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(SV <br /> kT C <br /> A S S O C I A T E S I Iii C <br /> were collected and analyzed. Site activities were summarized in JPCAs 2nd Phase II <br /> Environmental Assessment Report, dated October 25, 2000. <br /> In January 2003, GHH Engineering, Inc. (GHH) advanced three cone penetrometer borings and <br /> three soil borings to depths ranging from 104 feet bgs to 122 feet bgs. <br /> In May 2003, GHH advanced four soil borings, MW6a, MW6b, MW7a, and MW7b to the east of <br /> the site. These borings were completed as well clusters with MW6 and MW7a advanced to a <br /> depth of approximately 75 feet bgs, and MW6b and MW7b advanced to a depth of <br /> approximately 94 feet bgs. GHH also installed well EW1 in the southeast portion of the site. <br /> Site activities were summarized in GHH's Second Quarter 2003 Groundwater Monitoring <br /> Report and Additional Assessment Report, dated June 2003. <br /> ATC installed five ozone injection points IW1 through IW5 according to GHH's Interim <br /> Groundwater Treatment System Installation Workplan, dated October 2003. The details of this <br /> work will be discussed in a report currently being prepared by ATC. <br /> ATC installed monitoring wells MW8, MW9a, MW9b, and MW9c according to GHH's <br /> Additional Assessment Workplan, dated October 2003. The details of this work will be discussed <br /> in a report currently being prepared by ATC. <br /> SAMPLING ACTIVITIES <br /> On March 17, 2004, ATC personnel collected groundwater samples from monitoring wells MWl <br /> through MW5, MW6a, MW6b, MW7a, MW7b, MW7c, MW8, MW9a, MW9b, MW9c, and <br /> EWL The locations of the wells are shown on Figure 2. Prior to collection of groundwater <br /> samples, the depth to water, pH, electrical conductivity, and temperature were measured in <br /> groundwater purged from the monitoring wells and recorded. A minimum of three well casing <br /> volumes were purged from each monitoring well prior to sampling. The wells were allowed to <br /> recover and samples were collected from each well using disposable polyethylene bailers. After <br /> samples were collected, dissolved oxygen (DO) concentrations were measured. All on-site wells <br /> were surveyed by a California Licensed Land Surveyor and that data is included in Attachment 3. <br /> The groundwater samples collected from each well were submitted to State-certified Argon <br /> Laboratories Inc. (FLAP Cert. No. 2359) in Ceres, California for chemical analyses of total <br /> petroleum hydrocarbons as gasoline (TPHg) and total petroleum hydrocarbons as diesel (TPHd) <br /> utilizing EPA Method 801513; benzene, toluene, ethylbenzene, and xylenes (BTEX) utilizing <br />- EPA Method 8021 B; and methyl tertiary butyl ether (MTBE); ethyl tertiary butyl ether (ETBE) <br /> di-isopropyl ether (DIPS), tertiary amyl ether (TAME), tertiary butyl ether (TBA), 1,2- <br /> dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB) utilizing EPA Method 8260B. <br /> Groundwater well purge and sample logs are contained in Attachment 1. <br /> • <br /> s:1268231QM reports12004 1QR.doc 2 <br />