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CLEARWATER <br /> G R O U P, I N C. <br /> organic vapor using a calibrated hotoionization detector. The results of the <br /> P g P <br /> field testing will be noted with the lithologic descriptions on field exploratory <br /> I soil boring log. Soil samples selected for laboratory analysis will be covered <br /> on both ends with teflon tape and plastic end caps. The samples will then be <br /> labeled, documented on a chain-of-custody form and placed in a cooler for <br /> Itransport 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 clearly labeled. <br />' Well Installation <br /> Soil borings not to be converted into monitoring 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 /> 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 /> I two feet above the expected water level. Screen slot size and sand pack will be <br /> 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 /> I 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% 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 /> I will not be used during the connection of individual lengths of screen and <br /> solid casing, other than distilled water. <br /> I <br /> CLEARWATER GROUP,INC. 2 June 2,1995 <br />