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Add.itionW rcyuirernents for surface conscructibo feature,; are contained in Section 10 Of the Water Well Standards, Section 9. casj lg. Vent pipe,anode access tubing, and any other tubular irlateri3ls that pas, through the interval to be fillcct and scaled are all colaside red casing for the purpc c of Ihese standards. Materials used for ct'cthadic protection well cxiing generally shall meet the requirements for using materials aad their installation in Section 12 of the Water Well Standards. Variance from the standards shill be at the approval of the enforcing agency, It is tceurnmendcd tbaL practices prescribed by ttie Mitional AssociEtfion of Corrosion Enghic42�rs also be followed in 1bcc design and instaf.lation of gas vents and electrical conduit. Cathodic protection well using should be al least 2 inches in internal diameter io facilitate eventual well destruction. Section 10. Scaling-Off Strata. If a cathodic protection well penetrates a stratum or strata below the minimum required annular surface seal depEh specified in Section 7, above and that slrxturn contains poor-quality water, pollutants, or coil t3lilinailis that could rnix vvith and degrade }vales contained in other str a peneErated by the well, additional annular sealing material shall be placed helnw the minimum rc4uired annular surface seal to prevem t mixing and water- quality degradation. The following mirtimum requirements shall he nto-served For isolating Zones containing poor-quality water, pollutants, or contaminaras for various Eases: Case I. Up,per Stratum. If a stratum containing poor-quality water, pollutants, or Mnlaminants lies above a stratimn to he protected,annular seat material shall extend from the top of the stratum conutining the poor- quality water, pollutants, or contaminaRts clown t❑ at least 10 feel into the confining layer separating the: Two strata, ar through the entire thickness of the confining layer, whichever is least. mzc 2. La cr Stratum. If a mraturn containing poor-quality wider, pollutants, or cowarrtinants lies below a stratum to be protected, the annular spat-oppnMte the Stratum to bC protected shall he scaled along its full length. 'Fite sc l shall extend at least 10 iiect into the confining layer separating She two strata,or thri ugh ibe, eralrc thickness or the oonfining kiyer, whichever is beast. C' se_3. NJUItiyle Strata. a. Where two or more strata containing peonquality water, pollutants, or eontarninants am adjacent to Me anOther And overlie a siralurn to he proteetW, the annular space opposite the strata Containing poor-quality water, pollutants, or contarnin:inis and uppasilc ull interbedded cbnfi:ning layers shall he # sralcul, The annular seat shall exiend at least 10 feet down into, or completely through, whichever is least, theconfiningIaycrseparatingthcs[rat a con tainingpoor-quaIityw•atcr,poll utants,orconzarninants ` and the underlying stratum to be protected, ■ b. Where two or more. strata containing poor-Pretty waxer, pollutants, or contaminants underlie a stratums to be pratectect, the annular spuEe opposite the stratum to be protected shall be sealed. The seal shall continue Mourn at least 10 rect info.. or completely through, whichever is least, The confining layer wparating the stratum to be protected stud the underlying strata containing poor-quality water, pollutarn-9 or contamirtarits. -6 - 'I