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P�UIN <br /> c Z� <br /> THOMAS R. FLINN P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> -,l�, STOCKTON,CALIFORNIA 95201-3018 <br /> DIRECTOR I� o �aA' (209)468-3000 FAX(209)468-2999 <br /> •C4C/FpaaP www.co.san-joaquinxa.us <br /> THOMAS M.GAU !� <br /> DEPUTY DIRECTOR <br /> MANUEL SOLORIO <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> ROGER JANES April 4,2006 <br /> BUSINESS ADMINISTRATOR <br /> Mr. Robert McClellon,REHS <br /> Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> SUBJECT: RESULTS OF FIRST PHASE EXPLORATION TO ASSESS SOURCE OF GROUNDWATER <br /> IMPACT AT THE CLOSED CORRAL HOLLOW LANDFILL <br /> Dear Mr. McClellon-, <br /> I received a copy of a letter from Mr.Michael Wochnic addressed to you,dated February 10, 2006,regarding our <br /> Phase 1 exploratory excavations at the closed Corral Hollow Landfill done in September 2005. The purpose of that <br /> investigation was to assess possible reasons for groundwater impact at one of our groundwater monitoring wells. As <br /> we discussed,this work is part of corrective action approved and required by the Regional Water Quality Control <br /> Board against apparent groundwater impact. Attached please find a copy of the report presenting the results of the <br /> Phase 1 work,and our transmittal letter to Water Board staff. Many of our findings are summarized in that letter. <br /> This investigation determined that the eastern edge of the refuse extends under the eastern landfill road,and that <br /> some of this refuse was not included under the closure cap. We did not excavate into the road due to the presence <br /> of a high pressure petroleum pipeline,but we did not find refuse beyond the road to the east,and have therefore <br /> determined the maximum eastern extent of refuse. However,this first phase did not determine the western edge of <br /> the closure cap, from which the additional cap must be extended. This will be determined in Phase 2 with sufficient <br /> accuracy to ensure that all refuse in the investigation area will be covered by a closure cap(see attached Report). <br /> Please be assured that we do not intend to expose or remove any further refuse. All work will be done in accordance <br /> with the Health and Safety Plan approved by Environmental Health Department. <br /> If you have any questions,please call me at(209)468-8504. <br /> Sincerely, <br /> W. MICHAEL CARROLL,PE <br /> Senior Civil Engineer <br /> WMC:lj <br /> N:\1Corral Hollow\P1anToEvalImpactToGW\RMcC1ellon01-Phase IInvestigResults.doc <br /> Enclosure <br /> c: Mr. Michael B. Wochnic,PE,Closure and Technical Services, CIWMB <br /> 10011 Street Sacramento, CA 95812-4025 <br /> Mr.Todd Del Frate,PG <br /> Central Valley Regional Water Quality Control Board(letter only) <br /> LA 21850 <br />