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Home My WebLink About880351.tiff- .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. RESOLUTION RE: APPROVE ACTION OF BOARD OF COUNTY COMMISSIONERS OF WELD COUNTY, COLORADO, CONCERNING SITE APPLICATION OF THE CITY OF NORTHGLENN AND AUTHORIZE CHAIRMAN TO SIGN WHEREAS, the Board of County Commissioners of Weld County, Colorado, pursuant to Colorado statute and the Weld County Home Rule Charter, is vested with the authority of administering the affairs of Weld County, Colorado, and WHEREAS, the City of Northglenn wishes to expand the current capacity of a wastewater treatment facility on the following described parcel of land, to-wit: Part of Section 36 , Township 1 North, Range 68 West of the 6th P.M. , Weld County, Colorado WHEREAS , the Regulations for Site Applications for Wastewater Treatment Facilities require review of the Site Application by the Board of County Commissioners and, further, that various local and State agencies be given the opportunity to review and comment on said Site Application, and WHEREAS, the City of Northglenn has submitted its Site Application to the Board of County Commissioners of Weld County for review and comments, a copy of said Application being attached hereto and incorporated herein by reference, and WHEREAS, after study and review, the Board finds that said Site Application is compatible with the Weld County Comprehensive Plan and that it is in the best interest of Weld County to recommend approval of said Application. NOW, THEREFORE, BE IT RESOLVED by the Board of County Commissioners of Weld County, Colorado, that the Site Application of the City of Northglenn be, and hereby is, recommended favorably to the Colorado Department of Health as being compatible with the Weld County Comprehensive Plan. BE IT FURTHER RESOLVED by the Board that the Chairman be, and hereby is , authorized to sign said Site Application. PL0079 880351 Page 2 RE: SITE APPLICATION - CITY OF NORTHGLENN The above and foregoing Resolution was , on motion duly made and seconded, adopted by the following vote on the 11th day of May, A.D. , 1988 . .eaut � n/ BOARD OF COUNTY COMMISSIONERS kma � ATTEST: i/LAI WELD COUNTY, COLORADO Weld County Jerk and Recorder '4 t, /K and Clerk to the Board ene R. Bran n�Chairman BY: •/' < )J4-lime ( c< 4.- C. . Kirby, Pr -Tem Deputy Coun₹y. Clerk EXCUSED APPROVED AS TO FORM: Jacque ' ohnson Go ri �i i , ,/- "e® County Attorney „- �_l Frank Yamaguchi 880351 BEFORE THE WELD COUNTY, COLORADO, PLANNING COMMISSION RESOLUTION OF RECOMMENDATION TO THE BOARD OF COUNTY COMMISSIONERS Moved by Paulette Weaver that the following resolution be introduced for passage by the Weld County Planning Commission. Be it Resolved by the Weld County Planning Commission that the application for: NAME: City of Northglenn ADDRESS: 11701 Community Center Drive, Northglenn, CO 80233 REQUEST: Site approval for capacity expansion of a waste water treatment facility (to re—rate the wastewater treatment facility from 4.64 million gallons per day to 6.5 million gallons per day capacity of a wastewater treatment facility) . LEGAL DESCRIPTION: Part of Section 36, TIN, R68W of the 6th P.M. , Weld County, Colorado LOCATION: North of Weld County Road 2 and west of Weld County Road 11 be recommended favorably to the Board of County Commissioners for the following reasons: This request is consistent with the I-25 mixed-use development area and activity center goals and policies set forth in the Weld County Comprehensive Plan. The proposed expansion of the wastewater treatment facility will allow efficient and cost-effective delivery of public sewer service to the activity center located at I-25 and State Highway 7. The proposed expansion is not located in the flood plain, it does have the capacity to serve the proposed service area, and it does not appear to have an adverse affect on water quality of the area. This proposed expansion will not be a duplication of public services and it does not appear to have any adverse impacts on the general health, safety and welfare of the present and future residents of Weld County. The Weld County Health Department, Weld County Engineering Department, and the North Front Range Water Quality Association have reviewed this request and have set forth no objections. Motion seconded by LeAnn Reid. VOTE: For Passage Against Passage LeAnn Reid Bud Halldorson Ernie Ross Louis Rademacher Paulette Weaver Ann Garrison 880351 r City of Northglenn May 3, 1988 Page 2 The Chairman declared the resolution passed and ordered that a certified copy be forwarded with the file of this case to the Board of County Commissioners for further proceedings. CERTIFICATION OF COPY I, Bobbie Good, Recording Secretary of the Weld County Planning Commission, do hereby