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Pq��N • <br />THOMAS M. GAU <br />DIRECTOR <br />9CiFOttN <br />FRITZ BUCHMAN <br />DEPUTY DIRECTOR <br />MICHAEL SELLING <br />DEPUTY DIRECTOR <br />JIM STONE <br />DEPUTY DIRECTOR <br />ROGER JANES <br />BUSINESS ADMINISTRATOR <br />Ms. Natalia Subbotnikova, REHS <br />Environmental Health Department <br />1868 E. Hazelton Ave. <br />Stockton, California 95205 <br />April 25, 2013 <br />R 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 />7 <br />EN PEP ia/SERVICESLTH <br />SUBJECT: REVISED WORK PLAN FOR THE ADDITIONAL SOIL GAS MONITORING <br />WELLS AT CORRAL HOLLOW SANITARY LANDFILL (CHSL) <br />Dear Ms.Subbotnikova: <br />Thank you for approving the permit application (SR # 0066942) for the two soil gas wells at <br />CHSL. After getting the drilling permits, we again evaluated the well depths of the soil gas wells <br />for maximum detection of Landfill Gas (LFG) migration at the southeastern perimeter of the <br />landfill. The original soil well design depths may not provide adequate LFG detection. <br />The original soil gas well depths were designed to be above the shallow aquifer's groundwater <br />table in compliance with Title 27 Section Article 6 Section 20925. However, compliance with <br />this regulation may not be relevant in this this situation due to the presence of a lower aquifer. <br />In order to increase LFG migration detection, we now propose to increase the soil gas well <br />depths to be at the lowest refuse elevation. The well depth increase will cause penetration <br />through the shallow aquifer. A bentonite plug will be placed in the well's boring around the <br />penetration section of the shallow aquifer, to prevent drainage of the aquifer. <br />Enclosed, please find a revised work plan for the two new soil gas wells for your review. We <br />intend to install the soil gas wells with the revised depths after regulatory agencies approval and <br />completion of the Closure Cap Extension Project. If you need more information, please contact <br />Joyesh Chandra, Engineer II, at 468-3066. <br />Sincerely, <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />MC:Jc:kb <br />NA1 Corral Hollow\LFG MigrationMonit\GW-8 & 9\NSubbotnikova 02 -Permit App_MW_8&9.doc <br />Enclosure <br />c: Gino Yetka, California Department of Resources Recycling and Recovery <br />LA 21123 <br />LA 21887 <br />