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ionudakis Firewood, Inc. Page 3 of 9 Francisco Bay Region (CRWQCB, 2008). Although the Site is not in residential use, the most environmentally conservative values were used for the assessment of this Site. The assessment assumes the Site has the potential for Residential Use with Groundwater being a Potential Drinking Water Resource. Analytical results from the EHD Site Investigation are summarized in Table 1 and Table 2. Based on the reported release and information provided during the EHD Site Investigation, Ground Zero submitted the Workplan for Subsurface Investigation and Soil Excavation dated October 19, 2009 to EHD. In a letter dated November 2, 2009 EHD approved the workplan (Attachment A). The following report documents the work performed in accordance with the Workplan for Subsurface Investigation and Soil Excavation. 2.0 STORM DRAIN TEST In an effort to determine if the storm drain system was impacted with diesel, motor oil, and kerosene range organics requiring the system to be pressure washed, Ground Zero performed a low volume flush test of storm drain system from the AST location to the former storm water basin. There are five (5) catch basins (CB #1 — CB #5) located from the AST area down flow gradient to the Pit. The Pit represents the catch basin with an effluent flow to the abandoned storm basin pond and is used to be consistent with terminology used during the EHD site investigation. Water samples were collected from the three main sections of the storm drain system, the supply well, and a cumulative sample from a large baker tank stored near the SBC (Baker Tank). 2.1 Storm Drain Test Procedure On November 14, 2009, Eric Price and Joe Vazquez of Ground Zero met with Del-Tech Geotechnical Support Services of Oakdale, California (Del-Tech) at the Site. Mr. Price discussed the testing procedure with Mr. Vasquez and Mr. Light and observed the initial set-up prior to leaving the Site. Figure 3 shows the storm drain system and includes the sample locations. The procedure is outlined as follows: 1. Joe Vasquez used a trailer mounted baker tank filled with water from the on-site supply well to control the release of approximately 250-gallons of water into the effluent pipe of CB #1 and allowed the water to flow to CB #2. Prior to releasing the water, a pump was placed inside of CB #2 to capture the incoming water stream. The captured water was pumped into a baker tank stored on the back of a truck operated by Del-Tech. Toward the end of the flush Mr. Vasquez collected a sample of the effluent water stream (Sample 1), carefully transferred to the appropriate containers, checked for headspace, uniquely labeled, temporarily stored in an ice chest refrigerated to a temperature of approximately 4°C pending delivery under chain of custody protocol to Argon Laboratories [Argon (ELAP #2359)] for analysis. While the samples were being prepared by Mr. Vasquez, Del-Tech emptied the captured water into a large capacity baker tank staged near the Pit (Baker Tank), refilled the trailer mounted baker tank, and positioned the equipment on the next section of storm drain pipe. G:IGROUNDZEILIONUDAKISIReportslSite Assessment and Excavation Report.doc March 2010