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Home My WebLink About2433 Resolution RESOLUTION NO. ,A A. A Resolution amending the Comprehensive Sewer Plan of the City of Pasco. WHEREAS, the City has an adopted Comprehensive Sewer Plan, dated November 1992, by SCE Donahue; and WHEREAS, by Ordinance No. 3104, passed on August 21, 1995, the city Council adopted the City of Pasco Comprehensive Plan 1995-2015, including as a part thereof the City of Pasco Comprehensive Sewer Plan, November 1992 (the "Comprehensive Sewer Plan"); and WHEREAS, by Ordinance 3239, passed on June 16, 1997, the City Council specified and adopted the Comprehensive Sewer Plan as the system or plan relating to sewers for the Waterworks Utility (the "System or Plan"); and WHEREAS, the Comprehensive Sewer Plan provides details establishing preferred routes for future trunk sewers within the urban growth area for the City of Pasco; and WHEREAS, the Department of Ecology approved the City of Pasco Wastewater Facility Plan and Supplements on February 25,1994; and WHEREAS, the City has re-evaluated the location of the trunk sewer to service the Riverview area; and WHEREAS, a new preferred trunk sewer route has been identified which provides better service to the area at a lower cost; NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF PASCO DOES ORDAIN AS FOLLOWS: Section 1. That the Comprehensive Sewer Plan, Section III.2.2.1. Northwest Pasco Annexation Area, and Section III.2.2.2. Riverview Area, be amended with a new preferred scenario to read as follows: An extension of the trunk sewer to provide future services to the Northwest Pasco Annexation Area and the Riverview Area shall follow an alignment along the south side of the area, running generally parallel to the Columbia River. The route shall be approximately as shown on the new map labeled Figure III -- 11, dated March 10, 1999. The associated North- South Interceptors shall be connected to the above mentioned trunk sewer. Section 2. Two additional lift stations as shown in Figure III- 11 will be required with auxiliary power supplies. Section 3. Figure III-11 shall amend the maps, as appropriate, in the Comprehensive Sewer Plan. Section 4. This change shall not affect the population and land use densities in the approved Comprehensive Sewer Plan. The plan is consistent with GMA. Section 5. That all remaining terms of the Comprehensive Sewer Plan shall remain in effect. Passed by the City Council of the City of Pasco this 15th day of March, 1999. Mayor ATTEST: City Clerk APPROVED AS TO FORM: City Attorney Amendment to the Comprehensive Sewer Plan dated November 1992 City of Pasco Executive Summary The Comprehensive Sewer Plan for the City of Pasco, dated November 1992, prepared by SEC Donahue, provided details for establishing preliminary routes for future trunk sewers into the Riverview area. The City has refined the location of the trunk sewer to service the Riverview area to provide a more efficient and cost effective route. The proposed main line and the proposed pressure lines are to be paid for by the utility rate structure. Utility Local Improvement Districts (U.L.I.D.'s) will be used to install the proposed sewer lines into the neighborhoods. Discussion SCE Donahue prepared the Comprehensive Sewer Plan (the "Plan") for the City of Pasco, dated November 1992. The City Council passed Ordinance No. 3104 on August 21, 1995 that adopted the City of Pasco Comprehensive Plan 1995 — 2015. The Comprehensive Sewer Plan was included as a part of that Comprehensive Plan. The City Council passed Ordinance No. 3239 on June 16, 1997 that specified and adopted the Comprehensive Sewer Plan as the system or plan relating to sewers for the Waterworks Utility. The Comprehensive Sewer Plan provided details establishing preliminary routes for future trunk sewers. Section III of the Plan, Proposed Collection System, discusses the design considerations used in the locations of the sewer lines. The design analysis for this amendment used the population and land use densities contained in the Plan. The following table is a summation of the design Estimated Estimated Land Map Estimated Ave Daily Peak