COMPLIANCE INFO 1987-2003 - Laserfiche WebLink

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( i ) Ground water monitoring wells snail be sealed from the (1) Well heads shall be enclosed in a surface security -structure ground surface to the top of the filter pack. that protects the well from the entry of surface -water, accidental damage, unauthorized access, and vandalism. This (j) Borings shall be described in accordance with the provisions may be accomplished by providing a locked well- cap or by Of Sections 2648(t) and (u) of this article, securing the facility within which a well is located. Authority: NSC 25299.3 (k) Pertinent well information including well identificatio-n, Reference: H&SC 25292 well type , well depth, well easing diameters if more than one size 13 used, and perforated intervals shall be, Adopt new Section to read: permanently &fixed to the interior of the surface, security structure and the well identification number and gall type shall be affixed on the exterior of the surface security 2648. General Construction and Sampling Methods structure. Soil and water sampling equipment and materials used to (1) Surface seals for vapor wells that are completed no more construct a well shall be compatible with the stored than 5 feet below the bottom of the underground storage- tank hazardous substance and shall not donate , capture, mask, nor and which are above any free water zones shall be required alter the constituents for which analyses will be made. at the discretion of the local agency on a site-specific (b) Representative samples of all imported materials used for basis. filter packs and to construct seals shall be evaluated to (m) if surface seals for vapor wells that are completed in or determine their acceptability with regard to Subsection (a) below a free water zone are required, the seal shall not of this section, extend below the top of the underground storage tank. (c) All drilling tools shall be thoroughly cleaned immediately (n) Vapor wells constructed wholly within backfill that before a Goring is started. surrounds the underground storage tank and which extends to the ground surface need not be sealed against - infiltration (d) All well casings, casing fittings, screens, and all other Of surface water. Components that are installed in the well shall be thoroughly cleaned before installation in the boring. (o) The need for surface seals for other types of vadoae zone ( eAll sail and wafer samplers shall be cleaned before each installations shall be determined on a case-by-case basis.) sample is taken. (p) In order to implement monitoring Alternatives 2, 3, #, and the ground water monitoring portion of 6, the highest (f) Drilling fluid additives shall be limited to inorganic, non- anticipated ground water level and existing ground water hazardous materials which conform to the provisions of level shall be determined. Highest anticipated ground water Subsection (s) of this section . All additives used and the levels shall be determined by a review of all available depth in which they were used shall be accurately recorded water level records for wells within 1 mile of the site. in the boring log. Existing site ground water levels shall bs established by either water level measurements taken within the last 2-._ (g) Representative samples of additives, cement, bentonite, and years in' all existing wells, for which records are filter media shall be retained for 90 days for possible available, that are within 500 feet of the facility and analysis for contaminating or interfering constituents, which are perforated in the zone of interest, or by drilling (h) Al] dwater nall at least 1 exploratory boring constructed as follows: developed untilthegee eewatenc�ontainsPlessrthanl10 ( 1} The exploratory boring shall be drilled downgradient if Ppm settleable solids. possible and as near as possible to the underground (i ) well heads shall be storage tank within the boundaries of the property provided with a water-tight cap, encompassing the facility, but no further than 500 feet from the underground storage tank. 4.25 4.26 f a