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22 September 2009 <br /> AGE-NC Project No. 09-1692 <br /> Page 9 of 11 <br /> Disposal alternatives will be evaluated based on results of soil and water analysis. <br /> 5.2. SOIL SAMPLE COLLECTION AND ANALYSIS <br /> Relatively undisturbed soil samples will be collected from each boring at 5-foot intervals with a <br /> California modified split-spoon sampler fitted with three 2-inch diameter,6-inch long stainless steel <br /> sleeves. Upon removal from the sampler, the sample sleeves will be separated. The exposed ends <br /> of one of the sleeves will be covered with Teflon sheets,capped and sealed with tape.The soil in the <br /> remaining sleeves will be visually classified by an AGE staff scientist in accordance with the Unified <br /> Soil Classification System (USCS), and field screened for the presence of volatile organic <br /> compounds using an organic vapor meter(OVM)equipped with a photo ionization detector(PID). <br /> Soil sample descriptions and OVM readings will be recorded on a log for each boring. <br /> Following sample collection,each preserved sample sleeve will be labeled with the boring location, <br /> depth,time, date and sampler's initials.Appropriately sealed and labeled samples will be placed in <br /> a chilled container under ice and transported under chain-of-custody procedure to a CDPH-certified <br /> laboratory for analysis. <br /> 5.3. WELL COMPLETION <br /> The 8.25-inch diameter pilot borings will be single-completed as a ground water monitoring wells <br /> utilizing 2-inch diameter schedule 40 polyvinylchloride (PVC) 0.020-inch slotted well screen and <br /> blank well casing. A 20-foot length of well screen is anticipated for installation of the monitoring <br /> well. A proposed monitoring well construction diagram is depicted in Figure 4. <br /> After installing the well casing in each pilot boring, a filter pack material consisting of pre-washed <br /> #2/12 Lonestar sand will be added through the augers over the screen interval to approximately two <br /> feet above the screened interval. Following placement of the filter pack, the well will be surged to <br /> assist in settling the filter pack. Additional sand will be added if settling occurs. <br /> A nominal two-foot bentonite seal will be placed above the filter pack to minimize the potential for <br /> grout penetration into the screened section of the well.The bentonite seal will be formed by pouring <br /> bentonite chips into the annulus and allowing them to settle on the filter pack. The bentonite chips <br /> will be allowed to hydrate for a minimum of one-half hour prior to grouting. <br /> The remaining annular space will be filled within one foot of the ground surface with a cement grout. <br /> The grout mixture will consist of Type III portland neat cement and not more than 6 gallons of water <br /> per 94-pound sack of cement. A grouting inspection will be scheduled with EHD personnel. <br /> Advanced GeoEnvironmental,Inc. <br />