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05-25-1993 03:10PM FROM URIAH-Modesto Office luPRO <br /> Uriah Environmental Services Inc. <br /> 0 acas�' <br /> o� o� 2401 East Oramebum Aveme#675-218,Modesto, CA 95355 <br /> O (510)455-4141 (209}551-3591 1209=551-1200 <br /> San RasrlKWMW AM t"otrar Va&Y MX <br /> May 24, 1993 <br /> Mr. Michael .Infurna <br /> Senior REBS , <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P..O. Box 2009 <br /> Stockton, CA 95201 ENVIRONMENTAL H�L ALTH <br /> PERMITISERVICH <br /> RE: Reeves Exxon, 2360 East Road, Tracy, C.A. PAS/EHD site <br /> #1397. <br /> Dear Mr. Infurna: <br /> on January 22, 1993, Uriah Environmental. Services, Inc. authored <br /> a letter to lir- Gerald Sperry, attorney for the Pestana Trust <br /> (owner of the above referenced site) , in which recoimendations <br /> were made concerning the performance of feasibility studies <br /> to determine if Soil vapor Extraction-Sioventing and/or Rio- <br /> remediation would be appropriate methods of addressing hydro- <br /> carbon contamination of soil and groundwater at the site. <br /> Mr. Sperry has since provided Uriah with a copy of your February <br /> 17, 1993 response to our letter. In that response, you stated <br /> that the boundary of any contamination existing at the northeast <br /> corner of the site needed to be established. Although the <br /> aforementioned technologies are• remedial in nature, we believe <br /> that the data acquired during the proposed feasibility study, <br /> as well as that previously acquired by the Water Works Corp. <br /> (a RESNA Company) , would be sufficient to delineate soil and <br /> groundwater contamination if it was used to develop a well <br /> testedplume model information that would be acquired during <br /> the feasibility study would include concentrations of vapor <br /> and liquid phase hydro- carbons, physical and chemical properties. <br /> of soil, chemical and endemic biotic reactions to target organic , <br /> chemicals, as well as the degradability and volatility of Lhasa <br /> chemicals.. We' would hope to complete the study without install-- <br /> ing vapor .,extraction wells. <br /> Of the several models available, we recommend the use of SUTRA. <br /> SUTRA is a computer program developed by the U.S. Air Force <br /> and the. 'v-S- Geological Survey that simulates fluid movement <br /> and the transport of either energy or dissolved substances in <br /> a subsurface environment. The model employs a two-dimensional <br /> hybrid finite element and integrated finite difference method <br /> to approximate the governing equations that describe the two <br /> Interdependent processes that ra simulated. SUTRA provides <br /> fluid pressures and either solute concentratii]rns or temperatures, <br />