Header:
WISCONSIN ADMINISTRATIVE CODE
DEPARTMENT OF NATURAL RESOURCES
CHAPTER NR 811 REQUIREMENTS FOR THE OPERATION AND DESIGN OF COMMUNITY WATER SYSTEMS
SUBCHAPTER II -- SOURCE DEVELOPMENT -- GROUNDWATER
Date:
02/20/2014
Document:
NR 811.12 Wells
(1) GENERAL REQUIREMENTS. Any proposal which would result in a diversion from the Great Lakes basin requires department approval in accordance with s. 281.346, Stats. Wells shall be constructed in conformance with the follow-ing requirements:
(a) Termination above the ground surface. 1. All wells shall be terminated above the ground surface.
2. The grouted protective well casing or alternatively, the top of a pitless unit, shall be terminated above grade a minimum of 12 inches above the concrete floor of a pumphouse or enclosure.
3. The portion of the pump discharge piping for permanent wells that will contain the sampling faucets, water meter, valves and other appurtenances shall be exposed above the ground surface within a pumphouse building or enclosure that is secure, weatherproof, and has a concrete floor.
(b) Watertight construction. Permanent wells shall have watertight construction to such depth as may be required to exclude contamination. The depth shall be below the pumping water level except where exempted by the depart-ment on a case-by-case basis.
(c) Grout seal. Permanent wells shall have a grout seal surrounding the protective casing. The grout seal shall be a minimum of 1.5 inches in thickness to the depths specified in ss. NR 811.14, 811.18, 811.19, and 811.20.
(d) Outer casings. 1. All outer casings used in the construction of permanent wells shall be removed during or after the grouting process unless grouted in place with neat cement having a minimum thickness of 1.5 inches.
2. The grout level shall be retained above the bottom of the casing during removal of the casing.
3. Starter casings 10 feet in depth or less may be left in place provided that they are incorporated into the pump base in accordance with ss. NR 811.31 (1) and 811.32 (1).
(e) Minimum protective casing. All permanent wells shall have a minimum of 60 feet of grouted protective casing, wherever practicable. Continuous disinfection shall be provided for wells with less than 60 feet of grouted protective casing.
(f) Bacteriologically safe water for drilling. All wells shall be constructed using water from a known bacteriologically safe source that will not contaminate the aquifer. Untreated surface water or untested groundwater shall not be used. A detectable free chlorine residual shall be maintained in the well during drilling operations.
(g) Test wells. 1. Test wells shall be drilled for permanent wells proposed in unconsolidated formations to deter-mine geologic formation information and water quality and quantity data.
2. Test wells to be converted to permanent wells or test wells to be pumped at a rate of 70 gallons per minute or more for a period of more than 72 hours shall be approved by the department prior to their construction.
3. The department may not require test wells for replacement or additional wells drilled on the same well site unless the geology is highly variable or in locations where the formation yield, cone of depression, and water quality are not known to a high degree of certainty.
4. The department may require a test well where water quality data or geologic data for consolidated formations is not available.
(h) Flowing wells. 1. Flowing wells shall be provided with a valve to control the flow. The valve shall be throttled as much as practicable to prevent the erosion of the confining bed and to prevent waste of water. The control valve shall be closed if the flow ceases.
2. Flow to waste piping shall be metal pipe welded to the protective well casing or pitless unit a minimum of 6 inches above the pumphouse floor. The piping shall extend horizontally through the concrete pump base and include a check valve and a shut-off valve on the portion of the piping located inside the building. The piping shall terminate outside the pumphouse with a screened downturned pipe elbow and a minimum 2 pipe diameter free air break over the top of a storm sewer inlet structure or other department approved location.
3. Every practicable effort shall be made to install the grouted casing below the confining bed.
(i) Materials used as drilling aids, such as drilling muds and foam or other aids shall be compounds approved by the department. Such materials shall be NSF/ANSI Standard 61 approved as required in s. NR 810.09 (5).
(j) The department may require additional or more stringent well construction requirements on a case by case ba-sis when necessary to minimize the entrance of naturally occurring or synthetic contaminants into the well.
(2) WELL DRILLER REQUIREMENTS. All wells constructed or reconstructed after December 1, 2010, shall be con-structed or reconstructed by a well driller licensed or registered by the state of Wisconsin under ch. 280, Stats., and ch. NR 146. A licensed well driller or a registered drilling rig operator shall be on-site during all well drilling, as defined in s. NR 811.02 (77).
Note: Chapter NR 146 contains the registration requirements for well drillers.
(3) WELL CONSTRUCTION REPORTS. The well driller shall forward to the department, and send a copy to the owner, of a completed Wisconsin Well Construction Report within 30 days of the date of completion of a new well. The well driller shall forward to the department, and send a copy to the owner, of a revised Wisconsin Well Construction Report within 30 days of the date of completion of a reconstructed well. A well reconstruction report is required when a well is deepened, partially backfilled or when installing or removing well casings or screens.
