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Casing spacers shall be designed to allow the proper passage and distribution of sealing material around casing(3) within the interwil(s) to be sealed. Additional discussion and standards for placement of the annular seal are contained in Section 9, Seaton 13, and Appendix 13 of the Water Well Standards, I Section 10, Surface Construction Features. Surface ccnstructiop features of a rrionitoring well sliall serve to prevent physical damage to the well, prevent entrancc of surface water, pollutants, and contaminanis; and prevent unauthorized access. A. Lacking Cover. The Lop of a monitoring well shall be protected by a locking cover or equivalent level of protection [o prevent unau[hori�ed access. B_ Casing. The top of a monitoring well using shall be f tIed with a cap or "sanitary seal" to prevent surface water, pollutants, or contaminants from entering the well bore. Openings or passages for water Ic%rcl measurement, venting, pump power cables, discharge wbing, and other access shall be protected ag:Iinst entry of surface w;L[c:r, pollutants. and contaminants, C. Floodin - "fire top of the well �_, iOg shall terminate above ground surface and known lcveis of Ilooding, except where site conditions, such ac vehicular Iraffac, will not ullow- D, Bases- Unless otherwise, approved by the enforcing agency, a conercte base air pad shall be constructed around the top t)f a monitoring well casing at ground surface and contact the: annular srzi1, unless the top of the mirlg is below ground surface as provided by Subsection E, below. "Die base shall he at least 4 inches thick and shall slope to drain away from The well casing, The base shall c:x[cnd at least two reel litierally in ail directions from the outside,of the MP well boring, unless o[herwise approval by [hc enforcing agency. The base shall be free of cracks, voids, and other significant defec[s likely to prevent water tightness. Contacts between the base yLna the annular seal, and the base and The,well Lasing must be water tight and must not cause the failure of Ihc:well casing or annular seal. I Where cernerlt-based annular sealing material is used, the concrete base shall he poured before The annular seal has set, unless otherwise approved by 4hc enforcing agency, E, Vaults. At the approval of the enforcing agency, the top of the well casing may be below ground surface because of Irxffic or other critical c_crnsidcralion& A structurally-sound waicrtight vault, or equivalent fe aturc, shall be installcd to horse the top of a monitoring well that is below ground stirf rcc_ Tkie vault shall extend from the tog of the annular siIal to at least ground surface. In 110 case Shall the top of [hc annular seal be more than 4 feet below ground surface. The vault shall cunwct tbe ;nnuiar seal in a manriex to form a water[ight and slrncturally sound connection. Contacts between the vault and the annular seal,and the vault and the well rasing, if anv, shall not fail or cause the failure of the well casing or annular seal. Where ccemeni-based annular seal materials are used. the vault shall be sex into or MT10ct the annular seal material before it sets, unless oiherwise approved by the enforcing agency, If bi rnumite-based scaling material is wgc4 for the annular seal, the vault should be set into the bentonite before it is fully hydrated. -45-