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ARCO Products Company 2
<br /> ARCO Service station#0434 501 West K ttleman Lane,CA September 16,1999
<br /> UST REMOVAL ACTIVITIES
<br /> Excavation and removal of three USTs, and associated product lines and dispensers were
<br /> performed by Henderson Construction of Stockton, California on June 16, 1999. The
<br /> excavated USTs consisted of two 12,000-gallon capacity (gasoline) and one 6,000-gallon
<br /> capacity (gasoline)USTs. Tanks T-1 and T-3 appeared to be in good condition, with no
<br /> apparent holes or cracks noted during removal. Tank T-2 had some holes around the
<br /> pull-rings caused by the excavator during the removal of the tank. Excavation and
<br /> sampling activities were observed and approved by Vidal Pedraza from the San Joaquin
<br /> County Environmental Health Services. Groundwater was not encountered within the
<br /> UST excavation. Historically groundwater at the site has been measured between 48 feet
<br /> below ground surface (bgs) to 69 feet bgs.
<br /> Soil Sampling—USTs
<br /> On June 16, 1999, seven soil samples (designated, T-1N@13', T-1C@14', T-1S@14',
<br /> T-2N@14', T-2C@14', T-2S@14', and T-3S@13.5') were collected at depths ranging
<br /> from of 13-t/2 feet bgs to 14 feet bgs beneath the former USTs (Figure 2). All soil
<br /> samples were analyzed for total petroleum hydrocarbons calculated as gasoline (TPH-g),
<br /> benzene, toluene, ethylbenzene, xylene, (BTEX compounds), methyl tert-butyl ether
<br /> (MtBE)by EPA Method 8015/8020, fuel oxygenates (MtBE, EtBE, DIPE, TAME,
<br /> TBA, and 1,2-DCA)by EPA Method 8260, and total lead.
<br /> TPH-g was reported in one of the seven samples collected (T-3S@13.5') at a
<br /> concentration of 5.15 mg/kg. Benzene was reported as nondetect in all samples collected
<br /> from beneath the fuel USTs. MtBE was reported in five of the seven samples collected
<br /> from the fuel UST excavation at a maximum concentration of 2.17 mg/kg by EPA Method
<br /> 8260 (T-2@14'). UST soil analytical data are presented in Table 1 and soil sample
<br /> locations are shown on Figure 2. Field and laboratory procedures are presented as
<br /> Attachment A. Certified analytical reports and chain-of-custody documentation are
<br /> presented as Attachment B.
<br /> Soil Sampling— Product Lines and Dispensers
<br /> Between June 18 and July 8, 1999, nineteen soil samples (designated PL-1 through PL-10
<br /> and D-1 through D-8 and one duplicate sample D-5)were collected at depths ranging
<br /> from approximately 3 to 6 feet bgs in the area of the product lines and dispensers.
<br /> Sample locations are shown on Figure 2. All product line and dispenser samples were
<br /> analyzed for total petroleum hydrocarbons calculated as gasoline (TPH-g), benzene,
<br /> toluene, ethylbenzene, xylenes, (BTEX compounds), methyl tert-butyl ether(MtBE)by
<br /> EPA Method 8015/8020, fuel oxygenates (MtBE, EtBE, DIPE, TAME, TBA, and 1,2-
<br /> DCA) by EPA Method 8260, and total lead.
<br /> TPH-g was reported in two samples collected from beneath the product fines and
<br /> dispensers at a maximum concentration of 10.3 mg/kg (PL1@5.5'). Benzene was reported
<br /> 077.41741.500/PULL.DOC
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