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NEW <br /> R}51pEG� S CM, p� <br /> 2.4 IoN&r, AMD LOGtOM WATKR FW.0 <br /> Ground wafter flow direction in this region is to the west and <br /> towards south Stockton from the foothills of the Sierra Nevada <br /> Mountain Ranges, and towards the east from the Sacramento-San <br /> Joaquin Delta. At present, encroachment of saline waters from the <br /> arena are imparzng the quality of the ground water in, the Stockton <br /> WEGE surveyed each well (top of casing) with a transit using the <br /> southwest corner of the current tank pad <br /> datum. Survey readings were recalculated to correct eRE levaas tionstto <br /> the USGS topographic map (USGS East Stockton Quad. , FIGURE 2). <br /> Based upon ground water elevation measurements the overall local <br /> flow direction is to the east-northeast at a relatively flat slope <br /> Of 0.4% (0.731/182.51), However, a trough is <br /> site with a flow direction from MW MW-6 to g Present across the <br /> direction from MW-1 oseeo 8/24/89 d a flowW-3 on /directia flow <br /> on from <br /> 14W-1 to MW-5 on 11/28/89 <br /> ' FIGURES 4A, 4B, and 4C). <br /> . 2.5 GROUND RATIM QUARTZRLY SAMPLING AND PROCKDURES <br /> Quarterly ground water samples haus been callecte on 4/12j89, and <br /> i „/ 4/89. These samples were collected by a WEGE geologist and <br /> Chain Of Custody's hand delivered an ice to a state certifi <br /> testing laboratory {McLaren Analytical Laboratos ed <br /> analyses. These samples were analyzed for TRH, BTEX,fand Ethylene <br /> Dibromide (EDB) concentrations using EPA <br /> modified W Method <br /> 60 ds <br /> 1 80 <br /> 4 re 15 <br /> respectively 60 <br /> represented in Table 1 nfethia repoxe�ete chemical and <br /> are <br /> Before water "purging" or sampling commenced <br /> interface probe (resistivity meter) was ,:owe , a ground water <br /> Towered in <br /> depth to water measurements were recorded to each well and <br /> designed bailer was lowered into the waterNext, a specially <br /> gasoline product was Floating on the water. determine if <br /> observed, product thickness was measured and ground <br /> was <br /> elevations were recalculated to compensatea and water <br /> gasoline, samptar wells that contained product of <br /> not <br /> "purged" or sampled. f <br /> In order to <br /> submersible "purger each well, an electrical 4" diameter <br /> Water was pip was lowered down the well and into the nd <br /> water. <br /> temperaturer was pumped from each well until PE, conductivity, <br /> parameters stabilized (approximately 15 a20 <br /> drums • The "Purged" water was contained in labeled 55 g <br /> allon <br /> disposition. e sec <br /> and stored within taured compounds for later <br /> U <br /> Hr <br /> 9 _ <br />