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September 14, 1998
<br /> Page 4
<br /> Teported the maximum concentration of O & G at 25,000 mg/kg The maximum VOC
<br /> (tetrachloroethene at 160 ppb) was detected in WO-2 Benzene and lead were not detected
<br /> in either WO-1 or WO-2
<br /> On January 8, 1998, over-excavation and sampling activities at waste oil tank 1 were
<br /> observed and approved by Ms Lagono The waste oil tank 1 pit was over-excavated due
<br /> to high levels of petroleum hydrocarbons confirmed by laboratory analyses in shallow soil
<br /> Over-excavation and sampling activities were conducted from approximately 11 to 17-1/2
<br /> feet bgs A map illustrating approximate lateral limits of the over-excavation is presented
<br /> as Figure 5 The maximum concentration of TPH-g was reported from sample WO-1 at
<br /> 170 mg/kg at I 1 feet bgs Unidentified hydrocarbons quantified as TPH-d were reported
<br /> from all samples with the maximum concentration reported from sample WO-i at 5,300
<br /> mg/kg The maximum concentration of O & G was 9,400 mg/kg reported from WO-W at
<br /> I 1-1/2 feet bgs VOCs results reported the maximum concentrations of acetone,
<br /> tetrachloroethene, and cis-1,2-Dichloroethene at 900, 1,500 and 2,200 ppb, respectively,
<br /> from WO-C at 17-1/2 feet bgs A single SVOC, 1,2-Dichlorobenzene was detected at ,
<br /> 2,200 ppb from WO-N at 12 feet bgs CAM 5 metals results reported the maximum
<br /> concentrations of chromium, nickel, and zinc at 34, 31, and 44 mg/kg respectively, from
<br /> WO-C at 17-1/2 feet bgs Benzene, MtBE, PCBs, and lead were not detected in any of the
<br /> over-excavation samples VOCs, SVOCs, PCBs, and CAM 5 metals results are presented
<br /> in Attachment B
<br /> On January 19, 1998, Wendt discovered an additional steel waste oil tank, hereafter
<br /> referred to as "waste oil tank 2" of approximately 600-gallon capacity located south of the
<br /> northeastern canopy support On January 20, 1998 Wendt discovered a groundwater well
<br /> north of waste oil tank 2 The history of this well is unknown The steel-cased
<br /> groundwater well measures 4 inches in diameter and 40 feet total depth
<br /> The waste oil tank 2 excavation, removal, and sampling activities were conducted on
<br /> January 29, 1998 and were observed and approved by Mr Infurna The 600-gallon waste
<br /> oil tank had a hole approximately 118-inch'in diameter on the east endnear the bottom
<br /> Sample WO-2 was collected at 8-1/2 feet bgs beneath waste oil tank 2 (Figure 4) and was
<br /> analyzed for TPH-g, TPH-d, BTEX compounds, MtBE, VOCs, SVOCs, CAM 5 metals,
<br /> O & G, and PCBs Analytical results reported nondetectable levels for all constituents
<br /> analyzed except CAM 5 metals Chromium, nickel, and zinc were reported at 40, 28, and
<br /> 47 mg/kg respectively Hoist and waste oil tank soil analytical results are summarized in
<br /> Table 2
<br /> Stockpile Sampling
<br /> All stockpiled soil was sampled for waste disposal characterization Approximately 48
<br /> cubic yards of soil were removed from the waste oil tank excavations Approximately 419
<br /> cubic yards of soil were removed from the product line and dispenser excavations All
<br />• soils excavated were transported by Manley and Sons Trucking to BFI's Vasco Road
<br /> Landfill in Livermore, California Stockpiled soil analytical data is summarized in Table 3
<br /> 920-119 1AnXPULRPT DOC
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