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04 December 1998 AGE NC Project No. 98-0497 Page 2 of 4 in Appendix B. Following decontamination activities,a total of 500 poxmds of dry ice were purchased from Arctic Ice in Stockton and placed inside each UST to purge bolh volatile vapors and oxygen from the tank. Documentation for the dry ice purchase is included wilh Appendix'C. Following an inspection by representatives of the PHS- HD and the Montezuma Fire Department, the USTs were approved for removal and hoisted out of he tank cavity utilizing a conventional truck mounted crane. The tanks were hauled off-site as a non-hazardous material to West Coast Equipment, a tank recycling facility in Turlock, Caiifo 'a. Documentation of receipt of the USTs issued by West Coast Equipment is included with Appendix D. Photographs of each UST during tank removal activities are included with Appendix E. 2.2. SOIL SAMPLE COLLECTION Following tank removal activities, soil samples were collected from beneath the north end, middle and south end of the former UST locations by a representative of AAL and under the direction of the PHS-EHD. Samples were collected from depths of approximately 14 feet bsg. Analytical results of soil samples are summarized in Table 1. At the direction of the PHS-EHD,a total of six soil sam les were collected by AAL from stockpiled soil located approximately 100-feet south of the tank cavity for analysis. Slight to moderate petroleum hydrocarbon odors were noted in all six soil. samples during sample collection. Upon collection, each sample was logged on a chai of-custody form, transported to AAL in a chilled container and analyzed for the following": • Total petroleum hydrocarbons quantified as dies 1(TPH-d)in accordance with EPA Methods 8015M/5030; and • Volatile aromatics(benzene,toluene, ethylbenzene and xylenes: BTEX) in accordance with EPA Method 8020; The laboratory report(AAL Batch No. 98-0930-019 ) arid chains-of-custody forms are presented in Appendix F. Advanced GeoEmAronmental,Inc.