(4) INTERFERENCE BETWEEN COMMUNITY WATER SYSTEM WELLS. When the department determines that a pro-posed community water system well may have a substantial effect on the water levels in one or more wells owned by a neighboring water utility, the following procedure shall be followed:
(a) The department shall provide the owner of a utility well which may be affected by the proposed well with in-formation on its location, proposed constructional features, proposed pumping rate and the anticipated volume of water to be withdrawn.
(b) If the potentially affected utility well owner wishes to object to the proposed community water system well, the owner shall inform the department in writing of the reasons for objection within 30 days of receipt of the information in par. (a).
(c) If notice of objection is filed and good cause is shown, the department may hold a public hearing at which all interested parties may present testimony to be used by the department in determining if a restriction shall be placed on the volume of water withdrawn from the proposed well or existing wells.
(5) WELL SITES. The suitability of a site for a well is dependent on geologic, hydrogeologic, and topographic condi-tions and possible sources of contamination. However, the following general requirements shall be met:
(a) Well site dimensions. For wells to serve municipal and subdivision other-than-municipal water systems, a lot or parcel of land shall be reserved for the construction of the well which has minimum dimensions of 100 feet by 100 feet. The well shall be located near the center of the lot or parcel. For non-subdivision other-than-municipal water system wells, the well shall be located a minimum of 50 feet from any property boundary. These dimensions may be modified by the department on a case-by-case basis where they are unnecessary or inadequate to protect water qual-ity. Larger well sites should be considered where necessary to provide adequate wellhead protection. A deeper depth of grouted protective well casing may be required by the department when necessary to compensate for a smaller well site parcel or as a condition of approving a variance to a separation distance to a potential contamination source listed in par. (d).
(b) Flood protection. Wells may be constructed or replaced on sites in the floodplain, as defined in s. NR 116.03 (16), outside of the floodway, as defined in s. NR 116.03 (22), provided that the pumphouse floor is 2 feet or more above the regional flood elevation as determined in s. NR 116.07 (4) and there is year round dry land access to the pumphouse. No new well may be constructed and no existing well may be reconstructed on a site in a floodway. Wells shall be located in an area accessible during the entire year. Where necessary, road improvements shall be installed to provide year round access. Wells shall be located on property owned by the water system owner or for which a long term easement or lease has been obtained. Access roads shall be on property owned by the water system owner or for which a long term easement or lease has been obtained.
Note: Refer to ch. NR 116 for floodplain and floodway requirements.
(c) Well site investigation report submittal. The owner or the owner's representative shall prepare a well site in-vestigation report, as required by s. NR 811.09 (4) (j) 1., for each well site and submit the report to the department prior to or concurrent with the request for approval of a test well or a permanent well. The report shall be submitted on forms or in a format provided by the department and shall contain sufficient information to evaluate compliance with the requirements of this chapter.
(d) Minimum separation from contamination sources. The well shall be adequately separated from potential sources of contamination. Unless a hydrogeologic investigation indicates lesser separation distances would provide adequate protection of a well from contamination or department approved treatment is installed to address the po-tential contamination concerns, the minimum separation distances shall be:
1. Ten feet between a well and an emergency or standby power system that is operated by the same facility which operates the well and that has a double wall above ground storage tank with continuous electronic interstitial leakage monitoring. These facilities shall meet the installation requirements of s. ATCP 93.260 and receive written approval from the department of safety and professional services or its designated Local Program Operator under s. ATCP 93.110.
2. Fifty feet between a well and a storm sewer main or a sanitary sewer main where the sanitary sewer main is constructed of water main class materials and joints. Gravity sanitary sewers shall be successfully air pressure tested in place. The air pressure test shall meet or exceed the requirements of the 4 psi low pressure air test for plastic gravity sewer lines found in the latest edition of Standard Specifications for Sewer & Water Construction in Wisconsin. Force mains shall be successfully pressure tested with water to meet the AWWA C600 pressure and leakage testing requirements for one hour at 125% of the pump shut-off head.
3. Two hundred feet between a well and any sanitary sewer main not constructed of water main class materials, sanitary sewer manhole, lift station, one or 2 family residential heating fuel oil underground storage tank or above ground storage tank or POWTS treatment tank or holding tank component and associated piping.
4. Three hundred feet between a well and any farm underground storage tank system or other underground storage tank system with double wall and with electronic interstitial monitoring for the system, which means the tank and any piping connected to it. These installations shall meet the most restrictive installation requirements of s. ATCP 93.260 and receive written approval from the department of safety and professional services or its designated Local Program Operator under s. ATCP 93.110. These requirements apply to tanks containing gasoline, diesel, bio-diesel, ethanol, other alternative fuel, fuel oil, petroleum product, motor fuel, burner fuel, lubricant, waste oil, or hazardous substances.
