State Well Codes

Diameter of drill hole to allow for min of 1.5 in. of annular space for pressure grouting & 3 in. for using tremie pipe. Grout depth to be min of 20 ft. Grouting to take place w/in 5 days after completion of construction. Place grout from bottom to top. Sand to be of no > 2 parts by weight sand to 1 part of cement w/ no > 7 gallons of clean water per 94-lb bag. To be of neat cement, sand cement, bentonite cement mixture, or concrete. 61-58.B(76)& 61-58.2.B(7)

"All individual residential wells wells shall be disinfected upon well completion, initial installation of pump and sanitary cover. The well shall also be disinfected upon any well subsequent maintenance, repair, pump repair, pump installation, or testing. Disinfectants shall be placed in the well in order to provide a chlorine residual from 50 ppm to 250 ppm for a minimum of 4 hours before being flushed from the well. The method of chlorination shall be one that insures that the chlorine is uniformly distributed in the well. The well shall be flushed sufficiently after disinfection to remove the disinfectant and to condition the well for use."

Approved backflow prevention devices are required on all wells that utilize a chemical feed system for any purpose other than water treatment.

Conform to ANSI/ASTM F480-77 and couplings made in standard SDR. Fiberglass casing not permitted. Have minimum wall thickness to meet or exceed SDR 26, and water thickness and tolerances to meet or exceed Schedule 40 for nominal sizes 3 inches or smaller.

Joints to be electrically welded or threaded & coupled w/ heavy recessed-type couplings of steel, if casing is metal. May be driven, lowered, or installed in any other watertight and plumb manner. Permanent casing to be new, seamless, or electric-resistant welded steel, galvanized pipe, or thermoplastic pipe. To have watertight joints that are glued or threaded & coupled if plastic. To meet ASTM & be NSF approved. Well point, drive pipe, or drive shoe to prevent casing rupture. In consolidated formations, casing shall be set into formation to provide watertight seal. In unconsolidated material, casing shall be set into the first confining layer or to 20 ft, whichever is greater.

Well to be sealed w/ watertight cap or seal when it is temporarily abandoned, any well removed from service for longer than 36 months shall be permanently abandoned. Any well that acts as a source of contamination shall be repaired or permanently abandoned immediately after receipt of notice. To be filled by forced injection of grout or pouring through tremie pipe from bottom to surface in one continuous operation. At minimum, the well may be filled w/bentonite-cement, neat cement, 20% high solids sodium bentonite grout, sand, or gravel to no closer than 20 ft below ground surface. The remaining 20 ft to ground surface shall be filled w/neat cement, bentonite-cement, or 20% high solids sodium bentonite grout.

Well to be properly vented.

To be sanitary & watertight.

Base plate to form watertight seal w/ casing or pump foundation. Use potable water for priming. The pump installer shall disinfect a well subsequent to installation of a pump to the standards set forth in Appendix B.

50 ft.

50 ft.

100 ft.

20 ft., wells shall be located uphill from grazing areas whenever possible. Such wells are suggested to be analyzed for nitrate levels prior to use.

To be placed in one continuous operation. To protect casing from corrosive waters. To provide negligible movement of contaminating fluids in annular space.

Not to be detonated inside casing or liner w/o written permission from Director. In no case shall an explosive charge be dropped down a well or used to sever installed well casing or liner pipe.

All new wells shall be chlorinated for a minimum of 4 hours upon completion of the well construction and completion of the pump installation.

Air may be used to lift cuttings where bedrock is encountered w/in 10 ft. Drive shoe may be used. If using plastic casing, seal to be made w/ Jaswell seal tip, shall packer, or equal. Slurries must be used to remove cuttings when depth to bedrock is > 10 ft. To be completed w/ watertight casing to min depth of 18 ft. below surface & no < 5 ft. into bedrock. If plastic casing used, seal to be created using Jaswell seal tip, shale packer or equal.

To have an anaerobic cover. To transmit driving force to well point for driven wells.

Organic materials not to be used.

Casing should extend at least 12 in. above land surface & more if well is subject to flooding.

Should be manufactured by reputable company & be watertight.

No Standard Specified.

Annular space should be filled from bottom to top using a pipe. Annular space to be filled w/ watertight sealant such as cement-based grout or grout & clay mixture. Grout at least 30 ft. of casing into pitless adapter.

Driller should develop the well by cleaning out sand, silt, and clay from the borehole.

Should be topped with a tamper-resistant and vermin-proof, vented cap.

Casing head or pitless unit to extend minimum 12 in. above finished surface or pumphouse floor and minimum 12 in. above local surface runoff level. Ground surface to be graded to drain surface water away from well. No casing to be cut off below land surface except to install a pitless unit or during abandonment.

All wells shall have an annular seal that meets standards prior to the drilling machine being removed from the construction site. Annular seal also to cover interval occupied by pitless case from point of casing connection to land surface. Annular seal must prevent commingling or leakage of groundwater by gravity flow or artesian pressure from one aquifer to another.

No Standard Specified.

Cement grout seal not permitted w/in pitless unit or adapter sealing interval. Designed and constructed watertight. The pitless adapter or unit, including the cap or cover, pitless case and other attachments, shall be designed and constructed to be watertight to prevent the entrance of contaminants into the well from surface or near-surface sources. Pitless units shall be vented to the atmosphere. Refer to OAR 690-210-0210 if the pitless adaptor or unit is to be used in conjunction with PVC casing. Seals around pitless adapter or pitless unit installation shall be replaced with unhydrated bentonite and shall be at least 1.5 inches thick.

Landowner shall maintain in condition so not a health threat, health hazard, source of contamination, source waste, or commingling. OAR 690-215-0005

50 ft. OAR 690-210-0030

500 ft.

