WPC 2QB$R ZCourierw RomanCourierCourier BoldCourier Italic@`7@HP LaserJet 4HPLAS4.PRS 4d6X@7\*"P@lr5ddd,Oed6X@`7@s4ddd,鑡d `7r5ddd,d6Nhez7HOK  3   5 ҒK`QVWtE_^YddddddddddddddddddddddddddddddddddddddddNEssEX`AT`````6=`:=`:AATT`BBs``uEssErkkAT`:"`soh`kss`!|dBoldHPLAS4.PRS 4?f\  P6G;\*"P?P2#Zr0X  X` hp x (#%'0*,.8135@8:, P age,  s5  F ooter, B , E dit. Delete the "Project Name (ftr B)" text and replace it  s5J with the name of the project (bolded) . , until you arrive at the document text.d# ,D.The Guide Specifications are being reviewed and revised. Your technical comments on any guide spec would be greatly appreciated. Also, any specs that are written "from scratch" that would benefit others could be sent to either Dion Dishong or Lori Quayle, RS110.d#  s5  DRAWING DATA REQUIRED: Drawings should include the following and any other information necessary to indicate layout and general configuration of the well: ,1.Diameter of drilled holed# ,2.Casing sizes - outside casing, inside casingd# ,3.Well screen sized# ,4.Minimum depth of outer casing and minimum depth of well screend# ,5.Limits of gravel envelope around inside casing and screensd# ,6.Limits of neat cement grout around outer casingd# ,7.Location of air line and altitude gaged# ,8.Type of cap, cover, or seal required at top of welld# ,9.Required well capacity in gallons per minute.d# Use the following standard drawings as appropriate: A. Drawing No. 02525-1: Well Construction Detailsd# ,B.Drawing No. 02525-2: Well Construction Details - Concrete Platformd# ,C.Drawing No. 02525-3: Well Construction Details - Earth Platformd# ,D.Drawing No. 02525-4: Hand Lift Pumpd# ,E.Drawing No. 02525-5: Submersible Pump Installation, Type Ad# ,F.Drawing No. 02525-6: Submersible Pump Installation, Type Bd# ,G.Drawing No. 02525-7: Stuffing Box Pump, Type Ad# ,H.Drawing No. 02525-8: Stuffing Box Pump, Type Bd# ,I.Drawing No. 13701-1: Typical Windmill Installationd# %*8)8)ttԌ s4 C REVISIONS OF THIS SECTION:  r5  CSI format, editorial changes: 8/96 Metric: Technical Update: 8/96 POINT OF CONTACT: Mary Anne Belding Phone: (303) 2369521C C*8)8)tt  w s4  `\d#HWATER SUPPLY WELLS Project Name (ftr B)` !d#T[7/96]  s4N .02525  ă  b-SECTION 02525 h*WATER SUPPLY WELLS PART 1: GENERAL 1.1 SUMMARYd# ,A.Section Includes: Requirements for rotary-drilled water wells (consolidated or unconsolidated) using conventional fluid rotary drilling or reverse circulation drilling, including record keeping, construction of the well platform, [capping of well,] [disinfection of well,] [water quality testing].d# ,B.Related Sections:d# ************************************************** DELETE EITHER 01009 OR 01010. EITHER SECTION 01330 OR 01458 MUST BE USED WHEN 01010 IS USED. ************************************************** ,General Information and Requirementsd#`Pd#MSection 01009 ,Summary of Workd#`Pd#MSection 01010 ,Government-Furnished Propertyd#`Pd#MSection 01019 ,Submittalsd#`Pd#MSection 01330 ,Certificatesd#`Pd#MSection 01331 ,Testing Laboratory Servicesd#`Pd#MSection 01458 ,Trenchingd#`Pd#MSection 02321 ,Water Distributiond#`Pd#MSection 02514 ,Minor Concreted#`Pd#MSection 03306 ,Water Well Pumpsd#`Pd#MSection 11216 ,Windmillsd#`Pd#MSection 13701 ,Well Maintenanced#`Pd#MSection 17320 1.2 DEFINITIONSd# ,A.Listed and Labeled: The terms "listed" and "labeled" as defined in the National Electrical Code, Article 100.d# 1.3 SUBMITTALSd# ,A.General: Submittals shall be according to [Section 01009 General Information and Requirements.] [Section 01330 Submittal Procedures.] [and] [Section 01331 Certificates.]d# ***************************************************** EDIT THE CERTIFICATE SUBMITTAL REQUIREMENTS BASED ON THE TYPE OF WELL (CONSOLIDATED OR UNCONSOLIDATED). IF THE SPECIFICATION IS WRITTEN FOR A CONSOLIDATED WELL, DELETE THE WELL COMPONENTS WHICH ARE NOT NORMALLY REQUIRED IN CONSOLIDATED FORMATIONS, SUCH AS INNER CASING, WELL SCREEN, AND GRAVEL FILL. ***************************************************** ,B.Certificates of Conformance: Submit three copies of written certification from the supplier of the Contractorfurnished equipment listed below to be used on this project that it conforms to the requirements of this specification section:d# ,1.` ` Casingsd#` ,2.` ` Cementd#` ,3.` ` Air lined#` ,4.` ` Air gaged#` ,5.` ` Drilling mudd#` ,6.` ` Water meterd#` ,7.` ` Screensd#` $'*''ttԌ,8.` ` Graveld#` ***************************************************** EDIT THE SUBMITTAL REQUIREMENTS BASED ON THE TYPE OF WELL (CONSOLIDATED OR UNCONSOLIDATED). IF THE SPECIFICATION IS WRITTEN FOR A CONSOLIDATED WELL, DELETE THE WELL COMPONENTS WHICH ARE NOT NORMALLY REQUIRED IN CONSOLIDATED FORMATIONS, SUCH AS INNER CASING, WELL SCREEN, AND GRAVEL FILL. ***************************************************** ,C.Drawings: Submit three copies of drawings or catalog cuts showing rotary-drilled water well components. Detail drawings or catalog cuts shall include a cross section showing the relative size, location, and spacing of the well components such as the hole size, outer casing, [inner casing,] [well screen,] [gravel filter,] air line and gage, and grout.d# ***************************************************** THE TEST HOLE AND CAPACITY TEST SHOULD BE SPECIFIED IF THERE IS A REASON TO BELIEVE THAT THE WELL MAY NOT PRODUCE THE REQUIRED YIELD AT THE DESIGN DEPTH. IF THE REQUIRED YIELD IS NOT OBTAINED, THE TEST HOLE MAY BE DRILLED DEEPER OR THE LOCATION CHANGED BEFORE THE PERMANENT WELL IS CONSTRUCTED. A