5. Three hundred feet between a well and any farm above ground storage tank with double wall, or single wall tank with other secondary containment and under a canopy; other above ground storage tank system with double wall, or single wall tank with secondary containment and under a canopy and with electronic interstitial monitoring for a double wall tank or electronic leakage monitoring for a single wall tank secondary containment structure. These installations shall meet the most restrictive installation requirements of s. ATCP 93.260 and receive written approval from the department of safety and professional services or its designated Local Program Operator under s. ATCP 93.110. These requirements apply to tanks containing gasoline, diesel, bio-diesel, ethanol, other alternative fuel, fuel oil, petroleum product, motor fuel, burner fuel, lubricant, waste oil, or hazardous substances.
6. Four hundred feet between a well and a POWTS dispersal component with a design capacity of less than 12,000 gallons per day, a cemetery or a storm water retention or detention pond.
7. Six hundred feet between a well and any farm underground storage tank system or other underground storage tank system with double wall and with electronic interstitial monitoring for the system, which means the tank and any piping connected to it; any farm above ground storage tank with double wall, or single wall tank with other secondary containment and under a canopy or other above ground storage tank system with double wall, or single wall tank with secondary containment and under a canopy; and with electronic interstitial monitoring for a double wall tank or elec-tronic leakage monitoring for a single wall tank secondary containment structure. These installations shall meet the standard double wall tank or single wall tank secondary containment installation requirements of s. ATCP 93.260 and receive written approval from the department of safety and professional services or its designated Local Program Op-erator under s. ATCP 93.110. These requirements apply to tanks containing gasoline, diesel, bio-diesel, ethanol, other alternative fuel, fuel oil, petroleum product, motor fuel, burner fuel, lubricant, waste oil, or hazardous substances.
8. One thousand feet between a well and land application of municipal, commercial, or industrial waste; the boundaries of a landspreading facility for spreading of petroleum-contaminated soil regulated under ch. NR 718 while that facility is in operation; agricultural, industrial, commercial or municipal waste water treatment plant treatment units, lagoons, or storage structures; manure stacks or storage structures; or POWTS dispersal component with a design capacity of 12,000 gallons per day or more.
9. Twelve hundred feet between a well and any solid waste storage, transportation, transfer, incineration, air curtain destructor, processing, wood burning, one time disposal or small demolition facility; sanitary landfill; any property with residual groundwater contamination that exceeds ch. NR 140 enforcement standards; coal storage area; salt or deicing material storage area; any single wall farm underground storage tank or single wall farm above ground storage tank or other single wall underground storage tank or above ground storage tank that has or has not received written approval from the department of safety and professional services or its designated Local Program Operator under s. ATCP 93.110 for a single wall tank installation. These requirements apply to tanks containing gasoline, diesel, bio-diesel, ethanol, other alternative fuel, fuel oil, petroleum product, motor fuel, burner fuel, lubricant, waste oil, or hazardous substances; and bulk pesticide or fertilizer handling or storage facilities.
Note: The department's database of contaminated properties, established in accordance with ss. 292.12 (3), 292.31 (1), and 292.57, Stats., can be found on the department's Bureau for Remediation and Redevelopment internet web site. The Bureau for Remediation and Redevelopment Tracking System (BRRTS) is an on-line database that provides information on known contaminated soil or groundwater and tracks the status of the cleanup actions. RR Sites Map is the program's geographic information system that provides a map-based system of contaminated properties in Wisconsin. The department of safety and professional services Storage Tank Database Information can be found at the department of safety and professional services web site.
(e) Well site inspection. Well sites may be inspected by a representative of the department prior to approval of plans.
(f) Ch. NR 820 compliance. For wells with a pumping capacity of 70 gallons per minute or greater, the well location shall meet the applicable requirements of ch. NR 820.
(6) WELL HEAD PROTECTION PLAN. A well head protection plan shall be provided for all new wells for municipal water systems. The owner of the municipal water system or its agent shall develop the plan. No new municipal well may be placed into service until the department has approved the well head protection plan. The plan shall include all of the following:
(a) Identification of the groundwater flow direction.
(b) Identification of the zone of influence for the well consisting of the distance to one foot of aquifer drawdown at the anticipated final pumping rate when pumpage of the well is assumed to be continuous without recharge for 30 days. The zone of influence shall be calculated using the Theis Method with or without groundwater modeling unless another method is approved by the department.
(c) Identification of the recharge area for the well. The recharge area shall be calculated using the Uniform Flow Equation or be computer modeled unless another method is approved by the department.
