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Soil Investigation Work Plan Heritage Square Page 4 Each sample end will be covered with TeflonO sheetmg, the ends scaled with plastic end caps, and labeled. Core holes will be advanced through the concrete floor Inside the Heritage Square building at the location g y underground of the under d fuel line identified b Cruz Brothers. The location of the fuel line will then f be confirmed by hand auguring. Soil samples will be collected from approximately two feet below each end of the underground fuel line and at twenty linear foot intervals thereafter. The soil samples will be collected using a rod-mounted sampling tool or by'hand, depending on access. The soil samples will be collected in clean brass or stainless steel sampling tubes. All soil samples selected for laboratory analyses will be stored in a cooler chilled with ice and delivered under chain-of-custody procedures to a I California Certified Laboratory and analyzed using U.S. EPA Methods and California-approved methods under quality assurance measures. Prior to use, the soil sampling equipment will be cleaned by washing in a solution of laboratory-grade, non-phosphate detergent and hydrocarbon-free water, and double rinsing with hydrocarbon-free water. The soil cuttings will be placed in 55-gallon drums, sealed, labeled, and left on-site to await disposal k pending results of the laboratory analysis. 3.4 GROUNDWATER SAMPLING If groundwater sampling is warranted, one groundwater sample will be collected .with a Geoprobe groundwater sampler. The sampler utilizes a scaled, watertight, stainless steel sample chamber and PVC screen which is isolated from the surrounding environment as the sampler is advanced. When the desired depth for collection of a groundwater sample is reached, the sample chamber is opened by !.� pulling back on the body of the sampler and exposing the screen. A groundwater sample is retrieved using a small diameter stainless steel bailer. M1 The groundwater will be gently emptied from the bailer into the appropriate laboratory supplied containers. The sample containers will be sealed; labeled, and placed in a cooler chilled with ice for delivery under chain-of-custody procedures to a California Certified Laboratory for analyses. 3.5 LABORATORY ANALYSES The soil samples and groundwater sample(s); if warranted, will be analyzed for total petroleum hydrocarbons quantified as kerosene, diesel and motor oil by EPA Method 8015m, for Methyl tertiary- Butyl Ether (MTBE), and for benzene, toluene, ethyl benzene, and total xylenes (BTEX) by EPA Method 8020. The detection of MTBE will be confirmed by EPA Method 8260B. The analytical methods and analytical detection limits are presented in Table 2. i CONDOR 1