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Mr. Sheldon Heckman, c/o Ms. r�arna E. Herrigfeld - 2 - 19 August 2002 <br /> Herum Crabtree Brown, Stockton <br /> Comments: <br /> 1. We concur with the recommendation to continue monitoring groundwater on a quarterly basis. Please <br /> continue using the analytical suite presented in the Report, and work with the laboratory to achieve the <br /> method detection limits equal to the lowest water quality numerical limits for applicable constituents of <br /> petroleum fuel components presented in the attached memorandum(Attachment). <br /> 2. We do not concur with collecting one year of groundwater data prior to continuing the <br /> characterization of the 1,2-DCA groundwater plume. Further, in October 2001,we requested an <br /> additional investigation and established schedules for submittal of a Site Assessment Report (SAR) and <br /> a Corrective Action Plan(CAP). In February 2002, we concurred with the Revised Site Assessment and <br /> Remedial Feasibility Work Plan, which included: 1) a proposal to investigate soil vapor extraction <br /> (SVE) as a remedial option, and 2) a revised SAR and CAP submittal schedule. <br /> Regional Board staff visited the site to observe fieldwork(well installation) on 10 April 2002, and <br /> discussed the document submittal schedule with AGE. The SAR was due on 31 July 2002, and the CAP <br /> was due 15 August 2002. <br /> By 15 September 2002 provide a Site Assessment Report that includes the results of the April 2002 soil <br /> and groundwater investigation, the SVE feasibility study, and recommendations for the Corrective <br /> Action Plan. <br /> By 15 October 2002 provide a Corrective Action Plan. <br /> Both the Site Assessment Report and the Corrective Action Plan should be prepared in accordance with <br /> the outlines attached to our 1 October 2001 letter. <br /> If you have any questions please contact me at (916) 255-3050 or bartonj0a 65s.swrcb.ca.gov. <br /> ?James L. Barton, R.G. <br /> Associate Engineering Geologist <br /> Attachment <br /> cc: Mr. Michael Infurna, San Joaquin County Environmental Health Services, Stockton <br /> Mr. Richard Calorie, Esq., Stockton <br /> Mr. William Little, Advanced GeoEnvironmental, Stockton <br />