ARCHIVED REPORTS_XR0009361 - Laserfiche WebLink

Home Browse Search

configuration as found immediately prior to building expansion activities initiated in September • 2002 Copies of the photographs are included in Appendix D ' 9.3 Environmental History and Source Characterization ' In February 2002, during grading activities in preparation for planned building expansion activities, a 500-gallon heating oil UST was encountered on the southeastern portion of the site The date of installation of the UST is unknown, however it is believed the UST was used to supply fuel for the heating system of a former residential structure on the site The UST was subsequently removed Petroleum hydrocarbon analytes were not detected in a soil sample 1 collected from the base of the UST excavation (IT, 2002a) Soil sample analytical data is included in Table 1 and depicted in Figure 3 In March 2002, a 2,000-gallon diesel UST was removed (Photograph 7) The tank had contained fuel for an emergency backup power generator, the UST was replaced with an 8,000-gallon UST located further to the east (IT, 2002b) During removal activities, groundwater was encountered at a depth of approximately 12 feet bsg A soil sample collected from a depth of 12 feet at the north end of the excavation contained 13 parts per million (ppm) of total petroleum '. hydrocarbons as diesel (TPH-D), and a sample collected from the south end of the pipeline trench contained TPH-D at 5 0 ppm A groundwater sample collected from the excavation contained 130 parts per billion (ppb) of TPH-D (IT, 2002b) Soil sample analytical data is ' included in Table 2 and depicted in Figure 3 Groundwater sample analytical data is included in Table 3 and depicted in Figure 4 In September 2002, a total of six direct-push soil borings were performed adjacent to the former ' 2,000-gallon UST location at the request of the SJCEHD (IT, 2002c) Results of the analysis of the soil samples detected TPH-D in one of the borings at a concentration of 2 7 ppm No ' benzene, toluene, ethylbenzene, and xylenes (BTEX) constituents or MTBE were detected in any of the soil samples Soil sample analytical results are included in Table 4 and depicted in ' Figure 5 ' Groundwater was encountered during boring activities at depths ranging from 11 feet to 14 feet bsg Analysis of groundwater samples collected from three of the borings detected TPH-D at concentrations ranging from 50 ppb to 390 ppb No BTEX constituents or MTBE were detected 1 CNCD\04-28-031SiiARE\UST103-0027 doe 3