Area Boundary Population Demand Demand Area (acres) Color (each) ( m) ( m) Service Area 1 863 Dark Blue 5029 349 873 Service Area 2 558 Green 3078 214 535 Service Area 3 167 Red 879 61 153 Service Area 4 592 Light Blue 1352 94 235 Service Area 5 1 1457 Orange 5845 406 1015 (See the Appendix for the Population and Demand Calculations) x The layout of the proposed trunk line was established and the elevations were checked. A cost analysis was done for the River Route (proposed by this Amendment) of$2,162,525 and for the Court Street Route of$3,264,523 (see Appendix for details of estimates). The reason for the difference in cost is the difference in the depth of the installation of the pipeline. These results show that the proposed route is more efficient and cost effective. Details The following changes need to be made to the Comprehensive Sewer Plan. 1. Add to Section III.2.2.1. Northwest Pasco Annexation Area, and Section III.2.2.2. Riverview Area, to amend the Plan with an additional scenario to read as follows: An extension of the trunk sewer to provide future services to the Northwest Pasco Annexation Area and the Riverview Area shall follow an alignment along the south side of the area, running generally parallel to the Columbia River. The route shall be approximately as shown on the attached map labeled Figure III — 11. The associated North-South Interceptors in the Plan shall be connected to the trunk sewer. The final route of the trunk sewer may follow another route generally accomplishing the same purpose as described above. 2. The attached map shall amend the Figures III-2, III-4, and III-7 in the Comprehensive Sewer Plan. 3. Two additional lift stations will be required with auxiliary power supplies. The lift station in Service Area 2 shall have a minimum wet well capacity of 2,000 gallons, with two pumps, at a discharge pumping rate of 500 gpm each. The lift station in Service Area 4 shall have a minimum wet well capacity of 1,000 gallons, with two pumps, at a discharge pumping rate of 500 gpm each. 4. All remaining terms of the Comprehensive Sewer Plan shall remain in effect. GVON .......... --- ------- V) 11 0 �7 Z9 avO8 off Cot 'LL=-,—L-j 1z W __ µg±doa JL----- ..-j j '�f m � 99 avow ir D Z C14 Lrui ----------- 71 ®r, LLJ *9 OV08 LL1 L tt C CL 0 CL LLJ U) 96 aVO8 LLJ 0 z z OOL CIVOM LLJ A3 LLJ cn C) LL. Population and Demand Calculations Calculations based on City of Pasco Comprehensive Sewer Plan, Dated November 1992 Densities in Table 1.1 - Land Use/Zoning Criteria Service Area 1 (Dark Blue) Comprehensive Plan Table 1.1 Data Contribution Per Capita 100 gal/day Res Trans L.D. Res Units/Acre 0.2 4 Individ/Unit 3.3 3.3 Individ/Acre 0.7 13.2 Acres % of Area Population Service Area size 863 Res Trans size 509 59.0 356 Low Den Res 354 41.0 4673 Total 5029 *' Estimated Average Daily Demand 5,029 Individuals X 100 gal/day/Individ 502,900 gpd — 349 gpm ** Estimated Peak Demand 349 gpm X 2.5 Peaking Factor 873 gpm ** **These numbers used in the report. Demand Calcs021799.xls 319/99 1 Service Area 2 (Green) Com rehensive Plan Table 1.1 Data Contribution Per Capita 100 gal/day Res Trans L.D. Res Units/Acre 0.2 4 Individ/Unit 3.3 3.3 r Individ/Acre 0.7 13.2 Acres %of Area Population Service Area size 558 Res Trans size 343 61.5 240 Low Den Res 215 38.5 2838 Total 3078 Estimated Average Daily Demand 3,078 Individuals X 100 gaVday/Individ 307,800 gpd 214 gpm Estimated Peak Demand 214 gpm X 2.5 Peaking Factor 535 gpm These numbers used in the report. Demand Calcs021799.xls 3/9/99 2 Service Area 3 (Red) Comprehensive Plan Table 1.1 Data Contribution Per Capita 100 gal/day Res Trans L.D. Res Units 1 Acre 0.2 4 Individ/Unit 3.3 3.3 Individ/Acre 0.7 13.2 Acres % of Area jPopulation Service Area size 167 Res Trans size 106 63.5 74 Law Den Res 61 36.5 805 Total 879 Estimated Average Daily Demand 879 Individuals X 100 gal/day/Individ 87,900 gpd 61 gpm *' Estimated Peak Demand 61 gpm X 2.5 Peaking Factor 153 gpm `* "These numbers used in the report. Demand CaIcsO21799.xls 3/9/99 3 Service Area 4 (Light Blue) Comprehensive Plan Table 1.1 Data Contribution Per Capita 100 gal/day Res Trans L.D. Res Units/Acre 0.2 4 