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CONDOR EARTH TECHNOLOGIES INC l 188 Frank West Circle Suite I Stockton CA 95206 Phone 209.234.0518 rk. FAX 209.234.0538 CONDOR www.condorearth.com April 17, 2003 IJ�I APR 1 8 2003 Jeffrey C. F. Wong ENVIRONMENT HEALTH San Joaquin County PERMIT/SERVICES Environmental Health Department 304 E. Weber Avenue, Third Floor Stockton, California 95202 Re: Request for Extension of Project Implementation Due Date and Work Scope Clarification, Canepa's Car Wash, 248 Park Street, Stockton, CA, Site Code 1695, Condor Project No. 2038 Dear Mr. Wong: Condor Earth Technologies, Inc. (Condor) is in receipt of your letter dated March 18, 2003, approving, with conditions, the Work Plan for Additional Soil and Groundwater Investigation by Cone Penetrometer Testing, dated November 1, 2002, for the above referenced site. In your letter you approved the advancement of four groups of twinned cone penetrometer (CPT) borings across the street north of the above-referenced site to 150 feet below ground surface(bgs) to collect grab water samples, and one group of three borings in the area of the former underground storage tanks (UST) to 150 feet bgs to collect grab water samples and soil samples. The soil and groundwater samples are to be analyzed using EPA Method 826013, with minimum detection limits for the groundwater samples of 0.5 to 5.0 micrograms per liter (µg/L) for oxygenates, excluding ethanol(13.0 µg/L). Condor proposed implementing the work plan in two phases. The first phase consists of the advancement of the CPT borings and the collection of groundwater and soil samples for laboratory analyses. The second phase consists of the proposed installation of multi-screened, discrete depth groundwater monitor wells. Condor will prepare an addendum to the work plan after the first phase is completed and the soil and groundwater analytical results have been reviewed. The CPT data will be used to design the multi- screened wells. To move the project along quickly, Condor will need your expedited response to the work plan addendum In the addendum, Condor will make recommendations pertaining to the number and locations of multi-screened, discrete depth groundwater monitor wells to be installed, and the number and depths of screened intervals for each well. In your letter, you approved the installation of one multi- screened, discrete depth groundwater monitor well with seven screened intervals in the area of the former UST. While there is a potential to install seven screened intervals in each well, the actual number of screened intervals may vary and may be less. The number and locations of the proposed wells, both on and off site, and the number and depths of screened intervals in each well, will be based on the results of the CPT borings and the groundwater analytical results, and cannot be predicted prior to completion of the first phase of work.