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f :✓ Wright <br /> Environmental <br /> Services, Inc. <br /> Construction • Engineering ♦ Remediah'on <br /> October 6, 1999 <br /> Project No.4090-P <br /> Cox and Cox <br /> P. 0. Box 1046 <br /> Tracy, California 95378 <br /> Atm: Mr. Elroy Cox <br /> Re: Response to PHS-EHD Letter of July 28, 1999 with <br /> Technical Summaries from Previously Submitted Reports, <br /> Site at 595 East I Ith Street,Tracy,CA <br /> Dear Mr. Cox, <br /> Wright Environmental Services, Inc. (WRIGHT) has prepared response to the San Joaquin County Public Health <br /> Services Environmental Health Division (PHS-EHD) in their letter dated July 29, 1999 for the above referenced <br /> site. As you know, several phases of work have been performed at this site. This letter was prepared to address <br /> several questions and comments that the PHS-EHD forwarded. These responses will be presented in the same order <br /> as the PHS-EHD letter. <br /> Introduction <br /> This response incorporates material from reports previously submitted to PHS-EHD for the site. Initial site studies by <br /> other consultants and groundwater monitoring reports have been completed, brief summaries of which are included <br /> (see References). According to EVAX (1992) and Remediation Risk Management(1993), five underground storage <br /> tanks were removed (one 8,000-gallon gasoline, one 7,500-gallon premium gasoline and two 4.000-gallon for <br /> unleaded gasoline, and one waste oil tank was reportedly removed). Thirteen soil samples were reportedly collected <br /> and chemically analyzed at FGL Environmental of Stockton. California. Those samples indicated petroleum <br /> hydrocarbon leakage in the immediate tank pit vicinity. A summary of the available soil data from these studies is <br /> presented in Table 1. In addition, EVAX also performed a soil vapor survey, the results of which were used to locate <br /> the initial three groundwater monitoring wells. Wright later installed additional monitoring wells. <br /> WRIGHT will present the responses for PHS-EHD with material previously submitted that include some revisions in <br /> interpretations given our continuing review of the data. <br /> Response to Soil Contamination Extent <br /> Site investigation data has been presented which has discussed the soil(meaning the vadose soil region)contaminant <br /> extent. The vadose soil region is affected only minimally(see Geologic Cross Sections and Tables 1 and 2 Historic <br /> soil and groundwater chemical analytical data). The contaminants have migrated along the capillary fringe along the <br /> uppermost region of the aquifer. The previous consultants (Remediation Risk Management and EVAX <br /> Technologies)had performed the initial monitoring well installation. The soil data contained in their reports showed <br /> minimal vadose soil contamination except in the immediate tank pit vicinity. WRIGHT drilled exploratory borings at <br /> the former tank pit perimeter and the borings revealed that contaminants were not detected. Vadose zone <br /> contamination is not present on the basis of these borings and previous work. However, the data clearly show <br /> capillary migration and dissolved groundwater pathways. <br /> 67 E. 10th Street . Tracy,CA 95376 <br /> 209.833.0758 . Fax 209.832.5152 <br /> wright(winreach.com Lic. #651501 A-B H=Mat A <br /> Mr. Ed's Muffler websit hnp:dWWh9QANac#Q9ARriglrt Page 1 +i� <br />