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10 August 1999 . AGE,-NC Protect No 97-0333 Page 7 of 9 logs Upon soil sample retneval,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 unmediately 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 nnsed 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 singlc-completed as a SVE well uulizirig one 2-Inch diameter Schedule 40 PVC 0 010-inch slotted well screen and blank well casing A second soil boring will be dual- completed as a SVE well and an AS well utilizing two 2-inch diameter Schedule 40 PVC 0 010-inch slotted well screens and blank well casings Based on geologic/hydrogeologic conditions, a 12-foot length of well screen is anticipated for installation of SVE wells and a 5-font length of well screen is planned for installation of the AS well It is anticipated that the bottom of the AS screen interval will be placed 10 feet below the water table diad the bottom of the SVE wells placed 2 feet below the water table The proposed single-competed well construction,diagrams is depicted in Figure 3,the proposed dual-completed well construction diagram is depicted in Figure 4 After installing the well casing, filter pack material consisting of pre-washed#12/12 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 well will be surged to assist Hi settling the filter pack Additional sand will be added if settling occurs A nornmal 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 will 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 prim to grouting The remaining annular space -ill be filled to the ground surface with a cement grout The grout rriixture mill consist of Type 1111 portland neat cement and not more than 6 gallons of water per 94- A0vancrd GeoEavjronmentaf Inc