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S E C 0 R <br /> Ms. Victoria McCartney <br /> November 24, 2004 <br /> Page 3 <br /> PERMITTING <br /> Applicable permits will be obtained from the City of Ripon and the County, as necessary, <br /> prior to commencing field operations. <br /> UNDERGROUND UTILITY LOCATING <br /> Underground Service Alert (USA) will be notified at least 48 hours prior to commencing field <br /> activities to identify any public utility alignments that may be in conflict with the proposed <br /> monitoring wells and soil vapor probes. In conjunction with the USA, a private utility <br /> locating company must be utilized for clearing proposed monitoring well and soil vapor <br /> probe locations for underground utilities. <br /> MONITORING WELL INSTALLATION <br /> Two boreholes for monitoring wells will be advanced using a hollow-stem auger to a depth <br /> of approximately 40 feet bgs. An attending geologist will log cuttings and sample in <br /> accordance with ASTM D-2488 — Standard Practice for Description and Identification of <br /> Soils (Visual-Manual Procedure). Upon completion of drilling, a 2-inch diameter <br /> groundwater monitoring well, screened from approximately 25 to 40 feet bgs, will be <br /> installed in the boring. <br /> Soil Analysis <br /> Selected soil samples will be submitted under chain-of-custody documentation to a <br /> California State certified laboratory and analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHg) and methanol by EPA Method 8015, benzene, toluene, ethylbenzene, and <br /> total xylenes (BTEX), MtBE, tertiary butyl alcohol (TBA), di-isopropyl ether (DIPS), ethyl <br /> tertiary butyl ether (EtBE), tertiary amyl methyl ether (TAME), 1,2-dichloroethane (1,2- <br /> DCA), and 1,2-dibromoethane (EDB) by EPA 8260. <br /> Monitoring Well Development and Sampling <br /> Commencing at least 72 hours after installation, the monitoring wells will be developed by <br /> surging the well over the length of the screen interval then purging approximately 10 casing <br /> volumes of water. Following development, groundwater samples will be collected from <br /> each well and sent under chain-of-custody documentation to a California State-certified <br /> laboratory and analyzed for the presence of TPHg and methanol by EPA Method 8015, <br /> BTEX, MtBE, TBA, DIPE, EtBE, TAME, 1,2-DCA, and EDB by EPA 8260. <br /> li I:\Chevron\91452\REPORTS\2004\monitoring well work plan 2004 rev a.doc <br /> i <br />