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Protect No 014-95262 Page No 5 diesel fuel supply pipeline, and in areas used previously to stockpile and dispose of spoils from the underground tank excavation Please refer to Figure 4 for locations of all sampling activities l Prior to the commencement of the investigation at the project site, all necessary permits were obtained from the San Joaquin Environmental Health Division (SJCEHD) For detailed methodologies 1 used during the course of this investigation and permit copies, please refer to Appendix D i 7.0 FINDINGS OF THE INVESTIGATION 7.1 Hand Auger Borings Three areas were outlined for further shallow soil investigation during Krazan's Phase I site inspection of the Safeway facility Those areas were 1) the inactive boiler fuel (diesel) supply lines, 2) the areas used to stockpile and eventually dispose of spoils from the UST excavation, and 3) a below grade vault located near the brine tank The analytical results for samples collected from these areas are f presented in Table 1 (following text) 7.1.1 Excavation Stockpiles Three areas were investigated due to their use for either stockpiling or disposal of the spoils generated during overexcavation of the former diesel tanks Sample locations from these areas are designated KHA-7 through KHA-12 on Figure 4 Samples KHA-7 and KHA-8 investigated the potential for leaching of petroleum constituents into native soil because these areas were used to stockpile petroleum affected spoils The presence of total petroleum hydrocarbons as diesel (TPH-D), total petroleum hydrocarbons as gasoline (TPH-G), benzene, toluene, ethylbenzene, xylenes (BTEX) was not detected in these two samples, collected at a depth of 6-12 inches below ground surface (bgs) Four samples (KHA-9 through KHA-12) were collected from dust above the native soil/spoils interface (1 5 to 2 0 bgs) to determine if adequate remediation of excavation spoils had occurred prior to their placement on the undeveloped portion of the Safeway lot, north of the main building (see Figure 4) No BTEX was detected in these samples One sample contained 2 6 mg/kg TPH-G and three samples contained TPH-D at low concentrations— 1 3 mg/kg, 1 1 mg/kg, and 32 mg/kg for samples KHA-9, KHA- 10, and KHA-11, respectively 7.1.2 Former Diesel Supply Lines Prior to the establishment of a dependable supply of natural gas to fire the main facility boiler, I� diesel was used as a fuel Two product lines, a supply and a return line, connected the boiler room and the KRAZAN & ASSOCIATES, INC L faces Serving the Western United States 95262 FS2