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Working To Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 <br /> FAX (209) 838-3509 February 22, 1993 <br /> Mr Harlin Knoll R C.E <br /> San Joaquin County Public Health Services F E B 2 3 1893 <br /> Environmental Health Division ENVIRONMENTAL HEALTH <br /> P O Box 2009 PERMIT/SERVICES <br /> Stockton, CA 95201 <br /> RE Quarterly Monitonng Report, BJJ Trucking, Heinz Facility, 757 East Eleventh <br /> Street, Tracy, CA <br /> Dear Mr Knoll <br /> During the first quarter 1993, quarterly monitoring and sampling were performed at the above <br /> referenced site (Figure 1) Activities were conducted on January 13 and 28, 1993, and included <br /> measuring depth to water, purging the wells, collecting groundwater samples from wells MW2 <br />• and MW3, and sampling of soil that was previously excavated from the former diesel fuel tank <br /> location <br /> Groundwater levels were monitored on January 13, 1993 Water levels have risen <br /> approximately 0 95 feet since the previous quarterly monitoring event in October, 1992 (Table <br /> 1) The gradient cannot be calculated specifically for this site because only two wells are <br /> accessible Monitoring well MW 1 was previously inadvertently destroyed during paving <br /> activities However, RFSNA Industries has current monitoring data from the uppermost <br /> saturated zone at two Tracy sites within a one-mile radius of the subject site <br /> The local groundwater gradient can be established using January, 1993 monitoring data from <br /> 8181 Eleventh Street (Genstar Western Stone) and 6700 Grantline Road (J B Terminal) The <br /> site locations and gradient directions relative to the subject site are shown on Figure 3 The <br /> most recent groundwater gradient map and monitoring data for each site are included in <br /> Attachment 1 Groundwater flow is essentially in a northerly direction There are no known <br /> surface or subsurface occurrences at the BJJ Trucking facility which would exert a significant <br /> influence on the direction of groundwater flow Therefore, even though the direction of flow <br /> cannot be specifically determined from the on-site wells, the direction can be safely assumed to <br /> be consistent with the nearby sites Monitoring well MW2 is appropnately located to monitor <br /> groundwater downgradient from the excavation and MW3 is adequate for upgradient <br /> observations <br /> 1QR1993 FNL <br />