type of surface the equipment is being stored on - is it gravel, dirt, grass...? • Lot is mostly dirt with some gravel SPo Meeting: 4 • Since you are requesting to waive fencing screening — have you had any contact with the neighboring property owners about this facility and the upcoming request? • We ore currently getting all the outreach done and have some but not all documentation back. This will still be forthcoming this week. Please let me know if you have any questions or concerns. Thanks Have a great day, Michael McDaniel, Project Manager Landmark Builders Inc. 3812 Carson Ave. Evans, CO 80620 Cell- 970-888-1788 Office- 970-330-8855 Ext: 3002 LANDMARK BUILDERS INC. From: Chris Gathman agathman@weldgov.com> Sent: Thursday, August 27, 2020 10:35 A To: Michael McDaniel <Michael.McDaniel@landmark-huilders.com> Subject: PRE2o-0085 Completeness ReviewComments - remaining items to address Importance: High Dear Michael, See the attached comment below per Environmental Health: application is confusing. application states a rezoning from Ag to oil and gas which is incorrect. Please add the correct zone district. Address how sewer will be provided. If you have any questions regarding Environmental Health comments —you can contact Lauren Light — Ilighteldgov.com or 970-400-2211 See the attached comments below per Planning: Application Questionnaire The questionnaire attached do not match the questionnaire Its and format in the attached USR application. The responses shall match the order of the questionnaire in the application form. Your pre -application meeting was conducted prior to our revised application going online. You can either utilize the questionnaire under are old USR form or the revised USR application form questionnaire. Both are attached. Each question needs a response — if a question is NA — explain why. • Planning Questionnaire response a needs clarification — This is a Use by Special Review (USR) — not a change of zone application — the zoning of the property will not change. Also — f would indicate the types of 5 equipment that areiwill be stored on -site. There is a difference (visually...) between storing ,pipes vs. storing drilling platforms... • Planning Questionnaire response c needs clarification - this is not a change of zone, • Planning Question #— This is not an answer- Explain hates this use is consistent with the comprehensive plan. More Specifically the Agricultural Goals and Policies and Oil and Gas Goals and policies of the Weld County Code. You do not need to include all of the goals and Policies —just the one's your think apply to this use/application. • Planning Question #6 — This is not a rezoning. Not sure you want to state that the use is "noncompliant". USR Map: • I a m not clear what type of surface the equipment is being stored on — is it gravel, dirt, grass,..? SPO Meeting: • Since you are requesting to waive fencing/screening — have you had any contact with the neighboring property owners about this facility and the upcoming request? LBI LAPJOMAFIK BUILDERS INC. July 17, 2020 3812 Carson Avenue Evans, CO 80620 970.330.8855 Rhone 970.330.5756 fax w ww ilandrnark-buiiders.corn Weld County Department of Planning Services Mr. Chris Gathman, Planner III 1555 N 17th Ave Greeley, CO 806 31 RE: Ensign Well Service — 24020 WC Ind 46, LaSalle, CO 80645 Perimeter fence with privacy screening Dear Mr. Gathman, We're Writing to address the perimeter screen wail fencing requirement for the Ensign Well Service property that was discussed during the North lot plan review conference with Weld County Department of Manning Services an xx/xx/2D. During this meeting it was brought to light that the current zoning classification of the south lot should be corrected. Also, at this meeting Weld County agreed to release the building addition permit with the caveat that we Would Work diligently and in good faith to resolve the south lot zoning issue. During the following pre -application review for the south Jot, Weld County suggested that we build a perimeter privacy fence (approx. 1,000 LF long and 6 to $ feet tall). On behalf of our client, we are respectfully requesting that this perimeter fencing requirement be waived. This area of Weld County has extensive oil and gas industry activity and we're aware of numerous similar yard facilities located on WC Rd 49 between Highway 34 and 1-7b that are in clear view of the public, i.e. Select Energy Services, just south of the Ensign property ion the corner of WCR 49 and WCR 34) has vast oil and gas facilities in full view. It is not unusual to have a new well being drilled, or a Workover derrick rig erected and operating in this area. Also, much of the infrastructure in the Ensign laydown yard (south lot) would still be visible over a 6'-g' privacy fence owing to the WC Rd 49 road topography adjacent to the Ensign property. Additionally, completely screening the yard from WC Rd 49 aright encourage theft and other malicious activity due to the limited exposure from the road. Thank you in advance for your time and consideration of this matter. Sincerely, Michael McDaniel Project Manager Untitled Map Write a description for your map_ h ron & 9/9 - No Response Outreach complete 9/2 homplete 9/9 Outreach on 9/1,9/2, 9/3, E h i nVVe l I ServiCes, & 9/9 - No Response •�_ Google earth © 2020. Google Request for Information LANDMARK BUILDERS INC Project Name [Ensign- South Lot From: Landmark Builders, Inc. Attention: Michael McDaniel — project Manager Email: Michaelmcdaniel landmark-builders,co Rhone: 970-888.3002 Cell: 970-8881?88 LEO project # 20-oB-403 Per the attached plans, Ensign would like to reach out to the neighbors in the vicinity to see how they feel about the site at 24020 WCB 46, LaSalle Co 80645. During a small addition on the North lot the county is requesting a screen fence around the South laydo n lot. The South lot primarily used for storing extra equipment and is usually not as full as it is now; this is due to a slowdown in oil and gas work. By signing below, you acknowledge having talked with a representative for Ensign regarding the site screening, please fill out the bottom line with your Name, address, yes or no on the screening, and your signature. Name Address Yes Respectfully, Michael McDaniel Landmark builders Inc. 3812 Carson Aire Evans, CO 80620 A. No Signature LB LANDMARK aim ()Fos 'NG,. 14 Request for Information Project Name LBI Project # Ensign- South Lot From: Landmark Builders, Inc. Attention: Michael McDaniel — Project Manager Email: ici��6. cd�r�ie1�`►Iancirmark-builders_.corn Phone: 970-888.3002 Cell: 970-888-1788 20-05-403 Per the attached plans, Ensign would like to reach out to the neighbor's in the vicinity to see hoer they feel about the site at 24020 WCR 46, LaSalle Co 80645. During a small addition on the north let the county is requesting a screen fence around the South laydawn lot The South lot primarily used for storing extra equipment and is usually net as full as it is now; this is due to a slowdown in ail and gas war's. By signing below, you acknowledge having talked with a representative for Ensign regarding the site screening. Please fill out the bottom line with your Name, address, yes or no on the screening, and your signature. Name Yes No Signature Address I 7C04-44-airee-spc� tit t :, '." drt n I � A S 4 l 1.