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Well Abandonment and Soil and Groundwater Investigation Work Plan
<br /> US Can-Welty Road September 2007
<br /> Kinder Morgan Energy Partners, L.P.currently operates a pipeline that reportedly transports gasoline,jet
<br /> fuel,and diesel located between the site and Highway 33.
<br /> 2.3 EXISTING AND PLANNED DEVELOPMENT
<br /> The site buildings currently appear to be used primarily for manufacturing. The adjoining properties are
<br /> mixed industrial and agricultural use. Future site plans are unknown.
<br /> 2.4 REGIONAL HYDROGEOLOGY(DWR,2003)
<br /> Regionally, the site is encompassed within the Tracy sub-basin(Groundwater Basin Number 5-22.15)and
<br /> is defined by unconsolidated to semi-consolidated sedimentary deposits that are bounded by the Diablo
<br /> Range on the west,the Mokelumne and San Joaquin rivers on the north,the San Joaquin River on the
<br /> east,and the San Joaquin-Stanislaus County line on the south. The Tracy sub-basin is located adjacent to
<br /> the eastern San Joaquin sub-basin on the east and the Delta-Mendota sub-basin on the south. These sub-
<br /> basins are located within the larger San Joaquin Valley Groundwater Basin.
<br /> The Tracy sub-basin is comprised of continental deposits of Late Tertiary to Quaternary age, including
<br /> the Tulare Formation, Older Alluvium,Flood Basin Deposits,and Younger Alluvium. The thickness of
<br /> these formations ranges from a few hundred feet in the western foothills to about 3,000 feet near the
<br /> eastern margin of the basin. The Tulare Formation is comprised of semi-consolidated,poorly sorted,
<br /> discontinuous deposits of clay, silt, and gravel. The Corcoran clay is situated near the top of the Tulare
<br /> Formation,separating groundwater in the basin in what has been reported as two primary aquifers. The
<br /> upper aquifer is reported to range in thickness from 15 to 250 feet below ground surface(bgs), and the
<br /> lower aquifer is reported at 600 feet bgs.
<br /> 2.5 PREVIOUS ENVIRONMENTAL ACTIVITIES
<br /> Site Investigations(Environmental Resources Management-West,Inc. [ERM-West], 1995a, 1995b).
<br /> On March 30,2995, ERM-West collected 11 surface soil samples(S-1 through S-11)near the wash water
<br /> discharge area, gasoline storage tank removal area,chemical storage shed, condensate line outlet, septic
<br /> tank,compressor building,outdoor equipment storage area(i.e., west of the can fabrication plant
<br /> waste/bum pit area). TPH quantified as oil and grease(TPHog)was detected in four soil samples(S-4, S-
<br /> 5, S-6, and S-8)at concentrations ranging from 1,500 milligrams per kilogram(mg/kg)to 5,200 mg/kg.
<br /> TPH quantified as gasoline(TPHg)was detected in two of the soil samples(S4 and S-5)at
<br /> concentrations of 20 and 6,000 mg/kg.
<br /> On May 9, 1995,ERM-West advanced four hand borings(HB-3,HB-4,HB-5, and HB-6)to 10 feet bgs
<br /> in order to establish the lateral and vertical extent of affected soil near the northeastern side of the former
<br /> can fabrication plant. Affected soil was identified in borings HB-3,HB-4,and HB-6. BTEX and TCE
<br /> were the main compounds detected in the soil samples.
<br /> Site Investigations(WHF, 1996a, 1996b; Geological Technics,Inc, 1996). On November 29, 1995,
<br /> WHF, Inc. in conjunction with its contractor SEMCO of Modesto excavated an exploratory trench to a
<br /> depth of 19 feet bgs in the area on the north side of the former container fabrication plant and collected
<br /> one soil sample at 14 feet bgs. TPH quantified as diesel(TPHd),TPH quantified as motor oil(TPHmo),
<br /> BTEX, and TCE were detected in this sample. TPHd and TPHmo were detected at concentrations of
<br /> 8,600 and 3,400 mg/kg,respectively.
<br /> Subsequently,under the supervision of WHF, Inc., SEMCO removed approximately 29.86 tons of soil
<br /> from the waste/bum pit and disposed of the soil in an approved Class I hazardous waste facility in
<br /> Kettleman City, California. The burn pit had been primarily used for the disposal of unconsolidated,
<br /> incinerated debris and garbage. WHF recommended that the extent of soil and any groundwater affected
<br /> by releases from the waste/bum pit be investigated.
<br /> On March 6, 1996, WHF,Inc. advanced six hand borings (RB-1 through RB-6)to 2.5 feet bgs in the
<br /> vicinity of the waste/bum pit area and collected and tested samples to investigate soil impacts. According
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