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23 October 1997 AGE-NC Project No. 97-0348 Page 2 of 4 the excavated soil was used to backfill the trenches. One composite soil sample was collected by a representative of Alpha Analytical Laboratories Inc. (ALL)from the excavated stockpile soil. The sample was collected using a metric soil sampler loaded with two clean, 2-by 3-inch brass sleeves. Upon collection, the ends of the lead sleeve were covered with Teflon sheets, capped and sealed with tape. The soil sample was logged on a chain-of-custody form, placed in a chilled container and transported to AAL for analysis of total petroleum hydrocarbons quantified as oil(TPH-O) and Oil and Grease in accordance with EPA methods 8015M and 418.1, respectively. The laboratory report (ALL Batch No. 97-0915-005) and chain-of-custody forms are presented in Appendix A. Analytical results are summarized in Table 1 -Analytical Results of Soil Samples. 2.2. ADDITIONAL TRENCHING ACTIVITIES In a telephone conversation with Ms. Letitia Briggs, the PHS-EHD recommended the excavation of additional trenches and collection of soil samples. AGE did not concur with the recommendations; however, the City of Stockton Public Works Department complied and on 01 October 1997, two additional trenches (T-4 and T-5) were excavated. Furthermore, soil from the UST excavation was removed and a soil sample collected from the floor of the excavation. The locations of trenches T-4 and T-5 are illustrated on Figure 2. No additional USTs were located during the additional excavation activities. The soil sample(Tl-9)collected from the area of the removed UST was collected at a depth of 9 feet bsg by a representative of Precision Enviro-Tech (PET). The sample was collected in a brass sleeve; the ends of the sleeve were covered with Teflon sheets, capped and sealed with tape. The sample was logged on a chain-of-custody form, placed in a chilled container and transported to PET for analysis of total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d), volatile aromatics (benzene, toluene, ethylbenzene and xylenes: BTEX) with methyl tertiary butyl ether (MTBE) and total lead with EPA methods 8015M, 8020 and 6020. The laboratory report (PET Lab Sample I.D. PEI 324-01) and chain-of-custody forms are presented in Appendix B. The analytical results are summarized in Table 1 -Analytical Results of Soil Samples. 2.3. BACKFILL AND COMPACTION On 02 October 1997, the former UST area and trenches T-1 through T-5 were re-excavated to a depth of 7 feet bsg. The excavation cavity was backfilled utilizing the stockpiled soil at the site and compacted in 12 inch lifts with a compactor to 7 inches bsg. Advanced GeoEnvironmenfal,Inc,