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1 <br /> 11/09/2004 16:18 2094671}18 AGE STOCKTON PAGE 02/02 <br /> Advanced <br /> Geo Environmental, Inc. <br /> 09 November 2004 <br /> AGE-NC Project No_ 95-0128 <br /> Mr..Jeff Wong <br /> 'San Joaquin County.Environmental Health Department <br /> 304 E. Weber Avenue, Third floor <br /> Stockton, California 95202 <br /> Subicet: Remedial Action Work Plan -Addendum <br /> PACIFIC MINI MART <br /> 4511 Pacific Avenue, Stockton, California <br /> Dear Mr. Wong_ <br /> At the request of W,Art Wyatt,Advanced GeoEnvironmental,Inc. (AGE)has installed connection <br /> piping for the soil vapor extraction wells and attempted-to procure a permit for vapor discharge; <br /> additional ground water extraction well EW-2 was activated. <br /> • The feasibility of ground water recovery from ground water extraction well EW-I'has been <br /> greatly reduced over the past three years,due to a lowering of the ground water table within <br /> the well casing, and general overproduction of groundwater fronn the well 0.5 million <br /> gallons) which has possible fduled the.well casing screen inlets. AGE proposes to install a <br /> law-flow ground water pump; operated on pneumatic pressure (air), within well EW-1 to <br /> continue ground water recovery. This pump operates at rates of two to three gallons per <br /> minute, during operational cycles. Additionally;this well pump has far less down-tithe, or <br /> necessary ground water recovery within the well,prior to re-initiating a pumping operation <br /> when compared to an electrical motor driven pump. <br /> • With the addition-of.one ground water extraction well (EW-2), the.process pump on the <br /> ground water treatment system should be replaced to glow for higher discharge volumes and <br /> flow..Also the Cityof.Stockton discharge permit must be amended to increase the newhigher <br /> flow volumes; the permit should be anticipated at eight to ten gallons per minutc. Upon <br /> approval of the work plan addendum, AGE will install the recommended equipment and <br /> amend the discharge permit accordingly. <br /> Ifyou have any questions or"require further information.,please contact our office at(209)467-1006. <br /> Sincerely, <br /> Advanced GeoEn vironmental,Inc. <br /> William R. Little <br /> Senior Project Geologist <br /> cc: Mr. Art Wyatt <br /> 837 Shaw Road,Sro=ktoh,Cahfornia 95215 <br /> Telcphonc(209)467-]006 FAX(209)467-'1118 <br />