Individ/Unit 3.3 3.3 Individ /Acre 0.7 13.2 Acres % of Area Population Service Area size 592 Res Trans size 517 87.3 362 Low Den Res 75 12.7 990 Total 1352 " Estimated Average Daily Demand 1,352 Individuals X 100 gal/day/Individ 135,200 gpd 94 gpm "* Estimated Peak Demand 94 gpm X 2.5 Peaking Factor 235 gpm "* **These numbers used in the report. Demand Ca1cs021799.xls 3/9199 4 Service Area 5 (Orange) Comprehensive Plan Table 1.1 Data Contribution Per Capita 100 gal/day Res Trans L.D. Res Units/Acre 0.2 4 Individ/Unit 3.3 3.3 Individ/Acre 0.7 13.2 Acres % of Area I Population Service Area size 1457 Res Trans size 1071 73.5 750 Low Den Res 386 26.5 5095 Total 5845 *' Estimated Average Daily Demand 5,845 Individuals X 100 gallday/Individ 584,500 gpd = 406 gpm " Estimated Peak Demand 406 gpm X 2.5 Peaking Factor 1,015 gpm ** *' These numbers used in the report. r Demand Calcs021799.xis 3/9/99 5 Capacity and Demand for the Two Pipe Sizes Using Mannings Equation for a 36" pipe Total Peak Demand 2,811 gpm flowing half full (all areas)the discharge (All areas) capacity is 3350 gpm. Using Mannings Equation for a 24" pipe Total Peak Demand 1,250 gpm flowing half full (areas 4 &5)the discharge (Area 4 & 5) capacity is 1440 gpm. Demand Calcs021799,xls 3/9/99 6 ■IIIIIIII IIIII III 1 II I� �a� n ,,, NN o0 00 000 =3 O O cn co M cn CD CO cn M co re- MCh CD co MMCO) ChM ChM MM MM MMM O coo -� MM ChM MM ChM M MM r rrr r " � C L a y� NN It 141t pp NO 000 c O O ca � nn nn nn nn nnn o 000 0 00 r r rr rr r rr N NNN N NN _ L a c -tea c o Y °- y �, U f, . a -. C C C: m N — 4� C �� _ = d w m L C Q1 'C7'�' C y CU N N (C Q " +r J°r- c_ OQ Cl) Q 0 O � c = u aci co CD t9 H a- � c o_ o cn Z C r N M 4- ? .J w C 24" PROPOSED SANITARY SEWER C ROAD 56 TO ROAD 96 RIVER ROUTE (DISTANCE BY CAD) 17537 LINEAR FEET 1. Furnish install 24" CONC Pipe $876,850 17537 Linear Feet @ $50.00 2. Furnish & Install Manholes (450 spacing) $180,000 45 @ 4,000 3. Imported Bedding (24") $170,300 170301.f. @ $10.00 4. Trench Protection Lump Sum $20,000 5. Exc/Backfill Exc/Backfiil 12 to 17 foot Extra Deep 2200 If @ $40.00 $88,000 6. Fill (Pipe Cover) 1200 liner So. Of Adams St. — 1500' Rd 52 to Park Street 5000±c.y. @ $12.00 $60,000 7. Extra Depth Manhole 21 I.f. @ $150.00 $3,150 8. Clear & Grubbing &Asphalt Removal Lump Sum $40,000 9. Asphalt Concrete Paving —2" 1550 tons @ $35.00 ± 100 Ton @ $35.00 $54,300 Asphalt Areas $3'500 Sylvester - Road 56 to 60, Sylvester- Road 60 to 62 Park - Road 68 E. To End, Henry— Road 68 to Road 70 Bike Path— 1100 l.f. x 10', Access Road to Chiawana Park (400=) West Parking Lot of Chiawana Park 10. Traffic Control Lump Sum $20'000 11. Crushed Rock (Miscellaneous Shoulder Rdway Road 70— Bike Path Shoulder) 1000 ton @ $12.00 $12,000 12. Landscape Repair Corps property along Bike Path — Hydro Seed? Lawn Repair @ Chiawana Park — Resod? Pasture Repair -- Reseed or Sod? Fence Removal & Replacement S100,000 13. Mobilization 581.405 Subtotal $1,709,505 15% Cont. $256.426 Subtotal S1,965,931 10`'o Eng & Design S196.594 f 24"PROPOSED SANITARY SEWER ROAD 56 TO ROAD 96 ROAD 60 TO COURT— COURT TO ROAD 96 (DISTANCE BY CAD) 174+97 1. Furnish install 24" CONC Pipe - _ 17497 Linear Feet @$55.00 $962,335 2. Furnish & Install Manholes (450 spacing) 40 @ 4,000 $160,000 3. Trench Protection Lump Sum $50,000 4. Imported Bedding(24") 17497 @ 10.00 $174,970 5. Exc/Backfill Exc/Backfill 12 to 17 foot= 7001.f. @ $50.00 $35,000 Exc/Backfill 17 to 22 foot= 7200 l.f @$60.00 $432,000 Exc/Backfill 22 to 27 foot= 13501.f. @$65.00 $87,750 6. Extra Depth Manhole (Over 12") 1271.f. @$150.00 $38,100 7. Clear & Grubbing&Asphalt Removal Asphalt for Trenching 15'Av x 17497 = 29161 sq yrd @ $5.00 $145,805 8. Asphalt Patching& Rock Court Street 15% Av wide 13785 l.f. = 22,975 sq yd x 4" = 5389 ton @ $35.00 $188,648 Sylvester Road 56 to Court 3712 15 x 3712 6187 sq yd x 2" = 7 26 ton @ $35.00 $25,410 9. Traffic Control Lump Sum $100,000 10. Crushed Rock for Patching 17497' x 15'x 4"= 3208 cy x 1.5 = 4812 ton @ $12.00 $57,744 11. Mobilization (5% of Construction Cost) $122.888 Subtotal $2,580,650 15% Cont. $387.098 Subtotal $2,967,748 101'c Eng & Design $296.775 GRAND TOTAL $3,264,523