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r, LIP <br /> 1 ! f SacrAuburn BlvdSuite A <br /> Sacramento,CA 955 821 <br /> ENGINEERING AND ENVIRONMENTAL sEA VICES Telephone: (916)485-7222 <br /> FAX; (916)4811-8098 <br /> 12 December 1990 <br /> Mr. Charles Leubner <br /> Stockton Unified School District <br /> 1932 N. El Pinal Drive <br /> Stockton, California 95205 <br /> Subject: Removal of Underground Storage Tanks <br /> and Piping at Franklin High School <br /> Stockton Unified School District <br /> HLI 0089002 <br /> Dear Mr. Leubner, <br /> - During 25 October to 31 October 1990, Helmick and Lerner, Inc. was present during the <br /> removal of two underground storage tankF from the Fran?;!in High School facility located <br /> at 300 North Gertrude Avenue in Stockton, California. The removal of the tanks was <br /> performed by Stockton Service Station Equipment Company, Inc. of Stockton, California. <br /> The location of the tanks is shown in Figure 1. Presented below is a summary of <br /> r, <br /> observations noted regarding the extent of the contamination that was encountered during <br /> the tank removals and the results of laboratory analyses of samples collected from the <br /> excavation. <br /> f <br /> SAMPLING PROCEDURES <br /> During the excavation of the soil around the tanks the soil was monitored for the presence <br /> of hydrocarbons by using a portable organic vapor analyzer (OVA) equipped with a flame <br /> ionization detector (FID). This field monitoring was conducted by filling a glass jar to <br /> approximately one-third capacity with soil and sealing the container with an airtight <br /> screwtop lid. The container was placed in the sun to promote volatilization of hydrocarbon <br /> constituents In the soil sample. After approximately 15 minutes a hole was punched in the <br /> lid of the container and a probe attached to the OVA was Inserted In the container <br /> headspace.The concentration of organic vapor in parts per million by volume was then read <br /> and noted. Field screening also included visual observation of samples to note changes in <br /> color or appearance which might suggest the presence or absence of contamination. <br /> Due to safety considerations,most of the soil samples obtained for laboratory analysis from <br /> the excavations were collected from the backhoe bucket. Samples were collected by <br /> scraping the top several inches of soil off of the soil in the backhoe bucket with a steel <br /> _ <br /> trowel. The exposed soil was then'quickly collected by driving a core sampler lined with <br /> .1 <br /> J a brass liner into the soil using a slide-hammer. The brass Iiner containing the sample was <br /> r <br /> L <br /> f <br /> - JE <br /> ;1 <br />