Note: A copy of A Template For Preparing Well Head Protection Plans For Municipal Wells, in which use of the Uniform Flow Equation is discussed, may be obtained from the department.
(d) Identification of the potential contamination sources within 0.5 mile of the well location and an assessment of the potential for the existing contamination sources within the recharge area of the well to negatively impact the well water quality. The potential contamination sources shall be summarized in a table or list including distance and direc-tion from the well site and shall also be shown on a map surrounding the well site. The table or list shall include in-formation obtained by checking the department's database of contaminated properties, established in accordance with ss. 292.12 (3), 292.31 (1), and 292.57, Stats.
Note: The department's database of contaminated properties, established in accordance with ss. 292.12 (3), 292.31 (1), and 292.57, Stats., can be found on the department's Bureau for Remediation and Redevelopment internet web site. The Bureau for Remediation and Redevelopment Tracking System (BRRTS) is an on-line database that provides information on areas of known contaminated soil or groundwater and tracks the status of the cleanup actions. RR Sites Map is the program's geographic information system that provides a map-based system of contaminated properties in Wisconsin. Information that appears on the RR program's database and GIS applications can also be obtained by contacting the regional drinking water staff person responsible for the water system. A copy of A Guide For Conducting Potential Contaminant Source Inventories For Wellhead Protection may be obtained from the department.
(e) Establishment of a well head protection area for the proposed well. The well head protection area shall en-compass, at a minimum, that portion of the recharge area equivalent to a 5 year time of travel to the well. The well head protection area may be determined by a hydrogeologic investigation.
(f) A public education program for well head protection.
(g) A water conservation program.
(h) A contingency plan for providing safe water and protecting the well from contamination based on the inventory and assessment of potential contamination sources.
(i) A management plan, which assesses alternatives for addressing potential contamination sources, describes the local ordinances, zoning requirements, monitoring program, and other local initiatives proposed within the well head protection area established in par. (e), and addresses maintaining the minimum contamination source separation dis-tances established by well siting in sub. (5) (d).
Note: A copy of Example Wellhead Protection Ordinances may be obtained from the department's Bureau of Drinking Water and Groundwater located in Madison.
(j) The well head protection plan shall be labeled with the name and signature of the person who prepared the plan, the date that the plan was signed, and the name of the company or water system which the person represents. An owner approval letter shall be submitted when required in accordance with s. NR 811.10.
(7) CASING AND LINER PIPE FOR DRILLED WELLS. (a) The protective casing shall be new prime steel pipe produced to and meeting ASTM, A 53 Grades A or B, ASTM A 106; ASTM A 589 Type I, Grade A or B, Type II, Grade A or B; or API 5L specifications. Previously used or reclaimed pipe may not be used.
(b) Each length of casing shall be legibly marked in accordance with the ASTM or API marking specification and with s. NR 812.17 (2) (d). The protective casing shall have the minimum weights and thicknesses given in Table 1.
(c) Liner pipe installed to seal off a caving zone shall be new, unused, and non-reclaimed steel pipe and shall have the minimum weights and thicknesses given in Table No. 1.
(d) Outer casings can be unmarked, used, or reclaimed pipe but shall have the minimum weights and thicknesses given in Table No. 1.
(e) All casings and liner pipe shall have additional thickness and weight if the Table No. 1 standard thickness is in-sufficient to assure reasonable life expectancy or to withstand the forces to which they may be subjected.
(f) Casing and liner pipe shall be equipped with a drive shoe when driven and centering guides when set. The loca-tions of all centering guides to be installed shall be shown on the plans or noted in the specifications, or both.
(g) Casing and liner pipe shall be assembled watertight by means of joints welded in accordance with the standard welding procedure specifications of s. NR 812.18 or by threaded couplings meeting or equivalent to the specifications listed in par. (a).
(h) For wells in which the protective casing or liner pipe to be grouted is suspended, the upper terminus of the protective casing or liner pipe shall be securely attached by welding steel bands to the outer casing or by other ap-proved methods, and the grout shall be supported on a steel ring welded to the bottom of the protective casing or liner pipe or on an approved packer attached to the bottom of the protective casing or liner pipe. The bottom of the protective casing or liner pipe may be flared out to meet this requirement.
Note: Copies of the forgoing specifications and standards are available for inspection at the central office of the department of natural resources and may be obtained for personal use from the American Society for Testing and Material (ASTM), 100 Barr Harbor Drive, PO Box C700, West Conshohocken, Pennsylvania 19148-2959, and the Amer-ican Petroleum Institute (API), 1220 L Street NW, Washington, DC 20005-4070.
