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i C A M B R I A Well MW-11 will be used to monitor shallow/groundwater north of the site (McDonald's property). Wells MW-12-50, MW-13-50, MW-14-50, MW-15-50,MW-16-50, and MW-17-50 will be used to monitor groundwater at the 45 to 50 depth interval at the locations shown on Figure 2. Wells MW-12-77, MW-13-77, MW-14-77, MW-15-77, and MW-16-77 will be used to monitor groundwater at the 65 to 77 depth interval at the locations shown on Figure 2. Monitoring well MW-16-90 will be used to monitor groundwater at approximately 90 feet below grade (fbg). Boring CPT-18 will be drilled to an approximate depth of 100 fbg at the location �' ( g) g PP P _ g shown on Figure 2. �-- The horizontal and vertical extent of impacted soil has been previously defined except upgradient of the site, therefore and as approved of by the SJCEHD, only soil sales from boring.CPT-18 will be submitted for chemical analOf 4e_ ysis. 1c. A Cambria geologist will supervise the drilling activities. Soils encountered in the well borings T will be described using the Unified Soil Classification System and Munsell Soil Color Charts. r- The CPT boring will be logged using CPT logging equipment. Soil samples will be collected from the well borings for soil description at five-foot intervals P g until 10 feet above the target screen interval (e.g., 35 fbg for the 45 to 50 fbg screen interval borings). At this depth we will perform continuous soil sampling to verify the soil types to determine the appropriate screen depths and intervals as discussed in the SJCEHD August 9,-- 2006 letter to Shell. Please note that for the wells proposed at the s e locations,but at different depths (e.g.,45 fbg and 65 fbg), soil logging at depths already login the shallow borings will not be logged again in the adjacent deeper borings. Soil samples will be screened in the field for organic vapors using a photo-ionization detector(PID). Exploratory boring logs will be prepared QpSS for the well borings. PID measurements will be rec ro ded on the boring logs. The wells will be completed using 2-inch diameter Schedule 40 PVC casing except fo�well MW-16-45 which will be completed using 4-inch diameter Schedule 40 PVC casing. The screened sections will be composed of 0.020-inch slotted PVC. The well screen interval in boring MW-11 will be approximately five feet above and 10 feet below first encountered groundwater. The.screen intervals in the remaining borings will be approximately five to ten feet in length at the approximate depths detailed above. The sand pack will consist of Lonestar #2/12 sand(or equivalent)and will be placed along the entire length of the screen interval to two feet above the top of the well screen followed by a two-foot thick bentonite seal and cement grout to grade. Actual well construction details will be based on soil types encountered and field 0778 3 it