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HomeMy WebLinkAbout2.0 Engineering Report1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 I-70 NO NAME REST AREA GLENWOOD CANYON, COLORADO ENGINEERING REPORT ON THE WASTEWATER TREATMENT SYSTEM Prepared to accompany the Application for Site Approval for Construction of Domestic Wastewater Treatment Works by the Colorado Department of Health Prepared by PARSONS DeLEUW, INC. 1700 Broadway, Suite 800 Denver, CO 80209 and DANIEL, MANN, JOHNSON & MENDENHALL 410 17th Street, Suite 300 Denver, CO 80202 For the COLORADO DEPARTMENT OF TRANSPORTATION P.O. Box 1430 Glenwood Springs, CO 81602 May, 1992 I-70 NO NAME REST AREA GLENWOOD CANYON, COLORADO ENGINEERING REPORT ON THE WASTEWATER TREATMENT SYSTEM Prepared to accompany the Application for Site Approval for Construction of Domestic Wastewater Treatment Works by the Colorado Department of Health Prepared by PARSONS DeLEUW, INC. 1700 Broadway, Suite 800 Denver, CO 80209 and DANIEL, MANN, JOHNSON & MENDENHALL 410 17th Street, Suite 300 Denver, CO 80202 For the COLORADO DEPARTMENT OF TRANSPORTATION P.O. Box 1430 Glenwood Springs, CO 81602 May, 1992 CONTENTS 1. Project Description 2. Service Area 3. Proposed Effluent Limitations 4. Existing Facilities 5. Treatment Alternatives Considered 6. Flood Plain and Natural Hazards 7. System Description 8. Site Control 9. User Contracts 10. Control of Capacity Limitations 11. Financial System 12. Schedule 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 I-70 NO NAME REST AREA WASTEWATER TREATMENT SYSTEM 1. Project Description. The No Name Rest Area is located on Interstate 70 in Glenwood Canyon approximately 2.4 road miles east of Glenwood Springs, Colorado. Construction of the rest area is presently scheduled to begin in mid-to-late 1992. Included in the rest area will be bicycle and pedestrian paths, picnic facilities, a public comfort station containing lavatory and toilet facilities, and a Landscape Service Facility housing landscape maintenance equipment. All of these facilities will be owned and maintained by the Colorado Department of Transportation (CDOT). 2. Service Area. The No Name Rest Area wastewater treatment system will serve only the public comfort station and the nearby CDOT landscape service facility. The public comfort station will contain 6 flush type toilets, 3 urinals, 6 lavatories, 2 drinking fountains inside and 1 outside, and 1 utility sink. Wastewater from the landscape maintenance facility will be limited to drainage from one utility sink. 3. Proposed Effluent Limitations. This item is not applicable to a septic tank and leaching field such as is to be constructed at the No Name Rest Area. 4. Existing Facilities. The No Name Rest Area is an entirely new facility so there are no existing facilities. 5. Treatment Alternatives Considered. Since the rest area is not contiguous to Glenwood Springs and because of the distance involved it was determined that the No Name Rest Area wastewater treatment works would consist of a septic tank and leaching field. The system is similar to that installed in the other rest areas in Glenwood Canyon. Aesthetic considerations were considered in choosing a system which would have no visible presence in the canyon. No other wastewater treatment alternatives were considered viable at this location. 6. Flood Plain and Natural Hazards. The Colorado Department of Transportation has studied the flood levels in the Colorado River as part of the design of Interstate 70 and the bike path adjacent to the river. The 1 of 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 bike path has been designed to be above the 5 -year frequency flood and I-70 has been designed to be above the 100 -year flood. The CDOT has calculated that the water surface of the Colorado River at the No Name Rest Area during the 100 -year flow of 21,000 cfs will be approximately Elevation 5790. The ground level at the site of the septic tank and leaching field is approximately Elevation 5830, or 40 ft. above the 100 -year flood level. In our opinion, there is no potential threat to the rest area's wastewater system from a 100 -year flood in the Colorado River. The area where the No Name Rest Area is located is relatively flat and not exposed to avalanches. In our opinion, the septic tank and leaching field are not susceptible to natural hazards at this location. 7. System Description. The entire project is located within the CDOT's I-70 right-of-way in Glenwood Canyon. The wastewater treatment system will consist of 5 - 1250 gallon concrete septic tanks connected in series and a 3,150 square foot leaching field constructed of "Infiltrator" type infiltration chambers. The average daily wastewater flow during the summer season is estimated to be approximately 3240 gallons. Wastewater flow is expected to vary greatly with the seasons. The leaching field has been designed for a flow of 4900 GPD, derived by peaking the average flow of 3240 GPD by a factor of 1.5. The construction specifications will require the contractor to provide fill material, at the location where the leaching field will be located, having a percolation rate of 12 minutes/ inch. The BOD5 is estimated at 0.04 lbs. for each 15 gallons, in accordance with the "Guidelines on Individual Sewage Disposal Systems" published by the Colorado Department of Health. The design BOD5 loading = (3240 GPD/15) x 0.04 = 8.64 lbs. BOD5/day. The Glenwood Springs Water Supply Intake on No Name Creek is approximately 0.75 miles north of the proposed location of the leaching field and approximately 400 feet higher in elevation. The Glenwood Springs Wastewater Treatment Plant is approximately 4.5 miles downstream on the Colorado River. The septic tank and leaching field will not require an operational staff but will be maintained by CDOT maintenance personnel as part of the ongoing maintenance of the rest areas in Glenwood Canyon. 