„ Nit S71.4 fet. k c Respectfully, Michael McDaniel La.ndrnark builders Inc. 3812 Carson Ave. Evans, CO 80620 LBI ND ARK BUILDERS INC, Request for Information Project Name LBI Project # Ensign- South Lot 2O -O5 -4D3 From: Landmark Builders, Inc. Attention: Michael McDaniel — Project Manager Email: Michael.) cdaniel@landmark-bu€lderstom Phone: 970-888.3002 Cell: 97O-888-1788 Per the attached plans, Ensign would like to reach out to the neighbors in the vicinity to see hove they feel about the site at 2402O WCR 46, LaSalle Co 8064,5, During a small addition on the North lot the counter is requesting a screen fence around the South laydown lot. The South lot primarily used for storing extra equipment and is usually not as fall as it is now; this is due to a slowdown in oil and gas work. By signing below, you acknowledge having talked with a representative for Ensign regarding the site screening. Please fill out the bottom line with your Name, address, yes or no on the screening, and your signature. Name Address Yes No Signature � if irritiO , ...1 NIL, (lica/ ted/C Dir%rk LP+ SC? 4) ( 01 go zi5c Respectfully, Michael McDaniel Landmark builders Inc. 3812 Carson Ave. Evans, CO 80620 LB Request for Information LANDMARK 6UIl PER6 INC Project game LBI Project # Ensign- South Lot 2B-oS-403 From: Landrnark Builders, Inc. Attention: Michael McDaniel — Project Manager Email: lichaeLMcdanie[ I landmark-duidders.com Rhone: 970-888.3002 Cell: 970-888-1'88 Per the attached plans, Ensign would like to reach out to the neighbors in the vicinity to see homer they feel abort the site at 24020 WCR 46, LaSalle Co 80645. During a seta ll addition can the North lot the county is requesting a screen fence around the South laydouwrn lot, The South lot primarily used for storing extra equipment and is usually not as full as it is now; this is due to a slowdown in nil and gas work. By signing below, you acknowledge hawing talked with a representative for Ensign regarding the site screening. Please fill out the bottom lime with your fame, address, yes or no on the screening, and your signature. Name Address Yes No Signature iirin(‘MAr�ef 2d)ofc> at�1� 1�5a1aL �( r Respectfully, Michael McDaniel Landmark builders Inc. 3812 Carson Ave. Evans, CO 80620 LANDMARK BUILDERS rrwc _ i B 4 i III Request for Information Project Name LBI Project # Ensign- South Lot 20-05-403 From: Landmark Builders, Inc. Attention: Michael McDaniel — Project Manager Email: ichaeleMcdaniel@l_andmark-builders.corn Rhone: 970-88$.3002 Cell* 970-888-1788 Per the attached plans, Ensign would like to reach out to the neighbors in the vicinity to see hoer they feel about the site at 24020 WCR 46, LaSalle Co 80645, During a small addition on the North lot the county is requesting a screen fence around the South laydon lot. The South lot primarily used for storing; extra equipment and is usually not as full as it is now; this is due to a slowdown in oil and gas work. By signing below, you acknowledge having tallied with a representative for Ensign regarding the site screening. Please fill out the bottom line with your Name, address, yes or no on the screening, and your signature, Name Address � Yes . No Si nature DI�►N � �ii,�Iii- v� Ic, �2j� 9 C q 5lat2 lir z 71/V0 -12--y 14411 Cd° Respectfully, Michael McDaniel Landmark builders Inc. 3812 Carson Ave. Evans, CO 80620 LANDMARK auttocRs �. Request for Information Project Name LBI Project # Ensign- South Lot 20-05-403 From: Attention: Email: Phone: Cell: Landmark Builders, Inc. Michael McDaniel — Project Manager MichaelMcdaniel@lancimark-builders.com 970-888.3002 970-888-1788 Per the attached plans, Ensign would like to reach out to the neighbors in the vicinity to see how they feel about the site at 24020 WCR 46, LaSalle Co 80645. [wring a small addition on the North lot the county is requesting a screen fence around the South laydown lot. The South lot primarily used for storing extra equipment and is usually not as full as it is now; this is due to a slowdown in oil and gas work. By signing below, you acknowledge having tallied with a representative for Ensign regarding the site screening. Please fill out the bottom line with your Marne, address, yes or no can the screening, and your signature. Name Address Yes No Signature 'Sort\ leckG'9vci\ as-rucw, . Orsimin, a ket4ss Cs:n(0i toova Rs IA tadifite,.. cad ydvit )( 744e-rie Respectfully, Michael McDaniel Landmark builders Inc. 3812 Carson Ave. Evans, CO 80620 ..sue LANDMARK BUI L °FRS INC Ensign- South Lot Request for Information Project Marne LBI Project # 20-05-403 From: Landmark Builders, Inc. Attention: Michael McDaniel — Project Manager Email: Michael, cd� iel lancirroftabuilciers.corn Phone: 970-888.3002 Cell: 970-888-1788 Per the attached plans, Ensignwould tike to reach out to the neighbors in the vicinity to see how they feel about the site at 24020 WCR 46, LaSalle Co 80645. During a small addition on the North lot the county is requesting a screen fence around the South laydown lot. The South lot primarily used for staring extra equipment and is usually hot as full as it isnow; this isdue toaslowdown inoilandgas work. By signing below, you acknowledge having talked with a representative for Ensign regarding the site screening. Please fill out the bottom line with your Marne, address, yes or no on the screening, and your signature, Yes No Signature 4 Name Address I 64, Da gar-, O7414 (_,,ititip� We:2 ) LILQi‘i) , 12 ' Co , i a d (--t S k��r5 _ Respectfully, Michael McDaniel Landmark builders Inc. 3812 Carson Ave, Evans, CO 80620 LB I ch: Request for Information LANDMARK Hul�oFns mc,ROIL ()FRS INN, Ensign- South Lot Project Name LBI Project # From: Landmark Builders, Inc, Attention: Email: Michael McDaniel — Project Manager michaeIivicda ielPIandmark-'builders,co m Phone: 970-888.3002 Cell; 970-888-1788 2a -o5-403 Per the attached plans, Ensign would like to reach out to the neighbors in the vicinity to see hors they feel about the site at 24020 WCR 46, LaSalle Co 80645. During a small addition on the Borth lot the county is requesting a screen fence around the South laydown lot. The South lot primarily used for storing extra equipment and is usually not as full as it is now; this is due to aslowdown in oil and gas work. By signing below, you acknowledge having talked with a representative for Ensign regarding the site screening. Please fill out the bottom line with your Name, address, yes or no on the screening, and your signature, Name Address Yes No Signature bx,,,y, es 70)16kAlk 17 c ILL I r -73s-- kik Lag, Lai 4 Dv _ Respectfully, Michael McDaniel Landrna rk builders Inc. 3812 Carson Ave. Evans, CO 80620 B-3/46:sI LANDMARK BUI ()FRS INC Ensign- South Lot Request for Information Project Name LBI Project # From: Landmark Builders, Inc. Attention: Michael McDaniel — Project Manager Email: IVtichael vii clan elPlancimark-builders.com Phone: 970-883.3002 Cell: 970-888-1788 20-05-403 Per the attached plans, Ensign would like to reach out to the neighbors in the vicinity to see hove they feel about the site at 24020 WCR 46, LaSalle Co 30645. During a small addition on the Forth lot the county is requesting a screen fence around the South laydon lot. The South lot primarily used for storing extra equipment and is usually not as full as it is now; this is due to a slowdown in oil and gas work, By signing below, you acknowledge having talked with a representative for Ensign regarding the site screening. Please fill out the bottom line with your fume, address, yes or no on the screening, and your .signature, Address Yes Signature Warne 42D030 ak te r LotSafi?, eo 006Q 11',tort Velevihdr‘ Respectfully, Michael McDaniel Landmark builders Inc, 3812 Carson Ave. Evans, CO 80620 LB I Request for Information UWDMARK euRneps Project Name Ensign- South Lot From: Attention: Email: Phone: Cell: Landmark Builders, Inc. Michael McDaniel — Project Manager MichaelNicilaniel@landirlor buplders.com 970-888.3002 970-888-1788 LBI _ Project# 20-05-403 Per the attached plans, Ensign would like to reach out to the neighbors in the vicinity to see how they feel about the site at 24020 WCR 46, LaSalle Co 80645. During a small addition on the North lot the county is requesting a screen fence around the South laydown lot. The South lot primarily used for storing extra equipment and is usually not as full as it is now; this is due to a slowdown in oil and gas work. By signing below, you acknowledge having talked with a representative for Ensign regarding the site screening. Please fill out the bottom line with your Name, address, yes or no on the screening, and your signature, Yes Na Signature Name Address I eaese: 1 ea a g 9 j y 3 cis(' k id c.12_eA s-rgitisecy Respectfully, Michael McDaniel Landmark builders Inc. 3812 Carson Ave Evans, CO 80620 FINAL DRAINAGE REPORT FOR ENSIGN WELL SERVICES - SOUTH STORAGE AREA AT Lot A, Recorded Exemption No. 1053-18-2 RECX12-0042 Prepared For: Ensign Well Services 24020 County Road 46 LaSalle, CO 80645 Prepared By: WE NSMAN ENGINEERING AND LAND DEVELOPMENT LLC 16493 ESSEX RD PLATTEVILLE, CO 80651 (970) 539-2656 ATTN.: EFT WERNSMAN, P.E. SUBMITTAL GATE: October 22, 2020 t Engineer's Statement. I hereby certify that this report for the final drainage design of Lot Al Recorded Exemption No. 1053-18-2 RECX12-0O42, Weld County, CO was prepared by me (or under my direct supervision) for the responsible parties thereof. I understand that Weld County does not and shall not assure liability for drainage facilities designed by others. e""vo r BE r,r J ! J : r �- t i 'y. mat ` • • \ 4itQ . ! • • \ `I I��i ��1,��y��s�'��,��?4� Eric Wernsman Registered Professional Engineer State Colorado No. 33371 Contents I. GENERAI. LOCATION AND DESCRIPTION I.iM.Yw„�.,� 1 II. DRAINAGE BASINS AND SUB -BASINS .., ,....wr ................,.,........,, 2 III. DRAINAGE FACILITY DESIGN ..,.........wa.....