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t RF ` � �orkmg to Restore Nature 1710 Main Street F E B i Escalon, CA 95320 •3 ka i'r i Phone (209)838-3507 d ` FAX (209)838-3509 �`�- R � " February 11, 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 January 15, 1992, groundwater monitoring was conducted at the above referenced site 1. (Figure 1) During monitoring depth to water was measured, the wells were purged, and samples were collected from wells MW2 and MW3 Water levels had dropped 0 14 feet since the previous quarterly monitoring and sampling event on October 22, 1991 (Table 1) The gradient cannot be calculated specifically for this site because only two wells are accessible (Monitoring well MW1 has been paved over with asphalt ) However, RESNA Industries/WaterWork currently monitors the uppermost saturated zone at three Tracy sites within a one-mile radius of the subject site The local groundwater gradient can be established from January 1992 monitoring data from 8181 Eleventh Street (Genstar Western Stone), 400 S Tracy Blvd , (Tracy Estates), 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 All 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 �1 LRO13192 LF