8. Site Control. The project is to be constructed entirely on land owned by the Colorado Department of Transportation. The site will be under the permanent control of the CDOT. 2 of 3 9. User Contracts. The system will treat only wastewater from the No Name Rest Area Comfort Station and the Landscape Service Facility. There will be no other connectors and therefore no user contracts. 10. Control of Capacity Limitations. The CDOT personnel will have complete control to operate the system within the capacity limits of the system. No additional connections are anticipated and no expansion of the rest area comfort facilities is planned. The plumbing fixtures in the comfort station are to be equipped with flow limiting devices. 11. Financial System. The No Name Rest Area will be owned, operated, and maintained by the Colorado Department of Transportation. CDOT will budget funds to provide for the continued operation, maintenance, repair, and replacement of the components of the wastewater treatment system during the life of the rest area. 12. Schedule. The current schedule for the rest area is to solicit bids for the work in late May 1992. Construction will begin in mid to late 1992. The rest area is scheduled to be open for public use by August 1993. Final completion and cleanup is scheduled for November 1993. 3 of 3 4Il COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 • S COLORADO DEPARTMENT OF TRANSPORTATION DIVISION OF HIGHWAYS - STATE OF COLORADO SPECIAL PROVISIONS NO NAME REST AREA [THIS PROJECT IS COMBINED WITH PROJECT I(CX) 70-2(188) FOR CONSTRUCTION] The Standard Specifications for Road and Bridge Construction, dated 1991, controls construction of this project. The following special provisions supplement or modify the Standard Specifications and take precedence over the Standard Specifications and plans. REQUIRED PROVISIONS ON FEDERAL -AID CONTRACTS - Form FHWA 1273 Rev. 8-89. PROJECT SPECIAL PROVISIONS Index Pages Notice to Bidders Commencement and Completion of Work Contract Goal Description of Project Revision of Section 101 -Definitions and Terms -Revision of Section 102 -Bidding Requirements and Conditions Revision of Section 104 -Scope of Work Revision of Section 105 -Control of Work Revision of Section 107 -Legal Relations and Responsibility to Public Revision of Section 107 -Erosion Control/Water Quality Requirements Revision of Section 108 -Prosecution and Progress Revision of Section 109 -Measurement and Payment Revision of Section 202 -Removal and Trimming of Trees Revision of Section 203 -Excavation and Embankment Revision of Section 203 -Cut Slope Stabilization Revision of Section 207 -Topsoil (Special) Revision of Section 209 -Dust Palliative Revision of Section 212 -Native Seeding Revision of Section 212 -Lawn Seeding Revision of Section 213 -Mulching Revision of Section 213 -Mulch Tackifier Revision of Section 213 -Concrete Landscape Border Revision of Section 213 -Tree Grate 11 Page (April 10, 1992) 11-l1x- lly-llz (April 10, 1992) 12 (April 10, 1992) 13-14 (April 10, 1992) 15 (April 10, 1992) 16 (April 10, 1992) 17-18 (April 10, 1992) 19-21 (April 10, 1992) 22-26 (April 10, 1992) 27-31 (April 10, 1992) 32-44 (April 10, 1992) 45-47 (April 10, 1992) 48-64 (April 10, 1992) 65 (April 10, 1992) 66-68 (April 10, 1992) 69-72 (April 10, 1992) 73 (April 10, 1992) 74-76 (April 10, 1992) 77-78 (April 10, 1992) 79-82 (April 10, 1992) 83-85 (April 10, 1992) 86 (April 10, 1992) 87-88 (April 10, 1992) 89 (April 10, 1992) 90 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM Section 622 of the Standard Specifications is hereby revised for this project as follows: Subsection 622.01 shall include the following: 622.01 Description of Work This work shall consist of preparing detailed design plans, erecting and furnishing the Landscape Service Facility Building (LSFB); furnishing and constructing the Water Treatment System; and furnishing and constructing the Sanitary Sewerage System. All work will be done as shown on the plans and as set forth in the specifications. Work described in this revision does not cover the Comfort Station. Landscape Service Facility Building. Floor plans showing the general layout and dimensions, as well as the location of water treatment equipment, furnishings, appurtenances and storage facilities are included in the project plans. Additional furnishings, equipment and appurtenances not shown on the plans are to be installed at the locations directed by the Engineer. Schedules of these items are included in Subsections 622.09, 622.23, 622.24, and 622.25. The detailed design of the LSFB building including all mechanical, heating and ventilation, electrical, plumbing, concrete storage tanks for industrial waste, foundation, foundation excavation, and backfill. shall be the sole responsibility of