SITE INFORMATION AND CORRESPONDENCE

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�., ENER Uriah Environmen ��, ��s Inc. U O O 00 8 ppq ., LJ 000 00 2401 East Orangeburg Avenue# �2,*DdpAb� $$5355 0 0 (510)455-4991 (209)551-3591 (209) 551-1200 San Francisco/Bay Area Central Valley FAX May 24 , 1993 Mr. Michael Infurna Senior REHS San Joaquin County Public Health Services Environmental Health Division P.O. Box 2009 Stockton, CA 95201 RE: Reeves Exxon, 2360 East Road, Tracy, CA. FHS/EHD Site #1397. Dear Mr. Infurna: On January 22 , 1993, Uriah Environmental Services, Inc . authored a letter to Mr. Gerald Sperry, attorney for the Pestana Trust (owner of the above referenced site) , in which recommendations were made concerning the performance of feasibility studies to determine if Soil Vapor Extraction-Bioventing and/or Bio- remediation would be appropriate methods of addressing hydro- carbon contamination of soil and groundwater at the site. Mr. Sperry has since provided Uriah with a copy of your February 17, 1993 response to our letter. In that response, you stated that the boundary of any conta-m-knation_ existing at the northeast corner of the- -s-i-te needed to be established. Although the aforementioned technologies are remedial in iiat„re, we believe that the data acquired during the proposed feasibility �tuay, _ as well as that previously acquired by the Water works Corp. (a RESNA Company) , would be sufficient to delineate soil and groundwater contamination if it was used to develop a well tested plume model . Information that would be acquired during the feasibility study would include concentrations of vapor and liquid phase hydrocarbons, physical and chemical properties of soil, chemical and endemic biotic reactions to target organic chemicals, as well as the degradability and volatility of these chemicals. We would hope to complete the study without install- ing vapor extraction wells. Of the several models available, we recommend the use of SUTRA. SUTRA is a computer program developed by the U.S. Air Force and the U.S. Geological Survey that simulates fluid movement and the transport of either energy or dissolved substances in a subsurface environment. The model employs a two-dimensional hybrid finite element and integrated finite difference method to approximate the governing equations that describe the two interdependent processes that are simulated. SUTRA provides fluid pressures and either solute concentrations or temperatures, 1 .