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revealed in the collected samples of soil or groundwater Analytical results of soil samples <br /> collected from ASB-1 were wholly nondetectable Based on these results, Water Works <br /> concluded that waste-oil contamination did not appear to spread laterally beneath the on--site <br /> building <br /> On December 15, 1989, soil was overexcavated from the western wall near the former diesel <br /> UST area Laboratory analytical results revealed a TPH-d concentration of 30 6 ppm at 6 feet, <br /> TPH-d was not detected in samples collected at depths of 2 feet or 16 feet <br /> Ground-water <br /> samples collected from MW-1 in February of 1990 indicated a TPH-d <br /> concentration of 350 ppm A TPH-d concentration of 59 ppm was detected in a sample collected <br /> two months later in April of 1990 <br /> On September 27, 1993, Roger Foote Associates (RFA) of West Sacramento drilled three soil <br /> borings, two of which were converted to ground-water monitoring wells, MW-2 and MW-3 <br /> Soil boring ASB-2 was drilled at an angle of about 30° to vertical and was extended to an <br />' equivalent vertical depth of 33 5 feet Both monitoring wells were completed to a total depth <br /> of 50 feet <br />' Selected soil samples were analyzed for TPH-d, TPH-g, and BTEX constituents by California <br /> Laboratory Services of Rancho Cordova, a State-certified analytical laboratory Soil samples <br /> collected from ASB-2 Q 6 & 19 feet, MW-2 @ 15, 35 & 40 feet, and MW-3 @ 35 & 40 feet <br /> below surface grade (bsg) were found nondetectable for all constituents Ground water was <br /> encountered at an average depth of 45 feet bsg <br />' W W Irvin, Inc of Merced was awarded the contract to perform ground-water monitoring by <br /> Ms Carmen Punla in January of 1995 Monitoring wells MW-1 through MW-3 were sounded <br /> on February 6, 1995 Mr Harlin Knoll of the San Joaquin County Division of Environmental <br /> Health attended the monitoring activities No detectable petroleum hydrocarbons were revealed <br /> in samples collected from the three wells <br />' GROUND-WATER MONITORING <br />' Ground-water monitoring for the second quarter was performed on May 9, 1995 Utilizing a <br /> Keck0 interface probe, the W W Irwin, Inc staff geologist determined that the average, <br />' piezometric depth-to-water underlying the site was 32 25 feet bsg <br /> WW In"n Inc <br /> Project No 33236 00 <br /> May 1993 <br /> 3 <br />