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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Fscalon, California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> June 24, 2005 <br /> Mr. Jeffrey Wong <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Work Plan to Evaluate Potential Effect of Water <br /> Supply Well on Dissolved Contaminant Plume <br /> Speedy Mart, 8200 N. Highway 99, Stockton, CA <br /> Dear Mr. Wong: <br /> This work plan is submitted to present a proposed scope of work to evaluate the potential effect <br /> of pumping from the Site's private domestic well (PDW) on the dissolved contaminant plume at <br /> the subject site. The work plan was prepared in response the May 18, 2005 letter from San <br /> Joaquin County Environmental Health Department (EHD). Figure 1 shows the physical location <br /> of the site. Figure 2 presents a site plan showing the locations of site monitoring wells and the <br /> water supply well. The water supply well is screened from approximately 335 to 395 feet below <br /> ground surface (bgs). <br /> The objective of the work plan is to conduct a qualitative assessment of the potential effect of <br /> pumping from the PDW on the dissolved contaminant plume while minimizing the potential of <br /> pulling down the contaminants. <br /> SCOPE OF WORK <br /> In order to evaluate whether the PDW is in hydraulic communication with the C Zone aquifer, <br /> and thus could exert an influence on the plume, Ground Zero proposes to conduct a limited pump <br /> test on the PDW. Ground Zero will pump groundwater from the PDW and measure the water <br /> level response in nearby monitoring wells MW7 (A Zone, screened from 52 to 72 feet bgs), <br /> MW14B B Zone screened from 109 to—T24 feet bgs), and MW13C (C Zone, screened from 202 <br /> to 222 feet bgs). <br /> I <br /> Since no data is available regarding the performance of the facility well, Ground Zero used the <br /> G:\GROUNDZE\TULEBURG\Rcpons\wotkplan\WPpumptest_rcv2.doe <br /> i' <br /> I <br />