California Water Well Standards, DWR Bulletin 74 ... - County of Glenn

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B. c. E.Over~um~ing and Pum~ Surging. Overpumping and surging may not be suitable for developmentof wells producing large amounts of sediment because of the potential for clogging orjamming of pumps.Air Devel°l!ment. Some air development methods are not acceptable for monitoring wells tobe used for sensitive water-quality determinations.D. Water Jetting. Water used in jetting operations shall be free of pollutants and contaminants.Water-jetting methods are not always acceptable for monitoring wells used for sensitive waterqualitydeterminations.Chemical Develo~ment. Extreme care shall be exercised in the use of chemicals for monitoringwell development. It is often unacceptable to use chemicals for developing monitoring wellsto be used for water-quality determinations. Chemicals introduced for development shall becompletely removed from the well, filter pack, and water-bearing strata accessed by the wellimmediately after development operations are completed.The various methods described above are sometimes used in combination.Section 14. Rehabilitation and Repair of Monitoring Wells.For the purpose of these standards, "well rehabilitation" includes the treatment of a well to recover loss inyield caused by incrustation or clogging of the screen, filter pack, and/or water-bearing strata adjoining thewell. Well rehabilitation methods that may, in certain cases, be acceptable for monitoring wells includemechanical surging, backwashing or surging by alternately starting or stopping a pump, surging with air, waterjetting, sonic cleaning, chemical treatment, or combinations of these.Rehabilitation methods shall be performed with care to prevent damage to the well and any barriers that serveto restrict the movement of poor-quality water, pollutants, or contaminants. Chemicals used for rehabilitationshall be completely removed from the well, filter pack, and water-bearing strata accessed by the wellimmediately after rehabilitation operations are completed. Chemicals, water, and other waste shall be disposedof in accordance with applicable federal, State, and local requirements. The enforcing agency should becontacted regarding the proper disposal of waste from rehabilitation operations.Rehabilitation methods should be compatible with the use of the monitoring well. Special care should begiven to the selection of rehabilitation methods for water-quality monitoring wells.Materials used for repairing well casing shall meet the requirements of Section 12 of these standards.Section 15. Temporary Cover.The well or borehole opening and any associated excavations shall be covered at the surface to ensure publicsafety and to prevent the entry of foreign material, water, contaminants, and pollutants whenever work isinterrupted by such events as overnight shutdown, poor weather, and required waiting periods to allow settingof sealing materials and the performance of tests. The cover shall be held in place or weighted down in sucha manner that it cannot be removed except by equipment or tools.-49-
Part III. Destruction of Monitoring WellsSection 16. Purpose of Destruction.A monitoring well or exploration hole subject to these requirements that is no longer useful, permanentlyinactive or "abandoned" must be properly destroyed to:(1) Ensure the quality of ground water is protected, and,(2) Eliminate a possible physical hazard to humans and animals.Section 17. Definition of "Abandoned" Monitoring Well.A monitoring well is considered "abandoned" or permanently inactive if it has not been used for one year,unless the owner demonstrates intention to use the well again. In some cases regulatory agencies may requirethat an inactive monitoring well be maintained for future use.In accordance with Section 24400 of the California Health and Safety Code, the monitoring well owner shallproperly maintain an inactive well, as evidence of intention for future use, in such a way that the followingrequirements are met:"(1) The well shall not allow impairment of the quality of water within the well and ground waterencountered by the well.(2) The top of the well or well casing shall be provided with a cover, that is secured by a lock orby other means to prevent its removal without the use of equipment or tools, to preventunauthorized access, to prevent a safety hazard to humans and animals, and to prevent illegaldisposal of wastes in the well. The cover shall be watertight where the top of the well casingor other surface openings to the well are below ground level, such as in a vault or below knownlevels of flooding. The cover shall be watertight if the well is inactive for more than fiveconsecutive years. A pump motor, angle drive, or other surface feature of a well, when incompliance with the above provisions, shall suffice as a cover.(3) The well shall be marked so as to be easily visible and located, and labeled so as to be easilyidentified as a well.(4) The area surrounding the well shall be kept clear of brush, debris, and waste materials."Section 18. General Requirements.All permanently inactive or "abandoned" monitoring wells and exploration holes subject to these requirementsshall be properly destroyed. The purposes of destruction are to eliminate the well structure and borehole asa possible means for the preferential migration of poor-quality water, pollutants, and contaminants; and, toprevent a possible hazard to humans and animals.. 8)-50-8i
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--1#~Water wells .1Cathodic protect
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. ~~Bulletin 74-81)N. KennedyResour
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~vState of CaliforniaPETE WILSON, G
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~ viiForewordOrganization.TABLE OF
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~ ix(4) Glass Fiber Reinforced Resi
Page 12 and 13: E~B. Sealing Conditions. 421. Tempo
Page 14 and 15: ~CATHODIC PROTECTION WELL STANDARDS
Page 16 and 17: 5.~Introduction:Figure 1.Years DWR
Page 19 and 20: GENERAL INTRODUCTIONImproperly cons
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Page 26 and 27: ~STANDARDSPart I. GeneralSection 1.
Page 28: ~B. c.-13-Many variables are involv
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Page 34 and 35: d. ~c.water shall be used if less s
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Page 38 and 39: -23-otherwise approved by the enfor
Page 40 and 41: Thermoplastic well casing that may
Page 42 and 43: ~.Introducing.Combinationsspecifica
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Page 47: Advances in analytical and environm
Page 50 and 51: Nested monitoring wells consist of
Page 52 and 53: c.STANDARDSPart I.GeneralSection 1.
Page 54 and 55: 1.Part II.Monitoring Well Construct
Page 56 and 57: 1. 3.casing shall in turn be at lea
Page 58 and 59: c.Casing spacers shall be designed
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Page 66 and 67: 3. 5. E.freefall only where the int
Page 69 and 70: INTRODUCTIONMost wells in Californi
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Page 85 and 86: E.these standards, or standards ado
Page 88 and 89: ~APPEN DIX ADefinition of Terms-A m
Page 91: National Association of Corrosion E
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California Water Well Standards, DWR Bulletin 74 ... - County of Glenn

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