ARCHIVED REPORTS_XR0012366 - Laserfiche WebLink

Home Browse Search

Ell�yt� I • Ms Margaret Lagono December 22, 2004 Page 2 and total xylenes (BTEX) by EPA Method 8021, and total petroleum hydrocarbons as gasoline (TPHg) by EPA Method 8015 Modified Groundwater samples collected from wells MW-1 through MW-11, MW-20, MW-21 and NP-1 were analyzed for fuel oxygenate compounds methyl tertiary butyl ether (MtBE), tertiary-amyl methyl ether (TAME), tert butanol (TBA), dnsopropyl ether (DIPS), ethyl tertiary butyl ether (EtBE) using EPA Method 8260B Additionally, groundwater samples collected from wells MW-1 through MW-11, MW-17 through MW-20 and NP-1 were analyzed for lead scavengers 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) using EPA Method 8260B Cumulative groundwater sampling analytical results are summarized in Table 1 and Table 2 Dissolved concentrations of benzene, TPHg, MtBE, and 1,2-DCA in groundwater for fourth quarter 2004 are presented on Figure 5 and Figure 6 Copies of the groundwater sampling information sheets are included in Attachment B Laboratory analytical results with chain-of- custody documentation are included in Attachment C Concentrations of MtBE were not reported at or above laboratory reporting limits in any of the groundwater samples submitted for analysis during the fourth quarter 2004 ITPHq_Concentrations lie • Concentrations of TPHg decreased since July 2004 in wells MW-2, MW-10, and MW-14 • Concentrations of TPHg increased since July 2004 in wells MW-3, MW-6, MW-11, MW-15, and MW-20 tBenzene Concentrations • Concentrations of benzene decreased since July 2004 in wells MW-2, MW-10, MW-14, and MW-15 • Concentrations of benzene increased since July 2004 in wells MW-3, MW-4, MW-11 through MW-13, MW-20, MW-21, and NP-1 1.2 DCA Concentrations ' Concentrations of 1,2-DCA, ranged between 1 2 micrograms per liter (Ng/L) and 100 pg/L, and were reported in wells MW-2, MW-4, MW-5, MW-10, and MW-17 through MW-19 during the fourth quarter 2004 ' Ozone Microsparcie System Description ' The C-SpargeTM system includes an ozone generator, an air compressor, and a programmable timer/controller The ozone is entrained into the air stream at low flow rates of 2 to 6 cubic feet per minute The C-Sparge-W system utilizes ozone microsparging a process where ozone is entrained into an airstream and introduced into groundwater through specially designed sparge points to create "microbubbles " As these microbubbles rise within the column of water, . dissolved volatile organic compounds (VOCs) including petroleum hydrocarbons are oxidized The system cycles the ozonelair mixture between five micro-sparge points (SP-1B, SPA C, ' k1DcsacramentolprojectslProjects10694012859-357TinaRReports12859 4th Off 04 QMR RSR doc ' �'� Celebrating 35 Years of Excellence in Environmental Services