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Home My WebLink About20102268.tiff Esther Gesick ooram: Kim Ogle nt: Tuesday, September 28, 2010 8:37 AM : Esther Gesick Subject: FW: Schnuerle Attachments: Memo to Applicant.pdf; WaterQualityFeature.pdf Please add to file Thank you From: Heidi Hansen Sent: Monday, September 27, 2010 10:51 AM To:julie.cozad@tetratech.com Cc: Kim Ogle Subject: Schnuerle Julie, Here are the Water Quality calculations for Mr. and Mrs. Schnuerle's property along with a description of what we are looking for. Please let me know if you have any questions. Thank you, Heidi IIP:idi Hansen, P.E. eld County Public Works 1111 H Street Greeley, CO 80631 970.304.6496 ext. 3745 • 1 • MEMORANDUM W�`��• TO: Charles and Gail Schnuerle DATE: September 27, 2010 FROM: Heidi Hansen, P.E., Public Works Department COLORADO SUBJECT:AmUSR-1218 Water Quality Requirements Dear Mr. and Mrs. Schnuerle, At the Planning Commission Hearing on September 7, 2010 your representative indicated that a water quality feature would be provided for your project. I completed the calculations to size your water quality feature and they are attached. The water quality feature is essentially a 1 foot deep depression that will catch stormwater runoff from your property. An existing onsite grassy low point can be used or you can dig a shallow depression along the southern end of your RV parking area. The storage volume required for your site is around 1,000 cubic feet. Your depression should meet this volume. You should size your depression to fit your site. You could use a long, skinny, 1 foot deep depression that is 10X100 feet or you could use a 1 foot deep depression that is 20X50 feet. If you would prefer to use a 2 foot deep depression, your area could be 10X50 feet. You may also show an existing low grassy area on your site. When you have decided what area to use for your water quality depression you will need to show an outline for it on your •plat and label it as"Water Quality, No Build/Storage Area". Weld County Code (Sec 8-11-30, Chapter 1, #17) states that, "No stormwater detention shall be required for redevelopment of commercial and industrial sites where the change of use does not increase the imperviousness of the site; however,water quality capture shall be required." This is the stormwater criteria you fall under because your building is in the footprint of an existing structure and you will not be paving or graveling further so you are not increasing the site imperviousness but water quality is still required by the Code. Please contact me if you have any questions. Sincerely, Heidi Heidi Hansen, P.E. Weld County Public Works 1111 H Street Greeley, CO 80631 970.304.6496 ext. 3745 hhansenaco.weld.co.us • Page 1 of Water Quality Feature Calculation • Surface Area (SF) Area(acres) %Impervious i Roof 9,400 0.22 100% 1 Paved 5,000 0.11 100% 1 Gravel/Crushed Asphalt 15,000 0.34 40% 0.4 Grass/Dirt 2.15 2% 0.02 Total Site 2.82 Weighted Imperviousness(i)= 0.181 WQCV=x'(0.91 r 3-1.19r 2+0.78x) 6-hr drain time a=0.7 12-hr drain time a =0.8 24-hr drain time a =0.9 40-hr drain time a = 1.0 WQCV= 0.1077 rwOCYl Required storage =I 12 (Area) • Required storage= 0.0253 acre"feet 1,103 cu ft • Esther Gesick Orom: Kim Ogle ent: Tuesday, September 28, 2010 12:02 PM o: Esther Gesick Subject: FW: Schnuerle Attachments: WQ Area-To Be Grassed.jpg Please add this to file, also. Thank you. Kim From: Heidi Hansen Sent: Tuesday, September 28, 2010 11:39 AM To: Cozad, Julie Cc: Kim Ogle Subject: RE: Schnuerle Julie, I stopped by the Schnuerle property this morning and although they were not available, a construction worker showed me the low area where flows travel to. Right now the area is all dirt so it would not qualify as water quality but I was told that they are planning to seed it after the construction is finished. If the area is vegetated with grass then it would certainly qualify as a water quality area. They should take care to keep that area as a low point when grading nearby so that the site continues to flow that •rection. I've attached a photo of the area. On the final plat they will need to show the area as "Water Quality, No Build/Storage Area". The depth is quite shallow so if we estimate that it is 6" deep then their area outline will need to cover approximately 40X50 feet which it appears should easily fit into the future grassy area. If you have any additional questions or concerns please let me know. Thanks, Heidi Heidi Hansen, P.E. Weld County Public Works 1111 H Street Greeley, CO 80631 970.304.6496 ext. 3745 From: Cozad, Julie [mailto:Julie.Cozad@tetratech.com] �ent: Monday, September 27, 2010 11:37 AM r : Heidi Hansen Subject: RE: Schnuerle M a . 