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TABLE 2 GROUNDWATER MONITORING DATA,FORMER MOBIL STATION 99CAS,75 EAST ALPINE AVENUE,STOCKTON,CALIFORNIA
<br /> Concentration(µg2)
<br /> Casing Depth to Groundwater LPH
<br /> Ethyl- Total Oil and
<br /> Well Elevation Water Elevation Thickness
<br /> Number Date feet feet (feet (fee[ ' Xylenes'Benzene' Tolueneb benzene' TPH- TPH-d Grease MTBE' PCBs° SVOCs
<br /> EXI 08/09/10 1 16.51 37.33 -20.82 0.00 25,000 65,000 3,100 19,000 130,000 m 700 m -- <I,000 -- --
<br /> EX2 10/05/10 1 16.51 38.12 -21.61 0.00 26,000 66,000 3,600 20,000 240,000 1,400 m -- <1,000 -- --
<br /> EXI 02/09/11 16.51 36.70 -20.19 0.00 19,000 56,000 3,000 17,000 130,000 m 910 m,n - <I,000 - -
<br /> EX2 07/14/09 16.83 41.20 -24.37 0.00 47,000 69,000 3,400 19,000 170,000 740 -- <1,200 -- --
<br /> EX2 10/27/09 16.83 41.53 -24.70 0.00 22,000 29,000 1,300 7,500 70,000 2,700 In -- <1,200 -- --
<br /> EX2 01/25/10 16.83 39.69 -22.86 0.00 35,000 44,000 1,400 9,500 120,000 in 710 in -- <1,000 - --
<br /> EX2 04/07/10 16.83 37.81 -20.98 0.00 50,000 73,000 3,800 24,000 170,000 820 in -- <500 -- --
<br /> EX2 08/09/10 1 16.83 37.70 -20.87 0.00 45,000 71,000 2,900 20,000 150,000 m 890 m -- <1,000 -- --
<br /> EX2 10/05/10 1 16.83 38.45 -21.62 0.00 46,000 67,000 3,300 20,000 280,000 1,500 in -- <1,000 - -- •
<br /> EX2 02/09/11 16.83 37.08 -20.25 0.00 43,000 73,000 3,600 217000 150,000 m 670 m,n - <1,000 - --
<br /> Notes:
<br /> a PCB analysis as Aroclors by EPA Method 8082 includes PCB types 1016,1221, 1232,1242,1248,1254,and 1260.
<br /> b Samples analyzed by EPA Method 8260B except First Quarter 2009 when benzene,toluene,ethylbenzene,and total xylenes were analyzed by EPA Method 8021B.
<br /> c S V OC reporting limits are<4.7,<9.4,<19,<47,or<94,depending on the analyte.
<br /> d Does not match typical pattern.
<br /> e Secondary ion abundances were outside method requirements.Identification based on analytical judgment.
<br /> I Reporting limit raised due to sample matrix effects.
<br /> g Hydrocarbon result partly due to individual peak(s)in quantitation range.
<br /> h Reporting limit raised due to high concentrations of non-target analytes.
<br /> i Analyte presence was not confirmed by second column or GC/MS analysis.
<br /> j Analyte was detected at a concentration at or below the reporting limit and above the laboratory method detection limit.Reported value is estimated.
<br /> k Samples analyzed by EPA Method 8021B(M).
<br /> I Groundwater samples for laboratory analysis collected 1 day after(measurement of depth to)groundwater gauging event.'
<br /> in The sample chromatographic pattern for TPH does not match the chromatographic pattern of the specified standard. Quantitation of the unknown hydrocarbon(s)in the sample was based upon
<br /> the specified standard. •
<br /> n The sample extract was subjected to silica gel treatment prior to analysis.
<br /> LPH Liquid-phase hydrocarbons.
<br /> MTBE Methyl tertiary butyl ether.
<br /> ND Not detected.
<br /> PCBs Polychlorinated biphenyls(as Aroclors).
<br /> SVOC Semivolatile organic compounds.
<br /> TPH-d Total Petroleum Hydrocarbons as diesel.
<br /> TPH-g Total Petroleum Hydrocarbons as gasoline.
<br /> -- Not measured,not sampled,or not analyzed.
<br /> µg/L Micrograms per liter.
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