the Contractor. dater Treatment System. Water Treatment Systemand its components are shown on the plans. This work includes, but is not limited to, the following: The Well and Submersible Pump The 10,000 Gallon Storage Tank The Fiydropheumatic System and Booster Pump The Chlorination System The Irrigation Pump System Sanitary Sewerage System. S,:nitary Sewerage System and its components are shown on the plans. This work includes, but is not limited to, the following: Septic Tanks Distribution Boxes Leach Field 274 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -2- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM Codes and Standards. Perform all work in compliance with applicable requirements of governmental authorities having jurisdiction. Data and Measurements. Soil investigation and test well reports are available for examination at the Engineers office. Additional test borings and other exploratory operations may be made by the Contractor at no cost to the project. Subsection 622.02 shall include the following: 622.02 All materials specified for water treatment system shall be suitable for use with potable water and shall be acceptable to the National Sanitation Foundation (NSF), American Water Works Association (AWWA), or other recognized reviewing agencies. Subsection 622.03 shall include the following: 622.03 Shop Drawings and Descriptive Brochures Shop drawings shall be prepared to agree with and supplement the building floor plans, site plan, layout plan, and piping plan. Shop drawings shall show the detailed design of the building including foundation, interior/exterior walls and roof, plumbing, lighting, electrical and heating/ventilation, design of site and outdoor or underground facilities, and a complete description of all materials to be used in the construction of the Landscape Service Facility building, Water Treatment System, and Sanitary Sewerage System. The Contractor shall submit the shop drawings in accordance with the requirements of Subsection 105.02. Subsection 622.04 shall include the following: 622.04 Construction Material Structure excavation and structure backfill shall conform to the requirements of Section 206. Concrete shall be Class "B" and conform to the requiremen;:s of Section 601. Reinforcing steel and welded wire fabric shall conform to the requirements of Section 602. 275 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -3- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM Subsection 622.06 shall include the following: 622.06 Maintenance Manuals Manuals shall be included for the following equipment: chlorination system, well and submersible pumps, storage tanks, hydro -booster system, irrigation and truck fill pump systems, heating and ventilation system for building, sanitary sewerage system and indoor/outdoor lighting system. Subsection 622.09 shall include the following: 622.09 Building Design The Landscape Service Facility building shall consist of a single weather tight building of steel construction, rigid frame design with a concrete foundation as shown on floor plans. The building shall be of standard prefabricated design. The exterior metal panels shall be constructed of 24 gauge (minimum) metal for the roof, and 26 gauge (minimum) metal for walls. Clear ceiling height shall be a minimum of ten feet. The exterior metal panels shall be painted with an enamel that matches the walls on the Comfort Station. Color samples shall be submitted to the Engineer for approval. The size of the building shall be as indicated on the plans. It shall consist of one Open Work Area, and one Secured Storage Area, and one enclosed Water Treatment Room as shown on the floor plans. The building shall be designed to withstand a minimum live load due to snow of 40 PSF on the horizontal projection and a minimum wind load of 20 PSF of vertical projection. The roof shall be double pitched and slope shall not be less than 4 inches in 12 inches. Clear ceiling height shall be a minimum of 10 feet. The foundation shall be designed to withstand all loads from the building equipment and floor system. Foundations shall be designed for a maximum soil bearing pressure of two tons per square foot. Concrete slab shall be a minimum of six inches thick and designed to meet minimum wheel load of 8,000 pounds. A 1-4 inch concrete threshold shall be provided under the interior door to the Water Treatment Room. Concrete floor shall be a non-skid finish and finished with two coats of penetrating sealant. Application shall be in accordance with the manufactur :'s directions. A 4'-6" wide galvanized metal grating walkway sh,._1 be provided at the west building entrance. The grating walkway shall be supported with a painted steel 276 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -4- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM framework attached to the building foundation and concrete caisson oundations as required. A 36 inch high painted steel pipe handrail with 2 intermediate pipe rails shall be installed on the outside edges of the gating walkway. The walkway shall be designed to carry 85 lbs./ft. . The elevation of the building shall be set so the parking area, driveway, and site grading on the sides of the building will be sloped away from the building and surfaced as shown on the plans„ Building furnishings shall include the following° (a) Fire