••e••w.r................r...,.u.• ,...a.....,a....,........ 3 IV. SEDIMENT AND EROSION CONTROL ....r....r.w.4 ✓ . STo R MWATE R QUALITY ,..., 4 ✓ I. DESIGN METHODS 5 ✓ II. CONCLUSIONS 5 ✓ III. MAINTENANCE ISGlid li►a 6 IX. REFERENCES 6 Calculations Rainfall 7 Imperviousness • 10 Basin Runoff Rational Method...:..:........+..r...to 11 Water Quality Calculations . 14 Detention Pond Volume ,....., .....15 Spillway Calculations.16 Hydrologic Soil Group 17 Flood Plain Firmett..r...,,...,.,,,...., .....20 Vicinity Map,.r+r..* 21 FINAL DRAINAGE REPORT FOR Ensign well services - south Storage Area AT Lot A, Recorded Exemption No. 1058-18-2 RECx12-0042, VVeld County, Co I. GENERAL LOCATION AND DESCRIPTION A. Location This project will consist of gravel accesses around the interior of the site with outdoor container storage generally around the perimeter of the site. The project site is located in the northwest quarter of section 18, Township 4 North, Range 84 V'il'est of the sixth Principal Meridian in weld County, Colorado. The site lies at the southeast corner of Weld County Road 49 and Weld County Road 48. See page 20 for a vicinity map for the project site. B. Description of Property The site currently is approximately 9.4 acres and will be roughly 9.1 acres after future right-of-way for CR 49 is dedicated. The site is comprised of two (2) classified soils, according to the Natural Resources Conservation Service Web soil survey. The predominant soil that is present onsite is Vona loamy sand, 0 to 8 percent slopes (#72), which is in the Hydrologic Group "A". The other sail onsite is Olney fine sandy loam, 1 to 8 percent slopes (#47), which is in the Hydrologic Group "B". The percentage for each Hydrologic Group was used in the sizing for the required water quality capture volume. The purpose of the drainage design for the site is to provide water quality capture volume. There is an existing detention pond on Lot B, for the purposes of Lot B. With the exception of the drainage outlet structures, there are no permanent structures proposed with this development. i Currently, the existing site generally drains from east to west and then along the western property line to the south. From the southwestern corner of the property storm drainage continues to flow south along the eastern edge of CR 49 in an existing roadside Swale. II. DRAINAGE BASINS AND SUB -BASINS A. Major Basin Description There is no Weld County Master Drainage Plan for this site. Furthermore, the site is not within a mapped area for FEMA Map Number 08128C1775E (FIRM panel #1775 of 2250). See Firmette reap later in the report. Historically the site generally slopes from the east to the west and then north to south at an overall slope of approximately 1.8%. Lot B, to the north of the site, is partially developed and flows to a detention pond on Lot B. The outlet of this pond releases onto the site in this report. There is minimal offsite flow that enters the site. Also, there is an existing roadside ditch along the eastern side of CR 49 that captures runoff and conveys the flow from north to south. B. Sub -Basin Description The proposed development design will provide for water quality capture volume within a proposed pond located near the southwestern corner of the site. The pond has a design drain time of 40 hours, per Urban Drainage criteria. Developed runoff above the capacity of the water quality pond will spill to the southwest and flow towards the roadside ditch along the eastern side of CR 49. Imperviousness calculations and water quality calculations have been included to show the proposed runoff and pond volumes. The total drainage area used in this analysis is 9.05 acres. The drainage calculations for imperviousness take into account existing gravel and container storage areas as well as areas covered with existing vegetation. The area that the containers are on placed on were calculated as gravel. 2 The development has been divided into one (1) drainage basin as appropriate for the purpose of routing stormwater flows through the site, to the water quality pond. A short description for the basin can be found below: Sub -basin P1 : Sub -basin P1 contains 9.05 acres and includes the entire proposed site, except for the future right -or -way along the western edge of the site. Storm drainage runoff from this sub -basin is conveyed via overland flow and grass swale to the southwestern portion of the site where the proposed water quality pond is located. The imperviousness calculations assume a portion of the site that includes containers will be gravel. The imperviousness of Sub -basin P1 is 28% (C100=0.33) and the 100 -year runoff rate is 13.33 cubic feet per second (cfs) with an approximate 28 minute time of concentration. III. Drainage Facility► Design A. General Concept The general design concept for the subject site is to design and construct a storm drainage water quality pond with outlet structure and an emergency spillway. The 100 - year developed flow will be released through the water quality pond and into the existing roadside swale on the east side of CR 49. The expected 100 -year release from the site is 18.98 cfs, which includes the subject site with time of concentration of 28 minutes, as as well as 2.8 cfs release from the Lot B detention pond. The outlet from Lot B enters the site along the northern perimeter and will be passed through the overflow. The southeastern portion of the water quality pond will be bermed in order to provide an overflow spillway towards the existing roadside swale on the east side of CFA 49. Site grading will direct stormwater flaws to the southwestern portion of the site to the proposed water quality pond. The stormwater is routed to the pond via a combination of gravel and grass -lined swales. B. Specific Details Within Sub -basin P1 (28.89 cis — 100-yr event) the proposed conveyances direct storm drainage runoff from Sub -basin P1 from east to west and then to the southwest. Considering the water quality capture volume, the depth will be 1.8 feet. The invert of the pond has been set at 4795.50 and the water quality capture volume is 479?.30. 3 An emergency overflow spillway will be constructed with the proposed water quality pond. The spillway will be located in the southwest corner of the pond to direct runoff southwest to the existing roadside swale. Runoff rates have been reduced by the onsite water quality pond. The required volume of the water quality pond is 5052 cubic -feet (0.12 acre-feet) and 5085 cubic -feet have been designed for the pond, up to elevation 4707.30. Below is a summary of the detention pond design specifications: WATER QUALI Y POND SUMMARY CONTRIBUTING BASIN P1 4795.50 POND BOTTOM ELEVATION REQUIRED WOO/ (cubic feet) 5052 WQCV PROVIDED (cubic feet) 5085 � 4797.30 WG2S ELEVATION 1 WQ PLATE -NUMBER OF ROWS 1 WQ PLATE -NUMBER OF COLUMNS WQ PLATE -DIAMETER OF HOLES (inches) 0.7 4797.30 OVERFLOW ELEVATION 4798.00 TOP OF BERM 100-YR. OVERFLOW (cfs) at 28 min. 15.98 20 LENGTH OF SPILLWAY (feet) 0.4 DEPTH OF OVERFLOW (feet) IV. Sediment and Erosion Control Several erosion control methods will be utilized during and after construction. Temporary seeding will be placed on the ground in areas that will be exposed for over 30 days. The area of disturbance will be less than 10,000 square feet. V. Stormwater Quality Permanent BMPs will be incorporated into the project site, Water Quality capture volume has been provided within the onsite pond, and all disturbed areas will be reseeded. 