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4i <br /> i§ <br /> M <br /> WO Z 6 <br /> Eli <br /> the water tablo, the walln will bo tortmin4tod I to 2 foot into <br /> this clay. <br /> The boring will be completed an a monitoring well according to <br /> Section 2647 of "California Underground Storage Tank Regulations" <br /> (Figure 2). Factory-perforated PVC acroon (typically 4-inch <br /> diameter, 0.020-Inch clot, Schedule 40) w-11 be ',$stalled from <br /> the bottom to 10 feet above the highest anticipated ground-water <br /> level; blank PVC casing will be installed from the top of the <br /> screen to ground surface. The bottom and of the casing In each <br /> wall will be fitted with either a threaded and plug or slip cap. <br /> The annular space (greater than 2 Inches) between the borehole <br /> and tho casing will be filled with a filter pack of clean, sand <br /> of an appropriate size. The filter pack will extend from a depth <br /> 2 feet above the- top of the scroon to i foot below the bottom of <br /> the casing, except where depths to water are logo than 10 feet. <br /> 11 "'be filter pack will be sealed with a minimum of 3 fact of bento- <br /> I nate pellets and a nea_t, rout to the ewurface3. <br /> The top of <br /> each well will bo Corpleted and secured with a vater-t1ght <br /> traffic box that can be opened only with a special wrench and a <br /> locked well cap will be Installed to further discourage unauthor- <br /> ized access and vandalism. A tag with the well number, well <br /> type, depth of well, perforated intervals, and well diameters <br /> will be attached to the interior of the well cover. <br /> If no ground water is encountered or if ground-Yater monitoring <br /> is not desired, each soil boring will be completely sealed. Neat <br /> cement will be used tog the boring from round surface to <br /> the bottom of the boring. 'r <br /> T, During drilling, undisturbed sail samples will be acquired at <br /> -----5-.Fect--intervale-from-the-liurfacc--down-to--the--total depth of the <br /> bore hole, using a California modified split-spoon sampler with <br /> brass liner. Sampling below the water table is not required, but <br /> It a6viists In the characterization of the soil profile. A sample <br /> just above the water table or at the termination of a dry boring, <br />