Table No. 1
STEEL PIPE
SIZE DIAMETER THICKNESS WEIGHT PER FOOT
(inches) (inches) (inches) (pounds)
External Internal Plain Ends With Threads
(calculated) and Couplings
(nominal)
6 id. 6.625 6.065 0.280 18.97 19.18
8 8.625 7.981 0.322 28.55 29.35
10 10.750 10.020 0.365 40.48 41.85
12 12.750 12.000 0.375 49.56 51.15
14 od. 14.000 13.250 0.375 54.57 57.00
16 16.000 15.250 0.375 62.58 65.30
18 18.000 17.250 0.375 70.59 73.00
20 20.000 19.250 0.375 78.60 81.00
22 22.000 21.000 0.500 114.81
24 24.000 23.000 0.500 125.49
26 26.000 25.000 0.500 136.17
28 28.000 27.000 0.500 146.85
30 30.000 29.000 0.500 157.53
32 32.000 31.000 0.500 168.21
34 34.000 33.000 0.500 178.89
36 36.000 35.000 0.500 189.57
(8) CONCRETE WALL CASING. Concrete wall casing shall meet all of the following requirements:
(a) Be used only in dug wells and collectors.
(b) Be reinforced and at least 6 inches thick.
(c) Be poured in one operation, if possible.
(d) Not have a construction joint within 10 feet of the original ground surface.
(9) PACKERS. Packers shall be of a material that will not impart taste, odors, toxic substances or bacterial contam-ination to the water in the well. Lead packers may not be used.
(10) SCREENS. Screens shall meet all of the following requirements:
(a) Be constructed of stainless steel which will not be damaged by chemical action of groundwater, disinfection chemicals, or future cleaning operations.
(b) Have size of openings based on sieve analysis of the aquifer and gravel pack materials.
(c) Be designed to have an entrance velocity that does not exceed 0.1 feet per second under normal operating conditions.
(d) Be installed and have pumping equipment designed so that exposure of the screen above the pumping level will not occur during normal operation.
(e) Be provided with a bottom plate of the same material as the screen.
(11) BLASTING. Approval shall be obtained from the department prior to blasting within a well. Information re-garding the procedure, number, size and location of charges shall be submitted to the department in writing.
(a) Blasting shall be conducted under the supervision of a licensed well driller and a blaster licensed by the de-partment of safety and professional services under s. SPS 305.20.
(b) No blasting may occur within 100 feet of the grouted protective casing unless specific information is submitted for department approval that justifies the use of low strength prima-cord or charges between 50 and 100 feet of the grouted protective casing if necessary to maintain the production capacity or water quality of a well with a limited length of open drillhole.
(c) All material dislodged during the blasting shall be removed from the well.
(d) Proper safety measures shall be employed to protect the workers and surrounding structures.
(e) The department's regional drinking water staff person shall be given at least 48 hours notice prior to the date and time of the proposed blasting work.
(f) Following the completion of the blasting procedure, the well shall be thoroughly disinfected and pumped to waste, and safe bacteriological water samples shall be collected according to the requirements of s. NR 810.09 (4).
(g) The owner or an authorized representative shall submit a written report to the department within 30 days of the date of completion of the blasting and subsequent pumping of the well that includes the static and pumping water levels, gallon per minute pumping rate and specific capacity of the well both before and after the blasting, and the results of any testing for chemical or physical properties for which the well may have been blasted, if applicable.
(12) CHEMICAL CONDITIONING. Approval shall be obtained from the department prior to chemical conditioning of a well. Information regarding the method proposed, equipment, chemicals, testing for residual chemicals, disposal of waste and inhibitors to be used shall be submitted to the department in writing.
(a) The department's regional drinking water staff person shall be given at least 48 hours prior notice prior to the date and time of the proposed chemical conditioning work.
(b) Chemical conditioning, with the exception of batch chlorination, shall be performed by or under the supervi-sion of a licensed well driller.
(c) All chemicals used in conditioning shall be NSF/ANSI Standard 60 approved for use in potable water as required per s. NR 810.09 (1) (c) unless an alternative chemical is approved by the department.
(d) Acid treatment shall include pH monitoring of nearby private or public wells, use of an inhibitor to protect the metal portions of the well and pump, complete removal of the acid from the well, neutralization of the spent acid, and proper disposal of the spent acid.
(e) The resident project representative shall closely supervise the discharge of chlorinated water. In no case may water with a measurable total chlorine residual content be discharged to a surface water. Suitable barriers, aeration or chemical dechlorination shall be provided when discharging chlorinated water to a surface water or a storm sewer connected to a surface water to ensure the water discharged does not contain a measurable chlorine residual.
(f) Following the completion of the chemical conditioning procedure, the well shall be thoroughly disinfected, pumped to waste and safe bacteriological water samples shall be collected according to the requirements of s. NR 810.09 (4).
