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k <br /> WATERWORk CORP <br /> A RESNA Company <br /> Environmental Solutions <br /> N Through Applied S,jcnce, <br /> F Engineering&Construction <br /> 1710 Main street �E <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 DEC g '^91 <br /> Fax (209) 838-3509 <br /> I=NVIIIONWNTAL HC STH <br /> p�Rfu1T/ „Y �� December 2, 1991 <br /> Mr Harlan Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O. Box 2009 <br /> I Stockton, CA 95201 <br /> 3 <br /> RF-: Quarterly Monitoring Report, Heinz Facility, 757 East Eleventh Street, Tracy, CA <br /> I <br /> I <br /> Dear Mr. Knoll. <br /> # �a On October 22 1991 <br /> + , groundwater monitoring was conducted at the above referenced site <br /> (Figure 1). During monitoring depth to water was measured, the wells were purged, and <br /> samples were collected from wells MW2 and MW3. <br /> Water levels had dropped i I to 12 feet since the previous quarterlymonitoring <br /> event on July 10, 1991 ) g g and sampling <br /> (Table 1 The gradient cannot be calculated specifically for this site <br /> $ because only two wells are accessible (Monitoring well MWl has been paved over with <br /> asphalt ) However, RESNA Industnes/WaterWork currently monitors the uppermost saturated <br /> zone at three Tracy sites within a one-mile radius of the subject site <br /> The local groundwater gradient can be established from October 1991 monitoring data from 8181 <br /> Eleventh Street (Genstar Western Stone), 4170 S Tracy Blvd , (Tracv Estates), and 6700 <br /> Grantline Road(J B Terminal) The site locations and gradient directions relative to the subject <br /> s site are shown on Figure 2. The most recent groundwater gradient map and monitoring data for <br /> t each site are included in Attachment 2 All the gradients are essentially in a northerly direction <br /> There are no known surface or subsurface occurrences on site which would exert a significant <br /> influence on the direction of groundwater flow. Therefore, even though the direction of flow <br /> rAnnot 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 appropriately located to monitor <br /> groundwater downgradient from the excavation and MW3 is adequate for apgradient <br /> obse, 'ations <br /> t <br /> s _ <br /> E <br /> LR111591 LP <br /> i <br /> h - <br />