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i <br /> Former Beacon Station No474 September 22,2005 <br /> Stockton California Work Plan for an Additional Subsurface Investigation <br /> 100 feet bsg; and advance monitoring wells MW-20 and MW-21 to <br /> approximately 100 feet bsg and set 5 feet of screen at approximately 95 to 100 <br /> feet bsg; complete monitoring well construction to estimated specifications <br /> indicated on the well construction diagrams in Appendix C. <br /> Task 3 Submit soil samples, under chain of custody documentation, to a state-certified <br /> laboratory; analyze selected.soil samples from the soil borings for TPHg, the <br /> volatile .aromatic compounds benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX), the fuel oxygenate MTBE, and DCA by EPA Method 8260B; analyze <br /> the stockpile soil sample for TPHg, BTEX and MTBE by EPA Method 8260B <br /> and for total lead by EPA Method 6010. <br /> Task 4 Develop and sample the monitoring wells; survey the location and top-of- <br /> casing (TOC) elevation of the new wells to GeoTracker specifications. <br /> Task 5 Submit the groundwater samples, under chain of custody documentation, to a <br /> state-certified laboratory; analyze groundwater samples for TPHg, BTEX, and <br /> the fuel oxygenates MTBE, -diisopropyl ether (DIPE), ethyl-t-butyl ether <br /> (ETBE), tert-amyl methyl ether (TAME), tert-butanol (TBA), methanol, <br /> ethanol and the lead scavenger,compounds DCA and 1,2-dibromoethane (EDB) <br /> by EPA Method 8260B. <br /> Task 6 Document the performance and results of the groundwater investigation in a <br /> report; update the SCM based on the new data; include in SCM <br /> isoconcentration maps and estimates of remaining mass of analytes of concern <br /> and further discussion regarding potential and recognized migration pathways, <br /> and observed plume migration. <br /> 1474wp9-05 <br /> Project No. 1474.16 5 HORIZON ENVIRONMENTAL INC. <br />