certify that the above and foregoing Resolution is a true copy of the Resolution of the Planning Commission of Weld County, Colorado, adopted on May 3, 1988, and recorded in Book No. XI of the proceedings of the said Planning Commission. Dated the 3rd day of May, 1988. Bobbie Good Secretary 880351 Summary of the Weld county Planning Commission Meeting Nay 3, 1988 Page 2 MOTION: LeAnn Reid moved the request of Weld County School District RE-3J for approval of a Site Development Plan for an expansion of a public school facility be forwarded to the Board of County Commissioners with the Planning Commission's recommendation for approval based upon the recommendation of the Department of Planning Services' staff and the testimony of the applicant. Motion seconded by Paulette Weaver. The Chairman called for discussion from the members of the Planning Commission. Discussion followed. The Chairman asked the secretary to poll the members of the Planning Commission for their decision. LeAnn Reid - yes; Bud Halldorson - yes; Ernie Ross - yes; Louis Rademacher - yes; Paulette Weaver - yes; Ann Garrison - yes. Motion carried unanimously. CASE NUMBER: None APPLICANT: City of Northglenn REQUEST: Site Approval for the expansion of capacity of a wastewater treatment facility (to rerate the wastewater treatment facility capacity from 4.64 million gallons per day to 6.5 million gallons per day) LEGAL DESCRIPTION: Part of Section 36, TIN, R68W of the 6th P.M., Weld County, Colorado LOCATION: North of Weld County Road 2 and east of Weld County Road 11 APPEARANCE: Kip Scott, Laboratory Supervisor, City of Northglenn, reported they have room for enough physical expansion within the plant that they do not need to build any additional facilities to rerate the wastewater treatment facility. Rod Allsion stated this request is considered a minor change to their existing Use by Special Review Permit. The Chairman called for discussion from the members of the audience. There was none. MOTION: Paulette Weaver moved the City of Northglenn's request for expansion of capacity of a wastewater treatment facility to rerate the existing wastewater treatment facility capacity from 4.64 million gallons per day to 6.5 million gallons per day be forwarded the to Board of County Commissioners with the Planning Commission's recommendation for approval based upon the recommendation of the Department of Planning Services staff and the testimony of the applicant. Motion seconded by LeAnn Reid. 880351 Summary of the Weld county Planning Commission Meeting May 3, 1988 Page 3 The Chairman called for discussion from the members of the Planning Commission. Discussion followed. The Chairman asked the secretary to poll the members of the Planning Commission for their decision. LeAnn Reid - yes; Bud Halldorson - yes; Ernie Ross - yes; Louis Rademacher - yes; Paulette Weaver - yes; Ann Garrison - yes. Motion carried unanimously. CASE NUMBER: Amend USR-673 APPLICANT: Catherine W. Cariaso REOUEST: Approval of a Site Specific Development Plan and an amendment to a Special Review permit to include a dog kennel (maximum of 16 dogs) LEGAL DESCRIPTION: Part of the NE} of Section 6, T4N, R68W of the 6th P.M. , Weld County, Colorado LOCATION: South of State Highway 60 and west of Weld County Road 3 APPEARANCE: Catherine W. Cariaso, property owner and applicant, stated this is a request for an amendment to her existing Use by Special Review permit for a pottery business to include a kennel. Seven of her ten existing dogs have been debarked. At no time should there be any more dogs on the property than she is requesting. Breeding Golden Labradors is a hobby and not a business. She also reviewed arrangements she has made for the animals care when she must be away from home. The Chairman called for discussion from the members of the audience. Ruth Schrage, adjacent property owner, spoke against this request because of possible increased traffic, noise, and odor. Theodore Schrage, surrounding property owner, submitted letters for Clyde Sievers, surrounding property owner and resident of Silt, Colorado (Exhibit 16) , and Dean Hanes, surrounding property owner, (Exhibit 17) in opposition to this request. Mr. Schrage also spoke in opposition of this request because it is not compatible with surrounding land uses. Millissa Culver, D.V.M. , Allard Animal Hospital, Loveland, Colorado, spoke in support of this request . Ann Holman, surrounding property owner, spoke in support of this request. Tape 320 — Side i The Chairman asked Ms . Cariaso if she had reviewed the recommendation, conditions, and Development Standards presented by the Department of Planning Services' staff? She stated she has, and agrees to conform to of them. 880351 Date: May 3, 1988 NAME: City of Northglenn ADDRESS: 11701 Community