TEST WELL MAY BE DELETED FROM THIS SPEC IF THE WELL IS TO BE CONSTRUCTED IN AN AREA WHERE OTHER WELLS OF SIMILAR DEPTH AND DESIGN ARE PERFORMING ADEQUATELY. HOWEVER, A DRILL LOG SHOULD BE MADE AND CAPACITY TEST SHOULD BE PERFORMED FOR ALL WELLS TO PROVIDE AN "AS BUILT" RECORD. ALSO, EDIT/DELETE IF CONTRACTOR IS NOT TO PROVIDE RECOMMENDATIONS FOR PERMANENT WELL (IF TESTING AGENCY WILL PERFORM). ***************************************************** ,D.Test Well Reports: During the drilling of the test well, maintain an accurate bore log. As a minimum, the log shall include depths, elevations, and descriptions of all formation encountered; identification of each stratum according to the Unified Soil Classification System or standard rock nomenclature, as necessary; and depths at which groundwater is encountered [and provide recommendations for permanent wells. Include with the recommendations the appropriate depth, details of construction, length and location of screens, screen openings, gravel size, grout, and an estimation of the quantity of water that can be obtained from each water-bearing stratum and from each completed well].d# ,1.` ` Soil and Rock Samples: Take and preserve soil samples each 3 m (10 feet) with a splitspoon sampler. Take and preserve rock samples each 3 m (10 feet) using standard core drilling methods. Prepare a graphic boring log to scale showing the required details.d#` ,2.` ` Submit three copies of electric log, a drillers log drawn to scale with coarseness and fineness modulus of each strata, time penetration log (time to drill through each formation), [caliper log] [natural-gamma log], and sieve analysis [to substantiate recommendations].d#` ,E.Permanent Well Field Test Reports: Submit the test reports required for test well, and also submit three field test reports for the following:d# ,1.` ` Pump test.d#` ,2.` ` Water quality analysis.d#` ,3.` ` Plumbness and alignment test.d#` ,F.Drilling Program: Within 10 calendar days after the date of receipt of notice to proceed, submit to the Contracting Officer for approval a complete and practicable drilling program. The program shall provide for orderly performance of the work and be in such form and detail as to show the following:d# ,1.` ` Sequence of drilling operations.d#` $'*''ttԌ,2.` ` The days of the week and month that work is to be performed.d#` ,3.` ` The number and length of each shift per day. The length of a shift may be extended in the field as required to avoid interrupting a drilling and testing operation.d#` ,4.` ` Number and type of rigs to be operated simultaneously.d#` ,5.` ` Plan for mud pits and disposal of waste.d#` ,d# 1.4 QUALITY ASSURANCEd# ,A.Permanent Wells Complete System: Provide each well system complete and ready for operation.d# ,B.Regulatory Requirements: Each system, including equipment, materials, installation, and workmanship shall be in accordance with EPA570/9-75-001 Manual of Water Well Construction Practices, except as modified herein. In the manual referred to, the advisory provisions shall be considered mandatory, as though the word "shall" has been substituted for the word "should" wherever it appears. Reference to the "Project Representative" and the "Owner" shall be interpreted to mean the Contracting Officer.d# ,C.Pump Listing and Labeling: Provide electrically operated pumps and components specified in this Section that are listed and labeled. d# ,1.` ` Listing and Labeling Agency Qualifications: A "Nationally Recognized Testing Laboratory" (NRTL) as defined in OSHA Regulation 1910.7.d#` ,D.Casing Labeling Requirements: Polyvinyl Chloride (PVC) plastic casing shall carry the National Sanitation Foundation (NSF) seal of approval for well casing (NSFWC).d# ,E.Standby Time: The Government may elect to perform tests in the wells or perform other work not covered in this specification section. If the tests or other work require the use of the drill rig, including a minimum two-man crew, rig time will be paid. When the Contractor is required to stand idle and unable to perform work on the well, standby time will be paid.d# 1.5 DELIVERY, STORAGE, AND HANDLINGd# ,A.Delivery: Deliver materials in an undamaged condition. d# ,B.Storage: Store materials off the ground to provide protection against oxidation caused by ground contact. Replace defective or damaged materials with new materials at the Contractor's expense.d# ,C.Moving Equipment Between Wells: Moving equipment between wells includes work of moving equipment, materials, and tools, and setting up at each well site; removing equipment, tools, and materials; and moving them to the next well site.d# 1.6 SEQUENCING AND SCHEDULINGd# ,A.Drilling Program: Follow the approved drilling program.d#:#*''ttԌPART 2: PRODUCTS 2.1 MATERIALSd# ,A.Casing: Materials specified shall be new and free from defects. No used or old material will be accepted. However, when necessary or desirable to use temporary casing, the temporary casing may be used casing, subject to the approval of the Contracting Officer. Also see Section 01019 - Government-Furnished Property.d# ***************************************************** SPECIFY METAL CASINGS WHEN MORE STRENGTH IS REQUIRED THAN PLASTIC CAN PROVIDE, OR WHEN MAXIMUM OPEN AREA FOR SCREEN DIAMETER IS REQUIRED. SPECIFY PLASTIC WHEN WATER IS CORROSIVE OR ECONOMY IS OF PRIME IMPORTANCE. ***************************************************** ,B.Steel Casing: Steel casing shall be either seamless or electric-welded