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<br /> • 09 February 2005
<br /> AGE-NC Project No 03-1153
<br /> Page 2 of 5
<br /> The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the
<br /> principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground
<br /> Water Basin (Basin 5-22)
<br /> 2 2 UNDERGROUND STORAGE TANK REMOVAL
<br /> On 06 and 07 May 2004, AGE was present at the site during UST and piping excavation activities,
<br /> performed by Thorpe Oil of Stockton,California One 4,000-gallon heating oil UST and associated
<br /> piping were removed Approximately 5 cubic yards of soil were displaced during the excavation and
<br /> stockpiled on-site on plastic sheeting for soil disposal characterization
<br /> Six soil samples were collected for laboratory analysis from the floor of the UST and piping
<br /> excavations and from the soil stockpiles (Figure 2) The samples were transported to Cal Tech
<br /> Analytical Laboratories(CTEL),a State of California Department of Health Services(DHS)-certified
<br /> analytical laboratory, and analyzed for
<br /> Total petroleum hydrocarbons quantified as gasoline,diesel,and heating oil(TPH-g,TPH-d,
<br /> • and TPH-ho, respectively) by EPA Method 8015M, and
<br /> Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and the fuel oxygenates methyl
<br /> tertiary-butyl ether(MTBE), tertiary-butyl alcohol (TBA), di-isopropyl ether(D1PE), ethyl
<br /> tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), 1,2-dichloroethane
<br /> (1,2-DCA), and 1,2-dibromoethane (EDB) by EPA Method 8260B, and lead by EPA
<br /> Method 6010B
<br /> The laboratory analysis detected TPH-ho in the soil samples collected from the excavation stockpile
<br /> (EXE SP) and from the north end of the UST pit (TK1-N) at concentrations of 16,000 mg/kg and
<br /> 14,000 mg/kg,respectively No other analytes were detected at or above laboratory reporting limits
<br /> Figure 2 depicts the approximate locations of the sample collection points, analytical results are
<br /> summarized in Table 1
<br /> On 16 September 2004, soil stockpiled on-site was sampled and transported to CTEL for analysis
<br /> for petroleum hydrocarbons by EPA Method 8260B full scan, as well as heavy metals cadmium,
<br /> chromium, lead, nickel, and zinc by EPA Method 6010B Chromium, lead, nickel, and zinc were
<br /> detected at concentrations of 19 mg/kg, 170 mg/kg, 6 3 mg/kg, and 37 mg/kg, respectively
<br /> Stockpiled soil was subsequently disposed of at Forward Landfill in Manteca,California A copy of
<br /> the non-hazardous waste manifest is provided in Appendix A
<br /> Advanced GeoEnvironmental,Inc
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