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Page 4 of 7 <br /> Results Report for Limited Subsurface Investigation <br /> Third Quarter 2000 Groundwater Monitoring Report <br /> Moore Petroleum Bulk Plant,5491 F Street,Banta,California <br /> Deep Soil Boring <br /> Boring SB-Deep was located at the source area of petroleum contamination at the site. Boring <br /> SB-Deep was advanced to assess the vertical extent of petroleum contamination in soil and <br /> groundwater near well MW-8 (Figure 2). Boring SB-Deep was drilled to a depth of 39 feet with <br /> soil samples being collected continuously. Field screening of the soil sample intervals indicated <br /> slight concentrations of volatile organic compounds between the surface and the 25-feet bgs <br /> level. Apex and Ms. Margaret Lagorio with the County selected the soil sample intervals that <br /> were submitted for laboratory analysis. The sample intervals selected were based on field <br /> observations including soil lithology, visual and olfactory observations, depth to first <br /> encountered groundwater, and headspace readings taken with a photoionization device in the <br /> field. Groundwater and slight petroleum odors were first detected at 9-feet bgs in boring SB- <br /> Deep. At 13-feet bgs, clayey silt was encountered to 27-feet bgs. However, at 25-feet bgs, the <br /> soil became moist not saturated suggesting an impermeable layer. In addition, no odors were <br /> detected at the 25-to 27-feet bgs interval. From 27-feet bgs to the bottom of the boring (39-feet <br /> bgs) medium grained micaceous sand was encountered. The sand was saturated and free of <br /> petroleum odors. Apex and the County chose the samples from 5-, 10-, 15-, 20-, 25-, 30-, 35-, <br /> 37-, and 39-feet bgs from boring SB-Deep for submission to the analytical laboratory. <br /> Well Construction Details <br /> As previously mentioned, borings MW-10, MW-11, and MW-12 were converted to 2-inch <br /> diameter monitoring wells. Well construction details and boring logs are included in Appendix <br /> B. The wells were installed, surveyed, and developed in accordance with Apex Standard <br /> Operating Procedures (SOP) included with this report in Appendix C. <br /> Soil Analytical Results <br /> Soil samples collected were submitted to Acculabs, Inc. of Davis California, a state-certified <br /> laboratory for analysis of- <br /> Analysis <br /> f:Anal sis USEPA Method No. <br /> TPH as Gasoline 8015 Modified <br /> TPH as Diesel 8015 Modified <br /> TPH as Kerosene 8015 Modified <br /> BTEX 8020 <br /> Five Fuel Oxygenates 8260 <br /> TBA, MTBE, DIPE,ETBE, and TAME <br /> Fuel Additives 8260 <br /> EDB and 1,2-DCA) <br />