Extinguishers: Three multi-purpose dry electrical, ABC stored pressure fire extinguishers, U/L Rating 4A:60B:C, 20 pound capacity. Location as directed. The following furnishings and appurtenances to the Secured Storage Area shall be located as shown on the plan or as directed by the Engineer: (a) Chain Link Fence and Gate. Storage area shall be secured with 6 foot high fence and 3 foot wide walk gate. Materials, design and construction shall be provided in accordance with Section 607. (b) Locker Cabinet. One metal cabinet equipped with a minimum of 4 individual cabinets, each cabinet with a minimum interior size of 4 cubic feet. Locker doors shall have combination locks. Location to be determined by Engineer. (c) Storage Cabinets. Three cabinets (55 square feet) shall be placed at locations within Secured Storage Area as°directed by the Engineer. Cabinets shall be lockable. (d) NorkBenches. Two heavy duty Industrial workbenches each with the minimum requirements as follows: 72"L x 36"W x 334"H; 12 ga. steel legs and cross supports; 12 ga. steel top or 1-3/4" solid maple top; 14 ga. steel. 3" rails on sides and back; 12 ga. steel lower shelf; 72"L x 15"W x 12"H 12 ga. steel riser shelf with back top; two heavy duty drawers, lockable, 12 ga. steel, 15"W x 18"D x 8"H, attached underneath top; construction shall be of industrial quality with no sharp corners or edges, finished for durability and rust resistance. 277 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -5- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM Subsection 622.14'shall include the following: 622.14 Door, Frames, and Windows (a) Interior door shall be one double swing door with 5'-0" opening for the Water Treatment Room, as located on the plans. (b) Two exterior walk-in doors shall be steel, industrial honey -combed type, with one coat of factory applied baked -on enamel and shall be complete with full weather stripping, threshold, and panic bars. Walk-in doors shall be at least 3 feet 6 inches by 7 feet 0 inches with standard clear windows with security bars, heavy duty ball bearing hinges and dead bolt locks. Location is shown on the plans. (c) Exterior vehicle doors shall be steel, industrial type overhead double faced, insulated doors with one coat of factory applied baked -on enamel, complete with weather stripping and -locks. Each door shall be 12 feet wide by 8 feet in height. (d) All exterior and interior doors shall be equipped with individual. locks with three keys. Four master keys shall be provided. (e) Windows shall be located as shown on the floor plan. Each window shall have two thicknesses of glass so as to form a storm or insulated window, and shall be capable of being opened for at least one-half its area. Each window shall be rectangular in shape and shall have total glazed area of not less than 15 square feet. Windows shall be equipped with removable wire screening and locks. All windows shall have security bars. Subsection 622.16 shall include the following: 622.16 Roofing, Flashing, and Roof Insulation Roofing shall be standing metal seam roof constructed from 24 gauge (minimum) metal. Color to match roof of Rest Area building. Submit sample color to Engineer for approval_ Gutter and downspoutes shall be provided to drain water away from the paved areas. 278 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -6- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM Subsection 622.17 shall include the following: 622.17 Carpentry (c) A11 interior walls shall be typical 4" dry wall construction. Subsection 622.21 shall include the following: 622.21 Painting and Special C©ati�lg Application Interior walls shall be painted beige. Submit color sample to Engineer far approval. Exterior walls and roof shall be painted to match color of Rest Area building. Submit color sample to Engineer for approval. Subsection 622.22 shall include the following: 62222 Plumbing and Drainage (1) NSF Label Water Storage Tank. The NSF Label underground, fiberglass, single wall water storage tank shall have a nominal storage volume of 10,000 U.S. gallons and shall be approximately 7°-11" diameter by 30".5" long, suitable for burial a minivan of 5 feet and a maximum of 7 feet below grade. The tank shall be suitable for storage of chlorinated potable water in accordance with the NSF and local health authority. The tank shall be provided with anchor lugs and tie down straps to permit attachment to a concrete flotation slab. The tank shall be provided with the following appurtenances: 1. 30" diameter manway with cover, gasket, and bolts. 2. 48" diameter containment collar. 3. 48" high sealed piping turbine. 4. 4" National Pipe Thread (NPT) opening for level control 5. NSF label 6. 4" NPT vent 7. 4" NPT fill 8. 4" NPT suction 9. Necessary electrical, coupling, and adhesive kits The tank shall be fully supported on a select backfill material meeting CDOT Specification 703.09 Class C. 279 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -7- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM (m) Water Storage Tank (Non -Potable). The underground, fiberglass, single wall water storage tank shall have a nominal storage volume of 10,000 U.S. gallons and shall be approximately 7'-li" diameter by 30'-5" long and shall be suitable for burial a minimum of 5 feet and a maximum of 7 feet below grade. The tank shall be provided with anchor lugs and tie down straps to permit attachment to a concrete floatation slab. The tank shall be provided with the following appurtenances: 1. (2) 48" diameter manways with cover, gasket, and bolts. (Red Jacket Model No. 151035) 2. (1) 6" NPT opening in each manway.cover (pump). 