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S E C 0 R <br /> Ms. Lori Duncan <br /> February 18_2005 <br /> Page 3 <br /> WELL MONITORING WELL INSTALLATION <br /> Six boreholes will be advanced to a depth of approximately 30 feet below ground surface <br /> (bgs). An attending geologist will log cuttings and sample in accordance with American <br /> Society for Testing and Materials (ASTM) D-2488 — Standard Practice for Description and <br /> Identification of Soils (Visual-Manual Procedure). Upon completion of drilling, a 2-inch <br /> diameter groundwater monitoring well, with approximately 15 feet of screen, will be installed <br /> in the boring. <br /> Well Development <br /> Following installation, the monitoring well cement seals will be allowed to cure for 48-hours, <br /> then each well will be developed by rigorously surging the well over the length of the screen <br /> interval and by purging approximately 10 casing volumes of water. Water quality <br /> measurements includingconductivity, turbidity, temperature and pH will be collected during <br /> Y Y <br /> well development activities. After well development, ground water samples will be collected <br /> from the wells, delivered under standard chain-of-custody manifest to a California state- <br /> certified laboratory and analyzed for the presence of petroleum hydrocarbons. <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 the presence of petroleum <br /> hydrocarbons and fuel oxygenates including total petroleum hydrocarbons as gasoline <br /> (TPHg) by EPA Method 8015, benzene, toluene, ethylbenzene, total xylenes (BTEX), and <br /> methyl tertiary butyl ether (MtBE) by EPA Method 8260. <br /> Surveying <br /> Upon completion of well construction a licensed surveyor will locate the wells within the <br /> California state plane coordinate system, within 1/1000 vertical control, and latitude- <br /> longitude (degree, minutes, seconds) to meet the State of California Water Resources <br /> Control Board location requirements. <br /> REPORT <br /> Following the completion of fieldwork, a summary report will be prepared. <br /> SCHEDULE <br /> Following approval of this Work Plan, SECOR is prepared to initiate field work during March <br /> and April of 2005. <br /> I:\Chevron\94275\REPORTS\2005\Work Plan for Well destruction&USTRemoval-2005.doc <br />