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,/ <br />►►► NfLMICK�LfRNfR <br />ENGINEERING AND ENVIRONMENTAL SERVICES <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 Edison High School <br />Stockton Unified School District <br />HLI 0089002 <br />Dear Mr. Leubner, <br />3750 Auburn Blvd.. Suite A <br />Sacramento. CA 95821 <br />Telephone: (916) 485-7222 <br />FAX: (916) 485-8098 <br />30 January 1991 <br />" On 19 November 1990, Helmick and Lerner, Inc. was present during the removal of two <br />underground storage tanks from Edison High School located at 1425 South Center Street <br />in Stockton, California. The removal of the tanks was performed by Stockton Service <br />Station Equipment Company, Inc. of Stockton, California. The location of the tanks is <br />shown in Figure 1. Presented below is a summary of observations noted regarding the <br />extent of soil containing petroleum hydrocarbons that was encountered during the tank <br />removals and the results of laboratory analyses of samples collected from the excavation. <br />SAMPLING PROCEDURES <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 />trowel. The exposed soil was then quickly collected by driving a core sampler containing <br />a brass liner into the soil using a slide -hammer. The brass liner was then removed from the <br />core sampler and the ends of the liner were covered with sheets of Teflon and capped with <br />snug -fitting plastic caps. The samples were then labelled with a unique sample number, <br />date and time sampled, and placed in a chilled ice cooler for transport to a State -certified <br />laboratory for analysis. A copy of the chain -of -custody form that accompanied the samples <br />is attached to this letter. For those Instances where sampling deviated from the <br />procedures described above, sampling procedures that were employed are noted below. <br />During the sampling the soil was monitored for the presence of hydrocarbons using a <br />portable organic vapor analyzer (OVA) equipped with a flame ionization detector (FID). <br />This field monitoring was conducted by filling a glass jar to approximately one-third <br />capacity with soil and sealing the container with an airtight screwtop lid. The container <br />was then placed in the sun to promote volatilization of hydrocarbon constituents in the soil <br />