Center Drive, Northglenn, CO 80233 REQUEST: Site approval for capacity expansion of a waste water treatment facility (to re-rate the wastewater treatment facility from 4.64 million gallons per day to 6.5 million gallons per day capacity of a wastewater treatment facility) . LEGAL DESCRIPTION: Part of Section 36, TIN, R68W of the 6th P.M., Weld County, Colorado LOCATION: North of Weld County Road 2 and west of Weld County Road 11 THE DEPARTMENT OF PLANNING SERVICES' STAFF RECOMMENDS THAT THIS REQUEST BE APPROVED FOR THE FOLLOWING REASONS: This request is consistent with the I-25 mixed—use development area and activity center goals and policies set forth in the Weld County Comprehensive Plan. The proposed expansion of the wastewater treatment facility will allow efficient and cost—effective delivery of public sewer service to the activity center located at I-25 and State Highway 7. The proposed expansion is not located in the flood plain, it does have the capacity to serve the proposed service area, and it does not appear to have an adverse affect on water quality of the area. This proposed expansion will not be a duplication of public services and it does not appear to have any adverse impacts on the general health, safety and welfare of the present and future residents of Weld County. The Weld County Health Department, Weld County Engineering Department, and the North Front Range Water Quality Association have reviewed this request and have set forth no objections. 880351 LAND-USE APPLICATION SUMMARY SHEET Date: April 26, 1988 NAME: City of Northglenn ADDRESS: 11701 Community Center Drive, Northglenn, CO 80233 REQUEST: Site approval for the expansion of capacity of a wastewater treatment facility (to re—rate the wastewater treatment facility . - capacity from 4.64 million gallon per day to 6.5 million gallon per day.) LEGAL DESCRIPTION: Part of Section 36, TIN, R68W of the 6th P.M., Weld County, Colorado LOCATION: North of Weld County Road 2 and east of Weld County Road 11 SIZE OF PARCEL: Approximately 320 acres POSSIBLE ISSUES SUMMARIZED FROM APPLICATION MATERIALS: The Colorado Department of Health, Water Quality Control Commission's regulations require that the applicant submit the site application to all appropriate local governments, planning agencies, and state agencies for review and comment prior to submission to the Colorado Department of Health's District Engineer. The regulations further state that if the proposed expansion is located in the unincorporated area of a county, the county planning agency should be requested to comment upon the relationship of the treatment works to the local long—range comprehensive plan and any other plans for the area, including the 208 Water Quality Management Plan. The Weld County Health Department, Weld County Engineering Department, and the North Front Range Water Quality Association have reviewed this request and have not expressed any objections. 88€ 351 REFERRAL LIST APPLICANT: City of Northglenn SENT REFERRALS OUT: April 4, 1988 REFERRALS TO BE RECEIVED BY: April 18, 1988 NO SR NR NO SR NR County Attorney at µ-;14 v+ss y-4o 4'/ X Weld County Health Dept. frs X Engineering Department County Extension Agent _ Office of Emergency Mngmt Ed Earring X North Front Range Water Quality Association Civic Center 500 East Third Street Loveland, CO 80537 State Highway Department P.O. Box 850 Greeley, CO 80632 _ Colorado Department of Health Water Quality Control Division 4210 East 11th Avenue Denver, CO 80220 City of Greeley Planning Department 1000 10th Street Greeley, CO 80631 Tri Area Planning Commission P.O. Box 363 Frederick, CO 80530 NO=No Objection SR=Specific Recommendations NR=No Response 880351 0; t .(0.; iTii):J : O2 n •turii *-11* i, 4734 Jo To Keith Schuett, Current Planner,. April 21, 1988 COLORADO From Wes Potter, Health Protection Services o'4 { ,A. City of Northglenn site approval subject of t1� The Division has reviewed the site application and find no significant negative environmental impact. The major impact to Weld County will be an increase of the discharge to Bull Canal or Big Dry Creek, and the permit restrictions appear to be sufficient to maintain consistent water quality in the canal. The facility will be providing service to a small area in Weld County which we find desirable. L9 1 1988 id keltt Cu. Amiikurk Unqudt kur 880351 tv, aiv dam- l ( DEPARTN._ AT OF PLANNING SERVICES II %Sy PHONE(303)356-4000 EXT. 4400 915 10th STREET I Y - GREELEY, COLORADO 80631 i A s®,. CASE NUMBER None COLORADO April 4, 1988 TO WHOM IT MAY CONCERN: Enclosed is an application from the City of Northglenn for approval of a Site Application to re-rate the waste water treatment facility capacity from 4.64 M.G.D. to 6.5 M.G.D. The parcel of land is described as part of Section 36, TIN, R68W of the 6th P.M. , Weld County, Colorado. This application is submitted to your office for review and recommendations. Any comments or recommendations you consider relevant to this request would be appreciated. Your prompt reply will help to facilitate the processing of the proposal and will ensure prompt consideration of your recommendations. Please reply by April 18, 198E, so that we may give full consideration to your recommendation. Please call Keith A. Schuett, Current Plannr, if you have any questions about this referral. Thank you for your help and cooperation in this matter. Check the appropriate boxes below and return to our address listed above. 