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12 August 1991 <br /> GeoAudit CV 30-34E2-1.6 <br /> Page 2 of 5 <br /> Classification System (see Boring Logs) . <br /> On 4 dune 1891, the top of each well casing was surveyed relative to a <br /> temporary benchmark and }he depth to ground water was measured.ineMY7u2, <br /> in 2-inch <br /> wfrea ater psamples were not roduct was eco recovered <br /> for analysis.pvc bailers an MW - <br /> rxianxNa9 <br /> penetrated an upward-fining arkosic sand body from <br /> Both MW-2 and MW-3 g which was saturated <br /> total depth to approximately 40 feet. This sand, <br /> below 45 feet, <br /> Is moderately weathered and oxidized but contains little <br /> clay. strong }�.ydrocarbon. odors were detected in samples <br /> t 40 and 45 <br /> 1100 ppm in <br /> feet in both wells, and T ranged levels ranged from 20 pm. The laboratory <br /> those samples No.e zone 24 May from <br /> a91) .and 43 tchain of custody form are <br /> report <br /> attached. <br /> Above 40 feet, the two wells penetrated slightly different material. MW- <br /> pth of <br /> 2 encountered mostly sanwhereas MW-3 <br /> dy silt to a desa d to a6depth sof 20 feet. No <br /> penetrated clay, clayey silt, and clayey _ <br /> hydrocarbon odor was detected <br /> d leveis interval in ls low to moderate, ranging up to <br /> odor was present in MW-3 m or less. In general, <br /> Gly 280 ppm at 35 feet in MW-2. Benzene was with ppm <br /> concentrations. <br /> ATE&X concentra16 <br /> tions correlate positiv <br /> Moderately well-gra0ad sand is present in mandfrom <br /> 103to 1 feet.arThis <br /> interval consists of sitly clay and clayey <br /> odor was detected. <br /> A 1�3�er.:of free product (gasol.ino) measuring .6.125 inches thick in MW i" <br /> and Yak2: incz�eR thick in MW-2 was present when the wells were monitored <br /> present i <br /> on 4 dune 1991. No free product was n MW--3. <br /> -2 and <br /> M The adjusted depth to ground waterdatages between 46.42 feet in(Table I) indicate that the local <br /> 46.52 feet in MW-3. The surveying draulic gradient of no <br /> J water table is essentially flat, <br /> slight <br /> gore au <br /> more than 0.002 (o.1 degree) to the south <br /> CONCLUSIONS <br /> 1. The results of this investigation e_migr_at n cannot obe ruled out <br /> ground-water are-impacted.-0th soil and <br /> at this time. <br />