black steel pipe, with either welded or threaded and coupled joints conforming to ASTM A 53 Grade B, or line pipe conforming to API 5L, either Grade A or B. Each section of steel casing shall be marked to show the diameter, standard number, weight, wall thickness; and United States manufacturer. Physical dimensions shall be as follows:d# n(STEEL WATER WELL CASING , Minimumd# Nominal External Minimum Weight per Size Diameter Wall Thickness Foot  (inches) (inches) (inches) (lb)  3 3.500 0.216 7.58 4 4.500 0.237 10.79 5 5.563 0.258 14.62 6 6.625 0.280 18.97 8 8.625 0.277 24.70 10 10.750 0.307 34.24 12 12.750 0.330 43.77 14 14.000 0.375 54.57 16 16.000 0.375 62.58 18 18.000 0.375 70.59 20 20.000 0.375 78.60 24 24.000 0.375 94.62 ,C.PVC Plastic Casing: Polyvinyl Chloride (PVC) plastic casing and couplings shall be PVC 1120 pipe conforming to ASTM F 480, with joints using solvent according to ASTM D 2564, and primer according to ASTM F656. Each section of PVC plastic casing shall include NSF listing marks to show, at a minimum, the diameter, type of material, standard number, SDR number, and United States manufacturer. Physical dimensions shall be as follows:d# &PVC WATER WELL CASING/LINER */(200 psi) 0SDR 21 , Minimumd# Nominal External Minimum Weight per Size Diameter Wall Thickness Foot  (inches) (inches) (inches) (lb)  4 4.500 0.214 1.875 5 5.563 0.265 2.870 6 6.625 0.316 4.074 8 8.625 0.410 6.884 10 10.750 0.511 10.693 12 12.750 0.606 15.042 16 16.000 0.762 23.748 p&*''ttԌ,D.PVC Casing Joints: May either be solvent-weld type, using a locking coupling, or flush-type threaded or threaded and coupled. Casing joints shall be joined watertight according to the manufacturer's recommendations. Reinforce each joint of solvent-welded pipe with a minimum of three metal screws; these screws will not protrude from the inside wall of pipe.d# ,E.Chlorine: Shall be calcium hypochlorite, with 65% minimum available chlorine.d# ,F.Sample Bags: Furnished by the Government.d# ,G.Bentonite: Granular or pellet bentonite shall be approved by the Contracting Officer.d# ,H.BioDegradable Drilling Fluid: A guarbased, organic polymer drilling fluid shall be used in water bearing zones. The material shall be certified by the manufacturer to dissolve and breakdown when dosed with chlorine.d# ,I.Drilling Foam: A drilling foam certified by the manufacturer for use with airrotary drilling rigs shall be used when specified.d# ***************************************************** SPECIFY METAL SCREENS WHEN MORE STRENGTH IS REQUIRED THAN PLASTIC CAN PROVIDE, OR WHEN MAXIMUM OPEN AREA FOR SCREEN DIAMETER IS REQUIRED. SPECIFY PLASTIC WHEN WATER IS CORROSIVE OR ECONOMY IS OF PRIME IMPORTANCE. ***************************************************** ,J.Stainless Steel Well Screen: The well screens shall be of the size shown on the Work Data Sheet. The screens shall be of wire-wound, cage-type, v-slot, all-welded construction, type 304 stainless steel. At least 95% of the screen slot openings shall be completely clean and free of burrs, frayed edges, cuttings, slag and other such materials. [Screen shall have a weld ring for attachment to the casing.] [Screen shall have a Kpacker for insertion into the casing.] [Recommend the size of screen to be approved by the Contracting Officer.]d# ,K.Polyvinyl Chloride (PVC) Well Screen: The well screens shall be of the size shown on the Work Data Sheet. The screens shall be of the continuous slot, wire-wound, PVC material. At least 95% of the screen slot openings shall be completely clean and free of burrs, frayed edges and cuttings. [Screen shall have a fastening ring for attachment to PVC casing.] [Screen shall have a Kpacker for insertion into the casing.]d# ,L.Formation Packers: [Backfill material containing gravel no larger than 3/4inch] [gravel passing a 3/8inch sieve and containing no more than 10% fines passing a No. 200 sieve] shall be used for formation packers. [Material shall be washed and disinfected with a 0.1% chlorine solution before being placed in the well.]d# ***************************************************** DELETE GRAVEL IF A CONSOLIDATED WELL IS SPECIFIED AND GRAVEL IS NOT REQUIRED. ***************************************************** ,M.Gravel Packing: [After reaching the waterbearing zone and test pumping indicates that gravel packing will be required, obtain samples of the sand formation and recommend the size and quantity of gravel packing required to the Contracting Officer for approval. Submit material samples and analyses along with the recommendation.] [Gravel packing shall be Governmentfurnished.]d# $'*''ttԌ***************************************************** THE PUMP AND MOTOR DIAMETER SHOULD BE AT LEAST 25 MM (1 INCH) SMALLER THAN THE INSIDE DIAMETER OF THE WELL SCREEN OR CASING, WHICHEVER IS SMALLER, IN ORDER TO ALLOW IT TO BE REMOVED FOR SERVICING. ***************************************************** ,N.Permanent Well Pump: Shall be an approved [submersible][, jet] [or [_____]] type with a capacity sufficient to deliver [_____] liters per min ([_____] gpm) at [_____] kPa ([_____] psi). The bearings shall be oil lubricated and the shaft shall be stainless steel. The pump shall operate on 208 volts, 60 Hz, [3] [single] phase power. The motor shall be of sufficient size to operate the pump under the maximum operating conditions without exceeding it rating. Pump shall operate automatically. Pump diameter shall not exceed [_____] mm ([_____]inches) in