4 I, Design Methods Worksheets are presented in the appendix of this report to show the methods and data used to design the project site. Most of these worksheets come from worksheet programs supplied by the Urban Storm Drainage Criteria Manual. Other worksheets are provided by the design engineer, using techniques recommended in the Urban Storm Drainage Criteria Manual (USDCM). The imperviousness of the drainage basins is determined by finding the weighted average of various impervious areas within each sub -basin. The hydrological data is calculated using the Rational Method, The water quality capture volume was calculated using the Urban Storm Drainage spreadsheets. VII. Conclusions The project design for the subject site is completed in compliance with the Urban Storm Drainage Criteria Manual and the Weld County Code. Erosion control methods such as silt fence and a vehicle tracking control pad will be utilized during construction. After completion of the project, disturbed areas will be reseeded. Vegetation and the finished surfaces will mitigate erosion in other disturbed portions of the site. 5 The fallowing is the drainage/site maintenance plan for the project. 1. At times erosion that may occur, the measures shall be corrected as soon as possible to mitigate the chance oferosion leaving the site. 2. Culverts shall be inspected regularly and cleaned if necessary. 3. Seeded areas that are not covered with vegetation shall be re -seeded and irrigated as necessary to establish permanent vegetation. 4. Snow should not be piled in swales or near water quality pond outlet. 8. Inspections of the drainage systems shall occur evert 2 weeks and after every rain event. Special attention shall be paid to the water quality pond orifice to insure it is free farm blockade. 6. Sediment and debris shall be removed immediately when detected in drainage ways or outlet. 7. Grasses and Weeds in water quality pond shall be kept less than 4" tall to less their impact on the water quality pond. I. References 1. Weld County Engineering and Construction Criteria (April, 2012). 2. Urban Stara Drainage Criteria Manual, Volumes 1 (Revised August 2018), 2 (Revised September 2017) and 3 (Revised November 2015/October 2019, Urban Drainage and Flood Control District, Denver, Colorado. 3. National Resources Conservation Service website: http://websoilsurvey. nres. usda.gov/app/WebSoilSurveyeaspx 6 Precipitation Frequency Data Server https://hdsc.nws.no .,gavihdsc/pfdpfdtprintpageehtml?lat=40.3 l 89&... NOAA► atlas 14. Volume 8, Version 2 Location name: La Salle, Colorado, USA* Latitude: 40,3189°. Longitude: -104.6011° Elevation: 4812.02 ft** source: LSRI r laps .* source. USES POINT PRECIPITATION FREQUENCY ESTIMATES Sarta Perica, Deborah Martin, Sandra Pavlovic, !shall Ropy, Mchael St. Laurent, Carl Trypaluk, Gale Unruh, Mchael Yekta, Geoffery Bortnin N4AA, National Weather Service, Silver Spring, Maryland PF tabular I PF graphical I Maps & aerials PF tabular PPS -based point precipitation frequency estimates with 90% confidence intervals (ire inches)1 Duration 1 2 5 Average recurrence Interval (years) I ,o 1[ zs I so ,00 5 -rain 10 -min 15-rnin 60 -nun 2 -hr 3 -hr 6 -hr 12 -hr 0.243 (0.198-0.301) 0.356 (0.291-0.441) 0.434 ('0,354-0.537) 5,583 (O,476 -0.72n 0.723 (0.5904).894 0.864 (0.710-1.06) 06946 (0,781-1.16) 1.09 (0.9106-1.32) 1.27 (1.07-1.53) 0.294 (0.240-0.365) 0.431 (0.351-0.534) 0,526 (4.428-0.651) 0.704 (0.574-0.s72) 0.392 (0.318-0.486) 0.485 2+00 500 0.633 0.762 (0.391-0.606) (0.498-0.845) (0.5791-1.03) 0.573 (0.465-00../y712) 0.6.19 (0.567-0.869) 0,936 (0.759-1.16) 0,861 1.14 (0.701-1.07) .1.921-1.41) 1.02 1.33 (4.835-/1.25) (1.09-1.64) 1,10 1.43 (0.909-1.35) (1.18-1.76) 1.28 "1.66 `x(1.06-1,55►) , (1.37-2.02) 1.51 1.96 (1.26-1.81) (1.63-2.36) 0.710 0.926 (0.572-0.887)(0.729.1.24) 1.13 (6.889-1.51) 1.52 (1.zax.as) 10.866 (0.698-1.08) 1.16 (0.935-1.45) 1.41 (1.14-1.76) 1.66 (1.35-2.05) 1.7'8 (1.45-2.19 1.86 (1.47-2.50) 2.05 2.20 (1.76-2.94) 2.36 (1.90-3.15) 2.69 (1.68-2.50) (2.17-3.54) 2.38 3.05 (1.97-2.89) (2,47-3.93) N 24 -hr 1.59 (1.28-1,80) 1.78 (1.50-2.12) 2 -day 3 -day 1.74 (1.48-2.05) 1.90 (1.62-2.23) 2.06 (1.75-2.43) 2.22 (1.90-2.61) 2.27 (1.91-2.71) 2.62 (2.,22-3.10) 2,72 3,42 (2.27-3.27) (2.74-4.34) 3.12 3.85 (2.62-3.71) (3.14-4.60) 2.78 (2.37-3.29) 3.29 (2.76-3.90) 4 -day 2.03 (1.74-2.37) 2.36 (2.02-2.76) 2,93; (2.50-3.44) 7 -stay 10 -day 20 -day 30 -day q as -day 2.31 (1.9'9-2.68) 2.55 (2.21-2.94) 3.2+6 (2.85-3.73) 3.83 (3.3+6-4.36) 4.53 (3.'99-5.13) i 2.89 (2.32-3.'12) 2.98 (2.57-3.44) 3.77 (3.28-4.31) 3.33 (2.86-3,88) 3.68 (3.17-4.26) 3.44 (2,92-4.05) 3,88 (3.31-4.54) 4.26 (3.65-4.97) 4,04 (3.30-5.00) 4.19 (3.44-5.16) 4.66 (3.84-5.67) 5,08 (4.19-6,'11) 1.12 (0.847-1.50) 1.35 (1.03-1.83) 1.83 (1.39.2.46) 2.26 (1.72-3.05) 2.68 (2.07-3.61) 2.90 (2.24-3.88) 3.27 (2.55..4.32) 3.64 (2.84-4.72) 4.02 (3.16-5.15) 4.46 (3.5305.62) 4.65 (3.70-5.83) 4.80 (3.83-5_.'99) 5.29 (4.24-6.52) 5,71 (4.60-6.98)j 4.58 (3.98-5.26) 5.24 6.14 6.52 (4.53-6.05) (5.09-7.28) (5.52-8.22) 4,40 (3.86-5.02) 5.20 (4.58-5.89) 60 -day 5,09 (4.50-5.74) 5.87 (5.19-6.63) 5.3'1 (4.64-6,07) 6.05 7.03 7.76 (5.25-6.94) (5.86-8.28) (6.32-9.29) 6,26 (5.49-7.11) 7.09 (6.24-8.0►2) 7.11 (6.20-8.11) 8.06 (7.44-9.15) 8.22 (6.88-9.61) 9.04 (7.39-10.7) 9.30 (7.79-10.8) 10.2 (8.36-12.1) 0.903 (0.656-1.25) 1.32 (0.963-1.83) 1.61 (1.17-2.,23) 2.17 (1.58-3.01) 2.70 (1.97-3.75) 3.23 (2.38-4.46) 3.50 (2.60-4.81) 3.91 (2.92-5.3'1) 4.27 (3.21-5.710) 4.66 (3.534.13) 5.10 (3.88-6.60) i 5-9 (4.05-6.61) 5.45 (4.184.98) 5.83 (4.5rB-7'.50) 6.36 (4.92-7.97) 7.45 (5.8,4-9.26) 8.47 (6.65-10.4) 9.82 (7,74-12.0) 11.1 (8.74-13,4) 1.06 (0.734-1.51) 1.55 (1.084.21) 1000 1.29 1.48 (0.651-1.89) (0.940-2.18) 1089 2.16 (1.254.77) (1.384.19) 1.89 2.30 2.54 (1.31-2,70) (1.52-3.38) (1,68-3,89) 155 (1.77-3.64) 3.20 (2.22.4.58) 3.85 (2,70-5.46) 4.19 (2.96-5.92) 4.65 (3.30-6.48) 4.98 (3.566.83) 5.37 (3.87-7.27) 5.78 (4.20---.7//....71) 5.98 (4.37-7.93) 3.11 3. ► (2.05.4,56) (2.27.5,26) 6.14 (4.50-8.10) 6.60 (4.86-8.59) 7.00 (5.18-9.05) 8.15 (6.08-10.4) 9.17 (6.88-11.6) 10.6 (7.98-13.3) 1'1.9 (5,97-14.8) 3.54 (2.61-5.79) 411 (3.19-6.9►5) 5.22 (3.51-7.57) 5.73 (3.89-8.21) 6.00 (4.10-8.47) 6.38 (4,40-8.89) 6.74 (4.68-9.25) 6.95 (4.86-9.48) 7.'11 (4.994.65) 7.50 (5.3040.1)T 7.87 (5.58-10.5) 9-00 (6.45-11.8) 10.1 (7.24-13.1) 11+5 (8.34-14.9) 12.8 (9.33-16.5) 4.56 (2.906.71) 5.1 (3.55-8.08 6.08 I (3.93-8.81) 6.64 (+x.33-9.52) , +6.84 (4.51-9.71) 7.20 (4.80-10.1) ; 7.50 (5.45-10.4) 7.72 (5.23-10.7) 7,88 (5.3fi-10.8) 8.21 (5.63-11.2) 8.53 I (5.8'9-11.6) 9.64 (6.72-12.9) 10.7 (7.52-14.3) 121 (8,61-16.1) 13.5 (9.60-17.6) 1 Precipitation frequency (PF) estimates in this table are based an frequency analysis of partial duration series (PDS). Lumbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (far a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum preapitation (PIMP) estimates and may be higher than currently valid PPP values. ,Tease refer to NOAA Atlas 14 document for more information. Back to Top PF graphical 1 of 4 8/2/2020, ;19 A Precipitation Frequency Data Server https://hdscsnws.naaa.gavlhdsc/pfdslpfds_printpage.htm l?l atr-40.3189&... Precipitationdepth (in) Precipitation depth (in) PDS-based depth -duration -frequency (DDF) curves Latitude: 40.318r, Longitude: -104.6011° • 1 • • • .L • • • • • r a r 14 1.0 Y 4 i wa• .. R.r • . . . . . • • r r_• ' a i a • R r _ • R 4 a • • • • . • • • • • • •• a • • • • • • a 5 10 NOAA Atlas :14, Volume 8. Version 2 • • • • a a • • • • • 1 : a a e • • h • km L V ♦i me f ib rti 4 Duration • • • • • • . • • • • : • • 1 • • a • • ♦ • r • a • a • • • • • J ' l • • • • • • • . • i • 1 • • • 1 a • 113 CO itit V V aY -510 6 eth Q6 �i rsl re) o7• CD a • • • • • 25 50 100 200 >� .Yra� /\F •Y�� ■ 1.0 " 500 1000 Average recurrence interval (years) Created WWI Sure Aug 2.12:19:13 2020 Back to Top MapS & aerials Small scale terrain fr—cerage recurrence anterval (years - 2 11 o 25 50 100 200' 500 1000 Duration as 10-mon 15-mon 30 -min 6 D -min 2 -tor 3 -hr 6 -hr 12 -hr 24 -hr t -day 3 -day 4 -day 7 -day 1D -day 20 -day 30 -day 45 -day 6t�iay 2 of 4 8/2/2020, b:19 Ali Precipitations Frequency Data Server https://hdsc.nws.n€ aa.gov/hdscfpfds/pfds_printpageghttnl?1at=40„31898... �f Lo Latham. Rvservai - o4 EASTON WALL EYVIE IRPORT large scale terrain Large scale aerial 3 of 4 8/2/2020, 6:19 AM Basin Imperviousness Ensign Well Services - South Lot 24020 CFA 49, Weld County, CO I Oil 5/2020 BASIN RUNOFF - southern Lot Land Use r Area (ft2) I (%) Impervious Area, Grass 114,595 , 2. Roofs - 90 Concrete Surfaces - 90 Asphalt/Pavement - L 100 Gravel, Riprap 279,762 40 Wghtd Avg & Total Area 394,357 A 29.0 i .c Wernsman En to W i .t tea) u o _ m ceo ico 3 � 'C .