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Mr. Kyle Christie <br /> September 12, 1995 <br /> Page 2 <br /> Scope of Work <br /> On August 18, 1995, BC personnel supervised the over drilling and abandonment of three on- <br /> site groundwater monitoring wells. The well abandonment was conducted by Woodward <br /> Drilling of Rio Vista, California. <br /> Summary of Field Work <br /> The well abandonment was conducted as described in BC's July 20, 1995 work plan (included <br /> with this report as Appendix A) and in accordance with state and county well destruction <br /> regulations. Mr. Harlin Knoll of the County was on site to witness the well abandonment. <br /> The wells were abandoned under County well destruction permit number 006975. A copy of <br /> the permit is included with this report as Appendix B. <br /> The dill cuttings generated during the well abandonment process were stockpiled on site <br /> enveloped in plastic. At the conclusion of the drilling, the soil stockpile was sampled for <br /> disposal profiling. The stockpile sample was submitted to a ARCO contract laboratory for <br /> analysis of benzene,ethylbenzene,toluene,and xylenes(BETX),total petroleum hydrocarbons <br /> as gasoline (TPH-G), using U.S. Environmental Protection Agency (EPA) Method 8020 and <br /> 8015 Modified, reactive sulfides and cyanides by EPA Method 9010, corrosivity (pH) by EPA <br /> Method 9045, Ignitability (flash point) by EPA Method 1010, and Soluble Threshold Limit <br /> Concentration for lead by EPA Method 6010/7000 series. Upon receipt of the laboratory <br /> report, BC will forward the results to ARCO's contracted soil disposal trucking company. <br /> One 55-gallon drum of water was generated from the steam cleaning process. This water will <br /> be disposed of by Integrated Wastestream Management. <br /> ARCO has received a case closure summary letter from the County dated August 23, 1995. <br /> The letter states that "based on the available information including current land use, and with <br /> the provision that the information provided to this agency was accurate and representative of <br /> site conditions, no further action related to the underground storage tank release is required. <br /> A copy of the August 23, 1995 letter is included with this report as Appendix C. <br /> Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this <br /> document. <br /> 2697TREP0RTSDRU.LSUAWP5 <br />