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unpaved truck parking area at 6 to 12 inches bgs (Appendix A) Total lead in surface soils 0 to 4 feet bgs was reported from 6 7 to 200 mg/kg (Appendix A) The results of this investigation suggested that either the 10,000 gallon UST and/or product line ' had leaked The diesel and waste oil underground storage tanks were tested in July 1985 by Integrity Tank Testing Systems, Inc of Stockton, California, and no leaks were reported However, BNI ' completed a second investigation in February 1986, which included three soil borings adjacent to the 10,000 gallon UST to a depth of 27 feet bgs, and soil analyses for TPH Analyses for TPH reported concentrations as high as 5,100 mg/kg TPH, at 20 to 22 feet bgs (Appendix A) Subsequently, all three ttanks to the vicinity of the maintenance shop, were emptied and taken out of service in early 1986 ' 2 2 SOIL AND GROUNDWATER INVESTIGATION 1 J H Kleinfelder and Associates (JHKA) completed a soil and groundwater investigation to the vicinity of the maintenance shop for American Moulding and Millwork on November 4, 1987 The purpose of the investigation was to further characterize the extent and type of petroleum hydrocarbons ' identified to the soils by BNI, and evaluate any potential adverse impact on groundwater resulting from the presence of the petroleum hydrocarbons in the vicinity of the maintenance shop A discussion of remedial options for mitigating the diesel fuel present in the unsaturated zone was also included to this �i report (JHKA, 1987) ' Between June and September 1987, Kleinfelder drilled a total of 33 soil borings in the vicinity of the maintenance shop (Figure 2 1) Seventy five soil samples collected from the borings at depths ' ranging from 5 to 30 feet were selected for chemical analysis All soil samples were analyzed for diesel in soils (TPH/D) by EPA Method 8015, and two samples were analyzed for volatile and semivolatile compounds by EPA Methods 8240 and 8270 Results of these analyses reported TPH/D in soils ranging ' from 33 ppm to 4,400 ppm The highest TPH/D concentrations were found in the vicinity of the south eastern comer of the maintenance building at depths of approximately 20 to 25 feet Of the two samples analyzed for volatiles and semivolatiies, both exhibited elevated semivolatile concentrations In June 1987, Kleinfelder installed three groundwater monitoring wells in the vicinity of the maintenance shop Based on a west-northwesterly groundwater flow direction, monitoring wells were located hydraulically downgradient from the diesel sources Groundwater samples were collected by ' Kleinfelder in July of 1987 and analyzed for volatile organics (EPA Method 602), phenols (EPA Method 604), polynuclear aromatic hydrocarbons (EPA Method 610) and TPH/D (EPA Method 8015) None of the above listed constituents were detected in the groundwater samples (Appendix B) 1 i SAC36 046 4