1. We have reviewed this request and find that the request (does/does not) comply with our Comprehensive Plan for the following reasons. C o� oi 2. We do not have a Comprehensive Plan, but we feel this request (is/is not) compatible with the interests of our town for the following reasons: F _ co 3 OO 3. We have reviewed the proposal and find no conflicts with our interests . O 4. A formal recommendation is under consideration and will be submitted to you prior to: 5. Pease refer to the enclosed letter. Signed: ._,. , ��• �5 _ e Agency: L.�� ,�n r_<-' <— , , Date: 4-- -(n 880351, DEPARTM_:JT OF PLANNING SERVICES (` PHONE(303)356.4000 EXT. 4400 915 10th STREET AA 1 GREELEY,COLORADO 80631 ;. ! , t " • CASE NUMBER None COLORADO April 4, 1988 TO WHOM IT MAY CONCERN: Enclosed is an application from the City of Northglenn for approval of a Site Application to re—rate the waste water treatment facility capacity from 4.64 M.G.D. to 6.5 M.G.D. The parcel of land is described as part of Section 36, TIN, R68W of the 6th P.M. , Weld County, Colorado. This application is submitted to your office for review and recommendations. Any comments or recommendations you consider relevant to this request would be appreciated. Your prompt reply will help to facilitate the processing of the proposal and will ensure prompt consideration of your recommendations. Please reply by April 18, 198E, so that we may give full consideration to your recommendation. Please call Keith A. Schuett, Current Plannr, if you have any questions about this referral. Thank you for your help and cooperation in this matter. Check the appropriate boxes below and return to our address listed above. 1 . We have reviewed this request and find that the request (does/does not) comply with our Comprehensive Plan for the following reasons. or- g �., n j 2. We do not have a Comprehensive Plan, but we feel this request a (is%is not) compatible with the interests of our � town for the following reasons: S"1 CID 3. J/ We have reviewed the proposal and find no conflicts with our co ` interests . l=J 4. A formal recommendation is under consideration and will be submitted to you prior to: 5. Please refer to the enclosed letter. 77 Signed: �� c-z��z Agency: v . Date: �/ �i / : g 880351 4111116 11701 Community Center Drive Northglenn,Colorado 80233 Phone(303)451-8326 arch 30, 1988 Mr. Rod Allison Weld County Planning Department 915 Tenth Street, Room 342 Greeley, Colorado 80631 Gentlemen, Enclosed is a Site Application for the City of Northglenn. We are submitting this for your signature as per Colorado Department of Health Regulations. The City of Northglenn is requesting that its Wastewater Treatment Facility be re-rated from 4.64 MGD to 6. 5 MGD. We have performed an operational evaluation of the facility and concluded that we can increase capacity without any adverse impacts upon our discharge limits. The additional capacity will be utilized in the future to serve areas in Adams County that are as yet undeveloped. Currently the Denver Regional Council of Governments (DRCOG) is conducting a study of the Lower South Platte Basin (LSP) . The LSP subcommittee has identified that additional treatment capacity will be needed in the Big Dry Creek drainage basin. The City of Northglenn could provide this capacity. The additional capacity would also be used to provide service to the Activity Center located at the intersection of Interstate 25 and Highway 7 , which is in Weld County. This request involves no construction or change in discharge limitations. Only minor impacts to operation and maintenance are envisioned due to higher flows. There are no new or increased environmental impacts projected from this re-rating. A copy of the Engineering report, 1987 monitoring results, a 5 mile radius map and a 1 mile radius map are enclosed. A copy of the Site Application is enclosed. Please sign and return the Site Application to the address above. To facilitate tracking of this application, please notify me if this application cannot be returned within fourteen days. Sincerely, /07,x- /444 �O�,-ti�-- Tom Ambalam, P.E. Director of Natural Resources TA/mr 80351 Enclosures • CO=ADO ADO DEPARTMENT OF HEALTH Water Quality Control Division 421.0 East 11111 Avenue . Denver, Colorado 80220 • APPLICATTON FOR ST'i'E APPROVAL FOR CONSTRUCTION OR i,MIAISiOU I : A) DOMESTIC WASTEWATER TREATMENT WORKS (INCLUDING TREATMENT PLANTS, OUTFALL SEWERS, AND LIFT STATIONS) OVER 2,000 C1?'D CAPACITY. ' B) INTERCEPTORS (IF REQUIRED BY C.R.S. 25-8-702 (3)) APPLICANT: City of Northglenn ADDRESS: 11701 Community Center Drive `2110ir'E: 451-8326__ Consulting Engineer's Name and Address:James M. Montgomery, Consulting Eng,_, Inc . 