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'00AMMl- <br /> MROr <br /> N <br /> 'M <br /> Aff M MM <br /> T 7Z f k i "MOMM MawFdh. M <br /> PROPOSED PROTOCOL FOP INSTALLATION OF MONITORING WELLS AT <br /> . CHEVRON SERVICE STATION 9-19113, <br /> 5 EAST HARDING WAY, STOCKTON, CALIFORNIA <br /> CA Engineering, Scienco, and Tochnologyo Inc. (CA) has been <br /> retained by Chevron U.S.A. Inc. to monitor potential ground-water <br /> contamination near 4n excavation of the underground tank field at <br /> former Chevron Service Station 9-1918, located at 45 Eact Harding <br /> Way, Stockton, California. To datorminQ the extent and level of <br /> potential ground-water contamination, C1,evron proposersto drill <br /> 'N three soil borInga and install monitoring well$ In those borings. <br /> The proponed well locations are shown In Figure 1 . <br /> :" ,-i SOila honeath and around the tank field are to be excavated, and <br /> Z�t '3_ v the excavated soils are to be aerated on site. The proposed <br /> locations Indicated on Figur,? 2 will be adjusted an necessary to <br /> allow for the construction of the GPOIIG piles. The locations <br /> are specific enough such that two wells will be drilled <br /> downgradient of the tank excavation and one will be placed <br /> upgradlunt ae- generally Indicated on Figure 2. All wells will be <br /> placed 50 that potential damage, and compromise and interference <br /> with rther activities are minimized. <br /> Soil monitoring wells will be drilled and Installed according to <br /> the general guidelines of the California State Water Resources <br /> Control Board In "California Undergroupd, Storage Tank Regula- <br /> tions" and more specific guidelines of San Joaquin County. <br /> Unless otherwise specified by City and County guidelines, the <br /> Boll borings. shall be drilled with a hollow-stem auger to <br /> perennial ground water or to a minimum depth of i0o feet 11 <br /> ground water is not encountered. If ground water is encountered <br /> at a depth of less than too feet, the soil borings will be <br /> drl 1 led-tO-20-f Get--below-the—lovest--Anticipated ground-vater <br /> level, which appears to be 41 feet as observed In a water well <br /> less than a half mile from the site, However, wells will not <br /> extend through laterally extensive clay layers that lie below the <br /> A <br /> water table: if there In at least 5 feet of competent clay below <br />