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Geological Audit Services, Inc. <br /> Gv Environmental Professionals <br /> v� 1803W.MarchLane,Suite A•Stockton,CA95207•(209)956-0264- FAX(209)956-0700 <br /> October 5, 1993 <br /> (GeoAudit 1. 33) <br /> Ms. Elizabeth Thayer IPSIVEAssociate Engineer <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD OCT p 81993 <br /> CENTRAL VALLEY REGION <br /> 3443 Routeir Road <br /> Sacramento, CA 95827-3098 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Subject: Final Remedial Plan (FRP) - Geweke <br /> 16 South Cherokee Lane, Lodi, San Joaquin County <br /> Dear Ms . Thayer: <br /> We are in receipt of your letter to Mr. Mark Geweke dated September <br /> 21, 1993 , including your September 20 memorandum to Mr. Gordon <br /> Boggs of CVRWQCB, regarding GeoAudit' s Final Remedial Plan (FRP) <br /> for the referenced site. In response, GeoAudit has the following <br /> additional information for your review. The numbers correspond to <br /> your memorandum to Mr. Boggs. <br /> 1) The GL-series of borings was drilled in February 1986 by Brown <br /> and Caldwell Consultants (BCC) of Sacramento. According to <br /> BCC ' s "Site Investigation Report" dated August 23, 1990, the <br /> descriptions of GL-3 and GL-4 were included in BCC's April 15, <br /> 1986 "Final Site Investigation Report" . The locations of these <br /> borings are shown on Figure 3-4 of the former report and on <br /> Plate 2 of PES Environmental Is Problem Assessment Report (PAR) <br /> dated July 1991 . The analytical data from borings GL-3 and GL- <br /> 4 are included in Table 2 of the August 1990 report; we used <br /> these data to further constrain the boundaries of the <br /> contaminant plumes shown on Figures 8 & 9 in the FRP. We do <br /> not have logs of these borings, and did not use them for <br /> lithological purposes (they are not shown on Figures 5 and 6 <br /> in our FRP) . <br /> As for remediation wells VW-1 through VW-4 , please refer to <br /> Figure 4 of the FRP for the design of these wells and Appendix <br /> A for the boring logs. The locations of the wells were shown <br /> on Figures 2a and 2b, and on the enclosed revised site plan. <br /> 2) A signed copy of the letter included in Appendix C of the FRP <br /> is attached. <br /> 3) The remediation wells at the site were installed to depths of <br /> 55 feet; groundwater at the site is near 60 feet. The bacteria <br /> 1 <br /> Full Spectrum Environmental Services• Hydrogeology <br />