diameter.d# ,O.Cement Baskets: Shall be sized to fit the casing and the hole.d# ,P.Shale traps: Shall be sized to fit the casing and the hole.d# ,Q.Auxiliary Piping: Provide discharge piping to dispose of pumped water during developing and testing of well. Locate the discharge flow at a sufficient distance from each well to prevent flooding, erosion, and flow back into well.d# 2.2 EQUIPMENTd# ,A.Drilling Equipment: Shall be that required to drill wells according to the drilling method shown on the Work Data Sheet.d# 2.3 MIXESd# ,A.Grout: Shall be Type [II] [V] portland cement, water, [and] sand [and a maximum of 2 percent calcium chloride]. Portland cement shall meet the requirements of ASTM C 150 [and the calcium chloride shall meet the requirements of ASTM D 98]. Mixed grout shall be 1 part portland cement and 3 parts sand mixed with no more than 6 gallons of water per 94 pound sack of cement to form a workable mix.d# PART 3: EXECUTION 3.1 PREPARATIONd# ,A.Clearing: Limit worksite clearing to a maximum 15 m by 30 m (50 ft by 100 ft) area or as designated by the Contracting Officer.d# ,B.Site Preparation: Minimize surface disturbance at sites. Level construction sites only as necessary for drilling operations. Cut or fill slopes shall not be steeper than 4:1, unless approved otherwise.d# 3.2 WELL LOGS AND SAMPLESd# ,A.Well Log: [The Contracting Officer will furnish the Contractor with a Form 7230-2 (Well Log) and a Form 72302a (Well Log Continuation Sheet) for recording information on the well.] Keep a complete well log as required by State law, and check formations and enter the results in the log for intervals not to exceed 3 m (10 ft). The log of the well shall show material penetrated and full descriptive notes made of each stratum found by the drill and difficulties or unusual conditions met in drilling. Water-bearing strata shall be described in detail as to loose or compact material, color, and if gravel, whether it is water-worn or angular. The presence of clay shall be noted. The log$'*''tt must be kept up-to-date with the progress of the well drilling, and shall be available for inspection by the Contracting Officer during the drilling operations. [Furnish one copy of the complete log to the Contracting Officer after completion of drilling.]d# ,B.Samples: For cable-tool drilling operations, take a sample at the end of each drilling run. For other types of operations, take a cuttings sample at each apparent change in the materials penetrated, or every 10 ft, whichever is lesser. If drilling is proceeding beyond the estimated depth for the well, take samples at 5ft intervals. [The sample shall be placed in a cloth sample bag supplied by the Government. Label samples in pencil or insoluble ink with the name of the well, sample number, depth below ground surface, thickness of the stratum from which the samples were obtained, and sampling date. The samples shall be furnished to the Contracting Officer with the completed well log.]d# ,C.Additional Requirements: The Contracting Officer will furnish the Contractor a Form 7230-1 (Water Well Drilling Record) for recording information that is not included in the well log. Complete the form and return it to the Contracting Officer.d# ,D.Information for State Filing: Furnish the Contracting Officer with drilling information required by State law for filing on water wells, and prepare and submit reports required of the driller by State law.d# ,E.Electric Log: [Furnish a complete electric log indicating [resistivity] [and] [self-potential] [of formations and water bearing strata]. [The logging shall be recorded on American Petroleum Institute (API) grid, 5 inches per 100 ft.] [The United States Geological Survey (USGS) will be at the well site immediately after drilling has been completed by the Contractor, to do electronic geophysical testing within the open hole. The time needed to do the geophysical testing is minimal (approximately 24 hr.) Should USGS not arrive at the site within 2 hr following acceptance of Contractor's yield determination or final drilling, and if no yield test is required, the Contractor may begin plugging operation.]d# ,F.Gamma Ray Log: Furnish a complete gamma ray log of formations and water-bearing strata.d# ,G.Photographic Log: Furnish a complete photographic log on videotape of formations and water-bearing strata.d# 3.3 TEST WELLd# ,A.Requirements: Drill a test hole at the well site before construction of the permanent well is started. The location, size of well, and method of drilling must be approved before work is started. Test hole shall be not less than 150 mm (6 inches) in diameter and not less than [_____] mm ([_____] feet) deep. Keep accurate logs and records required.d# ,B.Casing: A temporary casing shall be used.d# ,C.Test Well Data: Do not construct the permanent well until data submitted for test hole has been analyzed and approved by the Contracting Officer. d# ,1.