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S E C O R <br /> Ms. Victoria McCartney <br /> September 24, 2004 <br /> Page 2 <br /> ASSESSMENT ACTIVITIES <br /> Assessment activities will consist of the following: <br /> Site Specific Health and Safety Plan <br /> As required by the Occupational Health and Safety Administration (OSHA) Standard <br /> "Hazardous Waste Operations and Emergency Response" guidelines (29 Code of Federal <br /> Regulations Section 1910.120), and by California Occupational Health and Safety <br /> Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" <br /> guidelines (California Code of Regulations Title 8, Section 5192), SECOR will prepare, or <br /> modify the existing, site-specific health and safety plan (SHSP) prior to the commencement <br /> of fieldwork. Field staff and contractors will review the SHSP before beginning field <br /> operations at the site. <br /> Permitting <br /> Applicable permits will be obtained from the San Joaquin County Environmental Health <br /> Department (County) before beginning field activities. <br /> CPT Boring <br /> One CPT boring will be advanced to approximately 130 feet below ground surface (bgs). <br /> The CPT boring will be completed to assess soil lithology, stratigraphy, and potential <br /> petroleum-hydrocarbon impact in the vicinity of the proposed deep groundwater monitoring <br /> well. <br /> Deep Groundwater Monitoring Well <br /> A deep groundwater monitoring well will be installed to assess the vertical extent of <br /> groundwater impact at the site. The borehole for the deep monitoring well will be advanced <br /> in close proximity to the proposed CPT borehole using 8-inch diameter hollow stem augers. <br /> Upon completion of drilling, a 2-inch-diameter groundwater monitoring well with <br /> approximately 5-feet of screen will be installed in the borehole. Specific well details, <br /> including the depth of the monitoring well and screened interval will$s�elected based on soil <br /> conditions identified in the CPT boring. The depth of the proposed monitoring well is <br /> expected to be approximately 80 feet bas. Following well development, a groundwater <br /> sample will be collected and sent under chain-of-custody documentation to a California <br /> State-certified laboratory and analyzed or the presence of total petroleum hydrocarbons as <br /> oYluene ethyl-benzene, total xylenes (BTEX), and <br /> gasoline (TPHg) by EPA Method 8015, <br /> ( methyl tertiary butyl ether (MtBE), by EPA Method 8260. <br /> I:\Chevron\90557\REPORTS\2004\WP for Monitoring Well Installation-2004.doc SECOR International Incorporated <br />