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f �y 15 November 2005 AGE-NC Project No 04-1239 Page 4 of 5 s will be collected from each soil boring at 5-foot intervals using a California modified split-spoon sampler fitted with 2-inch diameter, 6-inch long brass sleeves Upon removal from the sampler,the sample sleeves will be separated with a knife The exposed ends of the second sleeve will be covered with Teflon sheets, capped, and sealed with tape Soils sampled in the borings will be visually classified by an AGE geologist in accordance with the Unified Soil Classification System (USCS) Additionally, soil samples will be field screened for the presence of volatile organic compounds using an organic vapor meter(OVM),equipped with a photo-ionization detector(PID) Soil sample descriptions and OVM readings will be recorded on a log for each boring Following sample collection, each preserved sample sleeve will be labeled with the boring location, depth,time, date,and sampler's initials Appropriately sealed and labeled samples will be placed in a chilled container and transported under chain of custody to a DHS-certified laboratory for analysis for the constituents listed in Section 2 2 3 2 WELL COMPLETION AND ELEVATION SURVEY The pilot soil borings will be completed as ground water monitoring wells utilizing 2-inch diameter, Schedule 40 PVC blank well casing and 0 010-inch slotted well screen installed from 20 feet to 40 feet bsg in the two shallow wells and from approximately 55 feet to 65 feet bsg or from 60 feet to 60 feet bsg if required to isolate a coarse grained stratigraphy, in the two deep wells Proposed monitoring well construction diagrams are depicted on Figures 3 and 4 After installing the well casing in each pilot boring, a filter pack material consisting of pre-washed #2112 Lonestar sand will be added through the augers from total depth to approximately 2 feet above the screened interval Following placement of the filter pack, the well will be surged to assist in settling the filter pack Additional sand will be added if settling occurs A nominal 2-foot bentonite chip seal will be placed above the filter pack to minimize the potential for grout penetration into the screened section of the wells The bentonite seal will be formed by pouring bentonite chips into the annulus and allowing them to settle on the filter pack The bentonite -pellets will be allowed to hydrate for a minimum of one-half hour prior to grouting The remaining annular space will be filled to within 1 foot of the ground surface with a cement grout The grout mixture will consist of Type I/II portland neat cement and not more than 6 gallons of water per 94-pound sack of cement The grout will be placed by pumping through a tremie pipe A grouting inspection will be scheduled with EHD personnel Following completion of the monitoring wells, well elevations and locations will be surveyed by a ipCalifornia-licensed surveyor relative to a City of Stockton elevation benchmark Advanced GeoEnvironmental,Inc