` 2 ' D i.12L "p a) Taira •5 o a O C? L L L- 42 1 L L E2 ea 03 Q 0 _O O 0 0 +0 0 Y' e.C T T 4- 0 0 O LO GI W a) X31O 0 O hQ L y ge- 1 T- ati: Wits C cu 03 .0) fa,O IMM o o n South Lot L a. U • ! 0 74 a 4.2 C .c.. E 0 ,Q ai L a ��f Y v. c r i . sNT � 0 0 r y� Q r 1 I. i r 0 lin P-- �`. � i l Lcsi ' M 04 O c r a o 1.-- 4 c v - L Iti 10 i co , ..',-. - T 'd L tV sr" i ---- T E r ! C; - 00 09 0 +-J C C in C.) 3 L. -- a O. _ C � tV __- 1 �- a) a E i ___ '5) U3 0 O < 1 / ,I LL 2 a z T� �5 i u I a) C.) co fie% C) Cri 1 T^++ a 1 a) L 03 J 2 0 3 CO O ram CO O CC was. rem ra^y r"h 4-) S� 0 . 4? 131) L '(1) T a. 0 V T 4-1 CU U ClJ J a) H • .3) 0 .N - C �E he, R0 a . up i V. O a'� a. U I 6 Tu C 'D �� C % t Q 5. ° 'L— ' i � C) 1' i a) c Lo war CO ta. 0 � O pi C 11- O O �/ W f 0 i _ I r..... CO I" i MM CD + C C _ C. •S t V 0 .i LLNI 0 C © _r i , CD C C RS -C C z cc 113 > ..... C Gi = 2 in Q. u) O o C O r-.. 03 03 c eD.a" W C_ u) O ID L ID 0 to • . N u a) _ V us O .c i a LL i a) . 1-7 O u- 0 03 _ 0 vs " � Q a > LL. O Cl' a 43 � a � i V � } 1 i W C 4 ..., :Ca 73 Os." q/��J seati CO> .i L c A� T ! W 4TH .— IL i 0 0 � .....I O ti: so c co C �. � A` ! 0 � 'C h W Fi IC D a 0 0 D o ca 0 to I ts 15 RS a) t 6. J Qi i- " O a i U O L O L 4A -y W C O {fJ wc W o L Lq 1 J o o >, 1�? L 'Es Ct O Q co ic ct CC mot' r ct O Q C Q O 0 N t�? �r 0 CSI I f. co C.0 CO fa O 1 -hour rainfal O O 0 LO ov N Rainfall Intensity Equation Coefficients = I O O tr) Izt- coo L CV se O o CO CO cri r L. to 47 U L.vs in N u5i I ED r to co 0) (N is N r Oa �'► o o in (w n 6 L a 1- 4 >1 6 0 r i in 0) (10 ('e} L s ... i w is a) #• in N o cri ... a. C s" CI p CO N OMNI r >I IA OD OD r" Ls N o it r 0 , 0 0 ta ...., 1.1 C O O iI O 0 cci N _ Qn ... a) gy CC E P. 'G . r. 0 ' s • a -.. a E 0 *La'C"? o 0 ■ 0 c mci co CO .. C WQC11 Cesi I I O 45 .co I I Go -61 so .C c I I E2 a L _ ,C3? N C' Q} 0 Irt1" O C.0 6 O 'im ,r— .T-' II LI 2s o `t a Ti3 0 a' o C .0 j .0 O to' a .. 0 o Cr. 1.0 I'm- LC) CSI I Il II II m � a a I- a ._ 3 I- o 2 2 c CL �. fzu CI a_ nformation C Watershed Desi .. 9 n Information 0 0,097 acre-feet 0.116 acre-feet CO 0 i3 c' to 75 cr co II li R R n co co � Ca. .C .C O CD O O CD Ca Cti .C L L a cu co a) a) co co co co CD CD (� tri? Ch .W . d C. O 0 CD 73 �-- I-- 10/19/2020, 11:26 AM STAGE -STORAGE SIZING FOR DETENTION BASINS Project. Basin ID: Design Information (Input): Width of Basin Bottom, W Length of Basin Bottom, L Earn Side -slope (H:V), Zd = Stare -Storage Relationship: W* Elie skitz ft ft ft►'ft L Righ Isosceles F Circl Check Basin Shape t Triangle a Triangle tectangle e 1 Ellipse Irregular , r Storage Requirement from Sheet 'Modified FAA': Storage Requirement from Sheet 'Hydrograph': Storage Requirement from Sheet 'Full -Spectrum': MINOR OR... OR... OR... OR... (Use Overide values, in cells G32:G52) MAJOR acre -ft. acre -ft. acre -ft. Labels for WOCV, Minor, & IVlajor Storage Stages (input) Water Surface Elevation ft (input) Side Slope (H:V) ft/ft Below El. Basin Width Stage ft (output) at Basin Length at Stage ft output Surface Area at Stage R2 (output) Surface Area Stage ft2 Overide at User Volume Below Stage ft3 (output) Surface Area at Stage acres (output) Volume Below Stage acre -ft (output) Target for & (for Volumes W OCV, Minor, Major Storage Volumes goal seek) 479'5.50 (input) 0 0.000 0.000 4796.00 0.00 0.00 2,040 510 0.047 0.012 4797.00 0.00 0.00 4,200 3,630 0.096 0.083 4797.30 0.00 0.00 5,500 5,085 0.126 0.117 WQOV 4797.80 0.00 0.00 5,700 7,885 0.131 0.181 4798.00 0.00 0.00 5,900 9:045 0.135 0.208 #NIA #N/A #NIA #NIA #N/A #N/A - #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N1A #N/A #N/A #N/A #N/A #N/A #N1A #NIA► #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A _ #N1A #N/A #N1A #N/A #N/A #NIA - #N/A #N/A - - #N/A #N1A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N1A #N/A #1\I/A #N/A #N/A #NIA #NIA #NIA #NIA #NIA #NIA #NIA #NIA #NIA #NIA #NIA #NIA #NIA #NIA - #NIA #NIA #NIA ##NIA EnsignUD-Detention_South.xls, Basin 10/19/2020, 11:30 AM CfJ a CO r � CYj 19 to r 0.41500159 I I 0) ItI �O O 0z H = (Q/Cd*'W)^.667 CO ce O a► O H = (Q/Cd*1W)^.667 o r l69 z yFr? V� M iSS SE °POT g c� a_ a� z a no a mt o, oM- O CC Z84, � .r a J 0 g(?) u� 2 W 0 Q MDSE 470T o-- 01E€91* '01/24— aLa€9fro- I I I I =Cat Ot0C9P17 0 fella" I 0g6Z9tt 03629:47 ow.est`v L to Ion gbO Cr. G a M .SS SE owoT Nap Scale: 1:11450 if printed 4n A landscape (11" x 8.5") sheet 0 M .8 SE ot7t1Z 4 as'Tr N CO CL f/} c> tol a 0 O g 47) ffi lore Z C 0_ c Q Go Q v o as c3 vs.0 pc c 45 n 't!? Q W ▪ 0 CO c0 0 >s, MAP LEGEND co O 3. eu .c E CD LO 0 010 a) Ili c� ■ o TS .E gio 5 0 4 '4) c ' ° +� it ai E G co cu •aVEc E m in t7 t f as 'a. e3 � o E C ZOOID o a� v � )Ca .caas en ' Ewelf E.F~ 0 Q -Q z •a caci' Eem ec a12 a g E _ c.) E D O w r Soil Rating Polygons Water Features ■ Streams and Canals Transportation Ai E Q [!7 O � c0 es.7 m c0 4) CO co t9 E a LU co 8 eu 8 CD I 8 0 � �' Q 0 m Et 0 2 — U3 Li CIO" 2 Li a co cc Z D E as > 2 zc E „cot 0 eu cn:0 0 en �O a E w 5 O m • nterstate Highways 40 to 05 IS CC CZ t .iir D 2 • a ic � el Vo �Qa)CO Q .0 °° Q..c C ♦, mwar .c m - +1--d a� ., �a GO as a} o. — 0 CO 0 c` 'c J:2 <8 � � a 0 c op fo ° co Q a a co 03 r2i 4C4 o. Local Roads Not rated or not available • Aerial Photography 2 an m tIi co Q ce Q E a) ;0 w c en co c c� ,0 v� a' �u co . a co _ c� Q N 60 O 05CM aen O .� C 0 le c .0 1:3 E gl >CD ai n k CO CD `co ' 0� ci.) U) Jul 191 2018 Aug images were photographed: — aa Caco esil CO ©� • co m O O v • • c � .r C i • Boll Rating Points c a� as C.,c a N 0 era f c � 'a3 a. �. E o 7:3 saa °E Q t! g El RI 0 we N u- 0 N a. a) is a c Q o. CQ) C .Q e v • L Q Go a E • ID t 1 a aa o z t i IS Hydrologic Sail Group —Weld County, Colorado, Southern P$rl Ensign - South Lot (CR 49!46) Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in Aol Percent of AOI 47 Olney fine 1 to 3 sandy loam, percent slopes B 2.2 23,96 72 Vona loamy percent slopes sand, 0 to 3 A 7.0 76.1% Totals for Area of Interest 9.1 100.0% Description Hydrologic soil groups are based on estimates of runoff: potential. Soils are assigned to one of four gaups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long -duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (AID, B/D, and CID). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sends. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slog rate of water transmission. Group D. Sails having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, sails that have a high water table, sails that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These sails have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the sails that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition USDA Natural Resources Web Soil Survey a Conservation Service National Cooperative Soil Survey 7/14/2020 Page 3 of 4 go • • SEE F1S REPORT FOR DETAILED LEGEND AND INDEX NEAP FOR FIRM PANEL LAYOUT LU CO 4.0 rz as cr, 0 cc, g ffi � � v e "§N Regulatory Floodway a) Nib to it z y C o M n3 1 c.c E l§ s 8 `, CCo t03 CU C �4 +r la'� 4 c VI al . � o e m � o 'n CO 49 X o o tr.0 C.)o3 I, O � .� di 3 J Area with Flood Risk due to Leveezo► e 0 Area of Undetermined Flood Hazard zone a a d C C Levee. Dike, or Floodwall 2 i1 — w s 0 i ZMIS Oc ct < 0 Er O W O LL OTHER AREAS Cross Sections with 1% Annual Chance 0 4) n CO J C 0 0 2 Lu M it 8 a o co 0 103 CO I I I e 1 "Q tl0 i -I- fl- Coastal Transect Baseline Profile Baseline Hydrographic Feature 1 Ct W W L Digital Data Available No Digital Data Available MAP PANELS E Ira 4-' CL 03 t c co 0 c v a za- p. uo c co co E CD Ca' 3 � C 0 t. o 20 ;ft g 43 co, u ea - ° }. �J C ice/? C 03 08.E e Tut 0 AO .0 0 cc 0 Lu ' 0 us, CO se '0R. S �. > d 15) a C E cA 0 ;r- C En Q d n 03 4ri E a vg E o iss 75- - *4° c © I, ,, 03 o 0 4 Q ten �w 0 t " 7� � C m 8< a Ne U Cu" a 0 esi co ° 0J � 44 � 4 m m C v co C to 0 C arr L4F C7 fo (1) O E ` to tom opt. _Q a oC 44."78 a 22 et S ,o 4 n 5is, ,2 4 E v E et CO C1 O a u E 15t;- N cam 43 gi c co 10 c C cc N Iff s+ aEi � P. L 03 % ' C 0 3 .3ie E 113 >QE• >E 0, as C o C C r tU C E to 723 E c �fl tts C- 0 Um. c P — Las 3 10'4°35'45"W 40°18' c a. C Q 3 CD ID O 04 CO I id V C, M 0 0 (4 C >4.id aI lam.N 4fisiONO_— —cii.