12200 East Iliff Avenue , Aurora, CO. 80014 _:PIJONE:695_4 flan ^_ Jim Reynolds , Project Engineer A. Strmw:ir-y of information regarding new sewage treatment plant: 1. Proposed Location: (Legal Description) 1/4, Wititt ill, (-L L' :1. Township 1N Weld County. 2. Type and capacity of treatment facility proposed: Processes Used Aerated Lagoon Hydraulic 13 . 1 /MGD Organic 12 468 based on 6. 5 MGD, 230 mg/1 130D gal/day lbsa IlUl:5/day • Present PE 31287 Design PE 65000 , Doutesticj_QQL._,_. 2; ludustrlal n% 3. Location of facility: Attach a map of the area which includes the following: (a) 5-mile radius: all sewage treatment plants, lift stations, and domestic water supply intakes. (L) 1--mile radius: habitable buildings, location of potable water wells, and an approximate indication of the topography. 4. Effluent disposal: Surface discharge to watercourseBull Canal or Big Dry Creek Subsurface disposal - None Land Sludge. Evaporation • NA Other NA State water quality classification of receiving watercourses)Unclassified/Aripst.irwwT1 Proposed Effluent Limitations developed in conjunction with Planning and Standards Section, WQCD: L'OD5 30 mb/1 SS 30 mg/1 Fccal Conform 2000 /100 ml Total Residual Chlorine NA mg/1 Ammonia NA mg/1 Other -- 5. Will a State or Federal grant be sought to finance any portion of this project? No G. Present zoning of site area? Site of current Wastewater Plant Zoning with a 1-mile radius of site?Commercial, Agruicultural, Residential 7. What is the distance downstream from the discharge to the nearest duuicst3.c water supply intake? No domestic supplies on Bull Canal Ii•uute of Supply) No domestic supplies on Big Dry before confluence with South Platte ( 15m1i _-- . (Address of Supply) What 1s the distance downstream fLolu the discharge LLB the ucarest O-H Aer point of diversion? Approx. 7 mi . City of Dacono Irrigation Susnly —_- �� Jiame 01 User) 512 Cherry Street , P.O. Box 186., Dacono , Co . B0514 (Address of User) -1- 880351 i•,QCD-•3 (Revised 0-83) 8. Who has the responsibility for operuili,r, t:.o proposed fa��.Llit. ? City of Northglenn 9. Who owns the land upon which the facility will be constructed:? City of Northglenn (Please attach copies of the document creating authority in the applicant to construct the proposed facility at tub site.) 10. Estimated project cost: No cost Who is financially responsible for the construction and operation of the facility? City of Northglenn II. Flames and addresses of all water and/or sanitation districts within S miles downstream of proposed wastewater treatment facility site. Sheet attached. —_ (Attach a separate s b v paper if necessary.) 12. Is the facility in a 100 year flood plain or other natural hazard area? No If so, what precautions are being taken? NA has the flood plain been designated by the Colorado Water Conservation Board, Department of Natural. Resources or other Agency? (Agency Name) if so, what is that designation? NA _ M_ 13. !'lease include all additional factors that might help the Water Quality Control Division make an informed decision on your application for site approval. Additional treatmant capacity of 1 .86 MGD is realized by optimi78tinn of original design process . There TAl), bq rip physi na7 nQnstruction required . This application is to thane the plant capacity ks iistPd in the current NPDES permit from 4.64 MGD to 6. 5 MGD. The facility has been operated for over a year utilizing only 50% of the treatment capacity at an average flow of 3 . 5 MGD. No changes have been seen in effluent water quality. B. ininrmaiton regarding lift stations: 1. 1'he proposed lift station when fully developed will generate the Luliorl►.L; additi.on,t load: Peak Hydraulic (3.101)) P.E. to be served 2. Is the site located in a 100 year flood plain? if yes, on a separate sheet of paper describe the protective measures to be taken. 3. Describe emergency system in case of station and/or power failure. 