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August 6, 1991 <br /> ARCO Station No. 548 <br /> ranges from 45 to 50 feet below surface grade. The groundwater basin has been developed <br /> for intensive irrigation, domestic, industrial, municipal, and stock use. <br /> n <br /> PROPOSED WORK <br /> arbons in soil and <br /> a#ion is designed to assess the extent of hydrochydrocarbons. The specific whether <br /> This investigation <br /> ground water underlying the site has been affected by Y <br /> tion. Applied <br /> summarized below and are discussed in the following Field Procedures sec <br /> GeoSystems will perform the following tasks: <br /> o Acquire a drilling permit from San Joaquin Public Health Services. <br /> o Contact Underground Service h se <br /> Alert least 48 hours before drilling to <br /> delineate public utility lines at t <br /> rill <br /> 10 <br /> o Observe a licensed well driller da elr 58feetbelowe boringster soil o <br /> grade) or5 feet into <br /> feet below ground water (approxlm Y <br /> the first aquitard, whichever is encountered fust. The borings will be <br /> converted to groundwater monitoring wells. <br /> �V y approximately 10 feet <br /> o Observe drilling of two 10-inch-diameter soil <br /> dete for to <br /> readings of rn <br /> abil <br /> ove ground water. p per million by volume (pp <br /> Samples from the borings are above 50 parts p <br /> the borings will be converted to vadose wells, otherwise the borings will be <br /> grouted to surface. <br /> 0 <br /> Observe drilling of three, 8-inch-diameter soil borings. The borings will be <br /> terminated at 5 fesoil samples <br /> et above ground water when below 30cfeetutivewhichever is <br /> with PID readings below 50 ppmv are collected <br /> encountered first. <br /> disturbed soil samples at 5-foot intervals from the ground <br /> o Collect relatively un <br /> surface to the total depth of each boring. <br /> 5 <br /> AGS:0004.4 <br /> E:: <br />