(_ sad lisi to f � Cn V) W +-• . ...,I r L�� O z _ - .0 _ r<.. yi. 1 l�Ir' _.` . T' 0' $ �- s" alai -r f' . SOS•. L _ �, t :or ' Arm ii , 'E t 'Q 4) < CV CV M S I 1 .....r _ _ ___ _ _ - , • �b F --- .-±3. 1 - 'S "tY' _IIII eL u. � C 0 ` Nie E Q �.• i �' T V1 c ro t , .0 \ V ♦ 1 °° C a CO 1� r- G p 4Cfr e ,-;- ► • ,/1 - to I— OOffielPluree -; • 4. _ _ _ ' r ` ' ill' : - � ; r � Q V) a AI r 3111 CL o a 2 03 V VA 4•S VI Sal - 1 • - a" ira III 4.4 Qi 0 OS ms's... sii CCI b } 1 r • - Ir" is "le t - in 17>T rt.J4.-linj ,'• 'tie 4'I U ro al Lei:'E 43 s - - 1 r �* - n1 ., , - - t‘ I • .- i ,j ( ! ,t f Y R �� i F , i sl 4 , �+ J �` + .. - I t s`-- __- - - - ----- - - s - - -- u-+ it di LL " 1 , t 1 •.. - _.1 4 / . , d '- (_ *- 4 ni Nil: p•-- icr I • ..} • _ - _ t 1 �,,• , , ! Y i .. � . I - - - I w ,. ' - L. i a rid Jo _ T - OD �. - C. r _ _ "1�s �� t - _— is ..{J rsd � i7 �i� _ «-s _.+�¢ r " •.1 / r.� • a , 14 r -r r • _• ' •, r , • - Cr)lC MI , • _ 1 r _. - -' - rr',1/2 z- _ _ .. ›. s ..• .. ,, • „ 7,4 vte ..... — , .'4". - . .sue-� _7 VT its, _- .. r- .1aM 4) y� sVI e. tti w - m _ 4 717, LILT yy� ` �• i _ . r t r .• _ A i 0 ? /:/3� •y tea. _ _... 1 Q _.- "r, — .. J. A l tits r' . lit L � - a _if F. `y * j 1 • y * }/ • NI Iv �. C r r O C. Nil jtl I P a • - .,Smi s 1 .%f VII 0 zi FINAL DRAINAGE LETTER FOR ENSIGN WELL SERVICES - SOUTH STORAGE AREA AT Loot A, Recorded Exemption No, 1053484 RECXIZ-0042 Prepared For: Ensign Well Services 24020 County Road 46 LaSalle, CO 80645 Prepared By: E NSMAN ENGINEERING AND LAND DEVELOPMENT LL 16493 ESSEX FAD PLATTE 'I L LE, CO 80651 (970) 539-2656 ATTN.: EMC WERNSMAN, P.E. SUBMITTAL DATE: August 16, 2020 Engineer's Statement hereby certify that this report for the final drainage design of Lot A, Recorded Exemption No. 1053-18-2 ICE 1 -0 042, Weld County, CO was prepared by me (or under my direct supervision) for the responsible parties thereof. I understand that Weld County does not and shell not assume liability for drainage facilities designed by others. Eric I ernsman Registered Professional Engineer State Colorado No. 33371 FINAL DRAINAGE REPORT FOR Ensign Weil Services - South Storage Area AT Lot A, Recorded Exemption No. 1053-18-2 RECX 12-o042 i Weld County, co I. GENERAL LOCATION AND _ DESCRIPTION A. Location This project will consist of gravel accesses around the interior of the site with outdoor container storage generally around the perimeter of the site. The project site is located in the northwest quarter of Section 18, Township 4 North, Range 64 west of the Sixth Principal Meridian in Weld County, Colorado. The site lies at the southeast corner of Weld County Road 49 and Weld County Road 46, See page 20 for a vicinity map for the project site. B. Description of Property The site currently is approximately 9.4 acres and will be roughly 9.1 acres after future right-of-way for CR 49 is dedicated. The site is comprised of two (2) classified soils, according to the Natural Resources Conservation Service Web soil survey. The predominant soil that is present onsite is vo n a loamy sand, o to 3 percent slopes (#72), which is in the Hydrologic Group "A". The other soil onsite is Olney fine sandy loam, 1 to percent slopes (#47), which is in the Hydrologic Group "B". The percentage for each Hydrologic Group was used in the sizing for the required water quality capture volume. The purpose of the drainage design for the site is to provide water quality capture volume. There is an existing detention pond on Lot B, for the purposes of Lot B. There are no permanent structures proposed with this development. 1 Currently, the existing site generally drains from east to west and then along the western property line to the south. From the southwestern corner of the property storm drainage continues to flow south along the eastern edge of CR 49 in an existing roadside s ale. II. DRAINAGE BAsirslis AND SUB -BASINS A. Major Basin Descriotion There is no Weld county Master Drainage Plea for this site. Furthermore, the site is not within a mapped area for FEMA Map Number o3123C17758 (FIRM panel #1775 of 250). Bee Firmette reap later in the report. Historically the site generally slopes from the east to the west and then north to south at roughly 3%-5% slopes. Lot Ba to the north of the site, is partially developed and flows to a detention pond on Lot B. There is minimal offsite flow that enters the site. Also, there is an existing roadside ditch along the eastern side of CR 49 that captures runoff and conveys the flog from north to south. B. Stake -Basin De criltion The proposed development design will provide for grater quality capture volume within a proposed pond located near the southwestern corner of the site. The pond has a design drain titre of 40 hours, per Urban Drainage criteria. Developed runoff above the capacitor of the water quality pond will spill to the southwest and flow towards the roadside ditch along the eastern side of cR 49. Imperviousness calculations and grater quality calculations have been included to show the proposed runoff and pond volumes. The total drainage area used in this analysis is 9.05 acres. The drainage calculations for imperviousness take into account existing gravel and container storage areas as well as areas covered with existing vegetation. The development has been divided into one (1) drainage basin as appropriate for the purpose of routing stormwate r flogs through the site, to the water quality pond. 2 A short description for the basin can be found below Sub -basin P 1: Sub -basin P1 contains 9.05 acres and includes the entire proposed site, except for the future right -or -way along the western edge of the site. Storm drainage runoff from this sub -basin is conveyed via overland flow and grass Swale to the southwestern portion of the site where the proposed water quality pond is located. The imperviousness calculations assure a portion of the site that "includes containers will be gravel. The imperviousness of Sub -basin P1 is 28% (C100=0.60) and the 100 -year runoff rate is 26.89 cubic feet per second (cfs) with an approximate 23 minute time of concentration. III. Drainage Facility Design A. General Concept The general design concept for the subject site is to design and construct a storm drainage water quality pond with outlet structure and an emergency spillway. The 100 - year developed flow will be released through the water quality pond and into the existing roadside swale on the east side of CFA 494 The expected 100 -year release from the site is 29.5 cfs, which includes the subject site with time of concentration of 23 minutes, as as well as 2.6 cfs release from the Lot B detention pond. The southwestern portion of the water quality pond will provide an overflow spillway towards the existing roadside s ale on the east side of CFA 49. A specific overflow is not planned. The spillway will consist of an existing drainage path towards CR 49. Site grading will direct stormwater flogs to the southwestern portion of the site to the proposed water quality pond. The stormwater is routed to the pond via a combination of gravel and grass -lined swales. B. Specific Details Within Sub -basin P1 (2b.89 cfs --100-yr event) the proposed conveyances direct storm drainage runoff from Sub -basin P1 from east to crest and then to the southwest. 