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Monitoring Well Destruction <br /> The destruction of the wells will be in accordance with State and County well destruction <br /> regulations. Groundwater monitoring wells AL-1, AL-2, and AL-4 are constructed of 2-inch- <br /> diameter, flush-threaded schedule 40 polyvinyl chloride (PVC). The wells are screened from <br /> 5 to 27 feet below ground surface with 0.020-inch slotted casing. The well will be over- <br /> drilled using a truck-mounted drilling rig equipped with 8-inch-outside-diameter hollow-stem <br /> augers to the bottom of the well. Atter the well casing, sand pack, transition seal, and grout <br /> have been drilled out, a cement-bentonite slurry will be tremied from the bottom of the <br /> borehole to the ground surface. <br /> If cuttings are generated, the soil will be temporarily stored at the ARCO facility on plastic <br /> sheeting and covered with plastic, separate from the well debris. Stockpile soil samples will <br /> be collected from any cuttings generated from the drilling and analyzed for the presence of <br /> benzene,ethylbenzene, toluene, and xylenes (BETX), total petroleum hydrocarbons as gasoline <br /> (TPH-G), using U.S. Environmental Protection Agency (EPA) Method 8020 and 8015 <br /> 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 /> Exhibit A describes Brown and Caldwell field procedures for sampling from stockpiles and <br /> sample handling. <br /> PROJECT SCHEDULE <br /> The fieldwork will require approximately one day to complete. The starting date will depend <br /> on County approval of the work plan and on driller availability. <br /> A summary report in letter form will be completed within approximately 3 weeks after field <br /> work is complete. The report will include a description of field methods and conclusions. <br /> The report will be submitted to ARCO for review, and the final report will be provided to the <br /> County and RWQCB for review. <br /> Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this <br /> document. <br /> 2697\RFP0RT3U697-01.W P <br />