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j !\ ED No G.BRDwt,JR. <br /> s DOv_RNoF <br /> ovn <br /> C 6 l 1 C D R N 1 A ����IIII S GRE'ER ROODRIOUE: <br /> WaterBoards � FNVIR7NMFNTAI PPOTF TInA <br /> Central Dalley Regional Water Quality Control Board <br /> 2 May 2013 <br /> Mr. Donald Rodgers <br /> 11900 South Union Rd. <br /> Manteca, CA 95336 <br /> DOCUMENT REVIEW, THE TRANSMISSION STORE, 515 WEST CHARTER WAY, <br /> STOCKTON, SAN JOAQUIN COUNTY(REGIONAL BOARD CASE#390891) <br /> 1 reviewed the Remedial Well Installation Work Plan (Workplan), received 30 April 2013 from <br /> your consultant Advanced GeoEnvironmental Inc. (AGE). The Workplan was written in <br /> response to my 11 April 2013 letter (Letter) that requested the Workplan for the two additional <br /> air sparge wells (SP-6A and SP-7A) in the plume core to the south of the existing AS system as <br /> previously recommended in the 9 April 2013 AGE email, and also requested: <br /> • The new AS wells installation and plumbing into the AS system by 30 June 2013, <br /> • Continued air sparging in the interim (The Letter stopped soil vapor extraction), <br /> • Submittal of a remediation status report with recommendations as necessary in the <br /> semi-annual groundwater monitoring report due 30 July 2013, and <br /> • Monthly email status reports received by the 15th of each month (May 15th, June 15th, etc.) <br /> on the progress towards modifying the AS treatment system until further notice. <br /> The two 2" diameter polyvinyl chloride (PVC) wells will be screened from 43' below ground <br /> surface (bgs) to 45' bgs, and connected by 1" PVC pipe to the existing AS system air <br /> compressor. The Workplan also compared AS versus In-Situ Chemical Oxidation and/or Batch <br /> Groundwater Extraction in a feasibility study, which concluded installation of SP-6A and SP-7A <br /> as the most cost effective method to address the area of significant groundwater contamination. <br /> The Workplan is approved, and is necessary and appropriate to optimize the AS system. <br /> Please contact me at least three working days prior to start of the fieldwork. If you have any <br /> questions, you may call me at (916) 464-4615 or email me at ibarton a(D.waterboards.ca.gov. <br /> James L. L. Barton, P.G. <br /> Engineering Geologist <br /> cc: Nuel Henderson, San Joaquin County Environmental Health Department, Stockton <br /> William Little, Advanced GeoEnviron mental Inc., 837 Shaw Rd., Stockton 95215 <br /> KARL E. LONGLEY Sc D, P.E,.CHAIR I PAMELA C. CREEDON P.E.. BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive:1200,Rancho Cordova,CA 45670 1 www.waterboarde.ca.gov/centralvalley <br /> Coo nECY—o rnrcn <br />