` ` Should the data obtained from test hole indicate unfavorable conditions, the test well shall be filled and sealed according to Article 56 of EPA 570/9-75-001 and as approved by the Contracting$' *''tt Officer. Exploration shall be continued at other locations approved by the Contracting Officer until a suitable well site is located. In the event additional test holes are required and approved, the contract price and time for completion will be adjusted in accordance with the contract. A test hole may be incorporated into the finished construction provided it meets the requirements for a finished well.d#` 3.4 PERMANENT WELL CONSTRUCTIONd# ,A.Drilling: [Enlarge satisfactory test well to] [Drill the hole] [___]mm ([___]inches) in diameter to a minimum depth [of [___]mm ([___] inches)] [required to produce the specified flow capacity]. Methods of construction shall be as approved by the Contracting Officer [and include drilling mud for conventional fluid rotary drilling or reverse circulation drilling]. Drill straight, plumb, and circular from top to bottom, from the ground surface to the [uppermost level of the waterbearing strata] [top of rock] and the bottom of the outer casing set at this elevation. The hole below the outer casing shall fully penetrate the waterbearing stratum a sufficient depth to produce the required amount of water without causing excessive velocities through the aquifer.d# ,B.Outer Casing: Install the outer casing concentrically in the drilled hole and extend the casing down to a minimum depth of [___] m ([___]feet). [Provide welded joints in accordance with AWWA C206.] [Provide threaded joints in accordance with ANSI/ASME B1.20.1.] [Fill the void between the outer casing and the drilling hole with cement grout according to AWWA A 100. Provide a grout retainer at the bottom and ensure that grout does not leak into the well. Grouting shall be done continuously and to ensure that the void is filled in one operation.d# ,C.Inner Casing: [Install the inner casing and well screens concentrically in the outer casing and drill hole. Fill the void between the outer casing and the inner casing with neat cement grout to seal the inside wall of the outer casing to the outside wall of the inner casing.] Provide centralizers at the bottom of the casing and at other critical grouting points such as zones of unsuitable water quality. Provide a suitable grout retainer at the bottom of the inner casing so that grout does not leak into the bottom of the well.d# ,D.Grout: Grout casing from the bottom upward to effectively seal the annular void. Inject grout using a tremie pipe sealed to the well casing at the surface.d# ,E.Screens: Provide sufficient screens at the water bearing layer to be developed to secure available flow. Seal the bottom of the deepest screen with a threaded or welded plug, consisting of the same material and thickness as the screen body, or a welded plate, consisting of the same material and thickness as the screen body or casing.d# ,F.Well Development: Set the casing[s] and allow the neat cement grout to harden a minimum of 72 hours prior to well development. Provide well development in accordance with Article 52 of EPA 570/9-75-001, except explosives will not be permitted. Furnish pumps, compressors, plungers, bailers, and other equipment required to fully develop the well for the maximum yield of water per meter (foot) of drawdown and to limit sand intrusion during the life of the well. Underream the sand strata to a diameter 400 mm (16 inches) greater than the outside diameter of the casing attached to the well screens. Extend the$' *''tt underream continuously through the entire depth of the water bearing strata. Developing equipment shall be of an approved type and of sufficient capacity to remove all cutting fluids, sand, rock cuttings, and any other foreign material. Pump the well free of sand, mud, drillings, and other foreign matter. Maximum sand concentration at the completion of well development shall be 2.0 ppm. The turbidity shall be less than 5 on the Jackson Turbidity Scale specified in AWWA-01. The well shall be thoroughly cleaned from top to bottom before beginning the well tests. d# ,G.Gravel Envelope: Fill the entire void between the screen and the outside wall of the underreamed hole with gravel. The gravel envelope shall extend from a point equal in distance to 2.5 times the largest diameter of the underreamed hole below the lowest screen and the same distance above the highest screen. Disinfect and place the gravel with a tremie pipe in accordance with Articles 54 and 50 of EPA 570/9-75-001. Control speed of gravel placement to prevent bridging and to allow for settlement of the gravel. Gravel placement equipment and gravel placement methods shall be approved by the Contracting Officer prior to commencement of work.d# 3.5 FIELD QUALITY CONTROLd# ,A.Water Quality Determination: During drilling, collect, and have analyzed by a Government-approved testing laboratory, representative water samples from water-bearing strata to accurately show the quality of water from each stratum. Perform water sampling in accordance with Article 45 of the EPA 570/9-75-001. Include bacteriological and physical-chemical analysis. In addition, analyze the water for any additional suspected minerals or contaminants which would make it unfit for human consumption, such as nitrate, fluoride, mercury, or any other contaminants.d# ,1.