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J : 06 March 2007 AGE-NC-Project No. 45=0185 Page 7 of 9 inthetwof remainm sleeves - _ - s ee es will lie`visuall classified b .AGEpersonnel'in accordance g Y - , ` Unified Soil Classification System (USCS)'and'field-screened for the'presence of volatile organicam compounds using an organic-vapor_meter(OVM).equipped with a photo-ionization detector'(PID ry `.. .-Thermo Environmental<SSO, 10 0eU jor equivalent], calibrated to sobutylene) + 71 l - 3:2. WELL INSTALLATION Following advancement of each pilot boring to total depth;the well casing, filtei pack grid sealing ;- .. materials will be placed into the borehole through the iriterior'of the hollow-stem augers•,A 2-in6; v i :?.-----diameter,.Schedule 40 PVC casing wrth a.l'S-.foot 0:020-inch slotted'wellscreen will be installed in _ -'the monitoring well borehole (Figure 4).and a 2-iach drarrietex, Schedill.'6 40 PVC casing with a 5-foot 0.020-inch slotted well screen,will be installed iri the MW=.7 borehole , z -'After installing the well casing,filter.pack material consisting ofpre-washed 43 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 settling the filter pack:Additional sand { will be added if settling occurs. A.nominal.bentonite'seal will h&placed above.the filter pack;to miniMMize the potential for grout.. y. ' ~penetration'into the screened'sectioii.of the w ;T ell. he beritoriite, seal will be forme&by pouring _- bentonite.chips-into the annular'-`space between the hollow-stem augers and the well casing and.. ailowing fhem to settle-on the filter-pack.'Bentonite chips _will'be hydrated using-five gallons of - -water.The bentonite chips will be allowed to hydrate fora minimum of 20 rninutes.prior to grouting :. r' :The remaining annular space above the benton: iie:seal will beTfilled to_wrthin.6ne foot of the ground { . µ surface with a cement grout. The.grout rriixture-will consist of Type-I/Wpoitlan&neat cement an not more than 6 gallons of water per 94:pound sack of cement.The_grout will be placed'by pumping' z,. . through tremtnie pipe.-The EHD will,be notified for grout;=inspection atrleast 72 hours prior to Jt conducting groutingprocedures.A:traffic-rated�we11 box will-then-be installed-overtlie-well casing - ` - _ 3.-3.. DIRECTYUSH BORINGS_AND SOIL:SAMPLING ' ` ` Four direct-push soil borings will--be advanced;.three off site to first encountered ground water;_. estimated to be at approximately 23 to 25_feet bsg; and one-on-site ta-approximately 40;to 50-feet. bsg, using a van-mounted.` direct=push Geoprobe=5400 rig equipped with a hydraulic hammer;the hammer is tiled to drive a-1:50-iiich diameter_soil sampler;attached ao 5,-foot long1.1.25=inch ' . -diameter;probe rods;into the.substfHafee in intervals 6f.5 feet-Soil samples will be-collected from ' : 'each borehole at each five=foot inter als,.beginning at'five feet bsg._ - 'A' R_`AdvancedGeoEavironroental .� 'mss-._ `.. 2 - - •� i ?r �