3. (1) 4" NPT opening in each manway cover (vent). 4. (1) 4" NPT opening in each manway cover (fill). 5. (1) 4" NPT opening in manway cover for level control. 6. (2) 48" secondary containment collars. 7. (2) 48" diameter sealed piping turbines. 8. Necessary electrical, coupling, and adhesive kits. The tank shall be fully supported on a select backfill material meeting CDOT Specification 703.09 Class C. All openings shall be provided with standard NPT fittings with adequate clearances. (n) Concrete Flotation Slab. The concrete floatation slab shall be 18 inches beyond the outside dimensions of the water storage tank described above with a minimum thickness of 12 inches, and shall be located 12 inches below the tanks. Slab shall be designed by Contractor to prevent floatation of tank out of ground when tank is empty. Tie down straps shall be of the size andnumber recommended by the tank manufacturer to prevent floatation. Anchorage to concrete slab shall be as recommended by tank manufacturer. (o) Vent Pipe. The vent pipe shall be 2 inch PVC where buried and 2 inch schedule 40 galvanized ASTM A53 steel'above ground. The PVC pipe shall be buried a minimum of 2 feet below the finished grade and the steel gipe shall terminate 3 feet above grade with a 180 bend. The 180 return bend shall be covered with a 4 -inch opening stainless steel insert screen. 280 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -8- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM (p) Booster Pumps. The booster pumps (two required) shall be the centrifugal type and suction capable of producing 75 gpm at 65 psi. Horsepower shall be as recommended by the manufacturer, and in no case shall the pump operate in its service factor range. See the electrical specifications for exact motor requirements. Motor and pumps shall be close coupled with a discharge head which can be rotated to four positions 900 apart. Discharge and suction piping shall be the sizes shown on the plans and reduced at the pumps as .required,.. Each pump shall be provided with the following valves and fittings. Suction Piping - Shut Off Valves and Union Discharge Piping - Check Valves, Union, Gate Valves, Pressure Gage (q) Hydropneumatic Tanks. The pre -pressurized expansion tanks (three required) shall be a minimum of 100 -gallon capacity. The tanks shall be of steel construction with a diaphragm of material compatible with chlorinated water to prevent the water from having direct contact with the air. The tank shall be suitable for 125 psi working pressure and shall be ASME certified. Each tank shall be connected to the piping system with a union and a shut-off valve to allow removal of each tank from the system without shutting the system down. (r) Water Meters. The water meter shall be two inch (two required) with a direct reading totalizer attached to the meter. The meter shall be the disc type. Piping shall be arranged with valves both up and downstream to allow removal. Reducers, as required, shall be provided. Locate one meter on the non -potable water line from the well and the other on the potable water line from the storage tank. (s) Transfer Pump. A transfer pump shall be provided to pump the sodium hypochloride solution from the mixing tank to the chemical feed tank. (t) Chlorination (Chemical Feed) Pump. The chlorination pumps shall be suitable for pumping sodium hypochlorite at an operating pressure of 60 psi and a solution feed rate of 0.45 to 60 gpd into a water system with a minimum capacity of 60 gpm. The injection rate shall be totally adjustable from 0.45 to 60 gpd. 281 COLORADO PROJECT NO, I(CX) 70-2(187) April 10, 1992 -9e REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM Pumps shall be of the diaphragm type with both stroke and frequency .adjustable. Pumps shall be complete with circuit breaker, thermostatic circuit protection, anti -syphon valve, and chemical resistant housing. Materials in contact with the solution being pumped shall be listed as good or very good for continuous exposure on chemical compatibility charts. (u) Mixing and Chemical Feed Tank. The chlorination tanks (two required) shall be high density polyethylene with covers. Each tank shall have a nominal volume of 50 U.S. gallons and shall be mounted On an epoxy -coated steel stand a minimum of 6 inches high. Each tank shall have a graduated level gage indicating the remaining gallonage. The maximum diameter of each tank shall be 30 inches. Each cover shall have openings for suction piping and level switch. (v) Fiberglass Grating. Fiberglass grating shall be installed under the mixing and chemical feed tank and under the storage area for the carboys as shown on the plans. Grating shall be nominal i.