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• Well Abandon <br /> Drilling Contractor Scope f Work <br /> AME Project No.16014.01 <br /> Revision 1,June 5,2002 <br /> Site Location,Description <br /> The well(RW-1) is located in the general vicinity of 75 West Valpico Road, Tracy, California <br /> 95376(former Georgia-Pacific Corporation Chemical Packaging Plant). See attached figures. <br /> Task <br /> Abandon one 8-inch diameter PVC recovery well to a depth of 80 feet following San Joaquin <br /> County Public Health Services Environmental Health Division Well Standards for the <br /> destruction of wells(enclosed). <br /> Target Date <br /> Early July 2002, depending upon receipt of well destruction permit from San Joaquin County <br /> Public Health Services Environmental Health Division. <br /> Abandonment Method for Recovery Well RW-1 <br /> Mechanical Perforation Method <br /> Perforation of the casing will be done from 64 to 72 feet below ground surface (bgs). A clay <br /> / aquitard approximately 2 feet thick is present from approximately 67 feet to 69 feet bgs in the <br /> formation. The perfmg interval will be four perfs per foot between 64 and 72 feet bgs. Upon <br /> completion of each perfmg interval, the perfmg tool will be rotated 90 degrees developing a <br /> spiral perforation pattern in the screened interval of the casing from 64 to 72 feet bgs. <br /> Grouting Procedures <br /> Upon completion of all perforations, the borehole will be grouted in one continuous operation <br /> using a gravity feed from the bottom of the well up to the surface using a tremie pipe. The grout <br /> will consist of either a 9 sack sand slurry or neat cement and be of sufficient quantity to backfill <br /> both the sand pack and casing to the top creating a mushroom like cap. <br /> Surface Excavation <br /> The well has a concrete-type well box and associated piping,both of which are to be removed. <br /> A hole at least one foot greater than the diameter of the originally drilled borehole will be <br /> excavated around the outside of the well casing to a depth of three to five feet bgs. <br /> The casing will be cut off six inches above the bottom of the excavation and removed. The grout <br /> used for filling the well will be allowed to spill over into the excavation to a minimum thickness <br /> of one foot,forming a mushroom like cap with a diameter at least one foot greater than the edge <br /> NIVU2 <br /> c.\wPa002 UR \02-157 sow.d« <br /> �AL#MIMOEFAff Sf <br /> U6s00, awm�e"0°R <br /> ftpw i Q v <br /> APP- . twOVW MftWGr <br /> 0 of WM* w.tt ws% r z <br /> Reetadat <br /> ov Ie nd�da so*bv*Wft &Moddg~ <br /> toereon and does not 8UVWtte or approve airy medMten or <br /> da-viatiion from requivements of state taws or 1McOt^ <br />