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March 24, 1997 • Page S • The location of the waste oil tank sample collected from the excavation is shown on Figure 2 This sample was collected from beneath the fill port at the east end of the former waste oil tank Additionally,a sample was collected from beneath the oil sump drain line adjacent to the waste oil tank excavation No hydrocarbons were reported in either sample The sample locations are shown on Figure 2 Sample data including sample designation, sample depth and sample results are presented in Table 2 Former Product Line Sampling Exploratory excavation was performed and two soil samples (PL-1 and PL-2)were collected in the area of the former product lines No hydrocarbons were reported in either sample The sample locations are shown on Figure 1 Sample data including sample designation, sample depth and sample results are presented in Table 3 Stockpiled Soil Removal Soils generated during the excavation activities described above were stockpiled onsite for characterization and disposal Soil from the former gasoline UST pit was stockpiled separately from the soil generated during the excavation of the waste oil UST Very low to nondetect concentrations were reported in the soil removed from the waste oil tank excavation SJCEHD approved of the use of this soil as backfill in the waste oil excavation Material removed and stockpiled during the excavation of the former gasoline UST pit consisted of approximately 380 cubic yards of impacted soil and approximately 200 yards of concrete debris Care was taken to segregate concrete from the soil Concrete debris was hauled offsite to a concrete recycler Soil samples were collected from the stockpiled soil in accordance with the procedures described in Attachment A Four samples were collected approximately every 200 cubic yards or less of stockpiled soil In the lab, the four samples were composited into one sample and then analyzed Sample designations and the results of laboratory analysis of these samples are summarized in Table 4 The stockpiled soil was loaded by-Iendersoo and hauled by - waste Trucking to BFI- Vasco Road Landfill, a Class 1I disposal facility, on October 23 and 24, 1995 Subsurface Conditions Soils encountered during excavation consisted primarily of fine sandy silts Groundwater was not encountered in the excavations Excavation Backfill Upon completion of excavation activities, the waste oil excavation was backfilled with . the original waste oil tank excavation backfill material and imported backfill material The gasoline UST pit excavation was backfilled with imported backfill material 9200391A/W1PU1 l DOC