` ` After the well has been disinfected, and the 24 hour pump test run, water quality samples shall be collected from the in-place water and submitted to an approved testing laboratory for complete chemical and bacteriological analysis. Furnish additional samples as required by Contracting Officer.d#` ,B.Testing: [The Government will perform the required testing, recording, and distributing of the results.] [The Government will make arrangements for a certified independent laboratory to perform the required testing, recording, and distributing of the results.] [The Contractor shall conduct the performance and acceptance tests of the [______________________]. The Contractor shall furnish necessary equipment, labor, and materials to conduct the testing. Testing shall be conducted in the presence of the Contracting Officer.] [The Contractor shall make arrangements for a certified independent testing laboratory, according to the requirements of Section 01458 Testing Laboratory Services, to perform the required testing, recording, and distributing of the results.]d# ,C.Water Exceeds Microbiological Standards: When the laboratory analyses show that the bacteriological quality of the water does not meet State, local, or EPA standards, take check samples. When the check sample and analysis indicates bacteriological contamination, repeat the disinfection process and resample the water after disinfection (a maximum of two times).d# ,D.Water Exceeds Maximum Contaminant Levels (MCL's): When the laboratory analyses show that the water exceeds MCL's established by EPA, State, or local regulations, take another set of samples and have the$' *''tt laboratory analyze the samples for those substances. When the second set of water samples also exceeds the MCL's, the Contracting Officer will consult with the appropriate authorities to determine if the problem can be overcome and the water utilized as drinking water.d# ***************************************************** THE TEMPORARY PUMP CAPACITY SHALL BE A MINIMUM OF 160 PERCENT OF THE GUARANTEED CAPACITY RATE. ***************************************************** ,B.Pump Test: Upon completion of the permanent well, provide a temporary pump, meter, air gage, and air line in the well for measuring the flow and drawdown. The temporary pump shall have a capacity of not less than [___] cubic meter per second ([___] gallons per minute). After determining the static water level in the well, begin pumping at a rate equal to 60 percent of the guaranteed capacity rate and check the drawdown at 15 minute intervals until drawdown stabilizes. Measure drawdown using the air line method. Continue pumping at that rate for 2 hours and check the water level at 30 minute intervals. Increase pumping rate in uniform increments of 20 percent of the guaranteed capacity rate and repeat described procedure at each increment of increased rate until the capacity of the well is determined or the 160percent increment of the guaranteed capacity rate is reached. The capacity of the well shall be the flow obtained at a drawdown level 3m (10 feet) above the top of the uppermost screen. d# ,1.` ` After determining the safe maximum yield of the well, conduct a continuous 24-hour pump test at that rate and check the drawdown at hourly intervals. Provide pipe and ditches to drain the water from the well site. Submit water disposal methods to the Contracting Officer for approval. Furnish a complete written log of the pump test, showing static water level, pumping rate, and drawdown at the specified intervals. Remove air line at completion of pump test. d#` ,C.Well Plumbness and Alignment Test: Upon completion of the permanent well, provide a well plumbness and alignment test using a plummet in accordance with Article 51 of the EPA 570/9-75-001. Perform the test on the entire depth of the well. The plumb or dummy shall move freely through the entire depth of the well. The well shall not vary from the vertical in excess of two-thirds of the smallest inside diameter of that part of the well being tested per 30 m (100 feet) of depth. Correct defects in plumbness and alignment, and repeat test until the work is in compliance with contract requirements.d# 3.6 DRILLING WASTEd# ,A.Waste Disposal: Drilling waste such as drilling fluid and drill cuttings shall be removed so that wastes will not interfere with installation of the well platform and pumping equipment and will not pollute surface waters or cause contamination of the well. [Dispose of drilling waste offsite, unless otherwise authorized in writing by the Contracting Officer.] [Deposit drilling waste at a location authorized in writing by the Contracting Officer near the well site. Drilling waste shall be deposited in a pit, covered, and seeded with [à].] [Drilling waste shall be caught in a pit. Location and size of this pit will be approved by the Contracting Officer. When the drilling is completed, the original excavated material from the pit shall be mixed with the drilling waste material and machine compacted to existing natural density and approved by the Contracting Officer.]d# 3.7 DISINFECTIONd#$' *''ttԌ,A.General: After the well has been completed, including developing and testing, installation of permanent pump, or at time of tests for yield and drawdown test, whichever is later, clean and disinfect well, equipment, and material in accordance with Article 54 of EPA 570/975001 and as specified in this section.d# ,B.Interim Disinfection: When a delay of 3 or more days will occur between the completion of the well and the regularly scheduled well disinfection, provide an interim disinfection. Apply 10% of the amount of an approved disinfectant in liquid form that would be required for final disinfection to the well. Use a hose or tremie pipe of sufficient length to extend to the bottom of the well, and raise and lower the pipe during application to assure uniform distribution of the disinfectant solution throughout the well.d# ,C.Disinfection of Water Table Wells:d# ,1.