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

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The protective anodes of a cathodic protection well usually corrode away with time. Thus a cathodicprotection well's anodes determine the well's useful life. Anodes are usually designed tQ last 15 to 20 years.There has been an increasing tendency to construct cathodic protection wells with large diameter vent pipeor casing so that anodes can be replaced through the casing. Anode replacementhrough casing eliminatesthe need to drill replacement wells when anodes have been expended..Corrosion Coordinating CommitteesSerious electrical interference problems can occur where cathodic protection networks criss-cross one anotheror are too close to one another. Also, stray currents produced from.electrical transmission lines and otherequipment can sometimes interfere with the operation of cathodic protection systems. Interference problemsare usually most pronounced in urb;an areas.Corrosion control coordinating organizations have been formed in areas of California to overcome systeminterferences and other problems. Most organizations are affiliated with or are chapters of the NationalAssociation of Corrosion Engineers.Corrosion control organizations represent the majority of utilities and other groups that install cathodicprotection devices, including cathodic protection wells. Organization members coordinate the installation andoperation of cathodic protection facilities with the goal of minimizing problems of electrical interference.Four organizations that deal with Central and Southern California, are:.SouthernCaliforniaThe Southern California Cathodic Protection Committee is a formal committee covering all of SouthernCalifornia south of San Luis Obispo, Kern, and Inyo counties, except San Diego County..SanDiego CountyThe San Diego County Underground Corrosion Control Committee is an informal organization that dealswith the San Diego area..CentralCaliforniaThe Central California Cathodic Protection Committee is a formal committee covering all of CentralCalifornia plus Sacramento Valley counties, and western Sierra Nevada mountain counties south of PlumasCounty..SanFrancisco Bay AreaThe activities of the two committees that formerly covered the San Francisco Bay Area have been assumedby the San Francisco Section of the National Association of Corrosion Engineers. The committees weredisbanded in 1985.No coordinating organizations function in coastal counties north of San Francisco or in the northeastern partof the State..Unfortunately, not all who install and operate cathodic protection facilities work with a corrosion coordinatingorganization. Those not associated with an organization are usually individuals or local agencies that aresometimes unaware of the existence of other installations. Non-coordinated facilities can seriously interferewith one another electrically.-62-
Need for Cathodic Protection Well StandardsCathodic protection wells, along with other types of wells, can allow ground water quality degradation to occur.Improperly constructed or destroyed cathodic protection wells can constitute a preferential pathway for themovement of poor-quality water, pollutants, and contaminants. Cathodic protection wells constructed withgravel backfill to land surface are particularly conducive to the movement of poor-quality water, pollutants,or contaminants.Water and electrolytes are sometimes introduced into cathodic protection wells through vent pipes, or gravelfill in the annulus, to keep wells functional where natural electrolytes are lacking. Such a practice could beconsidered "waste disposal" and may be illegal if poor-quality water is used.Permanently inactive cathodic protection wells pose a threat for the movement of poor-quality water,pollutants, and contaminants, and should be properly destroyed. Permanently inactive cathodic protectionwells are a threat to ground water quality because they become dilapidated with time, are sometimes forgotten,and are sometimes used for waste disposal.Many cathodic protection wells have small diameter vent pipes that prevent entry by persons and most animals.However, large vent pipe sizes can pose a serious safety threat if left open at land surface.History of Cathodic Protection Well StandardsThe California Legislature enacted legislation in 1949 directing the California Department of Water Resourcesto develop recommended water-quality protection standards for the construction and destruction of wells. TheLegislature amended the Water Code in 1968 to require standards for cathodic protection wells.Cathodic protection well standards for California were first published in 1973 as DWR Bulletin 74-1, CathodicProtection Well Standards: State of California. Standards presented here replace those contained in Bulletin74-1. Additional discussion on the history of well standards is contained in the "Introduction" section of thissupplement (Bulletin 74-90) and Bulletin 74-81, Water Well Standards: State of California.Scope of StandardsThe following are recommended minimum standards for construction, alteration, maintenance, and destructionof cathodic protection wells in California. They only serve as minimum guidelines toward ensuring cathodicprotection wells do not constitute a significant pathway for movement of poor-quality water, pollutants, andcontaminants. These standards do not ensure a cathodic protection well will perform its corrosion protectionfunction adequately.The functional requirements of cathodic protection wells may conflict with the application of certain standardsfor the protection of water quality. Consequently, some compromise has been made between well functionand resource protection in the development of these standards.Organization of StandardsThese standards are arranged in a format similar to the Water Well Standards. Since many of the standardsthat apply to water wells also apply to cathodic protection wells, many references are made in these standardsto the Water Well Standards. Standards that apply only to cathodic protection wells or that require emphasisfor cathodic protection wells, are discussed in detail in these standards.-63-
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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
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E~B. Sealing Conditions. 421. Tempo
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~CATHODIC PROTECTION WELL STANDARDS
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5.~Introduction:Figure 1.Years DWR
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GENERAL INTRODUCTIONImproperly cons
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Figure 1. YEARS DWR WELL STANDARDSB
Page 24 and 25: .9-REVISIONS TO WATER WELL STANDARD
Page 26 and 27: ~STANDARDSPart I. GeneralSection 1.
Page 28: ~B. c.-13-Many variables are involv
Page 32 and 33: "8. 2.casing and the borehole wall
Page 34 and 35: d. ~c.water shall be used if less s
Page 36 and 37: 3. Foundation and Transition Seals.
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
Page 60 and 61: ~ 1.Section 12. Casing.The term "ca
Page 62 and 63: B. c. E.Over~um~ing and Pum~ Surgin
Page 64 and 65: 2. b.Section 19. Requirements for D
Page 66 and 67: 3. 5. E.freefall only where the int
Page 69 and 70: INTRODUCTIONMost wells in Californi
Page 72: Many cathodic protection wells have
Page 77 and 78: (Division 3, Chapter 9, California
Page 79 and 80: 3. B.E. c.consolidation after place
Page 81 and 82: for surface construction features a
Page 83 and 84: ~Part III.Destruction of Cathodic P
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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