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Mr Jeff Wong
<br /> •I Page 4 of 5
<br /> field purge logs are included in Attachment D
<br />'
<br /> Argon Laboratories analyzed all groundwater samples collected for total petroleum hydrocarbons as
<br /> gasoline (TPHg) using EPA 8015B, benzene, toluene, ethylbenzene, and total xylenes (BTEX) using EPA
<br />' 8021B, and oxygenated gasoline additives, ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA)
<br /> using EPA 8260E
<br />' No gasoline constituents were detected in the groundwater samples collected from wells MW6, MW7,
<br /> MW8, MW9B, MW 10, MW 11, or MW 14B in December 2003
<br />' TPHg and BTEX constituents were detected only in wells MW1 and MW2 in December 2003 Well
<br /> MW1 contained TPHg at 14,000 ppb, benzene at 2,300 ppb, toluene at 1,300 ppb, ethylbenzene at 65 ppb,
<br /> and xylenes at 460 ppb Well MW2 contained TPHg at 1,300 ppb, benzene at 13 ppb, toluene at 1 2 ppb,
<br />' ethylbenzene at 9 4 ppb,and xylenes at 6 6 ppb
<br /> MTBE was present in wells MW1, MW2, MW3, MW4, MW5, MW12, and MW13C at concentrations of
<br />' 11,000 ppb, 580 ppb, 4,500 ppb, 9,000 ppb, 110 ppb, 2,000 ppb, and 80 ppb, respectively No MTBE was
<br /> detected in samples collected from wells MW6,MW7,MW8,MW913, MW10, MWI 1, or MW14B
<br />' Table 5 summarizes groundwater analytical results Figures 4 and 5 present isoconcentratton maps of
<br /> MTBE and benzene in the A zone, respectively Attachment E contains laboratory reports and chain-of-
<br /> custody documentation for groundwater samples collected from wells MW2 through MW 13C in
<br /> tDecember 2003 Attachment F contains graphs of TPHg, benzene, and MTBE concentrations of over
<br /> time in all site wells
<br /> tS 3 Domestic Well Sampling and Analysis
<br /> At the request of EHD, Ground Zero collected water samples from eight nearby domestic wells, including
<br />' the site facility well The samples were collected from either a sample port at the wellhead or from the
<br /> nearest available sampling location (i a garden hose) Samples were collected after the pump was turned
<br /> on for approximately 15 minutes The samples were immediately stored in an ice chest refrigerated to a
<br /> temperature of approximately 4°C and delivered under chain of custody protocol to FGL Laboratories
<br /> (FLAP#1563) and analyzed for volatile organic constituents utilizing EPA Method 524 2 No VOCs were
<br /> detected in any of the samples collected from the nearby domestic wells Copies of the laboratory reports
<br /> were submitted to each property owner separately and a copy was sent to Mr Jeff Wong of EHD
<br /> 6.0 SUMMARY
<br /> Approximately 184 gallons of product/water mixture was removed from well MW 1 during the
<br /> reporting period using a combination of hand bailing and a passive skimmer The passive skimmer was
<br /> removed from the well in late October 2003 to allow for the installation of pump to extract groundwater
<br /> for treatment The skimmer was again deployed in the well between November 21, 2003 and December
<br /> 3, 2003 during a period of system non-operation The measured product thickness during the reporting
<br /> period ranged from zero to 0 15 feet,with an average of 0 076 feet
<br />' The groundwater treatment system was put into operation on November 5, 2003 pursuant to WDR General
<br /> Order No R5-2003-004412 The system generally operated continuously from November 5 through
<br /> G IGROUNDZEITULEBURG\Reports\QMR1200314QM2003 doc
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