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pPpU1N. C <br />' Za <br />THOMAS R. FLINN <br />DIRECTOR <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 />Mr. Robert McClellon, REHS <br />Environmental Health Department <br />600 East Main Street <br />Stockton, California 95202 <br />April 24, 2008 <br />0 <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 />t�vv1n3 <br />If. 1 n i- f7', i <br />SUBJECT: DESIGN CONCEPT FOR THE LOCATION OF PERFORATED PIPE IN LANDFILL GAS <br />MIGRATION MONITORING WELL GW -1A AT THE CORRAL HOLLOW LANDFILL <br />Dear Mr. McClellon: �� <br />This letter is in respdnse to your question regarding the location of the perforated pipe in perimeter <br />migration monitoring well GW -1A, installed at the closed Corral Hollow Sanitary Landfill earlier this <br />month. <br />As you know, this well replaced existing well GW -1 due to the submergence of the lower <br />perforation section of the original well by groundwater, which is approximately 64 feet deep at that <br />location. To avoid submergence in the future, we installed new well GWAA with three sampling <br />sections (rock filled), the deepest of which extends from approximately 50 to 70 feet deep, thereby <br />avoiding the groundwater at the time of installation. The perforated section of the sampling pipe <br />was installed in the upper five feet of the sampling section to prevent submergence of the <br />perforated section. <br />Although I do not believe it likely that the groundwater table will rise to the top of the deep sampling <br />section, I felt it prudent to design the well to avoid any possible future submergence, especially in <br />light of the submergence of the bottom of the previous well. <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:kb <br />N:\1 Corral Hollow\LFGPerimMonit\GW 1A\RMcCIeIIon02-BottomProbe.doc <br />c: (by email): Gino Yetka, Closure and Technical Services, CIWMB <br />Todd Del Frate, PG, Central Valley Regional Water Quality Control Board <br />LA 21123 <br />