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S ECOR 76 Service Station#11195 April 5, 2004 Page 4 a site-specific Health and Safety Plan (HASP). Field staff and contractors will review the HASP before beginning field operations at the site. • Permitting. The applicable permits for monitoring well installation will be obtained from San Joaquin County prior to beginning work. • Groundwater Monitor Well Reinstallaton. Damaged groundwater monitoring well MW-13 will be over-drilled using 10-inch hollow stem auger to a depth of 21 feet below ground surface (bgs). The boring log for the original installation of well MW- 13 is included as Attachment A. Reinstallation of well MW-13 will be completed in the borehole generated during the over-drilling process. Groundwater monitoring well MW-13 will be constructed of 2-inch diameter schedule 40 PVC pipe and will be screened from 6 to 21 feet bgs. Well MW-13 will be completed above grade with a stove pipe finish. • Soil Selection and Analysis. No soil samples will be collected during the reinstallation of well MW-13. • Monitor Well Development, Sampling, and Analysis. Following installation, monitoring well MW-13 will be developed by rigorously surging the well over the length of the screen interval and by purging approximately 10 casing volumes of water. Well MW-13 will then be sampled during the next quarterly monitoring and ='} sampling event. • Soil and Water Disposal. Soil cuttings generated during drilling operations will be stored in DOT-approved 55-gallon drums. Water generated during equipment cleaning will be temporarily stored in DOT-approved 55-gallon drums pending transport by a licensed disposal contractor to an appropriate disposal or treatment facility. Soil cuttings and purge water drums will be temporarily stored onsite pending transportation and disposal. • Well Surveying. Upon completion of well construction, the wells will be surveyed by a California-licensed surveyor to a local benchmark relative to mean sea level. Groundwater gradient data will be interpreted utilizing the top of well casing elevations and depth-to-water measurements. • Report. A letter report will be prepared after completion of necessary fieldwork. The report will include the boring log and waste disposal manifests. Field Procedures are included as Attachment B. SCHEDULE SECOR is prepared to initiate well installation activities in approximately 3-6 weeks following approval of this work plan and the procurement of permits. Upon completion of all necessary fieldwork, SECOR will prepare a report documenting reinstallation of the well. lAConocoPhillips1111951Work Plan For Reinstallation Of MW-13.Doc