Laserfiche WebLink
08 August 2001 <br /> AGE-NC Protect No 99-0657 <br /> Page 8 of 10 <br /> from a height of 30 inches (blow counts) The blow counts will be recorded on boring logs Upon <br /> soil sample retrieval, a selected brass sleeve will be removed from the sampler The ends of the brass <br /> sleeve will be immediately covered with Teflon or aluminum sheets, sealed with plastic end caps, <br /> secured with tape and Immediately placed In a chilled container for transportation under chain of <br /> custody to a state-certified laboratory Each sample sleeve will be labeled with the boring location, <br /> sample depth, sample time, sampling date and sampler's Initials <br /> During sampling activities, sample duplicates will be monitored for the presence of organic vapor <br /> using a photo-ionization detector (PID Thermo Environmental 580A, 10 0 eV, calibrated to <br /> isobutylene) and will be visually described on boring logs using the Unified Soil Classification <br /> System(USCS) <br /> 4 4 WELL COMPLETION <br /> Soil borings will be single-completed as ground water monitoring wells utilizing 2-inch diameter <br /> schedule 40 polyvmylcblonde(PVC) 0 020-Inch slotted well screen and blank well casing A 20--foot <br /> length of well screen is anticipated for installation of monitoring wells However, based on <br /> geologic/hydrogeologic conditions the screen length and placement maybe modified with PHS-EHD <br /> approval The bottom of the screen interval will be placed 15 feet below the water table A proposed <br /> well construction diagram is depicted in Figure 8 <br /> After installing the well casing, filter pack material consisting of pie-washed #2 Lonestar sand will <br /> be added from the bottom of the borehole to approximately two feet above the screened interval <br /> Following placement of the filter pack, the well will be surged to assist in settling the filter pack <br /> Additional sand will be added if settling occurs <br /> A nominal two-foot bentonite seal (bentonite chips) will be placed above the filter pack to minimize <br /> the potential for grout penetration into the screened section of the well The bentonite seal will be <br /> formed by pouring bentonite chips into the annulus and allowing them to settle on the filter pack <br /> Bentonite chips will be hydrated using approximately five gallons of tap water The bentonite chips <br /> will be allowed to hydrate for a mmirnum of one-half hour prior to grouting <br /> The remaining annular space will be filled to the ground surface with a cement grout The grout <br /> mixture will consist of Type I/II portland neat cement and not more than 6 gallons of water per <br /> 94-pound sack of cement The grout will be placed by pumping through trerme pipe A grouting <br /> inspection will be scheduled with PHS-EHD personnel <br /> Advanced GeoEnvironmental,Inc <br />