SITE INFORMATION AND CORRESPONDENCE FILE 1

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GGeofogicalTechnics Inc. 2741 River Rga6 �'. 52 M.Ago,Cafifo 95351 (209)538-64241Fa{#53&5852 April 10, 1998 Project No.: 425.2 Project Name: George's Service (Durham Ferry Rd) Mr. Jim Munch State Water Resources Control Board 2014 T Street, Suite 130 P.O. Box 944212 Sacramento, CA 94244-2120 - RE: Cost Pre-Approval for Additional Site Characterization George's Service, 1600 Durham Ferry Road, Tracy, CA LOP Site Code No.: 1550; USTCFP Claim No.: 8475 Dear Mr. Munch: In a written request dated August 29, 1997, Ms. Mary Meays, Senior REHS for San Joaquin County Public Health Services, Environmental Health Division (PHSEHD) requested additional soil and groundwater characterization.work be performed at George's Service, 1600 Durham Ferry Road, Tracy, CA. Ms. Meays no longer works for PHSEHD and Ms. Carol Oz has taken her place. On behalf of George and Mei Teranishi, Geological Technics Inc. has prepared the following Cost Pre-Approval for additional site characterization work. Geological Technics Inc. (GTI) has evaluated the existing soil and groundwater data, reviewed the site and project needs with the PHSEHD personnel, prepared the enclosed work plan dated October 3, 1997 addressing the need for further investigation. The significant aspects of this site are that: • Free phase product is present in the area of the former .underground tanks. Soil and groundwater contamination exists over most of the subject property and appears to have spread off site to some unknown distance. • Groundwater contamination has been observed to a depth of 50 feet bgs near the source area. • Groundwater gradient is to the north. • There is a vertical component to groundwater gradient approximately equal to the horizontal gradient. • Two domestic wells are located approximately 125 to 150 feet down gradient. • The 80 to 100 foot aquifer is heavily used for domestic wells in this area and there are 8 domestic wells within a 500 foot radius of the site. It is recognized that the scope of work for this site is aggressive for the purposes of bringing clear resolution to the risk the chemicals at this site poses to public health and the environment. But for the reasons listed above, this site is considered a high risk groundwater contamination site by PHSEHD. Upon review of the case file and further discussion of the project with Ms. Oz, she approved the work plan on April 1, 1998.