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November 8, 1995 • <br /> t� Page 2 <br /> Available information indicates that the original product facilities included two steel <br /> 10,000-gallon gasoline underground storage tanks (USTs), one steel 5,000 gallon <br /> gasoline UST, one steel 1,000 gallon used oil UST, two product islands, and one floor <br /> sump associated with the lube bay The gasoline UST's contained supreme, middle- <br /> grade, regular These product facilities were removed in September 1995 <br /> The product facilities being installed at the site include three double-walled fiberglass <br /> 12,000-gallon gasoline USTs, one 250 gallon above ground waste oil tank, and two <br /> product islands (Figure 2) <br /> Hydrogeologic data were evaluated from regional data and site topography and the <br /> proxinuty of the site to the Stamslaus River This evaluation suggests that the site is <br /> underlain by fine- and coarse-grained alluvial deposits Groundwater is anticipated to <br /> occur at a depth of approximately 20 feet below ground surface Further, regional <br /> groundwater flow direction in the site viciruty is interpreted to be to the east or southeast <br /> in the general flow direction of the Staruslaus River <br /> PROPOSED SCOPE OF WORK <br /> The scope of work for this investigation has been proposed primarily to evaluate the soil <br /> and groundwater conditions beneath the site The specific scope of work is discussed <br /> below <br /> • Permits. PACIFIC will obtain the appropriate soil boring and <br /> groundwater monitoring well permits from San Joaquin County prior <br /> to uutiating field work <br /> • Soil Boring and Well Installation, Four soil borings (B-1 through <br /> B-4) and fou;groundwater monitormg wells (MW-I through MW-4) <br /> are proposed to investigate soil and groundwater conditions in the <br /> vicinity of the former USTs, product piping, and product islands <br /> (Figure 2) <br /> • Well Elevation Survey,Well Development, avid Well Sampling. <br /> The new wells will be surveyed to MSL by a state-certified surveyor <br /> The wells will then be developed and sampled in accordance with <br /> procedures outlined in Attachment A <br /> • Soil and Groundwater Analysis. Selected soil samples and <br /> groundwater samples will be submitted to a California State-certified <br /> laboratory and analyzed for the presence of total purgeable petroleum <br /> hydrocarbons as gasoline (TPPH-g), benzene, toluene, ethylbenzene, <br /> xylenes, total extractable petroleum hydrocarbons calculated as diesel <br /> (TEPH-d), and MTBE <br /> 3201591 A/WKPLAN <br />