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�r Results of Limited Subsurface Investigation and Fourth Quarter 1999 Groundwater Monitoring Report <br /> Moore Petroleum,5491 F Street,Banta,California <br /> results of all soil and water sampling were documented in the report Tank Closure Results and <br /> Recommendations Report dated December 23, 1998. <br /> On April 8 and 9, 1999, Apex personnel supervised the advancement of eight soil borings at the <br /> subject property (Figure 2). The results of all soil and water sampling were documented in the <br /> report entitled Results Report for Subsitiface Investigation and Second Quarter 1999 <br /> GroundivaterMonitoring dated June 1, 1999. <br /> Apex submitted a Workplan for Limited Subsinface Investigation dated August 6, 1999, <br /> proposing the installation of four additional groundwater monitoring wells. <br /> SOIL BORING, SAMPLING, AND ANALYSIS <br /> In accordance with Apex's August 6, 1999 Workplan, Apex personnel supervised the drilling of <br /> four soil borings (MW-4A, MW-7, MW-8, and MW-9) on October 19, 1999, at the locations <br /> indicated on Figure 2. The borings were drilled by Woodward Drilling Company of Rio Vista, <br /> California, to depths of 20 feet below grade (bg) using the hollow-stem auger drilling technique. <br /> The drilling was conducted according to the Apex Standard Operating Procedures (SOP) included <br /> as Appendix A. <br /> Soil samples were collected from the four borings for classification and selection for laboratory <br /> analysis of petroleum hydrocarbons. All soil samples were submitted for analysis, under chain-of- <br /> custody, to Sparger Technology of Sacramento, California, a state-certified analytical laboratory. <br /> Soil samples were analyzed for: a) TPH, as gasoline; TPH, as diesel; TPH, as kerosene by <br /> modified EPA Method 8015; b) BTEX by EPA Method 8020; and c) five oxygenates by EPA <br /> Method 8260. <br /> Well construction and soil boring logs are included as Appendix B. The soil analytical results are <br /> summarized in Table 1. Laboratory reports and chain-of custody forms are included as Appendix <br /> C. <br /> MONITORING WELL INSTALLATION AND DEVELOPMENT <br /> Three of the four soil borings (MW-4A, MW-7, and 1AW-9) were converted into 2-inch-diameter <br /> groundwater monitoring wells, and one boring (MW-8) was converted into a 4-inch diameter <br /> well. Following installation, the wells were developed and surveyed relative to a common bench <br /> mark according to the Apex SOP. <br /> 3 <br />