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s j - �� Working To Restore Nature <br /> MAI <br /> 1710 Main Street <br /> Escalon, CA 953201 �f �ll' i� 1Ttl�11" rt <br /> Phone (209) 838-3507 <br /> FAX (209) 838-3509 May 5, 1993 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> RE Soil Excavation Report, 7 B Terminal/Blincoe Trucking, 6700 Grandine <br /> Road, Tracy, CA <br /> Dear Mr Knoll <br /> This letter describes the methods used and results of soil excavation activities conducted at the <br /> above referenced site (Figure 1) The scope of the work was based upon the findings of <br /> previous investigations <br /> SITE BACKGROUND <br /> The site was the location of two 500 gallon underground storage fuel tanks The tanks and <br /> ancillary buried product lines were removed in September 1987 The tanks had been used to <br /> store leaded and unleaded gasoline fuel Figure 2 depicts the former tank locations relative to <br /> other facility features <br /> During tank removal field evidence and subsequent laboratory analyses indicated the presence <br /> of low concentrations of toluene, xylenes, and total petroleum hydrocarbons as gasoline in the <br /> soils and groundwater within the tank excavation Ethylene dibromide, total lead, and benzene <br /> were not detected above method detection limits in any samples Based upon the constituents <br /> and the levels detected the excavation was backfilled Laboratory results for samples are <br /> summarized in Tables 1 and 2 <br /> Five monitoring wells have been installed on the site (MW1, MW2, MW3, MW4, MW5) since <br /> the site investigation was initiated in March of 1990 During the monitoring and sampling <br /> history petroleum hydrocarbons have consistently been detected in the groundwater collected <br /> from well MW 1 which was located next to the former tank location in the down gradient <br /> direction Historical data for monitoring well MW 1 indicate that petroleum hydrocarbon analyte <br /> concentrations have been gradually decreasing in the groundwater except when irrigation of the <br /> fields surrounding the site in late summer causes an increase in the water levels When the <br /> R-32643 rNL <br /> 1 <br />