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Chevron Products Company 2
<br />Former Chevron Service Station #9-5775, 301 West Kettletnan Lane, Lodi, California June 5, 2001
<br />Locations of previously existing facilities and sampling locations are shown on Figure 2 A Prime
<br />• Shine Express car wash and auto lubricant center is currently operated at the site
<br />•
<br />2.1 Previous Investigations
<br />Gettler-Rvan, Soil Sampling During Underground Storage Tank and Pipit Removal
<br />November 10,1998A. On August 24, 1998, the five former USTs, hydraulic hoists, dispenser
<br />islands, and associated product piping were removed by Musco Excavators Soil samples were
<br />collected by Gettler-Ryan (G -R) beneath the USTs and product piping Low to nondetectable
<br />concentrations of petroleum hydrocarbons were reported in soil samples collected below the waste -
<br />oil UST, product Imes, and hydraulic hoist Soil samples collected beneath the eastern end of the
<br />middle gasoline UST (14-112 feet below ground surface [bgs]) contained concentrations of total
<br />petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, and methyl tertiary butyl ether
<br />(MtBE) up tol4,000 milligrams per kilogram (mg/kg), 84 mg/kg, 1,500 mg/kg and 56 mg/kg,
<br />respectively The area beneath the eastern end of the middle gasoline UST was excavated from 14-
<br />1/2 to 16 feet bgs, and a second soil sample was collected Concentrations of TPHg, toluene, and
<br />MtBE in this sample were reported at 880 mg/kg, 52 mg/kg, and 11 mg/kg, respectively Benzene
<br />was not detected in this sample Historical soil analytical data is included in Attachment C, and
<br />soil sample locations are shown on Figure 2
<br />On August 31, 1998, the area beneath the eastern end of the middle gasoline UST was over -
<br />excavated from 16 to 22-1/2 feet bgs Soil samples collected from the base and the eastern wall of
<br />the excavation were reported to contain concentrations of TPHg, benzene, and MtBE at 2,300
<br />mg/kg, 4 1 mg/kg, and 330 mg/kg, respectively
<br />G Monitoring Well Installation Re ort June 2 1999. Between January 25 and January 27,
<br />1999, five soil borings were drilled by V&W Drilling, with four of the borings completed as
<br />monitoring wells The four monitoring wells (MW -1 through MW -4, Figure 3) were completed to
<br />65 feet bgs Soil samples collected from the borings had reported concentrations of TPHg,
<br />benzene, MtBE, and ethyl tertiary butyl ether (EtBE) up to 1,200 mg/kg, 0.81 mg/kg, 78 mg/kg,
<br />and 13 mg/kg, respectively Groundwater samples collected from the monitoring wells had
<br />reported concentrations of TPHg, benzene, MtBE, EtBE, and tertiary amyl methyl ether (TAME)
<br />up to 11,000 micrograms per liter (ug/1), 6,800 ug/1, 62,000 ug/l, 2,400 ug/l, and 780 ug/l,
<br />respectively Historical groundwater analytical data is included in Attachment D
<br />GR, Off-site Source Survey (November 2. 1999). In October of 1999, G -R continuously
<br />monitored the groundwater elevations at the site over a three-day period The results of the study
<br />indicated that groundwater elevations fluctuate in daily cycles corresponding to the operation of
<br />nearby City of Lodi Municipal Well 12 (Well 12), located approximately 350 feet southwest of the
<br />site
<br />GR, Monitoring Well Installation Report (March 30,1000 Between December of 1999 and
<br />February of 2000, five additional monitoring wells (MW -5A, MW -6, MW -7, MW -8A, and MW -9
<br />I IChevron195775TarFrpl9-5775PARFRP2 doc
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