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CAMBRIA Mr Jeffrey Wong August 26, 2005 equipment and will be converted to groundwater monitoring wells If warranted, Cambria will install conductor casings to seal off shallow groundwater during construction of well MW-15 Well MW-12 will be located along the eastern property boundary between wells MW-6 and MW-7, well MW-13 is proposed south of MW-3, well MW-14 will be located along the southern property boundary between well MW-7 and proposed well MW-13, and MW-15 is proposed southeast and downgradient of the existing USTs Note that the location for proposed well MW-13 may be revised due to the presence of the aboveground propane tank and crash posts A Cambria geologist will supervise the drilling and describe encountered soils using the Unified Soil Classification System Cambna will collect soil samples from the borings at 5-foot intervals for soil description, possible chemical analyses, and organic vapor screening with a photo- ionization detector (PID) Cambria will continuously log soils from 90 to 100 fbg from well boring MW-15 Cambria will prepare a boring log for each well and will record PID measurements on the boring logs Cambria will submit soil samples collected at approximately 20 fbg, 30 fbg, 40 fbg, and at the capillary fringe for chemical analyses Soil samples designated for chemical analyses will be retained in stainless steel or brass sample tubes Cambria will cover the tubes on both ends with Teflon sheets and plastic end caps, label the soil samples, enter them onto a chain-of-custody record, and place them into a cooler with ice for transport to a State of California certified laboratory for analyses We will request a standard 2-week turn-around time for laboratory results Monitoring Well Installation Well borings MW-12, MW-13, and MW-14 will be drilled to approximately 10 feet below first-encountered groundwater, and well boring MW-15 will be drilled to approximately 100 fbg Based on the second quarter 2005 monitoring data, first- encountered groundwater is approximately 50 fbg Wells MW-12, MW-13, and MW-14 will be constructed using 4-inch-diameter Schedule 40 PVC casing, and well MW-15 will be constructed with 4-inch Schedule 80 PVC casing All wells will be constructed with a screen slot size of 0020-inch The well screen intervals in wells MW-12, MW-13, and MW-14 will be from approximately 5 feet above to 10 feet below first-encountered groundwater, and MW-15 will be screened from approximately 90 to 100 fbg The sandpack in each well will be placed from the bottom of the well screen up to 2 feet above the top of the well screen and followed by a 2-foot- thick bentonite seal and cement grout to grade Actual well construction details will be based on soil types and field conditions during drilling Each well will be secured with a locking cap under a traffic-rated well box 6