3 - -- Considering the water quality capture volume, the depth will be 1.8 feet. The invert of the pond has been set at 4795.50 and the water quality capture volume is 4797.30. The historical drainage path west of the pond will function as the emergency overflow. The spillway will direct runoff southwest to the existing roadside swa I e Runoff rates have been reduced by the onsite water quality pond. The required volume of the water quality pond is 4!875 cubic -feet (0,12 acre-feet) and 5085 cubic -feet have been designed for the pond, up to elevation 4797.30. Below is a summary of the detention pond design specifications; � WATER QUALITY POND SUMMARY CONTRIBUTING BASIN P1 _i 4795.50 POND BOTTOM ELEVATION REQUIRED WQCV (cubic feet) � 4,875 5085 WQCV PROVIDED (cubic feet) 4797.30 VMS ELEVATION 1 WQ PLATE -NUMBER OF ROWS WQ PLATE -NUMBER OF COLUMNS 1 5/8 WQ PLATE -DIAMETER OF HOLES (inches) 4791.30 OVERFLOW ELEVATION 'l00-YR. OVERFLOW (cfs) at 23 min, 29.E 6 0.29 DEPTH OF OVERFLEW (feet) I. Sediment and Erosion Control Several erosion control methods will be utilized during and after construction. Temporary seeding will be placed on the ground in areas that will be exposed for over 30 days. V. Storrmmater Maly( Permanent BlviPs will be incorporated into the project site, Water Quality Capture Volume has been provided within the onsite pond, and all disturbed areas will be reseeded. 4 VI. Design Methods Worksheets are presented in the appendix of this report to show the methods and data used to design the project site. Most of these worksheets come from worksheet programs supplied by the Urban Storm Drainage Criteria Manual. Other worksheets are provided by the design engineer, using techniques recommended in the Urban Storm Drainage Criteria Manual (USDCM). The imperviousness of the drainage basins is determined by finding the weighted average of various impervious areas within each sub -basin. The hydrological data is calculated using the Rational Method. The water quality capture volume was calculated using the Urban Storm Drainage spreadsheets. VII. Conclusions The project design for the subject site is completed in compliance with the Urban Storm Drainage Criteria Manual and the weld County Code. Erosion control methods such as silt fence will be utilized during construction. After completion of the project, disturbed areas will be reseeded. Vegetation and the finished surfaces will mitigate erosion in other disturbed portions of the site. VIII. Maintenance The following is the drainage/site maintenance plan for the project. 1. At times erosion that may occur! the measures shall be corrected as soon as possible to mitigate the chance of erosion leaving the site. 2. Culverts shall be inspected regularly and cleaned if necessary, 3. Seeded areas that are not covered with vegetation shall be re -seeded and irrigated as necessary to establish permanent vegetation. 4. Snow should not be piled in swales or near water quality pond outlet, 5. Inspections of the drainage systems s h ai I occur even 2 weeks and after every rain event. Special attention shall be paid to grater quality pond orifice to ensure it is free from blockage. 6, sediment and debris shall be removed immediately when detected in drainage ways or or outlet. 7. Grasses and weeds in water quality pond shall be kept less than 4" tall to lessen their impact on the water quality pond. 5 I. References 1. Weld County Engineering and Construction Criteria (April, 2012). . Urban Sturm Drainage Criteria Manual, Volumes 1 (Revised August 2018), 2 (Revised September 2017) and 3 (Revised November 20151October 2019, Urban Drainage and Flood Control District, Denver, Colorado. 3. National Resources Conservation Service websito: littn ivvebsoirsurvey.rires.usd_as oviap )/WebSoilSurvelvtaspx 6 3irecipitation Frequency Data Server https :I/h ds c i rms . noaa. gov11i d s cf p fd s/pfd tpri n tpage . htm ll at —A11318 984.. _ NOAA Atlas 14, Volume 8! Version 2 Location name: La Salle, Colorado, USA* Latitude: 40.3189°, Longitude: -104.8011° Elevation: 4812.62. ft** `source: ESRI Gaps "source: USG3 POINT PRECIPITATION FREQUENCY ESTIMATES 5anja Petite, Deborah Marlin, Sandra Pawloyio, Ishani Rini Michael 8t Laurent, Carl Trypaluk, Date Unruh, Michael Yekta, Geoffery Bcnnin NOPA, National Weather Service, Silver Spring, Maryland PF tabular I PF_graphical I Map8_taerials PF tabular I PDS-based point precipitation frequency estimates with 90% confidence intervals (in incties)1 = Average recurrence interval (years) Duration 5 -min 10 -min 15 -mitt 30 -min 60 -min 2 -hr 1 0,243 (O198-O.3xO1) 0.356 (O.291 -O.441) 0.434 (0.354-!07!.537) 2 (0.294 (0.240-0_365) 10.431 (0.351.0..534) 0,52£ (0 428-0_851), I 5 0.392 (0.318-0.486) 0.57,3 (0 465-0.712) 6.583 0.704 (0.47'x6-0 721) (O.574 -O 872) 3 -hr 6 -hr 12 -hr .24 -hr 6.'x'23 (0.591-0.895) 0.864 (0 7'10-1 08) 9.946 (0.781-1 16) 1.99 ((1.906-1 32) 1.27 (1 07-1.53) 1.51 (1.28-1.80) 0.851 (0 701-1,07) 1,02 (0' 835-1.25) 1.10 (O,OO9-1.35) 1.28 ('1.O6-1.5.5) 1.51 I ('1.26-1,81) 1.78 (1.50-2 12) 2 -day 1.74 (1.48.2.0.5) 3 -day 1.90 (1.62-2.23) 4 -day 2.03 (1.74.2.37) 7 -day 10 -day 28 -day 30 -day +45 -day 60 -day 2.31 (1 99-2,66) 2.56 (2.2`1-2.94) 3..26 (2 85-3 73) 3.83 (3,36-4,36) 2.06 (1.75.2.43) 2.22 (1.90-2.6'1) 2.36 (2.02,2.76) 2,69 (2.32-3 12) 2.88 (2.57.3.44) 4,53 (3_'99-5,13) 3.77 (3 28-4.31) 4.40 (3.88-5.02) 5.210 (4.58-5.89) 10 f _ 25 .- 0.485 (0.633 (O,391-x].6O5) (O.498.O.845) 8.719 0.926 (0.572.0.887) ('O.729 -1.2!x) 0.69'9 I +0.866 (0.567-0.869) (0,698-1,C16) 6.936 1.15 (O.759-1,16) (0 935-1 .45) 1.14 1.41 (0.921-1.41) (1.14-1.76) 1.33 (1.09-1 €4) 1.43 (1.18-1 76) 1.66 (1,37-2.02) 1.96 (1,63-2 36) 2.27 (1 91-2,71) n2.82 (2 22-3.10) 1.13 (0.889-1 51) 1.62 (1.19-2.03) 1.86 (1.47-2.50) l0.762 0.903 (0.579.1.03) (0 658.1;.29) 1,12 1.32 (0.847.1.50) (0-963.1 83) 1.66 (1.35-:2.O5) 1.78 (1.45-.219) 2.20 (1 76,2'.94) 2.36 (1.90-3.15) 2.05 (1 X68-2 50) 2.35 (1 97-2 89) 2.72 (2.27.3,27) 3.12 (2 82-3 71) 2.79 (2..37-3.29) 2.69 (217-3.54) 3.05 (2.x47-3.93) 3,42 (2_78.4 3,,,86 (3 14-4.80) 3.29 4.04 (2.7x6-3,90) (3.30.5.00) 3.44 (2.92-4.05) 3.88 (3 31-4 54) 3.58 (3.17-4.26) 4.58 (.3.98.5.281) 5.31 (4.6+4-6 07) 6.26 (5.49-7.11) 4.19 (3..44-5 16) 4.66 (3,84-5.,67) 4.25 5.08 (3.6- 5.4 97) (4 19-6.11) 5,94 6.14 (4.53.5, 05) (5.09-7.28) 6,05 I 7.03 1,36 (1.03-1.83) 1.53 (1 39-2.46) 2.26 (1.72-1O5) 2.68 (2'.O7-3.8'1) 2.90 (2'.2:4.3, 88) 3.27 (2.55-4 32) 3.54 (2.84-4.72) 4.112 (3.16-5.15) 4.46 (3.53-5.62) 4.65 (3 70-5.83) 4.80 (3.83 5.99) 5.28 (4.24.6.52) 5.71 (4,60-6.98) 6.82 (5.52-8.22) 7.76 50 100 I 266 I 500 1,06 I 1.29 (0.7'34-1.51) (0.851-1.80) 1.55 1.8'9 (1,08-2.21) (1,25-2.77) 1.61 (1.17-2-23) r2.17 (1.58-3,01) 2.70 (1.97-3.7'8) 3.23 (.2:38-4 46) f 3.50 (2.6O-,4.81) 3.91 (2,92-5_31) 4.27 (3 21-a 70) 4.66 (3.53-x6.13) 5.10 (3.86.x}.60) 5.29 (4_05-6 . 81) 5.45 (4.18.6.98) 6.93 (4 58-7 50) 6.35 (4,92-7 97) 1,89 (1.3'1.2.70) 2.55 (1.77-3.64) 3.20 (2.22-X1.58) 3.85 (2.7'0-5.46) 4.19 (2.96-5 ,92) 4.65 (3.30-16.18) 4.98 (3.;6.16,63) 5.37 (3,87-7',27) 7,48 (5,84-9 20) 8.47 (5.25-6 94) (5:86-8.28) (6.32-9.2'9) (6►.65-10.4) 5.09 (4.50-54.74) 5.87 (5 19-5.63) 7.69 (6 24-8 02) 7.11 8.22 (6.2O-8 11) (8 88-9 81) 8,06 9.30 (7.04-9 15) (7 7'9-10 B) 9,04 9.82 (7.39-10 7) (7"_7'4-12.0) 10.5 11.1 (8 36-12 1) (6.74-13.4) 5.7'8 (4,20-771) 5.'98 (4.37-7.93) 6.14. (4.50-8 10) 6,60 (4.86.8.59) 7.00 (5.18.9.05) 8.15 (6.O8 -1O.4) 9.17 (+6.#8-11 6) 1000 1,48 (O.94O-2 18) 2.16 (1 38-3 19) 2.30 2.64 (1.52-3..38) (1.68.3.89) 3.11 3.57 (2,05.4 56 ) (2.27-5.26) 3.'94 4.56 (2.81 =5.'79) (2.90!-6-71) 4.77 I 5.54 (3.19-6 95) (3.56=8.08) 5.22 6.118 (3..51-7'.57) (3.934.81) 5«473 6.64 (3 89-8.21) (4.33.9.50 +x.09 61.84 (4 104,47) (4 51-9.71) 6.38 7.20 (4 40-6,89) (4.807-1x0."1) 6.74 n7.50 (4,68-9.25) (545-10.4) 6.95 7'.7'2 (41.86-9.48) (5,23-10.7) Ill 7.88 (4.99-9,65) (5.36.10.8) 7.50 8.21 (543O -1O.1) (5 63-11.2) , 7.87 8.53 (5.56.13.5) (5.69-11.6) 10.6 (7,98-13.3) 11.9 (8.97-14.8) 9.00 (6 45-11 8) 10.1 (7 24-13.1) 11.5 9.64 (6.72-12.9) 10.7 (7 52-14.3) 12.2 (8.34-14 9) (6 61-16 1) 12,8 13.5 (9.33-16.5) (9.60-17,6) Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS) Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval The probability- that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 534) Estimates at upper bounds are not checked against provable mexirnum precipitation (PM P) estimates and may be higher than curnantlyr valid PSI P values. Please refer to NOAA ,alas 14 document for more information. Back tp TP12 PF graphical 7 Q r' 111i1A K.1 c) A NA Precipitation Frequency Data Server https://hdsc.nws,noaa.govilidscipfds/pfds_printpage.htm no aa. govili dsclpfd s/pfds_pri ntpage. tart,1? Eat=40.3 l $ 9&... P'reci pitation depth i in ) 14 12 10 2 V Ig #ADS -based depth -duration -frequency (DDF) curves Latitude: 40.3189°, Longitude: -104 6011Q C 4C � kt5 or y -polar a a u �I •a N 4. ; • i Duration 4 >h >st >4 >it >t .C au ti so av mt; cti nil ni rte. c 4 r0 ftl (13 rw rn ier 5 10 25 50 100 200 500 1000 Average recurrence interval (years) NOAA Atlas 14o Volume Bo Version 2 Created (AMT): Sun Aug 2 12':19-13 2020 Back to Tpp Daps & Aerials Small scale terrain Average recurrence int erval iy►earrs 1 aer 1 2 5 10 25 50 100 200 BOO 1000 Duration 5-rrun 10 -run 15 -min 30 -min 2 -hr �-firr r 12 -hr 24 -hr a 2 -day 3 -day 4 -day 7 -day 20 -day 30 -day 45 -day 50 -days of 4 e 'recip iltat i on Frequency Data Server https ://hd sc. news. noaa. govihdscipfds/pfds.printpage. htm171at=40.3 18984... 