` ` Dry Chlorine Compounds: Use dry chlorine compounds to disinfect water table wells. Move a doubly capped, perforated, pipe container filled with granular chlorine compound up and down the entire well bore until the material has dissolved. Add a stock solution producing a minimum of 100 ppm of available chlorine in the well at intervals from top to bottom, and agitate it to distribute the solution evenly throughout the well.d#` ,2.` ` Stock Solution: The chlorine solution used for disinfecting the well shall be of such volume and strength and applied so a concentration of at least 100 ppm of chlorine is obtained throughout the well.d#` ,D.Disinfection of Flowing Artesian Wells: Use dry chlorine compounds to disinfect flowing artesian wells. Place a doublecapped, perforated pipe container filled with a granular chlorine compound at a point on or below the top of the producing aquifer. Repeat as necessary until a minimum concentration of 100 ppm available chlorine is maintained for at least 1 hr.d# 3.8 ABANDONMENT OF THE WELLd# ,A.Abandoning Existing Wells: Abandon and seal existing wells in accordance with Article 56 of EPA 570/9-75-001 and as specified herein. Sealing shall consist of a permanent bridge neat cement seal directly above the lowest aquifer, intermediate neat cement seals between water bearing formations, and uppermost aquifer neat cement seal placed above the uppermost aquifer and the top of the well. Provide disinfected aquifer fill materials consisting of [sand and gravel between sealed layers] [as indicated].d# ,B.Abandonment Due to the Contractor's Actions: When the drilled well must be abandoned because of lost tools, damaged well, misalignment, or other causes attributed to carelessness or poor workmanship, pull casing (if installed) that can be removed. Fill the hole with grout, puddled clay or other impervious earth material according to State regulations and requirements. The Contractor shall then drill a new well within 10 ft of the original well.d# ,C.Abandonment Due to Other Causes: When the well must be abandoned because of inadequate quantity or quality of the water, or for another reason not the fault of the Contractor, pull the casing (if installed) that can be removed. Fill the hole with grout, puddled clay or other impervious earth material according to State regulations and requirements. The order to abandon the well must be in writing from the Contracting Officer.d#$' *''ttԌ,D.Casing: Casing that can be removed shall be removed. The Government will retain ownership of the casing. If the casing cannot be removed, it shall be closed with a steel cap tack welded to the casing. The name of the well, total depth drilled, static water level, if any, and the date shall be plainly and permanently marked by welding beads on the protruding part of the casing. The annulus around the casing shall be filled with grout, puddled clay or other impervious material according to State regulations and requirements.d# 3.9 SANITARY PROTECTION OF WELLd# ,A.General: Protect the well during the construction period to prevent tampering or seepage of contaminated water, petroleum products, or other contaminants into the well from the ground surface.d# ,B.Seal: When the well is completed, install a cap compression seal designed to prevent pollutants from entering the well. The watertight casing or pitless wellhead shall extend above the [well platform] [final ground level] as shown on the drawings. Seal or screen equipment that permits direct access to the well to prevent entrance of foreign matter or contaminants.d# ,C.Pitless Adapters and Pitless Units: The specified installation shall be complete including fittings and 6 ft of discharge line. Excavate around the existing casing as specified. Connect the drop pipe and horizontal discharge line to the adapter or unit according to the manufacturers' instructions. Connections shall be watertight. The horizontal discharge line shall be below the frost line.d# ,1.` ` Pitless Adapters: The outside section of the adapter shall connect onto the well casing below the frost line. The adapter shall be connected to the casing by clamp-and-gasket or by welding. The casing shall extend above natural ground a minimum of 18 inches. Cut a hole in the casing specified for the horizontal discharge line or adapter.d#` , 2.` ` Pitless Unit: Cut off or remove the upper part of the casing and connect the outside of the unit directly to the casing [______________________].d#` ,D.Grading: Slope the ground immediately surrounding the top of the well casing or pitless wellheads away from the well in all directions, as shown on the drawings.d# ,E.Correcting Contamination: If the well becomes contaminated, or water with undesirable physical or chemical characteristics enters the well due to the neglect of the Contractor, corrective work including the supplying of casing, seals, sterilizing agents, or other materials necessary to prevent contamination of the aquifers shall be performed at the Contractor's expense.d# 3.10 WELL PLATFORMd# ,A.General: Construct a [concrete] [earth] platform around the well as shown on the drawings. [Concrete shall be according to Section 03306 - Minor Concrete.] [Finish concrete with a smooth "wood float" or "broomed" finish.] The casing shall extend above the platform as shown on the drawings. Pumphouse and slab shall be constructed as indicated so as to prohibit the infiltration of surface water or precipitation into the well. The slab shall be at 1.2 m (4 feet) square by 150 mm (6inches) thick