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

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2. b.Section 19. Requirements for Destroying Monitoring Wells and Exploration Holes.General requirements for destroying monitoring wells and exploration holes are contained in Section 23 ofthe Water Well Standards. Special considerations for monitoring wells and exploration holes are as follows.AMonitorinl! Wells. Monitoring wells shall be destroyed in accordance with the followingrequirements and Section 23 of the Water Well Standards, irrespective of their original dateof construction.1. Preliminarv Work. A monitoring well shall be investigated before it is destroyed todetermine its condition and details of its construction. The well shall be soundedimmediately before it is destroyed to make sure no obstructions exist that will interferewith filling and sealing.The well shall be cleaned before destruction as needed so that all undesirablematerials, including obstructions to filling and sealing, debris, oil from oil-lubricatedpumps, or pollutants and contaminants that could interfere with well destruction, areremoved for disposal.The enforcing agency shall be notified as soon as possible if pollutants or contaminantsare known or suspected to be present in a well to be destroyed. Well destructionoperations may then proceed only at the approval of the enforcing agency. Theenforcing agency should be contacted to determine requirements for proper disposalof all materials removed from a well to be destroyed.Sealinl! Conditions. The following minimum requirements shall be followed whenvarious conditions are encountered.a. The monitoring well casing, and any other significant voids within the well,shall, at a minimum, be completely filled with sealing material, if the followingconditions exist:.The monitoring well is located in an area of known or potential pollutionor contamination, and,.The well was constructed and maintained in accordance with thesestandards.Sealing material may have to be placed under pressure to ensure that themonitoring well is properly filled and sealed.A monitoring well shall be destroyed by removing all material within theoriginal borehole, including the well casing, filter pack, and annular seal; andthe created hole completely filled with appropriate sealing material, if thefollowing conditions exist:.The well is located in an area of known or potential pollution or contamination,and,.The well's annular seal, casing, screen, filter pack, or other componentswere not constructed or maintained according to these standards so thatwell destruction by merely filling the well casing with sealing material, asin "a" above, would not prevent potential water-quality degradation from-51-
the movement of poor-quality water, pollutants, or contaminants throughthe destroyed well structure.Material to be extracted from the original borehole shall be removed bymeans of drilling, including overdrilling, if necessary. The enforcing agencyshould be contacted to determine requirements for proper disposal ofremoved materials.Casing, filter pack, and annular seal materials may be left in place duringsealing operations, if the enforcing agency agrees they cannot or should notbe removed. In such a case, appropriate sealing material shall be placed inthe well casing, filter pack, and all other significant voids within the entirewell boring. Casing left in place may require perforation or puncturing toallow proper placement of sealing materials. Sealing material may have to beapplied under pressure to ensure its proper distribution.c. Monitoring wells shall, at a minimum, be destroyed in accordance with therequirements of Section 23 of the Water Well Standards if located in an areafree of any known or potential contamination or pollution.Exploratory Borings. Exploratory borings shall be completely filled with appropriate sealingmaterial from bottom to top, if located in areas of known or suspected contamination orpollution. Borings located outside such areas shall, at a minimum, be filled with sealingmaterial from ground surface to the minimum depths specified in Section 23 of the Water WellStandards. Additional sealing material shall be placed below the minimum surface seal whereneeded to prevent the interchange of poor-quality water, pollutants, or contaminants betweenstrata penetrated by the boring.Appropriate fill or sealing material shall be placed below and between intervals containingsealing material. Sealing material is often economical to use as fill material.The boring shall be inspected immediately prior to filling and sealing operations. Allobstructions and pollutants and contaminants that could interfere with filling and sealingoperations shall be removed prior to filling and sealing. The enforcing agency shall be notifiedas soon as possible if pollutants or contaminants are known or suspected to be in a boring tobe destroyed. Well destruction operations may then proceed only at the approval of theenforcing agency. The enforcing agency should be contacted to determine requirements forproper disposal of removed materials.c. Placement of Material. The placement of sealing material for monitoring wells and exploratoryborings is generally described in Section 23 and Appendix B of the Water Well Standards. Thefollowing additional requirements shall be observed when placing sealing material formonitoring well or exploratory boring destruction.1. Placement Method. The well or exploratory boring shall be filled with appropriatesealing, and fill material where allowed, using a tremie pipe or equivalent, proceedingupward from the bottom of the well or boring.Sealing material shall be placed by methods (such as the use of a tremie pipe orequivalent) that prevent freefall, bridging, and dilution of sealing materials, and/orprevent separation of aggregate from sealants. Sealing material may be placed by. B.-52-
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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
Page 8 and 9:
~ viiForewordOrganization.TABLE OF
Page 10 and 11:
~ ix(4) Glass Fiber Reinforced Resi
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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
Page 21 and 22: 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
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 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 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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