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QI - 15 April 1999 • - AGE-NC Project No. 98-0520. _. G - Page 8 of 10, a chilled container under ice and transported under chain of custody'procedure to'a' DHS certified laboratory: •, _ {_ Soil cuttings generated during drilling of the soil borings will-be contained within plastic sheeting - on the site.for storage. Drums containing decontarnination.water will be.stored<on-site pending .. appropriate removal; disposal and/or" treatment. 4.2: __GRAB WATER SAMPLING PROCEDURES: For the collection of"grab"ground water samples, one soil boring will be advanced to the top of the I ground water table as identified by collection of a saturated soil-sample. Once groundwater has-been ` encountered, a disposable bailer will lowered through the hollow'center auger two.to`three feet.into the water bearing zone. Samples for BTEX;'TPH-g, and fuel oxygenate analyses will be-collected in laboratory-supplied, 40-m1 .VOA vials containing 0.5=zn1 .of hydrochloric acid as sample preservative. Samples may-be collected -for TPH-d`.analysis inaaboratory-supplied one-liter.glass containers. The labeled vials will be placed:in a chilled container.: riderice'and transported under i ` chain-of-custody to-a DHS-certified laboratory.:- } 4.3. MONITORING WELL INSTALLATION-PROCEDURES The monitoring well boring,will be completed using hollowstem auger-drilling techniques. Soil,-. borings will be advanced-using a truck'mounted drill rig equipped-with-.hollow-stern augers.-The ' { - " boring for monitoring wells be advanced.utilizing 8:-inch'augers. Proposed monitoring well design is illustrated in Figures 3%. Following completion of the_soil borings,A 2=inch diameter Schedule 401?VC 0-02 inch,slotted.well i screen and casing will be installed:- A 20-foot section of well 'screen will be installed from a depth' _ of approximately 10 feet to 30 feet bsg.-The-casing, filter,pack and well sealing materials will be placed into the borehole through the-interior-of the hollow-stem augers-_After installing the-wel11. casing, filter pack material consisting,of pre-washed`43 Lones6Y sand will tie added from the bottom =r of the borehole to approximately two feaabove-the screened interval. Following"placement of the Y filter pack,the well will be-surged to assist in settling the filter;pack. Adelit'ional sand will be added if settling occurs:A nominal_l-foot bentonite seal will be placed.above the filter pack:The-bentonite ' chips will be hydrated with five gailons_of potable water:'The bentonite chips will.be'allowed to _ --hydrate for a-minimum of dr e-half hour prior to grouting. The remaining annular spaces will be filled to the ground.surface with a-cement grout:The grout �- ` mixture will consist of Type_1/II portland•.neat cement-and not more than 10 gallons:of water per . <x' i:•, „ a. ,'.'7 - ; - 4 -.4dvt voce!/reef nvironmental,int., . -