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S E C ® R • Mr Harlan Knoll January 14, 2004 Page 5 bgs, and within the boring for well MW-9 from approximately 81 feet to 83 feet bgs Soils within these borings were consistent with those encountered in deep soil boring SB-1, which was continuously cored to a depth of 64 feet bgs Groundwater was first encountered in the three deep soil borings at approximately 40 feet bgs Wet soils were generally encountered within sand and silty sand layers from approximately 40 feet to 41 5 feet bgs to the total depth explored in each of the soil borings (approximately 110 5 to 111 5 feet bgs) Groundwater appears to be present under semi-confined conditions Following the development of wells MW-8 through MW-10 on December 10, 2003, static depth to water levels were recorded between 37 59 feet and 39 24 feet bgs (Table 3) Groundwater flows within the deeper water-bearing zone toward the northeast at a hydraulic gradient of 0 003 foot/foot (ft/ft) A groundwater elevation contour map is included as Figure 5 Soil Analytical Results Petroleum hydrocarbons and MtBE were not detected above laboratory method reporting limits in any of the soil samples analyzed (Table 2) Soil analytical results are shown on Figure 3, and are included in Attachment 5 . Groundwater Analytical Results With the exception of a concentration of a detection of total xylenes in well MW-8 at 1 5 ppb, petroleum hydrocarbons and fuel oxygenates were not detected in groundwater samples collected from deep wells MW-8 through MW-10 (Table 3) Groundwater analytical results are shown on Figure 4, and are included in Attachment 6 Removal of Soil Cuttings and Rinsate/Purge Water Soil cuttings and ansate water generated during the installation of wells MW-8 through MW-10 were temporarily stored on-site In an open-top roll-off bin, covered with plastic sheeting Under Non- Hazardous Waste Manifest No 90904, approximately 2,400 gallons of groundwater were pumped from the bin during the course of drilling activities by a vacuum truck supplied by Filter Recycling Services, Inc (FRS) of Rialto, California, and transferred to their facility for treatment and reuse Following waste profiling, the roll-off bin containing the soil cuttings was removed under non- hazardous waste manifest 91877 from the site on December 22, 2003 An additional drum containing residual soil cuttings was removed under non-hazardous waste manifest 86959 on December 31, 2003 Non-hazardous waste manifests are included in Attachment 8 Purge water generated during well development activities on December 10, 2003 was stored in State of California, Department of Transportation (DOT)-approved 55-gallon steel drums, pending waste characterization Also on December 10, 2003, residual water within the roll-off bin containing the soil cuttings was pumped into two DOT-approved 55-gallon drums Following waste profiling, a total of six drums containing ansate/purge water were removed from the site under non-hazardous waste manifest 86959 by FRS on December 31, 2003, and transported to their facility for treatment and recycling k F } 9 I\ConocoPhdlips\Tosco Marketing186711ReportslAssessment Rpt doc SECOR International Incorporated s a V