(g) The owner or an authorized representative shall submit a written report to the department within 30 days of the date of completion of the chemical conditioning and subsequent pumping of the well that includes the static and pumping water levels, gallon per minute pumping rate and specific capacity of the well both before and after chemical conditioning, and the results of any testing for chemical or physical properties for which the well may have been chemically conditioned, if applicable.
(13) OTHER METHODS OF WELL RECONDITIONING. Approval shall be obtained from the department prior to per-forming any other type of reconditioning procedure, including hydrofracturing and impulse generation techniques. The requester shall submit written information regarding the procedure, the equipment, materials, chemicals and pressures to be used, and the disposal of waste to the department for approval.
(a) Hydrofracturing. Hydrofracturing procedures shall meet the following requirements:
1. The department's regional drinking water staff person shall be given at least 48 hours notice prior to the date and time of the proposed hydrofracturing work.
2. Hydrofracturing shall be performed by or under the supervision of a licensed well driller.
3. Clean washed inert, nontoxic material such as sand may be added to the water for the purpose of holding the joints and fractures open after the pressure is reduced.
4. When a well is to be hydrofractured within 100 feet of any existing bedrock well, the well driller shall notify the existing well owner or owners and the department's regional drinking water staff person of the forthcoming hydro-fracturing operation at least 48 hours prior to the commencement of the hydrofracturing operation.
5. The upper packer may not be placed at a depth closer than 20 feet below the bottom of the casing.
6. Following the completion of the hydrofracturing procedure, the well shall be thoroughly disinfected, pumped to waste, and safe bacteriological water samples shall be collected according to the requirements of s. NR 810.09 (4).
7. The owner or an authorized representative shall submit a written report to the department within 30 days of the date of completion of the hydrofracturing and subsequent pumping of the well that includes the static and pumping water levels, gallon per minute pumping rate and specific capacity of the well both before and after the hydro-fracturing, and the results of any testing for chemical or physical properties for which the well may have been hydro-fractured, if applicable.
(b) Impulse generation. Impulse generation procedures shall meet the following requirements:
1. The department's regional drinking water staff person shall be given at least 48 hours notice prior to the date and time of the impulse generation work.
2. Impulse generation procedures shall be performed by or under the supervision of a licensed well driller.
3. A report shall be submitted to the department that identifies the impulse method to be used, the means of generating the impulse, the number of passes, the depths in the open drillhole or well screen that the procedure will be started and stopped, the psi strength of each impulse, and the number of impulses per foot. The report shall also include information on all the gases to be used and details of any chemical addition to be performed along with the impulse generation procedures, including the chemicals to be used, the reason for using the chemicals, the strength of each chemical as applied, the means to be used to inject the chemicals, and how the chemicals will be neutralized and disposed of. All chemicals used shall have NSF/ANSI Standard 60 approved for use in potable water as required per s. NR 810.09 (1) (c).
4. Impulse strength shall be maintained low enough to prevent structural damage to well casings, grout, and screens.
5. Following the completion of the impulse generation work, the well shall be thoroughly disinfected, pumped to waste, and safe bacteriological water samples shall be collected according to the requirements of s. NR 810.09 (4).
6. The owner or an authorized representative shall submit a written report to the department within 30 days of the date of completion of the impulse generation and subsequent pumping of the well that includes the static and pumping water levels, gallon per minute pumping rate and specific capacity of the well both before and after the impulse generation, and the results of any testing for chemical or physical properties for which the well may have been treated with impulse generation, if applicable.
(14) GROUTING REQUIREMENTS. (a) Grout types and specifications. 1. Neat cement grout shall be ASTM C150, Type I or API-10A, Class A Portland cement and water from a known bacteriologically safe and uncontaminated source with not more than 6 gallons of water per sack (94 lbs.) of cement. A mud balance shall be used to measure the grout density. Additives, including bentonite, to increase fluidity, reduce shrinkage or control time of set may be used only with prior department approval. No more than 4.7 pounds of powdered bentonite, a maximum of 5%, may be added to each 94-pound sack of cement. When bentonite is added, the volume of water shall be increased. When bentonite is added, a pressurized mud balance shall be used to measure the grout density. Bentonite mixed with neat cement grout shall comply with Table No. 2.