6. Name and address of facility providing treatment: 5. The proposed lift station when fully developed will increase the loading of tlic treatment plant to % of hydraulic and % of organic capacity and agrees to treat this wastewater? Yes No (Treatment Agency) Date Signature ad Tl L1e 2_. t:�2ci}-3 (revL::c4 8-L3) 880351 C. If the facility will be located on or adjacent to a site that is owned or managed by a Federal or State agency, send the agency a copy of this application. D. Recommendation of governmental authorities: Please address the following issues in your recommendation decision. Are the proposed facilities consistent with the comprehensive plan and any other plans for the area, including the 201 Facility Plan or 208 Water Quality Management Plan, as they affect water quality? If you have any further comments or questions, please call 320-8333, Extension 5272. Recommend Recommend No Date Approval Disapproval Comment Signature of Representative 1. Management Agency 2. Local Government: Cities or Towns (If site s nside boundary or within three mile and Sanita n Dist icts. 3. ' Hoard of Co ty omm ssioners _� �1 L a Heal h Authoifty 02e (///}�� 5 CIty7County Planning uty 6. Council of Governments/Regional Planning 7. State Geologist (For lift stations, the signature of the State Geologist is not required. Applications for treatment plants require all signatures.) I certify that I am familiar with the requirements of the "Regulations for Site Applications For Domestic Wastewater Treatment Works," and have posted the site in accordance with the regulations. An engineering report, as described by the regulations, has been prepared and is enclosed. DATE Signature of Applicant TYPED NAME -3- WQCD-3 (Revised 8-83) 830351 All . Erie Water and Sanitation District P .O . Box 386 Erie , Colorado 80516 St . Vrain Sanitation District 600 nimcank Suite B Longmont , Colorado 80501 Dacono Sanitation District P .O . Box 204 Dacono , Colorado 80514 T_^_ Area Sanitation District P . O . Box 213 Fredericks , Colorado 80530 880351 Site Application' City of Northglenn Item D . This re-rating will be consistent with the proposed 208 plan. Currently this area is under study as part of the Lower South Platte Basin Study. It has been recognized in this study that additional treatment capacity will be needed in the Lower South Platte Basin, particularly in the Big Dry Creek Sub-Basin. There is also a need for wastewater treatment within Weld County which is not part of the Lower South Platte subcommittee. The facility currently meets and exceeds the standards on Big Dry Creek. The additional capacity will not effect the ability to continue to meet those standards . The engineering firm of James M. Montgomery was chosen for this project because of their background in this type of Aerated Lagoon Facility. A detailed report or presentation .can be made available upon request . 880351 CITY OF NORTHGLENN WASTEWATER MANAGEMENT PROGRAM 1987 MONITORING RESULTS I PLANT INFLUENT SECONDARY EFFLUENT FINAL EFFLUENT MONTH BOD SS I BOD DO SS I BOD DO SS JAN I 254 150 19 . 7 3 . 8 20 . 0 3 . 2 7 . 3 3 . 4 FEB I 225 214 19 . 9 2 . 7 18 . 0 4 . 2 9 . 8 3 . 5 MAR 212 184 20 . 4 2 . 9 25. 1 7 . 5 11 . 2 6 . 9 APR 220 159 18 . 0 0 . 9 28 . 8 8 . 0 10 . 2 3 . 6 MAY 188 141 22 . 0 0 . 9 34 . 0 3 . 4 7 . 3 1 . 6 JUN I 258 95 21 . 9 0 . 7 29 . 0 2 . 8 7 . 1 3 . 0 JUL I 259 121 14 . 0 2 . 6 22 . 0 6 . 7 7 . 9 2 . 7 AUS ! 262 182 9 . 1 2 . 8 6 . 6 7 . 8 7 . 2 5 . 5 SEP ! 296 164 13 . 1 3 . 3 20 . 8 8 . 0 8 . 8 6 . 6 OCT I 214 139 13 . 5 3 . 4 21 . 3 8 . 1 8 . 1 9 . 8 Nov I 233 166 15 . 8 4 . 3 17 . 0 3 . 9 5. 5 5 . 0 DEC I 263 158 19 . 2 4 . 5 18 . 6 2 . 8 7 . 8 3 . 4 1987 I I I AVERAGE I 240 156 117 . 2 2 . 7 21 . 8 I 5 . 5 8 . 2 4 . 6 82-85 AVERAGE I 223 165 19 . 0 4 . 9 25 . 0 I 5 . 0 8 . 2 6 . 0 NOTES : FOR 1987 ALL FLOW WAS TREATED UTILIZING 50% OF THE TREATMENT PROCESS 82-85 AVERAGE BASED ON UTILIZATION OF THE WHOLE FACILITY 880351 i = �� - �- _ - ` ' _I.�, _ / li �� 25 2\, �0 il 1 _ (�.� . - - '1 le ra •us / ` e ago I` I City of N • �� . ' . ' -- Northglenn \1 ` ,--- _ 35 6- // I a 1 !.— • • I a i • I ; • � ate' B a asE EA .• • {jI. ::N �E L• e _ -- I - �.� _ _F. -— - - • •- • • • I it flll!!ll I _- \ _ _ \ - -I, ./ (-_ruul?• T` 1 — 7 - i r I _ Wells for Drinking Water: Deeper than 100 ft . • Less than 100 ft . O Groundwater Flow ---•► Habitable Buildings ■ SCALE 124000 I 0 MILE 1000 _ 0 1000 2000 3000 '000 5000 6000 7000 FEET 1 5 0 1 KILOMETER _ (� 880351 CONTOUR INTERVAL 10 FEET NATIONAL GEODETIC VERTICAL DATUM OF 1929 5=' I _ - . S ., N I (,i al I I '" F I c. 1' \( I L II V �N',i n ^ I tis N(1 n rung RD. 1. f (/ :all 144,01 II 1 iur--- cio, .002'Att-OO 3 004 j NI el ( .,c.. :MTV nu 2 41 • e a !, • 1 Vogt AVE. / I V Y' , I \ • 1 / I . . - - J LSf T��w•-r T illr . r i, al a� r" c wi n+ 4 AIll .0 �. A 20. Avg. 71: m r M a. ),it MAX.rI Qurnl r: ?ICpuauc WELL 880351 CUT OF NORTUGLENN COLORADO FEASIBUITY STUDY FOR EXPANSION OF WASTEWATER TREATMENT FACILITY OCTOBER 1986 PRESENTATION HANDOUT JAMES Y. MONTGOMERY, CONSULTING ENGINEERS,INC. 122.00 East UM Avenue Aurora, Colorado 80014 30349S-4030 880351 CHAPTER 1 SUMMARY AND CONCLUSIONS INTRODUCTION The Noi:thglenn Wastewater Treatment Facility, situated on 180 acres in southwestern Weld County, Colorado, became fully opera- tional July 1 , 1982. This treatment facility consists of two main areas, namely: ( i ) an aerated lagoon system and ( ii) a storage reservoir. The aerated lagoon systems consists of two parallel trains of three cells each and has an average organic design flow equivalent to 4. 