SITE INFORMATION AND CORRESPONDENCE

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- . r ,I'-I I.- € GROUND ZERO ANALYSIS, INC. T ' 3422 W. Hammer Lane, Suite C-294- - - �' �`'' 56 Stockton, California 95219 Telephone: (209) 952-3481 Facsimile: (209) 952-9891 December 14, 1995 Ms. Linda Turkatte San Joaquin County Public Health Services Environmental Health Division P.O. Box 388 Stockton, CA 95201-0388 Subject: Hendrix & Son Trucking, Inc. 3740 Munford Avenue, Stockton, California Site Code: 1694 Dear Ms. Turkatte: This letter is submitted on behalf of Hendrix & Son Trucking, Inc. by Ground Zero Analysis, Inc. (Ground Zero) in accordance with correspondence from San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) dated August 29, 1995. The purpose of this letter is to address PHS/EHD's request for additional information on the subject site. The site location is shown on Figure 1. Site Background During a routine systems test on a regular gasoline underground storage tank in 1986 it was determined that gasoline fuel had leaked from a joint in the product piping adjacent to the tank. The use of the tank was immediately discontinued and the tank and associated product lines were removed. The former tank location is shown on Figure 2. On April 21 and 22, 1986 J.H. Kleinfelder & Associates advanced one soil boring in the location of the line leak a total depth of 75 feet below grade for the purpose of installing a groundwater monitoring well (MW1). Laboratory analysis detected gasoline hydrocarbon constituents in soil samples collected from the boring at 20, 30, and 40 feet below grade, as well as in a groundwater sample collected from the well. No gasoline constituents were detected in soil samples collected from 15 and 50 feet below grade. Tabulated results of soil and groundwater analytical results are included in Attachment A. A second groundwater sample collected on May 27, 1988 also contained gasoline hydrocarbon constituents. However, a groundwater sample collected on June 27, 1991 contained no detectable benzene, ethylbenzene, or xylenes. Only toluene was detected at a very low level (4.3 ppb). Additional attempts to sample groundwater in April 1992 and March 1993 were unsuccessful because the groundwater level had dropped below the bottom of the well.