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Ellet® <br />' ENSR International <br /> • 10411 Old Placerville Road <br /> 08 <br /> February 1fi, 2005 � <br /> V10 <br /> oo <br /> FEB 1F -! 96 362-8100 <br /> nsr com <br />' ENVIRONMENT HEALTH <br /> Mr Jeff Wong PERMIT/SERKES <br />' <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, California 95202 <br />' <br /> RE, Quarterly Groundwater Monitoring Results Report, Fourth Quarter 2004 <br /> Stockton Scavenger Association Facility <br /> 1240 Navy Drive, Stockton, California <br /> Dear Ms Dietz <br /> ENSR Corporation (ENSR) has been authorized by Norcal Waste Systems Inc (Norcal Waste) <br /> to perform quarterly groundwater monitoring at the site located at 1240 Navy Drive, Stockton, <br /> California (Figure 1) The locations of former and current site features are Illustrated on <br /> Figure 2 Quarterly groundwater monitoring Is Intended to evaluate the distribution of petroleum <br /> hydrocarbon constituents in groundwater beneath the site This report summarizes analytical <br /> results for groundwater samples collected at the site during the fourth quarter 2004 The work <br /> was performed in accordance with the field methods and procedures included in Attachment A <br /> Groundwater Level Measurements <br /> Depths to groundwater were measured in monitoring wells MW-1 through MW-4 on <br /> November 8, 2004 These measurements are presented in Table 1, and were used to construct a <br /> groundwater elevation contour map Included as Figure 3 In general, groundwater appears to <br /> flow southeast with a gradient of 0 004 feet per foot (ftlft) Copies of the groundwater sampling <br /> information sheets are included in Attachment B A summary of groundwater elevations <br /> measured to date is presented in Table 1 <br /> Groundwater Samplinci and Analytical Results <br /> Groundwater samples were collected from monitoring wells MW-1 through MW-4 on <br /> November 8, 2004 Groundwater samples were submitted to California Laboratory Services <br /> (CLS) in Rancho Cordova, California, under chain of custody protocol CLS analyzed the samples <br /> I for benzene, toluene, ethylbenzene and total xylenes (BTEX) by EPA Method 8021, total <br /> petroleum hydrocarbons as gasoline (TPHg) and total petroleum hydrocarbons as diesel (TPHd) <br /> by EPA Method 8015M, and methyl tertiary butyl ether(MTBE) by EPA Method 8260B <br /> • J 1Projects1050271031LWorianglReports105027-0314th Qtr 04-QMR doc <br /> I <br /> ® Celebrating 35 Years of Excellence in Environmental Services <br />