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ATC Associates Inc. <br /> Cvv <br /> 1117 Lone Palm Avenue, Suite 201 <br /> Modesto,California 95351 Atc <br /> 209-579-2221 <br /> ASSOCIATES I N C . Fax:209-579-2225 <br /> During operation of the SVE system between January 17, 2007 and February 13, 2009, the <br /> system operated for a total of 16,500 hours and successfully removed an estimated 5,436.76 <br /> pounds of total petroleum hydrocarbons as gasoline (TPHg), and an estimated 823.39 pounds <br /> of benzene, toluene, ethyl benzene, and total xylenes (BTEX) constituents or a total of estimate <br /> of 6,260.15 pounds of vapor phase hydrocarbons. Using an average density of gasoline of <br /> 6.25 pounds per gallon, this represents removal of the equivalent of approximately 1,000 <br /> gallons of gasoline. <br /> SCOPE OF WORK <br /> Planning and Permits <br /> ATC will obtain all necessary permits from the San Joaquin Environmental Health Department <br /> (SJCEHD) prior to conducting any well destruction activities at the site. ATC will schedule field <br /> personnel and equipment, notify Underground Services Alert to locate underground utilities as <br /> required, and perform other necessary field preparation and job start-up activities. The <br /> proposed work will be performed under the direction of a California Registered Professional <br /> Engineer or Geologist. <br /> Well Destruction Activities <br /> ATC will properly abandon groundwater monitoring wells MW1 through MW7 and vapor <br /> extraction wells VEW1 through VEW3. The locations of the groundwater monitoring and <br /> remediation well networks are shown on Figure 2. Prior to the abandonment, the well boxes, <br /> locking plugs, and top three feet of casing will be removed from each well. The groundwater <br /> monitoring wells and vapor extraction wells will be abandoned using pressure grouting <br /> methods, filling each well casing and filter pack with a neat cement grout slurry. Well <br /> construction logs are provided as Attachment 1. <br /> The wells to be destroyed by pressure grouting processes will be completed using a specialized <br /> pressure-grouting tool. The grout will be emplaced in the wells using tremmie pipe. <br /> For protection of the annular seal at the land surface, a 24-inch diameter hole will be dug out <br /> around the well box locations to a depth of approximately 36 inches. During the sealing <br /> operation, the grout used to fill the wells will be made to overflow into the excavation and fill it to <br /> a thickness of one foot and form a cap which has a diameter of at least 24 inches. <br /> After the sealing material has set, the excavations will be filled to within approximately 3 inches <br /> of surface grade with clean soil and the remaining 3 inches will be filled with asphalt patch or <br /> concrete to restore the appearance of the paved surfaces at the site. <br /> S:1Enviromentah62577-Diesel Pert1REP0RT8\WP-Well Abandonment 3 <br />