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I'D CLEARWATER G R O U P Envirommen[ni activities was collected into a 55 -gallon drum, sealed, and transported back to the Clearwater yard for disposal. InStrat, Inc. (Instrat) of Rio Vista, California, removes the purge water on an as-needed basis . Groundwater Monitoring Activities On October I and October 5 , 2009, the third quarter 2009 groundwater-monitoring and sampling event was conducted. According to Clearwater' s April 3 , 2009 Site Conceptual Model, Clearwater hypothesized that hydrocarbon impacts are present in soil and groundwater between 20 and 25 feet (Il) below ground surface (bgs); In an effort to test this hypothesis, and in response to discussions about placing the low-flow sample port within the lower screened interval of the wells (as opposed to the placement at 15 feet bgs), the sample port was set towards the bottom of the well screen in each well (for detail, please see the Table A below). It is acknowledged that collecting samples to evaluate rebound effects while simultaneously evaluating the lower well screen interval impacts would not be possible; Two samples per well would need to be collected in order to provide "control" samples for proper evaluation. However, funding limitations dictated sample collection and laboratory analysis of only one sample per well . Table A — Sample Port Depth Location within Well Monitoring Well Screened Interval Sample Port Location Previous Low-Flow (ft bgs) Port Location (ft bgs) MW- 1 6-26 23 15 MW-2 6-26 22 15 MW-3 6-26 22 15 MW-4 5- 19 18 15 MW-513 5-25 18 15 MW-6 5-20 17 15 MW-7 5 -25 22 15 MW-8 5 -25 20 15 IW-3 10-25 22 .5 Not sampled DPW- I 10-30 22 15 AS - 1 22-25 23 23. 5 Laboratory Analysis Groundwater samples collected during this event from wells MWA through MW-4, MW-6, and MW-7 were analyzed for concentrations of total petroleum hydrocarbons as gasoline (TPH-g) and benzene, toluene, ethylbenzene, and total xylenes (known collectively as BTEX) . Groundwater samples collected from wells MW-513, MW-8, DPW- 1 , AS- 1 , and IW-3 were analyzed for TPH-g, BTEX, five fuel oxygenates (methyl tertiary butyl ether [MTBE] , di- isopropyl ether [DIPE], ethyl tertiary butyl ether [ETBE], tertiary amyl methyl ether [TAME], tertiary butyl alcohol [TBA]), 1 ,2-dichloroethane ( 1 ,2-DCE), and 1 ,2-dibromoethane ( 1 ,2-EDB) by EPA Method 8260B by Kiff Analytical, LLC (Kifl), a State of California Department of Health Services-certified laboratory located in Davis, California. The analytical reports including ZB 178N — Barnes Trucking Facility 2 November 2009 Third Quarter 2009 Quarterly Monitoring Report