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K <br /> Mr. Kenneth R Earnest <br /> June 4, 1992 <br /> Page 3 <br /> Fecal coliform was not detected in the ground water sample collected from monitoring well MW-1 in <br /> concentrations greater than 3 8 colony-forming units per 100 milliliters A copy of the laboratory report <br /> is included in Enclosure E. <br /> Discussion <br /> Concentrations of petroleum hydrocarbon constituents greater than 1 part per million (ppm) were not <br /> detected in soil samples collected from soli borings MW-1, MW-2, B-1, and B-2 Soil samples collected <br /> at 35 and 50 feet below grade from the soil boring for MW-3 contained TPHg at concentrations of 910 <br /> and 730 ppm, respectively <br /> The ground water sample collected from monitoring well MW-1 did not contain detectable concentrations <br /> of petroleum hydrocarbon constituents Ground water samples collected from monitoring wells MW-2 <br /> and MW-3 contained concentrations of 16 and 180 parts per billion benzene, respectively <br /> The inferred direction of ground water flow is toward the southeast with a relatively flat gradient of <br /> approximately 0 001 foot per foot <br /> It is recommended that a copy of this report be forwarded to the following agencies <br /> Mr Mike Infurna <br /> Environmental Health Department <br /> County of San Joaquin <br /> 445 North San Joaquin Road <br /> Stockton, California 95201 <br /> Mr Gordon Boggs <br /> California Regional Water Quality Control Board, <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, California 95827 <br /> Sincerely, <br /> ACTON + MICKELSON • van DAM, INC. <br /> &Z 6 <br /> Hal E Hansen Dale A van Dam, R G <br /> Hydrogeologist California Registered Geologist#4632 <br /> HEH DAvD mid <br /> Enclosures <br /> ACTON• MICKELSON • van DAM, INC Consulting Scientists, EaVaees,and Geologists <br />