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oPQUlry. C <br />THOMAS M. GAU <br />• E.• DIRECTOR <br />9 C]j; DiiN <br />FRITZ BUCHMAN <br />DEPUTY DIRECTOR <br />MICHAEL SELLING <br />DEPUTY DIRECTOR <br />STEVEN WINKLER <br />DEPUTY DIRECTOR <br />ROGERJANES <br />BUSINESS ADMINISTRATOR <br />Wwwmg for YOU <br />Mr. Todd Del Frate, PG <br />California Regional Water Quality Control Board <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, California 95670 <br />January 31, 2012 <br />is <br />P. O. BOX 1810 - 1810 E. HAZELTON AVENUE <br />STOCKTON, CALIFORNIA 96201 <br />(209) 468-3000 FAX (209) 468-2999 <br />gWy.1nov.org/pubworks <br />EC IVSD <br />FEB 0 8 x;112 <br />eWRONMENTALPERMIT/SERVIC S`TM <br />SUBJECT: EVALUATION MONITORING REPORT, CORRAL HOLLOW SANITARY LANDFILL <br />Mr. Del Frate: <br />Enclosed, please find the Evaluation Monitoring Report prepared by Geo -Logic Associates submitted in accordance <br />with Item 3, Page 4 of the Order for Technical Reports submitted by the California Regional Water Quality Control <br />Board — Central Valley Region (RWQCB) on July 7, 2011 this report presents the results of the first phase of our <br />investigation of the extent of groundwater impact around the Corral Hollow Landfill. <br />You and I discussed on November 21, 2011 that samples from the three wells drilled in November 2011 show <br />decreasing concentrations of VOCs but do not allow us to assess the extent of groundwater impact with certainty. <br />Although we are not able to complete our Evaluation Monitoring or Engineering Feasibility Report until the extent of <br />release is accurately assessed, the information from these wells allow us to propose locations for a second set <br />(Phase II) of wells which we believe will allow that assessment. The second set will be installed with your approval, <br />also on Caltrans property with Caltrans' permission. The rainy season is soon upon us, so we expect that surface <br />conditions will allow the installation of the Phase II wells in the spring. <br />In order to speed this work and based on my belief that the Phase II locations will be found acceptable to RWQCB <br />staff, we submitted application for encroachment onto Caltrans property on January 12, 2012 and for well drilling <br />permits to San Joaquin County Environmental Health on January 18, 2012. <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:sc <br />N:\1 Corral Hollow\2011WaterBoardOrder\EMP\ToddDelFrate01-EMPReport.docx <br />cc: Wendy Wyles, RWQCB <br />Steve Rosenbaum, RWQCB <br />Robert McClellon, San Joaquin County Environmental Health Department <br />Denis Agar, Caltrans <br />John Hower, Geologic Associates <br />LA 21125C <br />