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l I Atlantic Richfield Company 3 ARCO Service Station#595,6100 North Highway 99,Stockton,CA November 30 2000 (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), SECOR has prepared a Site-Specific Health and Safety Plan prior to the commencement of fieldwork The Site-Specific Health and Safety Plan will be reviewed by the field staff and contractors before beginning field operations at the site and is included as Attachment B The specific scope of work is discussed below • Soil Borings. Two soil borings will be drilled at the locations shown on Figure 2 using 8-inch diameter hollow-stem augers The soil borings will be drilled to a total depth of 100 feet bgs and will be continuously logged from 50 feet bgs to the total depth Of the borings Depth discrete water samples will be collected at 75 feet bgs, 90 feet bgs, and 100 feet bgs using a Simulprobe or similar type sampling device Upon completion of drilling, the borings will be backfilled with cement grout from the bottom of the borings to the surface The need for future deep, discretely screened monitoring well will be evaluated based on the results of the Simulprobe samples If necessary, a addendum to this work plan will be submitted • Groundwater Monitoring Wells. Three groundwater monitoring wells (MW-5 through MW-7) will be installed at the locations shown on Figure 2 Soil borings for well installation will be drilled using 8-inch diameter hollow stem augers Upon completion of drilling, a 2-inch diameter groundwater monitoring well will be installed in each boring Groundwater is anticipated to be encountered at approximately 55 feet bgs The wells will be screened from approximately 45 to 65 feet below ground surface • Permitting The applicable permits for groundwater monitoring wells and soil borings will be obtained from the SJCEHD prior to drilling Additionally, for the offsite wells, the appropriate encroachment permits and/or access agreements will be obtained prior to drilling • Soil Sampling and Analysis. For the soil borings, a simulprobe sampling device will be used to collect discrete groundwater samples at approximate depths of 75, 90, and 100 feet bgs For the groundwater monitoring wells, soil samples will be collected at 5-foot intervals All samples collected will be sent under chain-of-custody procedures to a California State-certified laboratory Selected soil and groundwater samples will be analyzed for total petroleum hydrocarbons calculated as gasoline (TPH-g) using modified EPA Method 8015, and benzene, toluene, ethylbenzene, and xylenes using EPA Method 8020, and fuel 077 43029 31 OMPLAN Nov 2000 doc