and constructed of reinforced concrete. The top of the outer casing shall extend 300 mm (12 inches) above the top of the}&*''tt slab. The top of the slab shall be at elevation [_____] or higher. The pumphouse shall be constructed on the slab and thermally insulated.d# 3.11 CLEANUPd# ,A.Requirements: Upon completion of the well construction and other incidentals, remove the debris and surplus materials resulting from the work from the jobsite.d#  PART 4: MEASUREMENT AND PAYMENT 4.1 METHOD OF MEASUREMENTd# ***************************************************** WHEN A "LUMP SUM" CONTRACT IS USED, DELETE THE TITLE PART 4: MEASUREMENT AND PAYMENT, AND BOTH ARTICLES FROM THIS SECTION. MEASUREMENT AND PAYMENT WILL BE ADDRESSED IN PART 4 OF SECTION 01009 OR SECTION 01010. WHEN NOT A "LUMP SUM" CONTRACT, SELECT APPLICABLE PHRASES; USE THE "NO MEASUREMENT" PHRASE WHEN NONE OF THE PAY ITEMS IN THIS SECTION ARE INCLUDED IN THE BID SCHEDULE. ***************************************************** ,A.Units: [The work described in this section will not be measured for payment.] [Well platforms] [pitless adapter] [pitless unit] [will be measured and paid for] [on a lump sum basis.] [per each.] No payment will be made for drilling, installing casing, removing casing, or the plugging of a well abandoned due to the Contractor's actions. Payment will be made for furnishing and installing casing for the quantity abandoned due to other causes. Payment for pulling casing and filling the hole when the well is abandoned due to other causes will be negotiated and the Contract will be modified in writing.d# 4.2 BASIS OF PAYMENTd# ***************************************************** WHEN NOT A "LUMP SUM" CONTRACT, SELECT APPLICABLE PHRASES; USE THE "NO DIRECT PAYMENT" PHRASE WHEN NONE OF THE PAY ITEMS IN THIS SECTION ARE INCLUDED IN THE BID SCHEDULE. WHEN NOT A "LUMP SUM" CONTRACT AND PAYMENT IS TO BE MADE UNDER THIS SECTION, SELECT APPLICABLE PAY ITEMS. DO NOT CHANGE PAY ITEM NUMBER. WHEN MORE THAN ONE DIAMETER OR GAUGE IS SPECIFIED FOR ANY PAY ITEM, LETTER SUFFIXES WILL BE ADDED AFTER THE PARENTHESIS OF THE ITEM NUMBER. WHEN GOVERNMENTFURNISHED PROPERTY IS SPECIFIED FOR PAY ITEMS, THE LETTER SUFFIX GS WILL BE ADDED AFTER THE PARENTHESIS OF THE ITEM NUMBER. ***************************************************** ,A.Payment: [No direct payment for the work described under this section will be made. Consideration for this item shall be included in the bid price for other scheduled items of the Contract.] [Prices and payment will be full compensation for the work described in this section. Payment will be made under:]d# ,Pay Item @@C  HPay Unitd#  ,02525(01) Disinfection of Welld#pD d#RLump Sum ,02525(10) Water Quality Testingd#pD d#RLump Sum ,02525(20) Concrete Well Platformd#pD d#RLump Sum ,02525(21) Concrete Well Platformd#p!d#VEach ,02525(30) Earth Well Platformd#pD d#RLump Sum ,02525(31) Earth Well Platformd#p!d#VEach ,02525(40) Pitless Adapterd#pD d#RLump Sum ,02525(41) Pitless Adapterd#p!d#VEach ,02525(50) Pitless Unitd#pD d#RLump Sum$'*''ttԌ,02525(51) Pitless Unitd#p!d#VEach 0,END OF SECTION*''tt =,WORK DATA SHEET V2for H "SECTION 02525 - WATER SUPPLY WELLS 1.,Estimated drilling depth:   ftd# 2.,*Hole size:   inchesd# 3.,Drilling method to be used: [Cable Tool Method] [Conventional Fluidd# Rotary Method] [Reverse Circulation Drilling Method] [Air Rotary Drilling Method] 4.,*Furnish:   ft of   inch [Sch ____] [PVC] [steel] casingd# 5.,*Install:   ft of   inch [Sch ____] [PVC] [steel] casingd# 6.,*Testing:   hrd# 7.,*Developing:   hrd# 8.,*Gravel packing depth:   ftd# 9.,Desired minimum yield:   gpmd# 10. Well screens:d# ,Material: [PVC] [Stainless Steel]d# ,Type: [Telescope] [Pipe Size]d# ,Diameter:   inchesd# ,Length:   ftd# ,Slot Size:   d# 11. Frost line depth:   ft below natural ground surfaced# 12. Flowing artesian well is [not] anticipatedd# *Use only when more than one well included in Contract. Note: When several well projects are included, the tabular format may be more appropriate. (06/11/90) P=***tt using alkalis if necessary, to remove oil, grease or joint dope. The well shall then be disinfected with a chlorinated compound. CAUTION: When calcium hypochlorite is used as the source of chlorine, it shall be dissolved or suspended in water when introduced into solvent-welded PVC pipe, since the dry chemical can react violently with solvent welding materials. Other precautions listed on the calcium hypochlorite container shall be observed. The disinfection agent shall be left in the well for a period of at least 12 hours. [After a 12-hour, or longer, contact period, the well is to be pumped to clear it of the disinfection agent.] disinfected by adding chlorine, conforming to AWWA B301, or hypochlorite, conforming to AWWA B300, in sufficient quantity that a concentration of at least 50 ppm of chlorine shall be obtained in all parts of the well. Chlorine solution shall be prepared and introduced into the well in an approved manner and shall remain in the well for period of at least 12 hours. Disinfection of well shall be in accordance with any method described in Sections A1 thru A10 of AWWA A100. After the contact period, the well shall be pumped until the residual chlorine content is not greater than 1.0 ppm. The well shall be disinfected as may be required until two consecutive samples of water are found upon test to be free from Coli Acrogenes group of organisms. Disinfect piping in accordance with AWWA C 651.