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I <br /> C E, T <br /> CONDOR EARTH TECHNOLOGIES INC. <br /> 1125 N. Golden State Blvd, 188 Frank West Circle <br /> Suite G Suite I <br /> Turlock, CA 95381 Stockton, CA 95206 <br /> (209) 668-9234 (209) 234-0518 <br /> FAX (209) 668-9248 FAX (209) 234-0538 <br /> May 18, 1999 <br /> Mr, Ron Rowe <br /> San Joaquin County PHS/EHD <br /> P.O. Box 388 <br /> Stockton, CA 95202-0388 <br /> Re: Canepa's Car Wash, 6230 Pacific Ave., Stockton, CA <br /> Dear Mr, Rowe: <br /> The purpose of this letter is to document our discussion of the Canepa's Car Wash site referenced <br /> above. The discussion was held in your office on March 22, 1999 and attended by you, Dr. John <br /> Kramer (Condor), and myself. <br /> Following review of the Work Plan — Soil Boring and Monitor Well Installation, dated <br /> November, 1998, prepared by Condor Earth Technologies, Inc. (Condor), you instructed Condor <br /> to modify the work plan to include a vertical component to the groundwater plume investigation. <br /> Based upon your experience from neighboring sites, you indicated that the plume may be as deep <br /> as 100 ft. below the ground surface. <br /> You requested Condor to research the historic groundwater elevations of the site as related to <br /> installation of the fust UST's. You further suggested that the use of a cone penetrometer testing <br /> (CPT) drilling rig would aid in understanding the complex geology of the site. Based upon your <br /> experience, you recommended that discrete, highly permeable zones are present beneath the site. <br /> The use of a CPT will aid in determining the well screen placement to isolate the highly <br /> transmissive zones and better investigate vertical groundwater plume characteristics. <br /> In addition, you requested that Condor investigate the source of the groundwater mound located <br /> in the vicinity of MW- 1 and MW-2. Finally, you have instructed Condor to maintain the <br /> operation of the soil vapor extraction system that was started March 15, 1999. <br /> In response to your requests, Condor proposes to install three CPT borings on the site. The <br /> borings will be placed in the south-center, the northeast, and the southeast portions of the site. In <br /> addition, at least three additional monitor wells will be installed. These wells will be in addition <br /> to those already proposed for the investigation of the groundwater table, as described in the <br /> November, 1998 work plan. <br /> ENVIRONMENTAL GEOLOGICAL ENGINEERING GEOTECHNICAL <br /> http://www.condarearth.com <br />