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3150 Auburn Bid,Sufte A <br />� rl! <br /> H f.L H 1 C I .� j f R N E Sacramento,CA 95821 <br /> F [ ENGINEERING AND ENVIRONMENTAL SERVICES Telephone: (916) 4857222 <br /> FAX: (916) 485-8098 <br /> 28 July 1992 t <br /> Mr. Greg Sinnigen <br /> Hess and Hess Construction, Inc. <br /> 3819 Duck Creek Drive <br /> Stockton, California 95215 <br /> Ea <br /> Subject: Underground Fuel Tank Excavation Sampling <br /> HLI 06801 <br /> Dear Mr. Sinnigen, <br /> + On 2'July 1992, Helmick & Lerner Inc. was present during the excavation of soil from the <br /> former location of an underground fuel storage tank by'-Hess and Hess Construction. It is <br /> our understanding that the tank was a 1000-gallon waste oil tank. This letter describes the <br /> procedures that were followed during the collection of the soil samples from the <br /> excavation, and the results of laboratory analyses required by the San Joaquin County <br /> Public Health Services, Environmental Health Division (PHS=EHD). <br /> SOIL SAMPLING PROCEDURES <br /> Under the direction of Linda Turakette of the PHS-EHD and Greg Sinnegan of Hess and <br /> Hess, four samples were collected for laboratory analyses. The locations of the samples <br /> are shown in Figure 1. The samples collected for laboratory analysis were obtained from <br /> the backhoe bucket by scraping off the top several inches of soil with a steel trowel. A <br /> core';sampler lined with a brass liner was driven into the soil-using a slide-hammer to <br /> collect the sample. The brass liner containing the sample 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. The samples were then immediately labelled with a unique sample <br /> number, date and time sampled, and placed in a chilled ice cooler for transport to a <br /> American Environmental Laboratory in Rancho Cordova, a State-certified laboratory, for <br /> analysis. <br /> yF Excess soil from the core sampler was monitored for the presence of hydrocarbons using <br /> a portable organic vapor analyzer (OVA) equipped with a flame ionization detector (FID). <br /> This,field monitoring was conducted by filling a glass container to approximately one-third <br /> capacity with soil and covering the container with alur'iinum foil. The container was then <br /> placed in the sun to promote volatilization of hydrocarbon constituents in the soil sample. <br /> After approximately 5 minutes, a hole was punched in the foil cover and a probe attached <br /> to the OVA was inserted into the container headspace <br />