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FARR ASSOCIATES 4 3 2 Tank No 3 In January of 1992, WHF drilled MW-1, to the east of the Tank No 3 excavation` MW-1 was drilled to a depth of 75 feet bgs Soil samples were collected at approximate 5-foot intervals and were analyzed for TPH-d, TPH-k, TPH-o, TPH-g, and BTEX The soil samples collected from MW-I at 2, 40 and 55 feet bgs were also analyzed for lead The analytical results of soil samples are presented in Table A-4, Appendix A The only compound detected in the soil samples was toluene in samples from 30 to 55 feet bgs at concentrations ranging from 16 to 130 ug/kg Groundwater samples were collected from MW-1 in June 1992, September 1992 and December 1992 and analyzed for BTEX, TPH-g, TPH-d, TPH-k and TPH-o TPH-o (16 2 mg/l) was detected in the June 1992 sampling None of the compounds analyzed for were detected in the September or December 1992 sampling 4 3 3 Tank No 4 Three borings were drilled near the north and north-eastern extent of the Tank No 4 excavation by ICF Kaiser in October 1994 vertical boring VBO1, slant boring SB01 and monitoring well MW-5 (ICF Kaiser, December 20, 1994) (See Figure 3) Soil samples were collected at approximate 5-foot intervals and analyzed for TPH-g, TPH-d, 'I PH-k, TPH-o, and BTEX Samples from the northernmost boring, VBO1, contained low levels of TPH-o (10-72 mglkg) and TPH-d (2-15 mg/kg) in the upper 20 feet Toluene was detected in samples collected from 10-40 feet at concentrations ranging from 6 to 24 ug/kg The middle boring was a slant boring which contained similar concentrations of toluene and elevated concentrations of TPH-d and TPH-k in the sample collected from 20 feet bgs The final boring, MW-5, was installed near the northeast corner of the excavation and was drilled to a depth of 80 feet bgs A single soil sample from 20 feet bgs was analyzed from this boring, with results similar to the other two borings Analytical results for these borings are included in Table C-3, Appendix C 44 Treatment and Disposal of Removed Soil Approximately 500-600 cubic yards of soil excavated from the vicinity of Tank # 3 and approximately 1,200 cubic yards of soil excavated from the vicinity of Tank # 4 were stockpiled at the Union Ice facility at 1320 West Weber facility for bioremediation Z Upon transfer of the contaminated soil, it was stockpiled and covered with 6 mil poly An aeration permit was ' applied for and issued by the San Joaquin Air Pollution Control Board Treatment of the soil commenced on May 31, 1990 Tillage was maintained on a bi-weekly basis until August 30, 1990 A sprinkler system was installed with an automatic timer to maintain moisture for dust 'Originally, WHF attempted to install a monitoring well immediately to the south of former Tank 43 (B-2) However, WHF was reportedly unable to install a monitoring well in the backfill area zThe soils were transported to the Union Ice facility on Weber Street because the Union Street facility had been sold to Arctic Ice and there was no room for treatment at the 425 Union Street address C\MyFifes\Annelwpwinlprojectslunion\ClosureRpt wpd 7