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ARCO Products Company 2
<br /> ARCO Service Station 2133,2908 Benjamin Holt Dr,Stockton CA JuIX 7,1999
<br /> Currently, nine groundwater monitoring wells are sampled quarterly and an additional 11
<br /> wells are sampled semi-annually (Figure 2)
<br /> UST REMOVAL ACTIVITES
<br /> Excavation and removal of one gasoline UST, product lines, vapor lines, and dispensers
<br /> were performed by Henderson Construction of Stockton, California on March 15t" and
<br /> 18"', 1999 The excavated UST consisted of one 10,000-gallon capacity tank of
<br /> fiberglass construction, which was hauled by E C I and disposed of at their facility in
<br /> Richmond, California The tank appeared to have some cracks that appeared to be
<br /> created during the excavation of the tank Excavation and sampling activities were
<br /> observed and approved by Mr Michael Kith of SJCEHD
<br /> Soil Sampling- UST
<br /> On March 18, 1999, two soil samples were collected from the UST excavation Soil
<br /> samples were collected from each end of the tank(designated T-3A@15' and T-
<br /> 3B@15') at a depth of approxtately15 feet below ground surface (bgs) Sail samples
<br /> were analyzed for total petroleum hydrocarbons calculated as gasoline (TPH-g) by EPA
<br /> Method 8015, benzene, toluene, ethylbenzene, xylene, (BTEX compounds) by EPA
<br /> Method 8020, fuel oxygenates DIPE, TAME, EtBE, Ethanol, TBA, and MtBE by EPA
<br /> Method 8260, and lead by EPA Method 6010
<br /> TPH-g and benzene were reported in one of the two soil samples at concentrations of
<br /> 690 mg/kg and 0 692 mg/kg (T-3W-15'), respectively MtBE was reported in both soil
<br /> samples analyzed at a maximum concentration of 0 156 mg/kg (T-3E-15') Fuel
<br /> oxygenates TBA, DIPE, EtBE, TAME, and Ethanol were reported as nondetect
<br /> Additionally, lead was reported as nondetect UST soil analytical data is presented in
<br /> Table 1 and soil sample locations are shown on Figure 3 Field and laboratory
<br /> procedures are presented as Attachment A Certified analytical reports and chain-of-
<br /> custody documentation are presented as Attachment B
<br /> Soil Sampling-Product lines, Vapor lines, and Dispensers
<br /> On March 15a' and 18'x, 1999, a total of thirty-two soil samples were collected from
<br /> beneath the dispensers (designated D-1-3', D-2-2 5', D-3-3', D-4-2 5', D-5-2 5', D-6-
<br /> 3', D-7-2 5', and D-8-3'), product lines (designated PL-1-3', PL-2-3', PL-3-2 5', PL-4-
<br /> 2 5', PL-5-3', PL-6-3', PL-7-3', PL-8-2 5', PL-9-2 5', PL-10-2 5', PL-11-3 5', PL-12-
<br /> 3', PL-13-3', and PL-14-3'), and vapor lines (designated VP, V-1-3', V-2-3', V-3-3', V-
<br /> 4-2 5', V-54', V-6-4', V-74', V-84', and V-94' (Figure 2) Soil samples were
<br /> analyzed for TPH-g by EPA Method 8015, BTEX compounds by EPA Method 8020,
<br /> fuel oxygenates DIPS, TAME, EtBE, TBA, Ethanol, and MtBE by EPA Method 8260,
<br /> and lead by EPA Method 6010
<br /> • TPH-g and benzene were reported in six of thirty-two samples with maximum
<br /> concentrations of 102 mg/kg and 0 298 mg/kg, respectively MtBE was reported in ten
<br /> 76600-019-04/PULL DOC
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