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a� <br /> ?� T' <br /> }AuburnBlvd., Suite A <br /> Off <br /> N1 [ RN SacrSacramento, CA 95821 <br /> ENGINEERING AND ENVIRONMENTAL SERVICE Telephone: (916) 485-7222 <br /> FAX: (916) 485-8098 <br /> 30 January 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 Storag Tanks <br /> and Piping at Edison High School <br /> Stockton Unified School District <br /> HLI 0089002 <br /> Dear Mr. Leubner, <br /> On 19 November 1990, Helmick and Lerner, I c. 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 su mary 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 smples obtained for laboratory analysis from <br /> the excavations were collected from the ba khoe bucket. Samples were collected by <br /> scraping the top several inches of soil off of he soil in the backhoe bucket with a steel <br /> trowel. The exposed soil was then quickly col ected 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 co ered with sheets of Teflon and capped with <br /> snug-fitting plastic caps. The samples were ten labelled with a unique sample number, <br /> date and time sampled, and placed in a chilled ce 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 inst aces where sampling deviated from the <br /> procedures described above, sampling procedu es 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) equipp d with a flame ionization detector (FID). <br /> This field monitoring was conducted by filli g 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 volatiliz tion of hydrocarbon constituents in the soil <br />