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li <br /> 1 [ <br /> + 1 <br /> 1 1 <br /> 12 February 200, 2 <br /> 6 <br /> AGE-NC Project No 97-0312 <br /> Page 11 of 18 s <br /> With Teflon sheets, capped and sealed with tape Soils encountered in the borings will be visually <br /> I classified by an AGE geologist in accordance with the Unified Soil Classification System(USCS) <br /> Ii <br /> Additionally, soil samples will be field-screened for the presence of volatile organic compounds ^7 <br /> using an OVM <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 t <br /> a chilled container under ice and transported under chain-of-custody procedure to a DHS-certified <br /> laboratory <br /> 44 WELL INSTALLATION " <br /> One cluster-type ground water monitoring well, one ground water extraction well, four SVE wells <br /> and three ozone sparge wells will be installed at the site as part of assessment and feasibility <br /> activities <br /> 4 4 1 Monitoring Well Installation <br /> Following advancment of the pilot boring,2-inch diameter Schedule 40 PVC 0 010-inch slotted well ' <br /> screen and casing will be installed As directed by the EHD, a 5-foot section of well screen will be <br /> utilized for'the shallow well, from approximately 60 feet bsg to 65 feet bsg A 5-foot section of well <br /> screen also will be utilized for the deep well,from approximately 85 feet bsg to 90 feet bsg The well <br /> materials will be placed into the borehole through the interior of the hollow-stem'augers After <br /> installing the well casing, filter pack material consisting of pre-washed#2112 Lonestar sand will be E <br /> 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 /> 1 , <br /> A nominal four-foot thick bentonite seal will be placed above the filter pack 'to minimize,the <br /> potential of grout penetration into the filter pack or screened section of the well The bentonite seal <br /> will be formed by pounng bentonite chips into the annulus and allowing them to settle on the filter <br /> pack Bentonite chips will be hydrated using five gallons of water' The bentonite chips will be <br /> allowed to hydrate for a minimum of one-half hour prior to grouting <br /> I r ' <br /> The remaming'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 I/II 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 a tremmie pipe <br /> 1 <br /> Advanced GeoEnvi ron mental,Inc <br />