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GROUND ZERO ANALYSIS, INC. <br /> 3422 W. Hammer Lane, Suite C-294 <br /> Stockton, California 95219 <br /> Telephone: (209) 952-3481 <br /> Facsimile: (209) 952-9891 <br /> March 14, 1996 <br /> Ms. Linda Turkatte <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O:'Box-388_' — -– <br /> Stockton, CA 95201-0388 <br /> Subject: Hendrix & Son Trucking, Inc. <br /> 3730 Munford Avenue, Stockton,California <br /> Site Code: 1694 <br /> Dear Ms. Turkatte: <br /> This letter workplan is submitted on behalf of Hendrix & Son'Trucking;Inc. by Ground Zero Analysis; <br /> Inc. (Ground Zero) in accordance with correspondence from San Joaquin County Public Health <br /> Services, Environmental Health Division (PHS/EHD) dated February 23, 1996. The purpose of this <br /> letter is to address PHS/EHD's request for verification of subsurface conditions at the property located <br /> at 3730 Munford Avenue, Stockton, California.I The site location is shown on Figure 1. <br /> SITE BACKGROUND <br /> During a routine systems test on a regular gasoline underground storage tank in 1986 it was determined <br /> that gasoline fuel had leaked from a joint in the product piping adjacent to the tank. The use of the tank <br /> --------was-immediately�-discontir�tied land-t;zetafik-anu associate&product--lines°were-removed---The former- <br /> tank location is shown on Figure 2. <br /> On April 21 and 22, 1986 J.H. Kleinfelder & Associates advanced one soil boring in the location of <br /> the line leak to a total depth of 75 feet below grade for the purpose of installing a groundwater <br /> monitoring well (MW1). Laboratory analysis detected gasoline hydrocarbon constituents in soil samples <br /> collected from the boring at 20, 30, and 40 feet below grade, as well as in a groundwater sample <br /> collected from the well.: No gasoline constituents were detected in soil samples collected from 15 and <br /> 50 feet below grade. <br /> A second groundwater sample collected on May 27, 1988 also contained gasoline hydrocarbon <br /> constituents. However, a groundwater sample collected on June 27, 1991 contained no detectable <br /> benzene, ethylbenzene, or xylenes. Only toluene was detected at a very low level (4.3 ppb). <br />