-3/16" x 6" with a 1 inch depth. Grating shall be suitable for use in a chlorine room environment. (w) Pipe and Fittings. All water piping in the water treatment room shall be schedule 80 PVC, ASTM D1785, with compatible fittings, All valves in the pump room shall be non -rising stem gate valves, or as specified on the plans. All two-inch and smaller fittings shall be screwed. All 2- inch and larger fittings shall be flanged or if PVC, solvent welded. All pipe, fittings and tubing handling sodium hypochlorite solution shall be PVC or other suitable materials. All pipe supports shall be epoxy painted zinc -coated steel. (x) Well Pump. The well pump shall be a submersible turbine type capable of pumping a minimum of 50 gpm against a head of 100 feet. The motor shall have the minimum horsepower recommended by the manufacturer and shall not operate in the service factor range. The pump shall have a stainless steel motor and pump shaft. The pump housing shall be brass and the motor housing shall be stainless steel. The impellers and motor shall be dynamically balanced. The pump shall be provided with.a corrosion proof intake screen, ball -bearings designed to resist thrust, and a built-in check valve. Pump and motor shall be suitable for use on a potable water system and shall be NSF label. 282 COLORADO PROJECT NO. I(CX) 70-2(187) -10- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM April 10, 1992 (y) Well. The drilled well shall consist of casing, associated adapters, and casing as shown on the drawings. The well shall be a minimum of 100 feet deep and provide a minimum of 45 gpm of water continuously. The Contractor shall provide a 4 -hour pump test at 45 gpm. Records shall be maintained showing the initial water depth, water level (once per hour) during the pump test, the water level after the pump test (within 10 minutes of shut down); Water quality shall be tested by a state qualified laboratory. The well shall be installed as shown on the drawings. The well shall be sealed in accordance with the Colorado Department of Health, Water Quality Control Division requirements, and piping shall be connected with a pitless adapter. The pipe shall run from the well to the water treatment room. (z) Irrigation and Truck. Fill Pumps. The irrigation and truck fill pumps, each individually mounted in its own manway in the non -potable water storage tank, shall be of the vertical multiple stage turbine type with a bowl size capable of passing through a 4 inch NPT fitting. For maintenance purposes, the bowl and impeller of both pumps shall be the same, only the number of stages shall change, Impellers shall be of the semi -open type operating at 3,500 rpm. The pump assembly shall consist of strainer, bowls, fabricated discharge head and motor. Centerline of discharge pipe shall be 5`®0" below grade. Pump shall have anti -rachet device. Pump capacity shall be as follows: Irrigation Pump -- 25 gpm @ 175 ft. head at the irrigation controller. Truck Fill Pump -- 45 gpm @ 46 ft. head at fabricated discharge head outlet flange. Motors shall be TEFC with built-in heaters. Lockable disconnect switch; NEMA 3R, shall be provided. All non -potable water piping shall be schedule 80 PVC, ASTM D1785, solvent welded. Valves and fittings shall be compatable. (aa) Liquid Level Control System. A liquid level control system shall be mounted in both underground fiberglass tanks. The control system shall be a series of magnetically operated reed switches mounted inside a vertical tube. Switches shall be magnetically operated by a float. 283 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -11- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM Each level control shall contain a high level alarm mounted 3 inches below the top of tank; a high level well pump shut "off", 6 inches below top of tank, a well pump "on" mounted 24 inches below top of tank; a low water pump "off" switch mounted 18 inches above bottom of tank; a low water alarm mounted 12 inches above bottom of tank. (ab) Water System Control. The well pump shall be controlled by the liquid level control system. The well pump shall be controlled by the pump "on" switch in the storage tanks. The pump "on" switch will also control the position of the three-way valve in the Water Treatment Room. The NSF water storage tank shall have priority over the water storage tank (non-portable). Flow of water through the three-way valve to the NSF water storage tank shall automatically start the chlorination pump. (ac) Plumbing and Drainage Fixtures. The Landscape Service Facility building area shall be equipped with the following items, as well as those shown on plans: 1. One Floor Drains. One trapped floor drain shall be located in the Open Work area. The liquid shall be piped to the leach field, in minimum 6 inch PVC pipe. 2. Sink. One, single tub, 14 ga. type 304 stainless steel wall service sink, 25" x 22" x 12", equipped with spray nozzle, one combination (mixing) hot and cold faucet and one single cold water faucet. Cast iron 'P' trap with cleanout plug, and support brackets. A1.1 faucets to be equipped with standard hose thread spigots. The tub drain shall be tied into the comfort station septic tanks. 3 Emergency Shower. One free standing shower and eye wash basin to meet ANSI 2358.1-1981 standards. 4. Hose Bibs. Four 3/4" hose bibs with vacuum breakers shall be provided, two in the Open Work Area, one in the Water Treatment Room, and one outside adjacent to the water treatment room door. 5. Water Heater. One electric, instantaneous, water heater to provide one gallon per minute of water at 60°F temperature rise. Heater shall have two heat settings, 4.75 and 9.5 KW. Unit shall be UL listed with all required temperature and pressure safety devices. Location as shown on the plans. 