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r� 6 U(Cx 5 ENVIRONMENTAL HEALTH Working to Restore Nature PERM IIT�/SERVICES 1710 Main Street Escalon, CA 95320 Phone (209) 838-3507 FAX (209)838-3509 May 4, 1992 Mr. Harlan Knoll San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, CA 95201 RE: Quarterly Monitoring Report, Heinz Facility, 757 East Eleventh Street, Tracy, CA Dear Mr Knoll. On April 9, 1992, groundwater monitoringwas conducted at the above referenced site (Figure ( gu e 1) During monitoring, depth to water was measured, the wells were purged, and samples were collected from wells MW2 and MW3 Water levels had risen approximately 0 6 feet since the previous quarterly monitoring and sampling event on January 15, 1992 (Table 1) The gradient cannot be calculated specifically for this site because only two wells are accessible (Monitoring well MW 1 has been paved over with asphalt) 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 from April, 1992 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 2 The most recent groundwater gradient map and monitoring data for each site are included in Attachment 2 The gradients are essentially in a northerly direction There are no known surface or subsurface occurrences on site which would exert a significant influence on the direction of groundwater flow Therefore, even though the direction of flow cannot be specifically determined from the on-site wells, the direction can be safely assumed to be consistent with the nearby sites Monitoring well MW2 is appropriately located to monitor groundwater downgradient from the excavation and MW3 is adequate for upgradient observations LRO50492 LF