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<br /> Ms Margaret Lagorio
<br />' October 1, 2004
<br /> Page 2
<br />' Method 8015 Modified Groundwater samples collected from wells MW-1 through MW-11,
<br /> MW-20, MW-21 and NP-1 were analyzed for fuel oxygenate compounds methyl tertiary butyl
<br /> ether (MtBE), tertiary-amyl methyl ether (TAME), tert butanol (TBA), diisopropyl ether (DIPE),
<br /> ethyl tertiary butyl ether (EtBE) using EPA Method 8260B Additionally, groundwater samples
<br /> collected from wells MW-1 through MW-11, MW-17 through MW-20 and NP-1 were analyzed for
<br /> lead scavengers 1,2 -dibromoethane (EDB), and 1,2-dichloroethane (1,2-DCA) using EPA
<br /> Method 82608
<br /> Cumulative groundwater sampling analytical results are summarized to Table 1 and Table 2
<br /> Dissolved concentrations of benzene, TPHg, MtBE, and 1,2-DCA in groundwater for third
<br /> quarter 2004 are presented in Figure 5 and Figure 6 Copies of the groundwater sampling
<br /> information sheets are included in Attachment B Laboratory analytical results with chain-of-
<br /> custody documentation are included in Attachment C Concentrations of MtBE were not
<br />' reported at or above laboratory reporting limits in any of the groundwater samples submitted for
<br /> analysis during the third quarter 2004
<br /> TPHq Concentrations
<br /> • Concentrations of TPHg decreased since April 2004 in wells MW-3, MW-6, MW-10 through
<br /> MW-12, MW-16, and MW-18 through MW-21
<br /> • Concentrations of TPHg increased since April 2004 in wells MW-2, MW-14, and MW-15
<br />' Benzene Concentrations
<br /> • Concentrations of benzene decreased since April 2004 in well MW-2, MW-3, MW-6, MW-10
<br /> through MW-12, MW-16, MW-18, MW-19, and MW-21
<br /> • Concentrations of benzene increased since April 2004 to wells MW-14 and MW-16
<br /> • Benzene has not been reported in well NP-1 at or above laboratory reporting limits since
<br /> November 2000
<br />' 1,2 DCA Concentrations
<br />' Concentrations of 1,2-DCA, ranged between 1 2 micrograms per liter (ug/L) and 96 pg/L, and
<br /> were reported in wells MW-4, MW-5, MW-7, MW-10, MW-11, MW-17, and MW-19 during the
<br /> third quarter 2004
<br /> Ozone Microsparge System Description,
<br /> The C-SpargeTM system includes an ozone generator, air compressor, and a programmable
<br />' timer/controller The C-SpargeTM system utilizes ozone microsparging a process where ozone
<br /> is entrained in air and introduced into groundwater The ozone is infected at low flow rates of 2
<br /> to 6 cubic feet per minute through specially designed sparge points to create "microbubbles "As
<br />' these microbubbles rise within the column of water, dissolved volatile organic compounds
<br /> (VOCs) including petroleum hydrocarbons are oxidized The system cycles ozone/air infection
<br /> between five micro-sparge points (SP-1B, SPA C, SP-2B, SP-2C, and SP-3B) Sparge points
<br />' J IProtects10694012859-357TinaRRepodsQrd Qtr 04-QMR RSR12859 3rd Qtr 04-QMR RSR doc
<br />' Celebrating 35 Years of Excellence In Environmental Services
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