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CRYSTAL CREAM& BUTTER COMPANY <br /> WKA No 1628 07 <br /> June 5, 1996 <br /> Page 4 <br /> All drilling equipment will be steam cleaned between borings to reduce the potential for cross- <br /> contammation, rinse water generated dunng steam cleaning will be pumped into labeled 55-gallon <br /> drums and stored on site All soil cuttings generated during drilling will be placed on a stockpile <br /> to be located on site <br /> Dual Completion Air Sparging and Va or Extraction Well Installation <br /> One boring will be converted to a dual completion 2-inch-diameter air sparging well and a 4-inch- <br /> diameter vapor extraction well and the two other borings will be converted to dual completion 2- <br /> inch-diameter air sparging/vapot extraction observation wells The proposed wells will be <br /> installed and constructed based on site-specific geologic conditions The dual completion air <br /> sparging/vapor extraction wells will be installed to total depths of approximately 20 and 40 feet <br /> • below grade, respectively The screened interval of the vapor extraction well will extend from <br /> ` approximately 10 feet to 20 feet below grade and the screened interval of the air sparging well <br /> will extend from approximately 3 5 feet to 40 feet below grade <br /> Two borings will be converted to dual completion 2-inch-diameter air sparging/vapor extraction <br /> observation wells The dual completion air sparging/vapor extraction observation wells will be <br /> installed to total depths of approximately 20 and 30 feet below grade, respectively The screened <br /> interval of the air sparging observation wells will extend from approximately 20 to 30 feet below <br /> surface grade and the vapor extraction observation wells will extend from approximately 10 feet <br /> to 20 feet below grade <br /> The vapor extraction well will be constructed using Schedule 40, polyvinyl chloride (PVC) casing <br /> with 0 10-inch perforations, and sand as a filter pack The air sparging well and air <br /> sparging/vapor extraction observation wells will be constructed using Schedule 40 PVC casing <br /> with 0 02-inch perforations, and sand as a filter pack An approximately 2-foot-thick bentonite <br /> seal will be installed above the sand pack, and the remainder of the annulus will be sealed with <br /> • Portland Type I/II neat cement The top of each casing will be secured with watertight locking <br /> INK <br /> WALLACE-KUHL <br /> Recycled paper 6 ASSOCIATES INC <br />