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lel v)1 1 PF 1-6 t!j Working To Restore Nature 93 AUG 23 Q4i 2� t 7 1710 Main Street Escafon, CA 95320 Phone (209) 838-3507 August 19, 1993 FAX (209) 838-3509 g 1 Mr Harlin Knoll San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, CA 95201 RE Quarterly Monitoring Report, BJJ Trucking, Heinz Facility, 757 East Eleventh Street, Tracy, CA Dear Mr Knoll During the third quarter 1993, quarterly monitoring and sampling were performed at the above referenced site (Figure 1) Activities were conducted on July 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 July 27, 1993 Water levels have dropped approximately 0 095 feet since the previous quarterly monitoring event in April 1993 (Table 1) The gradient cannot be calculated specifically for this site because only two wells are accessible Monitoring well MW 1 was previously inadvertently destroyed during paving activities However, RESNA Industries has current monitoring data from the uppermost saturated zone at two Tracy saes within a one-mile radius of the subject site The local groundwater gradient can be established using July 1993 monitoring data from 8181 Eleventh Street (Genstar Western Stone) and 6700 Grantline Road Q B Terminal) The site locations and gradient directions relative to the subject site are shown on Figure 3 The most recent groundwater gradient map 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 BJJ Trucking facility which would exert a significant influence on the direction of groundwater flow Therefore, even though the direction of flow cannot be 3QR-1993 FNL