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pPpU1N C <br />THOMAS R. FLINN <br />DIRECTOR <br />C9C%Fp•R��P <br />THOMAS M. GAU <br />CHIEF DEPUTY DIRECTOR <br />MANUEL SOLORIO <br />DEPUTY DIRECTOR <br />STEVEN WINKLER <br />DEPUTY DIRECTOR <br />ROGER JANES <br />BUSINESS ADMINISTRATOR <br />June 26, 2007 <br />Mr. Todd Del Frate, Engineering Geologist <br />California Regional Water Quality Control Board <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, California 95820-6114 <br />SUBJECT: EXPANDED INVESTIGATION OF CLOSURE CAP <br />CORRAL HOLLOW SANITARY LANDFILL <br />Dear Mr. Del Frate: <br />P. O. BOX 1810 - 1810 E. HAZELTON AVENUE <br />STOCKTON, CALIFORNIA 95201 <br />(209) 468-3000 FAX (209) 468-2999 <br />www.sjgov.org/pubworks <br />As we discussed, our investigation of the extent of the closure cap at the Corral Hollow Landfill has <br />revealed that refuse extends to the drainage ditch without closure cap on the northern point of the <br />landfill within the area of our present investigation. We therefore propose to expand the <br />investigation eastward along the drainage ditch, investigating in accordance with the approved <br />Phase 2 Investigation of Extent of Closure Cap, originally submitted January 2006 (see Figure 2, <br />attached). As you recall, our investigation along the road on the eastern side of the landfill was <br />restricted due to the presence of the active petroleum pipeline in the center of the road, and we did <br />not dig in the road to avoid the pipeline. No such constraint exists in the proposed new area of <br />investigation. <br />As we also discussed, the abandoned pipeline extends east of the eastern access road between <br />SB -1 and MW -4 (Figure 2), making impossible trenching perpendicular to the road to verify that <br />refuse has not been disposed east of the access road as originally proposed. We therefore plan to <br />dig parallel to and between the road and pipeline in this area. Please note that our investigations <br />have not found refuse east of the eastern access road at any location. <br />If you have no objections, we plan to resume our work on the site Monday, July 2, 2007. If you <br />have any questions,. please call me at (209) 468-8504. <br />Sincerely, <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />WMC:kb <br />NAII Corral HolloMClosureCoveACH Phase 2 Covr Inv OAMelFrateOl-Moreinvestigation.doc <br />Enclosure <br />c: Robert McClellon, Environmental Health Department (by email) <br />LA 11103C <br />