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15 November 2000 <br /> . AGE-NC Project No 95-0142 <br /> Page 8 of'9 - <br /> then be immediately placed in a chilled container for transportation under chain of custody to a state- <br /> certified laboratory Each sample sleeve will be labeled with the boring location, sample depth, <br /> sample time, sampling date and sampler's initials <br /> Duplicate samples will be monitored for the presence of organic vapor using a photo-ionization <br /> detector(PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene) and will be visually <br /> described on boring logs using the Unified Soil Classification System (USCS) <br /> All sampling tools and brass sleeves used for-sample collection will be thoroughly rinsed with clean <br /> water after wa$hing with a solution of Alconox All hollow stem augers will be steam-cleaned priori <br /> to advancement of each borehole <br /> s , <br /> 43 WELL COMPLETION <br /> The final 15-inch diameter pilot borings will be single-completed as a ground water extraction well <br /> utilizing 6-inch diameter schedule 40 polyvinylchloride (PVC) 0 020-inch slotted well screen and <br /> blank well casing A 30-foot length of well screen is anticipated for installation of the monitoring <br /> well from 30 feet to 60 feet bsg A proposed monitoring well construction diagram is depicted to <br /> Figure 3 11 <br /> After installing the well casing in each pilot boring, a filter pack material consisting of even <br /> proportions of pre-washed#2112 Lonestar sand and 318" gravel (large sand) will be added through <br /> the augers over the screen interval to approximately two feet above the screened interval Following <br /> placement of the filter,pack, the well will be surged to assist settling the filter pack Additional filter <br /> pack will be added if settling occurs <br /> h <br /> A nominal two-foot bentonite seal (pell plug-coded bentonite pellets) will be placed above the filter <br /> pack to minimize the potential for grout penetration into the screened section of the well The <br /> bentonite seal will be formed by pouring bentonite pellets into the annular space between the well <br /> casing and the boring wall and allowing,them to settle on the filter pack The bentonite pellets will <br /> be allowed to hydrate for a minimum of one-half hour prior to grouting <br /> The remaining annular space will be filled to within one foot of the ground surface with a cement <br /> grout The grout mixture will consist of Type 1/1I portland neat cement and not more than 6 gallons <br /> of water per 94-pound sack of cement The grout will be placed by pumping through tremmie pipe, <br /> A grouting inspection will be scheduled with PHS-EHD personnel <br /> Advrrrrced CeoEnvaronmental,Inc <br /> a <br />