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C.LEARWAr R <br /> G R O U P, I N C. <br /> organic vaporusing a calibrated photoionization detector.. The results of the <br /> field testing will be noted with the,lithologic descriptions on field exploratory <br /> soil boring log. Soil samples:selected for laboratory analysis 'Will be covered <br /> on both ends with teflon tape-.and plastic en,ld caps. The samples will then be <br /> labeled,- documented on a chain-of-custody.form and placed in. a cooler for <br /> transport to a state certified analytical laboratory. <br /> Drill.=soil. cuttings will be. stockpiled on-plastic and covered to'control runoff , <br /> or placed in, 55 gallon D.O.T. drums.,on site sampled for landfill profiling <br /> purposes and hauled by a licensed hazardous waste.hauler,to an appropriate <br /> landfill. All waste stored on site will be clear IT labeled. <br /> J. <br /> Well Installation <br /> Soil borings not to be converted into ni.oni�ormg wells will be sealed to the' ' <br /> ground surface using either neat cement or a cement/bentonite grout mixture <br /> . in accordance with federal, state and local regulations. <br /> Soil borings that will be converted into monitoring wells will be a minimum' <br /> t . of eight inches in .diameter for 2-inch diameter wells and a minimum of ten <br /> inches in diameter for 4-inch diameter- wells. Monitoring- wells- will be <br /> constructed with schedule 40, threaded polyvinylchloride (PVC) casing and <br /> have factory-slotted screen. The screened interval will be placed. such that it <br /> will extend approximately ten feet into the water bearing zone, and at least <br /> two feet above the-expected water level. Screen slot size and sand pack will be . <br /> i chosen based upon the expected aquifer materials. A graded sand pack will be <br /> placed in the annular space across. the screened interval and extended <br /> approximately one to three feet above the screen. A'minimum of a one foot <br /> seal of bentonite will placed above the sand pack. The bentonite seal will be <br /> hydrated by either formation water or distilled water. Neat cement or a _ <br /> cement/bentonite- grout mixture .seals the remaining annular space to the - <br /> surface. If bentonite is used in the grout mixture, it will not exceed 5°1° by <br /> weight. A.watertight locking cap and protective traffic-rated vault box will be <br /> installed on top of each well. All - well materials will be free from <br /> ` contamination prior to. installation. Complete well construction details will <br /> be presented on the field exploratory soil boring log, Fluids.or lubrications <br /> will not be used during the connection of individual lengths of screen and <br /> solid casing, other than distilled water. <br /> CLEARWATER GROUP,INC. 2 Apr.0 2$, 1995 <br />