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0 0 SOIL SAMPLING AND LABORATORY ANALYSIS Soil sampling was performed on October 15, 1993. The location of the soil sample in the tank excavation is shown in Figure 3 (Appendix A) and was chosen by Bill Snavely. Because there was less than 20 linear feet of product piping, and the soil beneath the piping was removed down to 8.5 feet below grade, no soil sample beneath the underground piping was collected. Soil samples were collected by Mr. David Castro, an LLNL Environmental Protection Department Sampling Technician. Soil sample collection was witnessed and documented by Mr. Nick Giuntoli, a Kaiser Engineers Livermore Environmental Scientist II. One tank excavation soil sample was collected using a hand-driven soil tube holder with extension rods. One soil sample was collected from the excavated soil pile. Soil samples were collected in decontaminated stainless steel tubes leaving no headspace. The ends of each tube were covered with a Teflon® sheet and sealed with plastic end caps. Samples were labeled with their sample identification number and date of collection. All samples were stored in a cooler on ice and logged on to a Chain of Custody Sheet, see Appendix D. All samples were delivered to California Laboratory Services, Inc. (California Laboratory Certification Number 1233) on October 18, 1993. Soil samples were analyzed for Total Petroleum Hydrocarbons (TPH) as Diesel by Environmental Protection Agency (EPA) method modified 8015 and benzene, toluene, ethyl benzene and xylene (BTEX) by EPA method modified 8015. The laboratory analytical results are summarized in Table 1 and included along with the chain of custody record as Appendix D. Table 1: Summary of the laboratory analytical results for soil samples collected during the closure of UST 814-D1 U1 on October 15, 1993. 01, 3rnplk3 fdttlfia� li# AnrFytic�lrr : pP } TK-814-D1 U1-RH-01-100 TPH as Diesel ND Benzene ND (100 inches below grade) Toluene ND Ethyl benzene ND Xylene ND SP-814-D1 U1-RH-0I-COM TPH as Diesel 160 Benzene ND (Soil Pile) Toluene ND Ethyl benzene ND Xylene ND NOTE: ND=Not detected above laboratory detection limits. ppm,=parts per million POST-TANK REMOVAL ACTIVITIES UST 814-D1 U1 and the tank system piping, were transported as hazardous waste by LLNL to Erickson Enterprises in Richmond, California on October 15, 1993. A copy of the Uniform Hazardous Waste Manifest is included as Appendix E. The excavation was secured pending laboratory analytical results of the soil samples. UST 814 CLOSURE REPORT -2-