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1620 Executive Court <br /> !!r <br /> 111. <br /> C I m1, f fffff Sacramento,CA 95864 <br /> ENGINEERING AND ENVIRONMENTAL SERVICES Telephone: (916) 485-7222 <br /> FAX: (916)485-8098 <br /> 6 February 1998 <br /> Mr. Charles Leubner <br /> Stockton Unified School District cA Z <br /> 1932 N. El Pinal Drive <br /> Stockton, California.95205 <br /> Subject: Work Plan for Soil Investigation <br /> Edison High School <br /> Stockton Unified School District <br /> HLI 00817 <br /> Dear Mr. Leubner: <br /> This work pian describes a proposed soil investigation at the former site of an underground <br /> storage tank located at Edison High School. It is submitted in response to the 10 December 1997 <br /> letter from Mr. Steve Sasson of the Public Health Services, San Joaquin County Environmental <br /> Health Division (PHS/BHD) stating that the ver±i al extent of contamination beneath Tank #1 <br /> needs to be established. Soil samples, and if necessary, groundwater samples will be analyzed <br /> for diesel range hydrocarbons. The soil investigation is intended to evaluate the depth to which <br /> diesel range hydrocarbons have migrated beneath t e concrete cradle on which the 10,000-gallon <br /> diesel tank was resting. <br /> In order to accomplish this task, we recommend e drilling of two slant borings lateral to the <br /> former tank location. Drilling will continue un it the soil appears to be free of petroleum <br /> hydrocarbon contamination or until groundwater s encountered, at which time a groundwater <br /> sample will be collected. A scope of work and sch Jule for this investigation is presented below. <br /> BACKGROUND <br /> On 19 November 1990, a 10,000-gallon underground diesel tank was removed from an <br /> excavation located at Edison High School (refer to Figure 1). Five soil samples were collected <br /> from the excavation at locations shown on Figure 2 and submitted for laboratory analysis. Four <br /> of the five samples contained diesel range hydro arbons above the laboratory reporting limit. <br /> The results of the laboratory analyses are presen ed in Table 1. Based on these findings, an <br /> additional soil investigation was requested to estaU ish the vertical extent of contamination. <br />