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�.. u 14-W <br /> 11! Auburn Blvd., Suite A <br /> Sacramento, <br /> � I Sacramento, CA 95821 <br /> ENGINEERING AND ENVIRONMENTAL SERVICES Telephone: (916) 485-7222 <br /> FAX: (916)485-8098 <br /> 25 March 1991 <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 Stagg High School <br /> Stockton Unified School District <br /> HLI 0089002 <br /> Dear Mr. Leubner, <br /> On 20 December 1990, Helmick and Lerner, Inc. was present during the removal of two <br /> underground storage tanks from Stagg High School located at 1621 West Brookside Road <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 removal of <br /> the tanks and associated piping and the results of laboratory analyses of samples collected <br /> 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 quickly collected by driving a core sampler containing a brass <br /> liner into the soil using a slide-hammer. The brass liner was then removed from the core <br /> sampler and the ends of the liner were covered with sheets of Teflon and capped with snug- <br /> fitting plastic caps. After collection, the samples were then labelled with a unique sample <br /> number, date and time sampled, and placed in a chilled ice cooler for transport to a State- <br /> certified laboratory for analysis. A copy of the chain-of-custody form that accompanied <br /> the samples is attached to this letter. <br /> Samples from below the piping and remote fill were collected by driving the core sampler <br /> directly into the native soil using the slide hammer after the backhoe was used to excavate <br />