SITE INFORMATION AND CORRESPONDENCE FILE 1

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G0010gcc11 trechnics l�tc. 1101 7'h street Modesto,California 95354 (209)522-41 19/Fax#522-4227 ENVIRONMENT HEALTH pERM1T�SERVICES - January 21, 2003 Project No.: 723.2 Project Name: Valentine (El Dorado St.) Ms. Linda Sanborn State Water Resources Control Board 2014 T Street, Suite 130 P.O. Box 944212 Sacramento, CA 94244-2120 RE: Cost Pre-Approval: Site Characterization Work Plan Location: 2315 N. El Dorado St., Stockton, CA County Site Code: 9401; USTCFP Claim #0417 i Dear Ms. Sanborn: On November 30, 2001, Geological Technics Inc. (GTI) submitted an Additional Site Characterization Report that documented the installation of a deep, discretely screened i monitoring well at the above site. Analytical data shows the presence of gasoline range petroleum hydrocarbons in the soil and groundwater to a depth of at least 150 feet bgs. In a letter dated April 29, 2002, Mr. Jeff Wong of SJC PHS/EHD issued a letter directing that a work plan for the investigation of the lateral and vertical definition of the plume be submitted by July 1, 2002. GTI submitted a "Additional Site Characterization Work Plan" dated June 27, 2002 to SJC PHS/EHD. The work plan included provisions for installing one additional on site deep screened well, and three off site well clusters consisting of a shallow, intermediate and deep well at each location. In their October 22, 2002 correspondence, SJC PHS/EHD approved the GTI work plan with modifications: the deep screened well and the off site well clusters were disapproved. Instead, SJC PHS/EHD required that continuous multi-chambered tubing (CMTTM) wells be used instead of discretely screened, multiple PVC wells. In addition, SJC PHS/EHD also required that the first boring be continuously sampled to determine off site- lithology. In our October 29, 2002 work plan addendum, GTI acknowledged the changes mandated by SJC PHS/EHD. Proposed Direction of Project This opinion of cost includes the following work: • Drill three deep boreholes to a maximum depth of 100 feet. • Obtain 3 soil samples from each borehole for laboratory analysis. • Construct and install one continuous multi-chamber tubing (CMTTM) monitoring well with three screened intervals in each borehole. • Prepare and submit report on the installation of the CMTTM wells. • Perform one year(four consecutive quarters) of groundwater monitoring-seventeen wells. • Prepare and submit reports for the quarterly monitoring reports. i i