64 mgd. The storage reservoir has a working volume of 4,490 acre feet and is intended to provide irrigation water for the Farmers Reservoir and Irrigation Company ( FRICO) . Effluent from the treatment system is discharged to FRICO through the Bull Canal during the irrigation season. During the non- irrigation season, wastewater effluent is stored in the reservoir or discharged to Big Dry Creek , which is a tributary of the South Platte River. The General objective of this project as to evaluate the feasibil- ity of expanding the Northglenn Wastewater Treatment Plant and to develop a master plan for meeting future wastewater treatment needs. EVALUATION OF EXISTING FACILITIES Loadings During initial operation of the Northglenn facility, in late 1982 and early 1983, the system was organically and hydraulically over- loaded due to storm water entering the system. This storm water flow was eliminated in early 1983 and since that time the facility has been loaded below original design values. During 1985 the influent flow and organic loadings were approximately 75% and 90% of the respective design values. Performance Evaluation The aerated lagoon system performance has exceeded design expectations with respect to organic removal ( i .e. : BOD and suspended solids) , however, it has not achieved the expected level of nitrification (ammonia removal) . The original design anticipated removal of ammonia through biological nitrification in 880351 the third cells of the aerated lagoons, with corresponding reductions in alkalinity. To date , nitrification has not occurred in the third cells and corresponding alkalinity reductions are not present. However, to date, this lack of nitrification has not created significant operational problems in the lagoon or the storage reservoir. Comparison with Discharge Requirements NPDES Limits. The aerated lagoon system has operated well within the current NPDES limitations. A comparison of the NPDES BOD lim- itation of 30 mq/1 with the final secondary effluent BOD concentration from the aerated lagoon system and the final effluent BOD concentration from the storage reservoir is shown in Figure 3-15. During 1985, the final reservoir effluent BOD con- centration never exceeded 6 mg/1. A comparison of the final reservoir effluent suspended solids con- centration and the secondary effluent suspended solids concentra- tion with respect to the NPDES limit of 30 mg/1 is illustrated in Figure 3-16. The effluent suspended solids concentration from the combined secondary effluent has exceeded the 30 mg/1 limit on only six occasions since 1983. The final reservoir effluent suspended solids concentration has never exceeded the NPDES limitation. OPTIMIZATION OF EXISTING TREATMENT SYSTEM Operation and Maintenance In general , the operation and maintenance of the aerated lagoon system appears to have been satisfactory and only minor operation- al problems have been observed. The most significant operation and maintenance problems encountered are: build-up of grease and scum on the aerated lagoons, bearing failure in the blowers, and excessive corrosion of the inlet splitter box due to release of hydrogen sulfide. Dissolved oxygen concentrations, in the aerated lagoon cells, were monitored to determine the efficiency of blower use. It appears that blower operation can be varied throughout the day to conserve energy. Installation of timers to control blower operation could result in an $8, 000 per year savings in electrical energy. Capacity Testing Program The actual operating capacity of the Northglenn Wastewater Treat- ment System was evaluated through a capacity test program. During 880351 one test period, the total influent flow was directed to the west side lagoons. The results of this field testing along with development of a complete mix model to predict lagoon performance , indicates that the actual operating capacity of the system is 6. 5 mgd rather than the 4. 64 mgd specified in the original design criteria. Although the rated capacity of 6. 