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. i <br />P4U'IN <br />THOMAS R. FLINN <br />DIRECTOR <br />9CiFORia <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 />March 14, 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 />SUBJECT: DESIGN REVISION FOR LANDFILL GAS PERIMETER MIGRATION <br />MONITORING WELL GW -1A AT THE CORRAL HOLLOW SANITARY LANDFILL <br />Dear Mr. McClellon: <br />Attached please find figures showing the revised design for perimeter LFG monitoring well GW -1A, <br />which will replace GW -1 at the Corral Hollow Landfill due to submergence of the lower probe in the <br />existing well. The single significant design revision is the use of 3/4 -inch HDPE probe pipe rather <br />than a sampling tube within a pipe. We make this change to address concerns and comments <br />received from Mr. Gino Yetka regarding the possible need to inspect the interior of the probes after <br />installation. Although the purge time of this single -piece pipe design is much longer than the <br />previous tube -within -pipe design, this new design provides a pipe without joints. Also, sampling <br />connections in this new design are consistent with existing wells at that site. <br />We intend to schedule installation of this well at the end of this month, and will give your <br />Department ample notice for inspection during construction. If you have any questions, please <br />contact Joyesh Chandra at (209) 468-3066 or me at (209) 468-8504. <br />Sincerely, <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />W MC:Ij <br />N:\1Corral Hollow\LFGPerimMonit\RMcClellon01-Well Design.doc <br />Attachment <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 21850 <br />