284 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -12- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM Subsection 622.23 shall include the following: 622.23 Heating and Ventilation The building shall be insulated and equipped with suitable electric heating equipment. All exterior walls shall be insulated with suitable insulation, having a minimum thermal resistance value of 19. The value for the building ceilings insulation shall bad 30. The building shall be maintained at a. minimum temperature of 55 F. (a) Water Treatment Rte,. 1. One ventilation fan, manually operated from "Red" mushroom emergency pushbutton switch located near sodium hypochlorite tanks. Fan shall be capable of providing 30 air changes per hour in the water treatment room. 2 One ventilation fan, automatically operated from wall mounted thermostat. Thermostat to close $n air temperature rise with a set point range of 66°F to 95 F and positive "Off" position. Fan shall be capable of providing four air changes per hour in the water treatment room. 3. One automatic motor operated damper, with insect screen, sized for larger ventilation fan. Inlet velocity shall not exceed 600 ft./sec. Damper shall automatically open when either fan operates. (b) General Service Area. 1. Two ventilation fans, automatically operated from wall mounted thermostat. Thermostat tg close on air temperature rise with a set point range of 66 F to 95°F, adjustaqble, and positive "off" position. Fans shall each be sized to provide four air changes per hour in the open work area and secured storage area. 2. Two automatic, motor operated, dampers with insect screens. Inlet velocity shall not exceed 600 feet per second. Damper shall automatically open when its associated fan operates. COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -13- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM. Subsection 622.24 shall include the following: 622.24 Electrical Work The Contractor shall arrange for installation of electrical power. Installation costs are to be included in lump sum cost of the building. Installation of telephone system shall be included. Utilities shall be installed in the location as shown on the plans, or as directed by the Engineer. (a) The building shall be equipped with sufficient 40 watt rapid startindustrial type fluorescent lighting fixtures to provide each area or room with 25 -foot candles average maintained at the floor level. Fixtures shall be locally switched at the doors. (b) The building shall have one exterior, photocell operated wall mounted high pressure sodium lighting fixture mounted between the vehicle doors to provide security lighting. (c) Duplex 125 VAC, 2 pole, 3 -wire grounding 15 ampere receptacles mounted 18 inches above the floor shall be provided within the building, two in the Water Treatment Room and five in the General Service areas. (d) All equipment requiring electric power under this contract and specification located inside or outside the LSFB, exposed or buried, shall be completely wired, ready for operation. Perform all incidental work not indicated on the plans nor mentioned in the specifications that belong to the work described or is required for a complete system. (e) Power shall be provided to operate all equipment located in and in the general vicinity of the building. Delete Subsection 622.25 and replace with the following: 622.25 Sanitary Sewerage System (a) This work shall include all labor, materials, equipment, and services necessary for the installation of the Sanitary Sewerage System, including septic tanks, leaching field, and associated sewage piping from the comfort station, as shown on the plans and described herein. 286 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -14- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM (b) Products. 1. Septic Tank. The settling basin shall be 5 cast -in-place or pre -cast septic tanks, having a nominal volume of 1,250 gal.:tons each. The tanks shall have the approximate dimensions shown on the plans and be suitable for burial depth as required. Access manholes to the surface and vents shall be provided in each tank. Vent pipe shall be two-inch steel, ASTM A-53, galvanized. Vent pipe shall extend 2°-0" above grade and be provided with a standard vent cap. Provide access holes for each tank. 2 Distribution Dox. The distribution box (one required) shall have a minimum of one six-inch inlet and six four -inch outlets. The box shall be concrete with removable tops, suitable for burial depth as required. 3 Leach Field. The "grave. -less" chamber leach field system shall be as shown on the plans and shall meet the following: a. The chamber shall be The Infiltrator High Capacity Type, manufactured by Infiltrator Systems Inc., or equal as approved by the Engineer. b. Chamber shall be approved by the State of Colorado Health Department and local regulators and shall be approved to permit a reduction of 40 percent, or (0.6)A, for sizing the absorption area when calculated in accordance with the procedure cited in 5CCR 1003-6, Section VIII I.d. c. Chamber shall be installed in accordance with the manufacturers recommendations and all state and local health department regulations. d. Units shall be a High Density Polyethylene Structural Chamber. 