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i«w1 (NC <br /> _ distance of five feet from the sidewalls and bottom of the concrete tank c Maximum <br /> concentrations of hydrocarbons In the sod Include benzene {non-detection levels); <br /> r\ _ <br /> toluene ( 029 ppm), ethylbenzene (0 13 ppm), xylene (non-detection), total petroleum ' <br /> hydrocarbon as gasoline (220 ppm), total petroleum hydrocarbon as diesel (17,000 ppm), <br /> ,,and total-petroleum hydrocarbon (41,000 ppm} Analytical results from soil-samples <br /> ,-indicate non-detection levels for all hydrocarbons at a maximum vertical extent of 10 feet ' <br /> below the concrete tank bottom ,A volume of 450 cubic yards of soil impacted by <br /> hydrocar6on_compounds is estimated to_be present in- the subsurface-immediately <br /> surrounding the concrete tank <br /> Chlorinated hydrocarbons are present in concentrations varying from trace detection <br /> levels to levels that exceed the California Regional Water Quality Control Board <br /> (CRWQCB) Primary Maximum Contamination Levels (MCL) for water by factors of 2 to <br /> 10 times z Soil-that--has been identified as having-been impacted _by chlorinated <br /> hydrocarbon-compounds extends from as shallow as-10 feet to at-least 42 feet below =' <br /> -� ground surface This soil appears to be located immediately north of the concrete tank <br /> However, no chlorinated hydrocarbon compounds are found in soil located beneath the <br /> concrete tank Lateral extent of chlorinated hydrocarbon impacted soil-is nar delineated <br /> ,-but based on known and projected chlorinated hydrocarbon sod concentration patterns ` <br /> is estimated to be approximately 1750 cubic yards Vertical extent of the chlorinated <br /> hydrocarbon impacted soil is not identified, i <br /> c-Ground water beneath the Lustre-Cal site is estimated to be approximately 55 feet,belvw <br /> ground surface <br /> WZI Inc concludes the following <br /> 1) Areas A and D do not warrant further site assessment for hydrocarbon or <br /> chlorinated hydrocarbon compounds in the soil No ground water or public <br /> health threat is present at either of these two areas <br /> 12-270010 013 Page 3 <br />