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I k _y <br /> L <br /> is — <br /> GEGTHASE <br /> ENVIRONMENTAL <br />! L <br /> Corrective Action Plan - Addendum <br /> Former Manna Pro Site <br /> 4004 S. EI Dorado <br /> Stockton, California <br />'f February 10,2009 <br /> Project No.207.3 <br />{ 1.0 INTRODUCTION <br /> 1.1 Current Site Status <br />{ On September 26,. 2003, Geo Phase Environmental, Inc. issuedr a document entitled <br /> Report Vapor Extraction /Air Sp, r e Remedial Sstem Construction. Former Manna <br /> Pro Site. . This report documented the construction and initial operation of the Soil Vapor <br /> Extraction / Air Sparge (SVE/AS) remedial system. This system consists of 11 soil vapor <br /> k extraction wells and 7 air: sparge wells and the associated surface equipment and pipe <br /> runs. <br /> 4 The system operation has been successful in removing much of the released gasoline, but <br /> as time has gone on, the rate of contaminant mass removal has decreased to the point <br /> where it is less than two pounds per day. Concurrently, routine groundwater monitoring <br /> data.indicate that the area in the immediate vicinity-of Monitoring Well, MW-1, has been <br /> the slowest to respond to the remedial system and maintains the largest share of the <br /> residual contamination. In an attempt to increase the rate of vapor extraction in this area, <br /> we are proposing to.construct two new service wells: a vapor extractor and a sparge well. <br /> These wells will be tied into the existing surface equipment. <br /> 1.2 = Proposed Changes to Scope of Work <br /> 1. In order to increase the rate of contaminant mass removal in the immediate <br /> vicinity of MW-1, two new service wells will be constructed. One new airs e ar sparge <br /> well and one new soil vapor extraction well will .be constructed in a manner <br /> similar.to that described in the original CAP. <br /> 2937 Ven eman Ave., 413240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br />