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i <br /> `ul <br /> THOMAS M.GAU Vvie P.O.BOX 1810•1810 E.HAZELTON AVENUE <br /> DIRECTOR * - 'N STOCKTON,CALIFORNIA 95201 <br /> (209)468-3000 FAX(209)468-2999 <br /> www.sjgov.org/pubworks <br /> FRITZ BUCHMAN <br /> DEPUTY DIRECTOR WOrkmg fcw YOU <br /> MICHAEL SELLING <br /> DEPUTY DIRECTOR `i.� <br /> ROGERJANES ��// <br /> BUSINESS ADMINISTRATOR <br /> 7October 15, 2012 <br /> Mr. Todd Del Frate, PG ENVIRONMENTAL HEALTH', <br /> California Regional Water Quality Control Board pERM[r�SEjVICE� <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95670 <br /> SUBJECT: COMMENTS REGARDING NOTICE OF VIOLATION ISSUED SEPTEMBER 26, 2012 <br /> FOR EVALUATION MONITORING REPORT SUBMITTED AUGUST 20, 2012 <br /> CORRAL HOLLOW SANITARY LANDFILL <br /> Dear Mr. Del Frate: All <br /> �0 <br /> We are in receipt of the above-referenced Notice of Violation (NOV), the most important item of which <br /> seems to be that the extent of groundwater impact was not sufficiently delineated. Upon reading the text <br /> of the NOV, I realized the importance of showing a "non-detect" or"zero" iso-concentration line, or other <br /> direct reference to the extent of plume, on the figures. We incorrectly assumed that the reader would <br /> understand that the non-detect line was not far beyond the low concentration lines we did show. <br /> I apologize for that oversight. <br /> To rectify this, I have asked GeoLogic Associates to revise the figures to show the extent of the plume <br /> (attached). A figure showing extent of PCE is also included. These figures conform very well to the <br /> original figures, showing that the plume does not extend far from the original low-concentration lines. <br /> Perhaps, after reviewing these revised figures, we can agree that we have sufficiently characterized the <br /> extent of the plume to allow an Engineering Feasibility Study. I look forward to discussing this and other <br /> important issues in our upcoming meeting. <br /> Please call me with any questions at (209) 468-8504. <br /> Sincerely, <br /> W. MICHAEL CARROLL, PE <br /> Senior-Civil Engineer, Solid Waste Division <br /> WMC:kb <br /> N:\1 Corral Hollow\2011Waterl3oard0rder\EMP\Phase 2\ToddDe[Frate02-NOV_Comments.docx <br /> Attachment <br /> cc: Wendy Wyles, RWQCB <br /> Robert McClellon, San Joaquin County Environmental Health Department <br /> John Hower, GeoLogic Associates <br /> LA 21125C <br />