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Stantec May 6, 2009 Page 4 of 5 surface to 20 feet bgs. First water was observed in GP-1 through GP-4 at 10 feet bgs. Copies of the soil boring logs are included in Attachment C. Groundwater Sampling Following the soil sampling activities, grab groundwater samples were collected from each boring. After collection of the deepest soil sample of each boring, a temporary poly vinyl chloride (PVC) 0.75-inch-diameter 0.02-inch-slot well screen was lowered within the direct-push rods. The rods were then raised to a point above the current depth to water and water was allowed to enter the casing. Prior to collection of each water sample, the depth to water was measured in the temporary casing. A clean disposable bailer was then used to collect the grab groundwater sample from each soil boring. The water samples were collected by lowering a 0.5-inch-diameter disposable bailer through the temporary 0.75-inch-diameter PVC casing to groundwater. The groundwater was bailed from the casing, decanted from the bailer into 40-ml VOA vials, and capped. Each VOA vial was checked to ensure no bubbles were present, labeled, placed on ice in an insulated container, and transported to Kiff under COC documentation. The water samples were analyzed for TPHg, BTEX, MtBE, DIPE, ETBE, TAME, TBA, 1,2-DCA and EDB by EPA Method 8260B. The water sample collected from GP-1 was also analyzed for TPHmo using EPA Method 8015M. ANALYTICAL RESULTS Soil Sample Analytical Results TPHg, TPHmo, BTEX, MtBE, DIPE, ETBE, TAME, TBA, 1,2-DCA and EDB were not detected above laboratory reporting limits in any of the soil samples collected during this investigation. Soil sample analytical results are summarized in Table 1. Copies of the certified analytical laboratory reports and COC documentation are presented in Attachment D. Groundwater Sample Analytical Results With the exception of 1,200 micrograms per liter (ug/L) TPHmo in boring GP-1 and 1.9 ug/L MTBE in boring GP-4, no other contaminants were detected above laboratory reporting limits in groundwater samples collected from borings GP-1 through GP-4. The 1,200 ug/L detection of TPHmo in GP-1 represents the highest valid results reported by the laboratory (Attachemnt D). Water sample analytical results are summarized in Table 2. Copies of the certified analytical laboratory reports and COC documentation are presented in Attachment D. WASTE DISPOSAL ACTIVITIES Stockpile and Excavation Backfill Soil generated during drilling was temporarily stored onsite in properly labeled 55-gallon drum. Belshire Environmental Services, Inc. transported the non-hazardous soil on April 7, 2009. One drum of soil was recycled at the TPS Technologies Soil Recyclers facility located in Adelanto, California. Copies of the waste disposal documentation are provided in Attachment E. 14113 Soil and Groundwater Assessment Results.doc