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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN C OUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Bergman,R.E.H.S. <br /> ` { Director 304 East Weber Avenue, Third Floor Mike l-luggins,R.E.H.S.,R.D.I. <br /> • Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • C.., - \P Program Manager - Tele hone: (209) 468-3420 Margaret Lagorio,R.E.]-].S. <br /> �rFop� Laurie A.Cotulla,R.E.H.S. Roben McClellon,R.E.H.S. <br /> Program Manager FaX: (209) 464-0138 Mark Barcellos,R.E.H.S" <br /> ARTHUR L WYATT JR <br /> 6265 CROOKED STICK <br /> STOCKTON CA 95219 <br /> RE: FORMER ARCO AM/I'M SITE CODE: 1216 <br /> 4511 PACIFIC AVENUE <br /> STOCKTON CA <br /> I <br /> WORKPLAN: Remedial Action Work Plan—Addendum DATED:November 9 2004 <br /> PREPARED BY: Advanced GeoEnvironmental Inc. AGE { <br /> APPROVED <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S <br /> 25296.10(c)(3)): <br /> 1. . Install a low-flow pump in extraction well E`W-1 to match the drop in groundwater level to <br /> facilitate groundwater extraction in both EW-1 and EW-2. <br /> 2. Replace the process pump to accommodate increase discharge volumes in anticipation of <br /> groundwater extraction from both wells EW-1 and EW-2. <br /> COMMENTS AND CONDITIONS: <br /> 1. Implement work by December 1,2004. <br /> 2. Adjust the pumping rate to optimize contaminant mass removal without excessive <br /> extraction of non-impacted groundwater,and minimize pumping influence on the <br /> groundwater contamination plume south of the property(Pacific Car Wash at 4405 Pacific <br /> Avenue). Additional samplings of influent�� for bothmatEremoval and establishing W-1 and EW-2 may be required <br /> in order to ascertain the pumping rate best <br /> hydraulic control of the contamination plume. r <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN (H&S 25296.10(C)(3)): <br /> None <br /> DATED November 9 2004 BY <br /> Cc: CRWQCB,Central Valley Region—James L. L.Barton,RG <br /> Fax: Advanced GeoEnvironmental,Inc. —Bill Little <br /> I <br /> I <br /> 1 <br />