Table No. 2
ALLOWABLE NEAT CEMENT -- BENTONITE GROUT MIXTURES
% bentonite added per 94-lb Maximum gal of water per
sack of cement 94-lb of cement
0% (0.00 lbs) 6.00
1% (0.94 lbs) 6.04
2% (1.88 lbs) 7.05
3% (2.82 lbs) 7.47
4% (3.76 lbs) 7.93
5% (4.70 lbs) 8.42
ALLOWABLE NEAT CEMENT -- BENTONITE GROUT MIXTURES
% bentonite added per 94-lb Minimum density of
sack of cement bentonite/grout mix in lbs/gal
0% (0.00 lbs) 15.02
1% (0.94 lbs) 15.00
2% (1.88 lbs) 14.40
3% (2.82 lbs) 14.20
4% (3.76 lbs) 14.00
5% (4.70 lbs) 13.80
ALLOWABLE NEAT CEMENT -- BENTONITE GROUT MIXTURES
% bentonite added per 94-lb Volume of bentonite/grout
sack of cement mix in ft3/sack of cement
0% (0.00 lbs) 1.28
1% (0.94 lbs) 1.29
2% (1.88 lbs) 1.43
3% (2.82 lbs) 1.49
4% (3.76 lbs) 1.56
5% (4.70 lbs) 1.63
(Bentonite table information provided by the Halliburton Co.)
2. Sand cement grout may be used for annular openings greater than 3 inches. The mixture may not exceed 2 parts by weight of sand to one part of ASTM C150, Type 1 or API-10A, Class A Portland cement and not more than 6 gallons of water from a known bacteriologically safe and uncontaminated source to each 94-pound sack of cement.
3. Concrete grout may be used for annular openings greater than 6 inches. The concrete shall contain not less than 6 sacks of cement per cubic yard and not more than 6 gallons of water from a known bacteriologically safe un-contaminated source to each 94-pound sack of cement. The gravel size may not exceed 0.75 inch. The volumetric ratio of either gravel or sand to cement may not exceed 2.5 parts to one part. Wisconsin department of transportation grade A concrete is also acceptable.
(b) Grouting procedures. 1. All grout shall be placed from the bottom of the annular opening to the surface in one continuous operation. Grouting methods that involve forcing a measured quantity of grout down the inner casing by a plug, such as the Halliburton method, shall not be used. When a conductor pipe in the annular opening is used, the conductor pipe shall meet the material requirements of subd. 8. and shall be submerged in the grout during the entire operation. For grout depths in excess of 100 feet, a pump shall be used to inject the grout.
2. A sufficient annular opening shall be provided to permit a minimum of 1.5 inches of grout around the protective casing, grouted liner pipe, or outer casing when it is intended to grout the outer casing in place, including couplings, if used.
3. Any materials used as drilling aids shall be removed from the annular opening prior to grouting.
4. Prior to grouting through creviced formations, bentonite or similar approved materials shall be added to the annular opening in the manner indicated for grouting and circulated until the bentonite or other approved material flows to the ground surface.
5. Grout shall be allowed to overflow from the annular opening until such time as the density is the same as that of the grout being placed. The specifications shall outline the method to be used to check the grout density and equipment shall be available on site to determine grout density.
6. Standby grouting equipment for grouting annular openings, including a backup grout pump and tremie pipe meeting the material requirements of subd. 8., shall be on site during the grouting of all wells.
7. The grout level shall be maintained above the bottom of any outer casing during the withdrawal procedure.
8. Grout conductor, or tremie, pipes shall be metal pipe or a rubber-covered, fiber or steel braided, reinforced hose with a minimum pressure rating of 300 psi. Plastic pipe, including PVC pipe, shall not be used as a grout conductor pipe.
9. The conductor pipe shall be completely withdrawn from the well prior to flushing excess grout from the con-ductor pipe when grouting down the annular space or shall be disconnected from the grout shoe or street elbow prior to flushing excess grout when grouting within the casing.
(c) Centering guides. Centering guides shall be installed on the protective casing in a manner to permit unob-structed flow and uniform thickness of grout within the annular space.
(d) Grout curing. Drilling operations or other work in the well, including development, may not be performed within 72 hours after the grouting of casings or liners. If the department approves the use of quick-setting cement, this period may be reduced to 24 hours. Use of quick setting cement shall be clearly indicated in the specifications sub-mitted to the department.
(15) PLUMBNESS AND ALIGNMENT REQUIREMENTS. (a) Every well constructed in rock and all screened wells greater than 100 feet in depth shall be tested for plumbness and alignment by the method outlined in AWWA Standard A100 in effect at the time of well construction or by an equivalent method. The test method shall be clearly stated in the specifications.
Note: A copy of the AWWA standard is available for inspection at the central office of the department of natural resources and may be obtained for personal use from the American Water Works Association, 6666 West Quincy Ave., Denver, Colorado 80235-3098.
(b) Variance from the vertical of two-thirds the smallest inside diameter of that part of the well being tested per 100 feet of depth to the depth of the pump setting plus 25% may not be exceeded. Also, the well shall allow free pas-sage of a 40-foot section of pipe or a dummy to the depth of the pump setting plus 25%. The outside diameter of the pipe or dummy used may not be more than 1/2 inch smaller than the diameter being tested.
(c) The department will not approve installation of well pumps in wells with kinks and bends which prevent setting a line shaft vertical turbine pump to the desired pump setting plus 25% unless the owner accepts the installation in writing.
