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Vi j Working To Restore Nature C+ IN 1710 Main Street Escalon, CA 95320 Phone (209) 838-3507 May 25, 1993 FAX (209) 838-3509 Mr Harlin Knoll San Joaquin County Public Health Services Environmental Health Division P Q Box 2009 Stockton, CA 95201 RE Quarterly Monitoring Report BJJ Trucking, Heinz Facility, 757 East Eleventh Street, Tracy, CA Dear Mr Knoll 40} During the second quarter 1993, quarterly monitoring and sampling were performed at the above referenced site (Figure 1) Activities were conducted on April 27, 1993, and included measuring depth to water, purging the wells, and collecting groundwater samples from wells MW2 and MW3 Groundwater levels were monitored on April 27, 1993 Water levels have dropped approximately 0 09 feet since the previous quarterly monitoring event in January 1993 (Table 1) The gradient cannot be calLulated specifically for this site because only two well-, are accessible Monitoring well MW 1 was previously inadvertently destroyed during paving activities However, RESNA fnduso les has current monitoring data from the uppermost saturated zone at two Tracy sites within a one-mile radius of the subject site The local groundwater gradient can be established using April 1993 monitoring data from 8181 Eleventh Street (Genstar Western Stone) and 6700 Grantline Road (J B Terminal) The site locations and gradient directions relative to the subject site are shown on Figure 3 The most recent groundwater gradient snap and monitoring data for each site are included in Attachment 1 Groundwater flow is essentially in a northerly direction There are no known Surface or subsurface Occurrences at the BJ I Trucking facility which would exert a significant influence on the direction of groundwater glow Therttoie, even though the direction of flaw cannot be 2QR1993]Ni 4•