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CAARAW . October 14, 1993 Working To Restore Nature ARCO Station No 548, Sacramento, California � I o Monitor the completion of the 10-inch-diameter boring as a 4-inch-diameter vapor- extraction well by a licensed driller to approximately 45 feet bsg and the 8-inch- diameter boring as a 2-inch-diameter monitoring well Typical well construction designs are shown on Plates 3 and 4 We will develop and purge the morutoring well. o Collect four soil samples from the drill cuttings These samples will be composited by the laboratory o Submit four soil samples from each boring and the samples from the drill cuttings to a laboratory for analyses of total petroleum hydrocarbons as gasoline (TPHg) using modified Environmental Protection Agency (EPA) Method 8015 and benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) using EPA Method 8020 In addition, the samples collected from the drill cuttings will also be analyzed for total lead using EPA Method 7421 for soluble threshold limit concentration (Waste Extraction Test), and corrosivity, ignitability, and reactivity to evaluate disposal options. o Contract a licensed surveyor to survey the location of the wells with respect to onsite wells and the elevation of the wells with respect to mean sea level o Interpret field and laboratory data to evaluate the extent of dissolved hydrocarbons in groundwater downgradient of the site o Prepare a Status Report that includes field and laboratory data and summarizes our findings, conclusions, and recommendations With ARCO's authorization, the report will be submitted to the appropriate regulatory agencies RESNA will conduct the work in accordance with a Site Safety Plan that will be updated for the work site The work will be performed according to the methods and procedures described in RESNA's Work Plan No 30004-4W, dated August 8, 1991, and prepared using the Central Valley Regional-Board Staff Recommendations for Initial Evaluation and Investigation of Underground Tanks (Tri-Regional Recommendations), Appendix A of the Tri-Regional Recommendations, and the Leaking Underground Fuel Tank Manual (LUFT) as references The methods for installation and construction of vapor-extraction wells are described in the attached Field Procedures Remediation of soil will not be performed during this phase of work We recommend copses of this addendum work plan be forwarded to Ms Mary Meays, San Joaquin Public Health Services, Environmental Health Division, P O Box 2009, Stockton, • 30004-1 300D4-lUW 2