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

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2 feet laterally in all directions from the outside of the well boring, unless otherwise approvedby the enforcing agency.The base shall be free of cracks, voids, and other significant defects likely to prevent watertightness. Contacts between the base and the annular seal, and the base and the well casingmust be water tight and must not cause the failure of the well casing or annular seal.Where cement-based annular sealing material is used, the concrete base shall be poured beforethe annular seal has set, unless otherWise approved by the enforcing agency.E. Vaults. At the approval of the enforcing agency, the top of a cathodic protection well may bebelow ground surface because of traffic or other critical considerations. A watertight,structurally-sound vault, or equivalent feature, shall be installed to house the top of the wellcasing if it terminates below ground surface.The vault shall extend from the top of the annular seal to at least ground surface. In no caseshall the top of the annular seal be more than 4 feet below ground surface.The vault shall contact the annular seal in a manner to form a watertight and structurallysoundconnection. Contacts between the vault and the annular seal, and the vault and the wellcasing (if any), shall not fail, or cause the failure of the well casing or annular seal.Where cement-based annular seal.ng materials are used, the vault shall be set into or contactthe annular sealing material before it sets, unless otherwise approved by the enforcing agency.If bentonite-based sealing material is used for the annular seal, the vault shall be set into thebentonite before it is fully hydrated.Cement-based sealing material shall be placed between the outer walls of the vault and theexcavation into which it is placed to form a proper, structurally sound foundation for the vault,and to seal the space between the vault and excavation.8). F.Sealing material surrounding the vault shall extend from the top of the annular seal to groundsurface, unless precluded in areas of freezing. If cement-based sealing material is used for boththe annular seal and the space between the excavation and vault, the sealing material shall beemplaced in a "continuous pour." In other words, cement-based sealing material shall be placedbetween the vault and excavation and contact a cement-based annular seal before the annularseal has set.The vault cover or lid shall be watertight but shall allow the venting of gases. The lid shall befitted with a security device to prevent unauthorized access and shall be clearly andpermanently labeled "CATHODIC PROTECTION WELL." The vault and its lid shall bestrong enough to support vehicular traffic where such traffic might occur.The top of the vault shall be set at grade, or above, so that drainage is away from the vault.The top of the casing contained within the vault shall be capped in accordance withrequirements of Subsection B, above so that water, contaminants, and pollutants that may enterthe vault will not enter the well casing.. -68-Protection From Vehicles. Protective steel posts, or the equivalent, shall be installed arounda cathodic protection well casing where it is terminated above ground surface in areas ofvehicular traffic. The posts shall be easily seen and shall protect the well from vehicularimpact.
for surface construction features are contained in Section 10 of the Water WellMaterials used for cathodic protection wellthe requirements for casing materials and their installation in Section 12 of theVariance from the standard shall be at the approval of the enforcing agency. It is.-0 -,C .installation of gas vents and electrical conduit.protection well casing should be at least 2 inches in internal diameter to facilitate eventual wellSection 10. Sealing-Off Strata.If a cathodic protection well penetrates a stratum or strata below the minimum required annular surface sealdepth specified in Section 7, above and that stratum contains poor-quality water, pollutants, or contaminantsthat could mix with and degrade water contained in other strata penetrated by the well, additional annularsealing material shall be placed below the minimum required annular surface seal to prevent mixing and waterqualitydegradation.The following minimum requirements shall be observed for isolating zones containing poor-quality water,pollutants, or contaminants for various cases:Case 1. UDDer Stratum. If a stratum containing poor-quality water, pollutants, or contaminants lies abovea stratum to be protected, annular seal material shall extend from the top of the stratum containing the poorqualitywater, pollutants, or contaminants down to at least 10 feet into the confining layer separating the twostrata, or through the entire thickness of the confining layer, whichever is least.Case 2. Lower Stratum. If a stratum containing poor-quality water, pollutants, or contaminants lies belowa stratum to be protected, the annular space opposite the stratum to be protected shall be sealed along its fulllength. The seal shall extend at least 10 feet into the confining layer separating the two strata, or through theentire thickness of the confining layer, whichever is least.Case 3. Multiole Strata.a. Where two or more strata containing poor-quality water, pollutants, or contaminants are adjacent toone another and overlie a stratum to be protected, the annular space opposite the strata containingpoor-quality water, pollutants, or contaminants and opposite all interbedded confining layers shall besealed. The annular seal shall extend at least 10 feet down into, or completely through, whichever isleast, the confining layer separating the strata containing poor-quality water, pollutants, or contaminantsand the underlying stratum to be protected.b. Where two or more strata containing poor-quality water, pollutants, or contaminants underlie astratum to be protected, the annular space opposite the stratum to be protected shall be sealed. Theseal shall continue down at least 10 feet into, or completely through, whichever is least, the confininglayer separating the stratum to be protected and the underlying strata containing poor-quality water,pollutants or contaminants.-69-
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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
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.9-REVISIONS TO WATER WELL STANDARD
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~STANDARDSPart I. GeneralSection 1.
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~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
Page 44: ~-29-
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 75 and 76: Need for Cathodic Protection Well S
Page 77 and 78: (Division 3, Chapter 9, California
Page 79: 3. B.E. c.consolidation after place
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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