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02 May 1996 AGE Project No. 95-0108 Page 6 of 7 3.8. STOCKPILED SOIL SAMPLING, APRIL 1995 On 14 April 1995, a representative of AGE collected ten soil samples from the soil stockpile on site. Soil samples were collected using a metric soil sample pre-loaded with two clean 2-by 3-inch brass sleeves. Upon collection, the ends of the lead brass sleeve were covered with aluminum sheets, capped and sealed with tape. The samples were placed in a chilled container and transported under chain-of-custody to MAI. The stockpile samples were composited by MAI into five samples for analysis of TPH-d and BTE&X. TPH-d was detected in each sample at concentrations as high as 1,110 ppm. Low concentrations of toluene and xylenes were also detected in the stockpile soil samples. Analytical results are summarized in Table 4. The laboratory report (MAI Lab ID 51728 to 51732) and chain-of-custody are included in Appendix D. 3.9. EXCAVATION OF HYDROCARBON-IMPACTED SOIL, APRIL 1995 . On 25 April 1995, an additional 140 cubic yards of hydrocarbon-impacted soil was excavated from the former UST area,under the supervision of AGE. Four soil samples were collected from the floor and sidewalls of the excavation at depths ranging from 24 to 28 feet bsg. Soil samples were collected using a metric soil sample pre-loaded with two clean 2- by 3-inch brass sleeves. Upon collection, the ends of the leading brass sleeve were covered with aluminum sheets, capped and sealed with tape. The samples were placed in a chilled container and transported under chain-of-custody to MAI and were analyzed for TPH-d and BTE&X in accordance with EPA methods 8015 and 8020. TPH-d and BTE&X were detected in three of the four soil samples at concentration as high as 21,000 ppm (TPH-d, OX4-2). Analytical results of the soil samples are summarized in Table 4. The laboratory results(MAI Lab ID 52051 to 52024)and chain-of-custody form are included in Appendix E. 4.0. CONCLUSIONS AND RECOMMENDATIONS 4.1. FORMER UNDERGROUND STORAGE TANK AREA Although at least four separate excavations of the former UST area have been performed, additional hydrocarbon-impacted soil is still in place on the site. Furthermore, the lateral and vertical extent of impacted soil east of the excavation has not been assessed. We recommend installation of several soil borings or soil probe borings at the site to determine the lateral and vertical extent of hydrocarbon-impacted soil. A sufficient number of soil samples should