1 Let me give the Schnuerle's a call and see if they will be around this afternoon. How late in the afternoon would you be available? illtlie Cozad I Land Planning Manager irect: 720.864.4564 I Office: 303.772.5282 I Fax: 303.772.7039 I Cell: 303.709.3319 julie.cozad@ tetratech.com Tetra Tech, Inc. I Engineering and Architecture Services 1900 S. Sunset Street,Suite 1-F I Lon,gmout, CC) SUSU1 j www.tetratech.com PLEASE NOTE: This message, including any attachments, may include privileged, confidential and/or inside information. Any distribution or use of this communication by anyone other than the intended recipient is strictly prohibited and may be unlawful. If you are not the intended recipient, please notify the sender by replying to this message and then delete it from your system. From: Heidi Hansen [mailto:hhansen@co.weld.co.us] Sent: Monday, September 27, 2010 11:01 AM To: Cozad,Julie Subject: RE: Schnuerle Julie, I can meet you on site this afternoon if you would like. I don't think an engineer is required. If they have an existing onsite sump area then we will accept that. Many times people will just provide a photo of the low area for our file but if you would like for me to come and take a look then I would be happy to. Thanks, •eidi Heidi Hansen, P.E. Weld County Public Works 1111 H Street Greeley, CO 80631 970.304.6496 ext. 3745 From: Cozad,Julie [mailto:Julie.Cozad@tetratech.com] Sent: Monday, September 27, 2010 10:55 AM To: Heidi Hansen Subject: RE: Schnuerle Heidi, Thanks for sending this. Would you be able to meet on site to see if there is an area that may already meet this criteria? Chuck thinks that there is. Should one of our Engineers come along too? I could meet with you later this afternoon if that works for your schedule. Otherwise, we can meet after the hearing. Let me know. Thanks,Julie Illlie Cozad I Land Planning Manager irect: 720.864.4564 I Office: 303.772.5282 I Fax: 303.772.7039 I Cell: 303.709.3319 julie.cozad@tetratech.com 2 Tetra Tech, Inc. I Engineering and Architecture Services 1900 S. Sunset Street,Suite 1-F I Longmont, CO xOso7 www.tetratech.com �LEASE NOTE: This message, including any attachments, may include privileged, confidential and/or inside information. ny distribution or use of this communication by anyone other than the intended recipient is strictly prohibited and may be unlawful. If you are not the intended recipient, please notify the sender by replying to this message and then delete it from your system. From: Heidi Hansen [mailto:hhansen@co.weld.co.us] Sent: Monday, September 27, 2010 10:51 AM To:Cozad,Julie Cc: Kim Ogle Subject:Schnuerle Julie, Here are the Water Quality calculations for Mr. and Mrs.Schnuerle's property along with a description of what we are looking for. Please let me know if you have any questions. Thank you, Heidi Heidi Hansen, P.E. Weld County Public Works 1111 H Street Greeley, CO 80631 i*0.304.6496 ext. 3745 • 3 1 r Q • se.• h • •� . ` - • ... ' ► : • t • • -' 1 • - -• • kg/Wit le .. •1 • j1-,• 1 'L ; oC e, , . .•.. a•.4 • = ' ' ifts• '-411•9_ - ` • rNc y•, .1• '- `ii I•• - • •-r " I a ' • ;hl t - �.. fi /. i .. • ..r • . „.• .• „ irtif,, , •;!-� ` ..c -....., j. mic: - „. _ . . .• ` <• .• lit •s ! C , e . ...wt. ...." . . I i �+• t\y, • ' - is • : o �. WI . •.tie.; ., Ig' A . , . t •V tit �� , ' • \ . . }, ' � , \P -% tit••- . • • 4• 1• / Lie - ••:..- 1 ' - , • 6, I 6. • 0 I' .• • `' - `ter d• • ... 2.T� •?.•• MN.. 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Cr 1 sa • esolutio ondltfons and Development Standards • P_bb! ;v4ic''i5: w"Ie% K1'= eje t cepcess narea • r G..i DCr`9'ir "fin: t'f e. 'L P -an Sept,C S}starrl appro\cc • PlarAnmg CGnentco s met revisianst oaf as reqi,ire • Debs•Cprnent$13nG3rd5.$i ggested tr and • . C?3rg# :fe.mtity63t*o4 • :•• L,,;�r'.. .R. , '' res-0=-77 IC c.•!ci 1 L,IP serlennt Summary • 1 ci FILE CONTAINS OVERSIZED PLAT MAP WITH STAFF NOTES SEE ORIGINAL IN FILE Hello