ARCHIVED REPORTS XR0002765 - Laserfiche WebLink

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Atlantic Richfield Company • • 3 ARCO Service Station#4932,16 E Harding Blvd,Stockton CA January 5,2001 • 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 • 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 80 feet bgs and will be continuously logged from 20 feet bgs to the total depth of the borings Depth discrete soil and water samples will be collected at 40 feet bgs, 60 feet bgs, and 80 feet bgs using a Simulprobe or similar type sampling device Additional soil and water samples may be collected depending on the lithology encountered 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 wells will be evaluated based on the results of the Simulprobe samples • Groundwater Monitoring Wells. Five groundwater monitoring wells will be installed at the locations shown on Figure 2 The wells will be drilled to a depth of approximately 40 feet bgs using 8-inch diameter hollow-stem augers Groundwater is anticipated to be encountered at approximately 27 feet bgs The wells will be constructed of 2-inch diameter schedule 40 PVC pipe and will be screened from approximately 20 to 40 feet bgs • Permitting The applicable permits for groundwater monitoring wells will be obtained from the SJCEHD, encroachment permits from the City of Stockton, and access agreements of local property owners will be obtained prior to drilling • Soil Selection and Analysis. Soil samples will be collected at 5-foot intervals and will be sent under chain-of-custody procedures to a California State-certified laboratory Selected soil samples will be analyzed for TPHg using modified EPA Method 8015, benzene, toluene, ethylbenzene, xylenes (BTEX) using EPA Method 8020, and oxygenates MtBE, D1PE, TAME, EtBE, TBA, 1,2 DCA, and EDB by EPA Method 8260 • Monitoring Well Development and Sampling. After installation, the monitoring wells will be developed by rigorously surging the well over the length of the screen interval and by purging approximately 10 casing volumes of water After well development, 077 43286 310/WPLAN3 doc