(d) A summary and evaluation of the test results shall be submitted to the department prior to permanent pump approval for municipal wells and prior to the department approving the well to be placed in service for oth-er-than-municipal community public wells.
(16) YIELD AND DRAWDOWN TEST. (a) A yield and drawdown test is required. The method to be used shall be clearly indicated in the plans and specifications.
(b) The yield and drawdown test shall be performed on every municipal or subdivision well for a period of at least 12 consecutive hours. For non-subdivision other-than-municipal water system wells, the yield and drawdown test shall be performed for a period of at least 4 consecutive hours. In any case, the test shall be performed at a rate no less than the anticipated pumping capacity and for the duration necessary for the water level to stabilize at the anticipated pumping capacity.
(c) The test shall include pumping a minimum of 4 hours at a rate equal to the capacity anticipated for the per-manent well pump.
(d) Water depth measurements shall be made at a frequency sufficient to evaluate the production efficiency and recovery rate of the well.
(e) All of the following data regarding the yield and drawdown test shall be submitted to the department:
1. Date and time the test was started.
2. Static water level immediately prior to starting the test.
3. Gallon per minute pumping rate.
4. Drawdown in feet during the test.
5. Date and time the pumping water level was measured.
6. Specific capacity in gpm/ft.
7. Recovery water levels including date and time measured.
8. Depth of pump setting.
9. Drawdown and recovery measurements from any observation or monitoring wells monitored during the test pumping including date and time measured.
10. Elevation of the reference point of measurement of the water level data at each monitoring point.
(f) In addition, representative samples of the well water shall be collected as required by subs. (19) and (20) and the laboratory results shall be submitted directly to the department in a department approved electronic format. The laboratory results of any exploratory or investigative water quality analyses shall be submitted to the department on paper lab forms.
(17) GEOLOGICAL DATA. (a) Formation samples shall be collected from all new test wells and final wells and from deepening of existing wells at 5-foot intervals and at each pronounced change in geologic formation. The formation samples shall be submitted to the Wisconsin State Geological and Natural History Survey, 3817 Mineral Point Road, Madison, Wisconsin 53705, in collection bags provided by the survey or in equivalent plastic bags. The formation depths sampled shall be clearly and permanently marked on each bag.
(b) Geological data shall be recorded on the completed Well Construction Report form submitted to the depart-ment.
(18) CAPPING REQUIREMENTS. (a) Wells in which no pump is installed shall be capped by welding a steel plate to the top of the casing to form a watertight and airtight seal.
(b) During construction, a temporary means of capping or covering the well shall be provided to prevent debris or any contaminants from entering the well or any annular space.
(19) BACTERIOLOGICAL QUALITY. Every new, modified, or reconditioned groundwater source shall be disinfected during or after installation of the pumping equipment. Representative samples for bacteriological analysis shall be collected as required in s. NR 810.09 (4).
(20) CHEMICAL QUALITY. Every new well shall be sampled for chemical quality. Reconditioned or reconstructed wells shall be sampled for chemical quality in cases where changes in water quality may occur. The samples shall be representative of the well water and collected and analyzed for the parameters indicated in the department's approval letter for the well construction, reconditioning or reconstruction. The samples shall be collected near the end of the test pumping period after the well construction, reconditioning, or reconstruction has been completed and where applicable, the well developed. Where not existing, a smooth end sampling faucet shall be installed on the test pump discharge piping at a location suitable for the collection of water samples for volatile parameters and a suitable throt-tling device shall be provided on the pump discharge piping to facilitate sample collection. The samples shall be sub-mitted to a laboratory certified by the state of Wisconsin. Prior to collection of the samples, the department shall be provided with a detailed description of the sampling protocol for each parameter. Wells that do not meet the primary drinking water standards of ch. NR 809 may not be placed into service unless adequate treatment is provided in ac-cordance with. s. NR 811.04.
(21) OBSERVATION WELLS AND TEST WELLS. (a) Observation wells, monitoring wells, test wells, treatment wells or other wells constructed as part of the water system shall be constructed in accordance with the requirements of this chapter for permanent community wells if they are to remain in service after completion of construction of the com-munity well and if they are located on the well site. When taken out of service these wells shall be abandoned in ac-cordance with s. NR 811.13. Temporary or permanent observation wells, monitoring wells, test wells, treatment wells, or other wells constructed off the well site shall meet the construction and abandonment requirements of ch. NR 141, 812, or this chapter.
(b) The wells shall be protected and secured at the upper terminal to preclude entrance of foreign material and minimize the potential for vandalism. The wells to remain in service shall be provided with locking covers.
(c) Specifications documenting the methods and materials for the temporary abandonment of test wells or test borings to be converted into final wells shall be submitted to the department for review and approval.
|