5 mgd has been justified by actual field operation, as discussed in Chapter 4, it is recommended that the City continue directing the entire flow to the west cell lagoons through the winter of 1986/1987 to confirm the effects of temperature on treatment capacity. The organization and analysis of data collected during the above monitoring program and for overall process control would be greatly enhanced through use of a micro or personal computer available to treatment plant operator personnel. Such computer systems and the appropriate software are readily available in the market place and can be obtained for a minimum expenditure. It is therefore recommended that the City obtain a micro or personal computer with appropriate software for efficient process analysis and performance monitoring. FACILITIES EXPANSION It is recommended that the existing Northglenn Wastewater Treat- ment Facility be rated at 6. 5 mgd capacity to meet the existing NPDES discharge limitations. Chapter 5 presents a series of ex- pansion phases for increasing the capacity of the Northglenn Wastewater Treatment System to meet current NPDES limitations. Each expansion phase has been based upon a logical construction sequence and does not correspond to a specific projected flow or future design population. These expansion phases are illustrated in Figures 5-1 to 5-5. Although the plant is capable of expansion up to 66 mgd, the City of Northglenn does not currently have any plans to proceed with such an expansion. However, this should be considered as an alternative for wastewater treatment in the lower South Platte River Basin. The cost for expanding the existing aerated lagoon system to meet current NPDES limitations are signi- ficantly lower than the cost of constructing conventional mechanical treatment facilities. Environmental Assessment The primary and secondary environmental impacts of expanding the existing treatment facility have been assessed in a preliminary nature. The results of this assessment are summarized in Chapter 5. In addition, Chapter 5 presents various methods for mitigating adverse environmental impacts. In general, expansion of the existing facility will have little detrimental impact on the surrounding environment. The City' s original Environmental Impact Statement ( EIS) appears to be valid for future expansions. 880351 RECOMMENDATIONS The following recommendations are based upon the results and conclusions presented in this report: 1 . The rated design capacity of the Northglenn wastewater Treatment System should be increased from 4 .64 mgd to 6. 5 mgd. 2. The City should continue to direct 100% of the influent wastewater to the west side lagoons through the winter of 1986/1987 to verify the impact of winter time tempera- tures on lagoon performance, and to verify the rated design capacity of 6.5 mgd. 3. System performance should be monitored in accordance with the field testing program outlined in Chapter 4 through the 1986/1987 winter period to assist in verifying plant capacity. 4. The City should purchase a micro or personal computer with appropriate software to assist in process analysis and data monitoring of the treatment facilities. 5. Timers should be installed to regulate blower operation through the 24 hour diurnal cycle and to reduce power costs. Blower capacity can be reduced during the hours of 10:00 a.m. and 4:00 p.m. , resulting in an annual savings of approximately $8,000. 6. All of the existing blowers should be repaired immedi- ately to improve overall system performance and redun- dency. 7. The influent flow splitting structure should be replaced and a system installed for control of hydrogen-sulfide generated in the influent force main. 8. The aerated lagoon process should be employed for expan- sion of the wastewater treatment system if effluent qual- ity is governed by current NPDES Permit Limits. 9. Samples of sludge accumulating in the bottom of each cell should be collected and analyzed for heavy metals and priority pollutants to assist in planning ultimate sludge disposal. These analytical results should be analyzed to determine the amount of land required for final disposal of the accumulated sludge. 10. The Probable Total Project Costs and operation and main- tenance costs presented in the report are comparable with other wastewater treatment facilities for this service area and should be updated to reflect current conditions 880351 when making future planning decisions. 11. The City should correlate the expansion phases presented in this report with projected population growth and in- creases in wastewater flow for the projected service area and develop an appropriate implimentation plan and schedule. 880351 -- u ISCOSSS SOD (mon) o IS '3' S5' o b" S' IL an c lie Ii II CD m ` co ca v o n z r o nf- C i pI an Z 'C z to co rn y Ng ; _D v C Z v ._ an gin Dr c m In (xi f Q a m N O z TOTAL SUSPENDED SOLIDS (mg/I) o e 3 g g g g T s i I I Clig i 1 f) I C COCa c- CD v CO O v 2 O al p an i I 1v c a > �Cl, > m m G) cn o II i z o I r en g X17 > 33 g s C. 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