50 ft. (except those in or underneath a building) OAR 690-210-0030

Well identification label to be affixed to wellhead at least 6 inches above ground and permanently attached to outside of casing with stainless steel band, stainless steel rivets, or screws and must be easily readable upon inspection. Labels may not be attached to pumps, pump equipment, water delivery lines, or well caps. Number must be reported on well log when submitted and labels must be furnished by Dept. Well identification label to be destroyed once well is permanently abandoned.

High Early Strength Type III Portland Cement- 48 hrs. High-Alumina Cement- 6 hrs. Portland cement- 72 hrs. No construction within 6 hrs. of placement. OAR 690-210-0350

To be placed or forced upward from bottom in one continuous operation. OAR 690-210-0320

When used for sealing material, must meet following requirements: 1) composed of uniformly mixed slurry of Portland cement or High Early Strength Type III Portland cement and potable water, or High-alumina cement and potable water, mixed in following proportions (Type of Cement — Gallons of Water Per Sack of Dry Cement, respectively): (a) Portland Cement — 4-1/2 to 6; (b) High Early Strength Type III Portland Cement — 5-1/2 to 6-1/2; (c) High-alumina Cement — 4-1/2 to 6. Additives to increase fluidity, reduce shrinkage or control time of set may be used, expanding agents such as aluminum powder may be used at a rate not exceeding 0.075 oz/sack of dry cement. Calcium chloride should not exceed 2 lb/sack dry cement. High-alumina cement and Portland cement of any type shall not be mixed. Other types of cement not to be used w/o approval. In no case shall sand or aggregate be added to cement grout mixtures. In no case shall permanent well casing be moved or driven following placement and initial set of cement grout.

Report methods, materials used, maximum pressure exerted on formation, location of packers,yield and more. Well not to be hydrofractured w/in 20 ft. of bottom of casing. Shall not allow commingling. OAR 690-210-0065

After completion of well & after pumping equipment has been installed, equipment to be cleaned leave with a solution containing at least 50 ppm chlorine. Chlorine residual to be 25 ppm after 24 hrs. OAR 690-210-0380

Organic materials, which foster or promote undesired organic growth or have the potential to degrade water quality shall not be employed in the construction of a water supply well. This includes, but is not limited to, brans, hulls, grains, starches, and proteins. Construction must prevent the commingling or leakage from one aquifer to another.

May not be driven and may only be installed in an oversized drill hole. May only be installed after drilling is complete. May be PVC type 1120 or 1220, SDR21 (Class 200) or SDR 26 (Class 160) or greater wall thickness, meeting NSF standards and ASTM F-480 or ASTMD-2241-73 and D-1784-69. To be clearly marked by manuf w/nominal size, type plastic, SDR, ASTM designation and NSF seal. Max depth based on SDR 21 = 250 ft, SDR 26 = 100 ft. If PVC is to be used, must be protected from physical and UV damage by upper protective steel casing meeting requirements of OAR 690-210-0190, either with 1) steel casing to be min. 2' larger in diameter than PVC casing and shall overlap PVC casing. Protective steel casing shall extend ≥6 inches above top of plastic casing and be sealed ≥4 ft into ground w/in annual seal and be fitted w/lid, or 2) by use of a wellhead bunker of concrete, hard plastic, fiberglass, wood or other structurally sound material. Bunker shall completely surround well and be fitted with a lid, and will be constructed to maintain access to wellhead, or 3) other methods approved in advance by Water Resources Dept. ) Pitless adaptors or units are not recommended in conjunction with PVC casing. If a pitless adaptor or unit is to be used, the constructor should take care that the weight of the pump and pump column do not exceed the strength of the casing. Plastic joints shall be watertight, either 'bell' type, threaded, or coupling hubs. Hub couplings shall be of material meeting the specifications for plastic casings in OAR 690-210-0210. Joints shall be made by solvent cement in accordance with manuf directions. Newly assembled joints require careful handling until the initial set has taken place, which varies with the temperature and the pipe size. (See Table 210-4 for recommended initial set times).

All wells shall be securely covered to prevent any foreign substance from entering the well, including any material, which might contaminate the groundwater. The well cover must meet the requirements of OAR 690-220-0005.

Not to be used to fill, partially fill, or fall into required sealing interval during construction or completion of a well. OAR 690-210-0300

All wells to be equipped w/usable access port w/ min diameter of 0.5 inches and must be installed before drilling machine is gone from well site. Shall be capped and be minimum of 12 inches above finished ground surface or pumphouse floor. To be maintained by the landowner to prevent contamination of groundwater.

Provided annular seal meets requirements, cement grout plug to be placed by grout pipe opposite all perforations or openings in casing. Remainder of well to be filled with cement grout. If no annular seal, well to be abandoned by removing casing and filling borehole with cement grout.

If abandonment is temporary, 90 days or less, steel cap to be welded to casing w/min of 4 separate welds at least 0.5 in. in length. Steel or cast iron caps to be at least 3/16 in. thick - Oregon Administrative Rule (OAR) 690-220-0005 Temporary abandonment. Wells temporarily abandoned to be capped w/watertight seal, welded steel cap, or threaded cap. During construction to be covered see OAR 690-200-0047 Unattended wells. Permanent abandonment will have well filled completely to prevent vertical movement of water in well or annular space, and must be performed by licensed Water Well Supply Constructor. If well has identification tag, the tag shall be destroyed and not reused.

In this case, casing need not be equipped w/ vented cap if casing is properly sealed or capped.

Perform yield test.

To accompany vents.

To protect below-grade connections and must be installed below the frost line.