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19 July 2005 AGE-NC Project No. 95-0135 Page 7 of 9 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 PID 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 w of the constituents listed in Section 3.2. 4.2. WELL COMPLETION AND WELL ELEVATION SURVEY The seven pilot soil borings will be completed as ground water monitoring wells utilizing 2-inch diameter,Schedule 40 PVC blank well casing and 0.020-inch slotted well screen.The 45 foot boring will be screened from 25 feet to 45 feet bsg; the 65 foot borings will be screened from 60 feet to 1 65 feet bsg; and the 120 foot borings will be screened from 110 feet to 120 feet bsg.After installing the well casing in each pilot boring,a filter pack material consisting of pre-washed#3 Lonestar sand will be added through the augers from total depth to at least 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, and up to 5-foot bentonite seal for the 120 foot borings; will be placed above the filter pack to minimize the potential for grout penetration into the screened t section of the wells. The bentonite seal will be formed by pouring bentonite chips into the annulus L„ and allowing them to settle on the filter pack. The bentonite pellets will be allowed to hydrate for a minimum of a half hour prior to grouting. i.. 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 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.Proposed monitoring well construction diagrams are depicted on Figures 3,4 and 5. Following completion of the monitoring wells, well elevations and locations will be surveyed by a California-licensed surveyor relative to a City of Stockton elevation benchmark. 4.3. WELL DEVELOPMENT Development of the proposed wells will consist of a combination of bailing with a stainless steel �'' Advanced GeoEnvironmental,Inc.