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Page 1 of 1 <br /> Margaret Lagorio [EH] <br /> From: Jeanne Homsey [Jeanne.homsey@atcassociates.com] <br /> Sent: Friday, October 31, 2008 12:24 PM <br /> To: Margaret Lagorio [EH] <br /> Subject: Three Palms Grocery FRP Oct 1, 2008 Addendum Email <br /> Per our conversation on October 30, 2008, ATC has prepared this email to serve as an addendum to the Final <br /> Remediation Plan (FRP) prepared for the Three Palms Grocery site located at 6732 E. Hwy 88, Stockton, CA. <br /> ATC proposes to install and operate a vaopr extraction system utilizing four existing vapor wells and one new <br /> vapor well. ATC proposes to utilize all the vapor wells to ensure sufficient radius of influence coverage of the <br /> area of soil impact and reduce the overall length of operation. Pilot test conducted on VW2 and VW3 <br /> showed TPHg concentrations in vapor ranging from 310 to 1,000 ppmv. Vapor samples were not collected from <br /> VEW1. Vapor well VW5 is proposed east of boring MW5 which had TPHg concentrations of 1,900 ppm in soil. <br /> While installing the proposed well, ATC will monitor soil samples with a PID to ensure optimal interval of the well <br /> screen. After system startup, ATC will monitor vapors from each vapor well with a PID to optimize system <br /> operation. A sample port dedicated to each vapor well will be located at the manifold within the treatment <br /> compound. The sample ports were inadvertently omitted from Figure 10 of the FRP. <br /> Let me know if you have additional questions. Thank you. <br /> Jeanne Hornsey, PE I Branch Manager I ATC Associates Inc. I Modesto, CA <br /> 209-579-2221 ext 102 1 209-601-9731 mobile <br /> 1117 Lone Palm Ave. I Suite B I Modesto, CA 95351 <br /> 209-579-2221 tel 1 209-579-2225 fax I www.atcassociates.com <br /> 10/31/2008 <br />