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r fr^ --Trt E rim rr RW� &A � Y � .sem 1I`v Working To Restore Nature 1710 Main Street Escalon, CA 95320 Phone (209) 838-3507 FAX (209) 838-3509 December 15, 1993 Mr Harlin Knoll San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, CA 95201 Subject Quarterly Monitoring Report, BJJ Trucking, Heinz Facility, 757 East Eleventh Street, Tracy, California Dear Mr Knoll During the fourth quarter 1993, quarterly monitoring and sampling were performed at the above referenced site (Figure 1) Field activities were conducted on October 1, 1993, and included measuring depth to water, purging the wells, and collecting groundwater samples from wells MW2 and MW3 Groundwater levels were monitored on October 1, 1993 Water levels have dropped approximately 0.31 feet since the previous quarterly monitoring event in July 27, 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 sites 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 October 1993 monitoring data from 6700 Grandine 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 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 4QR 1993 FNL