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' 10 August 1999 AGE-NC Project No 97-0333 ' Page 7 of 9 logs Upon soil sample retrieval,the middle brass sleeve will be removed from the sampler The ends of the brass sleeve will be immediately covered with Teflon or aluminum sheets, sealed with plastic end caps, secured with tape and immediately placed in a chilled container for transportation to a ' state-certified laboratory Each sample sleeve will be labeled with the boring location, sample depth, sample time, sampling date and sampler's initials ' During sampling activities, sample duplicates will be monitored for the presence of organic vapor using a photo-ionization detector (PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene) and described on boring logs using the Unified Soil Classification System (USCS) All sampling tools and brass sleeves used for sample collection will be thoroughly rinsed with clean water after washing with a solution of Alconox All hollow stem augers will be steam-cleaned prior ' to advancement in each borehole 42 WELL COMPLETION �. One soil boring will be single-completed as a SVE well utilizing one 2-inch diameter Schedule 40 PVC 0 010 inch slotted v�cll scrccn and blank well casing A second soil boring will be dual- completed as a SVE well and an AS well utilizing t"o 2-inch diameter Schedule 40 PVC 0010-inch slotted well screens and blank v,ell casings Based on geologic/hydrogeologic conditions, a 12-foot length of well screen is anticipated for installation of SVE «ells and a 5-foot length of well screen is planned for installation of the AS cell It is anticipated that the bottom of the AS screen interval will be placed 10 feet below the water table and the bottom of the SVE \Aells placed 2 feet below the water table The proposed single-competed -v\ell construction diagrams is depicted in Figure 3, the proposed dual-completed well construction diagram is depicted in Figure 4 After installing the casing, filter pack material consisting of pre-washed 42/12 Lonestar sand will be added from the bottom of the borehole to approximately two feet above the screened interval Following placement of the filter pack the v,ell v4ill be surged to assist in settling the filter pack Additional sand will be added if settling occurs A nominal two-foot bentonite seal (bentonite chips) will be placed above the filter pack to minimize the potential for grout penetration into the screened section of the well The bentonite seal �Nill be formed by pouring bentonite chips into the annulus and allowing them to settle on the filter pack Bentonite chips will be hydrated using approximately five gallons of tap water The bentonite chips will be allowed to hydrate for a minimum of one-half hour prior to grouting ' The remaining annular space v�ill be filled to the round surface with a cement rout The grout . g P g g g u� ' mixture will consist of Type IIII portland heat cement and not moie than 6 gallons of Aater per 94- 4di anced GeoFm ironmenta 1 In,