287 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -15- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM e. Units shall be domed and of open bottom construction with provisions for side exit of effluent. Side exit provisions should be in such a way that does not allow entry of backfill material into the unit and maximizes unmasked surface area. f Units shall achieve an axle loading of 16,000 pounds/axle (AASHTO rating of H-10), when covered with 12 inches of compacted fill. Contractor shall provide certification by Engineer or testing laboratory. g. Units shall be placed on level raked trenches or beds. h. Units shall be constructed with an interlocking connection. i. Units shall be installed with (4) 3"-1" x 1/8" screws at each unit connection and (4) screws at each endplate connection to insure stability during the backfill operation. The chamber shall be constructed in units not exceeding 6.5 feet in length, 3 feet in width, nor 16 inches in height, and shall not exceed a weight of 35 pounds per unit. k. Individual units shall be constructed in a manner that allows for stacking or testing one on another to facilitate shipping and job site access. 1. No filter fabrics or stone shall be permitted. 4. Root Barrier. Root Barrier shall consist of time -release modules impregnated with Treflan herbicide and permanently loaded onto a permeable geotextile fabric, and shall meet the following specifications: 288 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -16- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM PROPERTY TYPICAL VALUE TEST METHOD Fabric: Unit Weight (ox./yd.2) 4.0 Tensile Strength (lbs.) 45.0 Elongation at Break (%) >70.0 Mullen Burst Strength (psi) 175.0 Puncture Strength (lbs.) 50.0 Coefficient of Permeability (cm./sec.) 3 X 10-2 Nodule: Base Diameter (in.) 7/16 Height (in.) 1/4 Weight (oz.) 0.013 Spacing (in.) 1 Total Product: Weight (oz./ft-20 (lbs./ye) Physical/Chemical Characteristics: Product: 1-1/3 3/4 ASTM D-3776 ASTM D-4632 ASTM D-4632 ASTM D-3786 ASTM D-751 MOD. ASTM D-4491 Specific Gravity >1.0 Appearance Gray Fabric w/Black Nodules Odor Aromatic Solvent Herbicide: -4 - Vapor Pressure (mm Hg) 1.03 x (10) Solubility in Water (ppm) 289 1 1COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -17- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM (c) Quality Assurance. 1. Leakage Testing. All gravity pipe shall be tested as follows: Leakage shall not exceed 200 gallons/inch/mile/hour. 2. Soil Testing and Inspection Service. The Engineer will engage soil testing and inspection service for quality control testing during earthwork operations. (d) Job Conditions. 1. Site Information. The absorption field shown on the drawing has been designed with a soil texture of fine sand, loamy sand, with a percolation rate of 6 to 15 minutes per inch and an application rate of 0.8 gallons per day per square foot. The Contractor shall provide fill as required to meet these conditions. (e) Execution. 1. General. All septic tanks shall be installed in accordance with CDOT Standard Specification 604 - Sewers, Manholes, Inlets, and Meter Vaults, and Standard Specification 603 Culverts and Sewers. a. All leach field and septic tank piping shall be installed in accordance with. CDOT Standard Specification 605 ® Subsurface Drains. b. Root Barrier shall be installed as per manufacturers recommendations for horizontal placement. Root barrier shall be placed at a minimum depth of three feet over leach field, or deeper if leach field permits. Subsection 622.27 shall include the following: 622.27 The Landscape Service Facility Building (LSFB) will be measured and paid for at the contract unit price for each under Pay Item, Storage Building. 290 COLORADO PROJECT NO. I(CX) 70-2(187) April 10, 1992 -18- REVISION OF SECTION 622 LANDSCAPE SERVICE FACILITY BUILDING, WATER TREATMENT SYSTEM, SANITARY SEWERAGE SYSTEM All work to furnish and install the Water Treatment Facility and water supply, including the well, pumps, storage tanks, and associated equipment including all plumbing from the well to the storage tanks for potable and non -potable water, from the storage tanks to the Water Treatment Facility, and from the Landscape Service Facility Building to the leach field, the main irrigation supply valve, and to the water supply entrance to the Comfort Station, shall be included in the .LSFB. The (5) 1,250 gallon septic tanks shall be paid for at the contract unit price for each under Pay Item, Septic Tank. All work for the Sanitary Sewerage System from the sewer outlet of the Comfort Station to and including the leaching field, except for the five septic tanks, shall be paid for at the contract unit price per square yard under Pay Item, Leaching Field. Subsection 622.28 shall include the following: 622.28 Basis of Payment PAY ITEM PAY UNIT Storage Building • Each Payment for driveway, curb, gutter, fence and gate shall not be included in this work but shall be paid for separately. 291 • • d:\ n o n a m e\ tt 118 7\ 04-06-92 C) 0 =- 0 1=-=---- 0 0 R• ,c � }•—•I t ) T 0 LA I-�z .., i' .— -(-...YT . 1.04/ �I 7 0 �\ o� ate.' I ( • D T ��� �1� .11► 'n s Oil II p V 1 _- �../ goo /��' _ _ Z rii a -� �! �� ��' �0 Nemo Creek I O r -i '�� 1--R -j _A I �g •�.• f ! e c' Z O O z z ❑ m Or z r--{ ` /J �J 6 ril cn F% _r_ 0 0 �.... 100 ❑ m 1N0 �-I1 O ~� co o .. 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