3 km I ■• a t a ' a le,7 .Well rilt V1171. ' let az c�IM A tal s2A 12 'CCP ` 'e. Paki� a T.,. tip . ih *P., 2mi Large scale terrain pil L� .ExSTON VALE Er/1E% + QP09f Me �, _At 7g - ' 10 0km c I rn j Cheyenne _ Fort Collins relay LonQrnt Boulder -verif O FR OF 60mi r Large scale aerial Large scale reap ,} _a r q QMMilli% Ai 10 ANA Basin Imperviousness Ensign Weil Services - South Lot 24020 CR 49, Weld County} CO 7115/2020 BASIN RUNOFF - Southern Lot Land Use I rig Area Impervious Area, Grass . 114,595 0 Roofs - 90 Concrete Surfaces _ 90 Asphalt/Pavement - 10? Gravel, RNprap 279,762 40 Wghtd Avg & Total Area _ 394,357 28.4 cto I I a iv s —il.o g DI O us5 _ c I� 0 ei C!{ 2 co coFV co inifj 'a it 0� 8 0 • e f sf ND- is - 0 'd 6) 0I CA 47) . 0 0 0 O TT ++COI Yr 0 Q3 O n South Lot L so ci ist ,w A E ._ a :6: t 0 a. 8 0 a ..NJ z u- "ar iT S L O CL O Ls ?be 0 \0 i R CO CO o I lifi I a op yr e i Isis 6 in co eft •� , c ■... b. Cie C1/24 th .. O re ...4 - to - 0 ,.. . ,... ).. ,46 , es, d , , - 1 Is citi 0 c I . O No fa sira to tx up ce to 41 a To Y 0 i i r: 0 L 0 � ." CO a C C6 C6 CN us). in, OD C 00 CR C) it, CO lit 1- i II II II R w eivis .0 4F� a) _c a o W 0 03 0 , ca - I� Lti) o T5 a n Information Watershed Desi Q 1 C 0 L ■ 451 O n Information • St' 0 3 O 4 S CO 2 L z a- Ir a 0 0 T- ci 6 6 . II II II < < < > > '5 "Po ft o. a ,C .C 8 a) M 0 0 0 CD 0 CO CD 0 0 co a3 a) 75 Ili cv L L ea cu . c .c 0. a O 0 CO CV O O H 8/1 6/2020, 11:23 AM 0 x I 0 a� w 2 STAGE -STORAGE SIZING FOR DETENTION BASINS Project: Basin ID: Dia w' DesIon Inforrrkatlort finQut.t: Width of Basin Bottom, W =- Length of Basin Bottom, L Dam Side -slope (H:V), Zd _ Slane -Storage Relationship: �4 Siit arS i- ft ft Waft >L 1 Chen 8� Right Triangle Isosceles Triangle Rectangle Circle / El/apse I rregurar Storage Requirement from Sheet 'Modified FAA': Storage Requirement from Sheet'Hydrograph': Storage Requirement from Sheet 'Full -Spectrum': ?nape rip MINOR CSR._. OR._ OR.. OR. . (Use Overide values in cells G32:G52) MAJOR lacre-ft_ acre -ft acre -ft. ILabels for INOCY' Minor , 4 & Major Storage Stages li ncHt'l Water Surface Elevation ft Hint ini_in Side i Slope (H:V) fflft Below El Fusin 'width at Stage ft (cutout) 1 Basin I Length at Stage l't tuutDult � Surface Area at Stage ft2 (ou out I Surface Area at Stage ftz User Overide Volume Below Stage ft3 f r7+.itputl Surface Area at Stage acres lincrtpiil i 1 Volume Below Stage acre•ft �,i ncii if'i Target Volumes forWQUV, Minor, 8 Major Storage Volumes (far goal .Seek) 47g5,50 (Irv_it1 4 0.000 0.000 4796.00 0 00 0.00 2,040 510 0.047 0 012 4797.00 0.04 0.00 +4.200 1630 0.09 0.083 4707.E - _ 0.00 �_ 0,00 5,500 5.055 0.126 0.1111 WOCV MIA 4N/A #N1A Id NIA — #14IA { ; #NIA #NrilA 0 tiNIA MIA _ 4N/A - I #N/A #NIA #N/A #N/A - - - #N/A PIMA #NIA. 4N/A 4N/A I tON/A 4N/A tiNiA 4N/A 4NIA MIA 4N/A - C #N1A 4N/A - 4N/A #NIA 4N/A i 4N/A MA 4N/A - - #N/A #CIA MIA V MIA #NIA #NIA PNIA NM% tINIA y #N/A MIA � #N1A I. tiNIA - -- - - OW #N/A --- #NAA #NPA 4N/A 4NIA NN/A 4N/A _ IMWA 4N/A - - #NIA � � #N/A - 1 NWA 4N/A IONIA 4N/A - - 4N/A p - MIA 4N/A 414/A #NIA - NN/A #NIA #NIA MIA #NIA MIA #NIA ! 4N/A 4N/A ItN#A, - ErtsignUD-Detention South.xls, Basin 8/16/202D, 3:13 PM 7 N �S W fr CO O 3 N !! _ T if ra5 = I H = (69/3.1'24 .SE SE OCT .,t co Ll. tU 0 CO 0 "0 ay f.13 ger No is 1-3 0 is) n 13 31 K13 a CO .es75 Hydrologic Soi .P*A $ SE QV QT fn r, Ot036fr 01- 060E917V 06603177 (186294# 096ZStit ti M. Y N\ a r tr- ._ t 03720;t7t7 40° it 56" N �o S Nn ZS SE ¢trIE MapScale: 1:1,450 if printed on A landscape (ill x $.5") sheet. Q M .2 .9E alTDE 8 4 o C - LO ro aaj CO 1Z t CL -0 4 C O 0 69 .> Qt Q ti O C Cb IS (i4 Ca 0 Z co 0_ Go 0- v O- M 14 V co o Nte o 7, o LU CO 0 2 MAP INFORMATION MAP LEGEND were mapped at {�1 '45 e] id, a � c a 2co 11 r q co ``5 ez 0 �P E C u a) a m 48 C E (?) 2 m CJ1 - O o C or) ti u .c 41.2 0 .0 it > 4 ' _ C � ID 0 Q� TI* .u". 8 CI* Y T .� ell (1) rya p E . , E ,C C � to c c g {A A C� 3 0 Not rated or riot available ❑ Q O o Area of interest (AOI) Area of Interest (AO') LID Sail Rating Polygons Water Features a m m 0 Streams and Canals Transportation CO D Interstate Highways L re To 1.5 rt Z D E � m C13 61) v) +) g 00 12 X5.0 LIS Routes Major Roads Web Mercator (EPSG:3$57) 1.1 Zi co .c m 3 5 O z 2 co C � 0 al L', C = 0 [J� .41) O CD 0_ Cli Cin CD m • E 0u c E f4 o 4 hou a` 4)CO di 2 C13 IJUll 2 at < Local Roads • E co 03 Rating Lines 0 CL L a_ .2 m [Ci IP .10 CC ice 09 L � Q 0) W c a- m � C €r Q cin 1:3 "- o ig La a) c`ra L I - a m 0 U 0 LW 0_ G 4 N L2 (NI o Ir1 C C G' r o c �> ra CC cc �n (13 o r co CL fQ Cti co ect as En as '4 is ho OE CI ro o Go T Jul 19, 2018 —Aug or not available 3 12 CD ` C • Q co N n o � 1" E m cow -° -0 w o w f0 ui E co ib a) � _c:i • a� `cL� 0 45 NO ` == .C 0 ,� Q� C t f c co a co - E E 0 'a. nia-Lb- et) `IE c E r G? 00 i O El fa O it • 0 CN1 r cr) r-- fo }>, L CJ��} icu co rrn�n V0 s o CO W di 4 _° 0 c) +E e o c m ix co a4 z c 05 0 z Hydrologic Soil Group —Weld County, Colorado, Southern Part Ensign - South Lot (CFA 49/46) Hydrologic Soil Group Map unit symbol Maps unit name Rating Aor3s in Aol F Percent, of AOt 47 Olney fine sandy loam, B 1 to 3 percent slopes 72 Vona loamy sand, 0 to 3 IA percent slopes Totals for Area of interest Description i 2.2 7.0 9.1 Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet} and receive precipitation from long -duration storms. The soils in the United States are assigned to four groups (A, B, D, and D) and three dual classes (AID, B/D, and /D). The groups are defined as follows: Group A. Soils having a high infiltration rate ( low runoff potential) when thoroughly wet. These consist mainly of deep, well drawled to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group D. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texku re. These soils have a slow rate of mater transmission. Group D. Soils having a very slow infiltration rate ( high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential! soils that have a high water table, soils that have a claypa n or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, BID, or SID), the first letter is for drained areas and the second is for u nd ra ined areas. Only the soils that in their natural condition are in group D are assigned to dual classes: Rating options AggregationMethod: Dominant Condition 23fr9 a 76.1% 100.0% usim Natural Resources Web Soil Survey a Conservation Service Nationai Cooperative Soil Survey 7/14/2020 Page 3 of Hydrologic Soil Group -Weld County, Colorado, Southern Part Ensign - South Lot (CR 49146) Component Percent Cutoff None Specified Tie -break Rule: Higher tesDA Natural Resources INeb Soli Surrey Canaenraiian Service National Cooperative Soil Surrey 7/14/2020 Page 4 of 4 07 104°36'231'W X40°1512.2"N f- It z Q 0 w CO cr d Q a CcC a W c 0 .0 a d W at a, ❑ nto 0 z m' >: a.0 LL CO ¢ alc� W J W LIJ 2 LL H 00Cr W Lei w +n Regulatory Floodway O Is. 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E o `a a m r� �lo� ti E a�at a,00 � � g re ) 1"1. 2 a .-- c •- d! � 0,7 tinK Cr .LLlall :f ela ~- ..0-cooiIG 'C lk-iu1 .c �l7 i C O C� a � = � d �Ir 'p t0 4 01 J rI '0 2 E 2 Ci 0sti m. c r� � � togs. 4s � 0 c oro� m RJ "1.i E Ili a,� Q 0 4..3 w C Af [0 ifl _ 113 8 t11 t7# NEAP PANELS in wl 0 ,. County Boundary LB LANDMARK BUILDERS INC, DUST ABATEMENT PLAN PARCEL 1053-18-2-00-011 1. Unpaved roads will be watered for dust control. 2. On -site vehicle speeds will be restricted to reduce amount of generated dust. 3. Stockpiling of materials and equipment will be performed to minimize drop distance and control potential dust problems 4. Weeds on the property will not be allowed to grove over 12 inches high. Hello