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*** fineon Associates 1433 North Morket 8oulevcard • Sacramento '--aifornia 95834 1443 • (916)928-3300 e Fax(916)928-3341 40 November 3, 1992 Project OG67-009 01 Mr Dave Poulsen Aegis Environmental, Inc 1050 Melody Lane, Suite 160 Roseville, California 95678 Re Fourth Quarter 1992 Ground-water Monitonng Report, 4445 Pershing Avenue, Stockton, WIC# 204-7524-2408 Dear Mr Poulsen This letter presents the results of the fourth quarter 1992 ground-water monitoring event for the Shell Oil Company (Shell) service station at 4445 Pershing Avenue, Stockton Monitoring at this site is being conducted on a quarterly basis GROUND-WATER ELEVATION SURVEY On October 8, 1992, static water levels were measured in all site wells before purging and sampling Water levels were measured to 0 01 foot from the top of the well casing using an oil/water interface probe. A summary of the monitoring well field measurement data including water-level measurements and ground- water elevations from this quarter's and four previous monitoring events is presented in Table 1 SAMPLING AND ANALYSIS Ground-water samples were collected on October 8, 1992 from monitoring wells MW-1 through MW-4 A site map, including the monlltonng well locations (MW-4 not included), is attached, as provided by Aegis Environmental Ground-water monitoring wells were purged before sampling using a polyvinyl chlonde bailer, a low-flow submersible pump, or a Teflon® baler. Samples were collected using a Teflon bailer The procedures used to purge and sample ground-water monitoring wells were detailed in our November 14, 1991 Proposal to Conduct Ground-water Monitoring for Shell Oil Company, and were included in our first quarter report Quality Control samples for fourth quarter 1992 monitoring included a trip blank and field blank