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rAMlrAMAM <br /> Working to Restore Nature <br /> `117 <br /> U <br /> 1710 Main Street <br /> Escalcn, CA 95320 cc_• ',Z—' <br /> Phone: (209)838-3507 <br /> FAX: (209) 838-3509 <br /> September 17, 1992 <br /> RECjr ft . <br /> Ms. Cori Condon <br /> CaLfornia Regional Wate- Quality Control Board <br /> 3443 Routier Road, Suite A C/ <br /> tit <br /> Sacramento, California 95827-3098 Opt O Ag Mi <br /> @(ftQt <br /> RE: Project Status Update Report, Subsurface Investigation at Banner Island Property, <br /> Stockton, CA. <br /> Dear Ms. Condon: <br /> This letter report details RESNA Industries' (RESNA) activities relating to a subsurface <br /> investigation at the above referenced site (Figure 1). Recent activities have included monitoring <br /> of groundwater, sampling for California Title 22 metals from the nine monitoring wells on-site, <br /> olids from three wells on-site, sampling for volatile organics from <br /> sampling for total dissolved s <br /> two wells on-site, and evaluating the groundwater gradient beneath the site. A groundwater <br /> sample was also collected from a monitoring well on an adjacent site for comparison purposes. <br /> Groundwater Samytina <br /> RESNA personnel performed additional groundwater monitoring on August 6, 1992. Field work <br /> consisted of measuring the depth-to-water (DTW) <br /> and screening the water from wells MW-1 <br /> through MW-9 at Banner Island for dissolved solids using a field electrical conductivity meter. <br /> The water table elevation has remained approximately the same since the previous samp <br /> event on March 18, 1992. The groundwater monitoring data is summarized in Table 1. <br /> { Three groundwater monitoring wells located at the former Western Pacific Railroad property <br /> (WPRR-MW1 through MW-3) were also monitored on August 6, 1992. This site is located <br /> directly northwest of the Banner Island property and subsurface investigations are being <br /> n data for this site is summarized <br /> conducted concurrently at both sites. The groundwater elevatio <br /> in Table 1A. <br /> RMRTTU,R09o9 -WL � <br />