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Quarter Monitoring Report
<br />' January through March 2005
<br /> . 8200 N Highway 99, Stockton,CA
<br /> Page 4 of 8
<br /> Argon Laboratories analyzed all groundwater samples for total petroleum hydrocarbons as
<br /> gasoline (TPHg) using EPA 801513, benzene, toluene, ethylbenzene, and total xylenes (BTEX)
<br /> tusing EPA 802113, and oxygenated gasoline additives, ethylene dibromide (EDB), 1,2-
<br /> dichloroethane (1,2-DCA) using EPA 8260B
<br />' No gasoline constituents, including MTBE, were detected in the groundwater samples collected
<br /> from shallow aquifer wells MW7, MW8, MW 10, MW 11, MW 15 or MW 16 in March 2005 In
<br /> addition, no gasoline constituents or MTBE were detected in B Zone wells MW9B or MW 14B
<br /> 1
<br /> TPHg and BTEX constituents were detected only in groundwater samples collected from wells
<br /> EW 1 and V W 1 in March 2005 The sample collected from well EW 1 contained TPHg at 44,000
<br /> parts per billion (ppb), benzene at 5,400 ppb, toluene at 10,000 ppb, ethylbenzene at 860 ppb, and
<br /> xylenes at 6,300 ppb Well VW1 contained TPHg at 20,000 ppb, benzene at 2,600 ppb, toluene at
<br />' 2,000 ppb, ethylbenzene at 800 ppb, and xylenes at 3,000 ppb
<br /> MTBE was present in wells EW1, EW2, MW3, MW4, MW5, MW6, MW12, MW13C, and VW1
<br /> at concentrations of 11,000 ppb, 82 ppb, 1,300 ppb, 5,200 ppb, 20 ppb, 410 ppb, 140 ppb, 56 ppb,
<br /> and 29,000 ppb, respectively No MTBE was detected in samples collected from wells MW7,
<br /> MW8,MW9B, MW10, MW11, MW1413,MW15, or MW16
<br /> • Table 5 summarizes groundwater analytical results Figures 4, 5 and 6 present isoconcentration
<br /> maps of TPHg, benzene, and MTBE in the A Zone, respectively, from March 2005 Attachment D
<br /> 1 contains laboratory reports and chain-of-custody documentation for groundwater samples
<br /> collected from site wells in March 2005 Attachment E contains graphs of TPHg, benzene, and
<br /> MTBE concentrations over time in all site wells
<br />' 3.3 Domestic Well Sampling and Analysis
<br />' As directed by EHD in a letter dated October 10, 2003, Ground Zero collected water samples from
<br /> eight nearby domestic wells, including the site facility well The samples were collected from
<br /> either a sample port at the wellhead or from the nearest available sampling location (i e garden
<br /> ' hose) Samples were collected after the pump was turned on for approximately 15 minutes The
<br /> samples were immediately stored in an ice chest refrigerated to a temperature of approximately 4°C
<br /> and delivered under chain of custody protocol to FGL Laboratories (ELAP #1563) and analyzed for
<br /> volatile organic constituents utilizing EPA Method 524 2
<br /> No VOCs were detected in any of the samples collected from the nearby domestic wells Copies of
<br /> the laboratory reports were submitted to the respective property owner The laboratory reports for
<br /> samples collected from the nearby domestic wells are included in Attachment F Figure 7 shows
<br /> the locations of the domestic wells relative to the site
<br /> G 1GROUNUZEITULEBURGNReports\QMR1200511QM2005 doc
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