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ENVIR#14MENTAL HEALTt I I <br />PqU IN <br />�O �OOG <br />Donna K. Heran, R.E.H.S. <br />Director <br />Laurie A. Cotulla, R.E.H.S. <br />ca��FOR��P Assistant Director <br />January 31, 2007 <br />Michael Carrol <br />San Joaquin County <br />Department of Public Works <br />1810 E.Hazelton Ave <br />Stockton, CA 95201 <br />SAN JOAQUIN COUNTY <br />304 East Weber Avenue, Third Floor <br />Stockton, California 95202-2708 <br />Telephone: (209) 468-3420 <br />Fax: (209) 464-0138 <br />Website: www.sjgov.org/ehd/ <br />Program Coordinators <br />Carl Borgman, R.E.H.S. <br />Mike Huggins, R.E.H.S., R.D.I. <br />Margaret Lagorio, R.E.H.S. <br />Robert McClellon, R.E.H.S. <br />Jeff Carruesco, R.E.H.S. <br />Kasey Foley, R.E.H.S. <br />RE: Phase 2 Workplan to Assess Extent of Closure Cap at the Closed Corral Hollow Landfill <br />The San Joaquin County Environmental Health Department (EHD) has reviewed the above cited <br />document and has the following comments: <br />1. During the site investigation additional potholes may be necessary to accurately determine the <br />extent of waste outside the prescriptive cap. <br />2. Plan indicates that County would install a plastic membrane to extend the closure cap north- <br />west of SB -1, and install a horizontal LFG collector trench beneath that membrane. The <br />horizontal collector would be connected to the LFG system through a header pipe. <br />- Has the proposed expansion of the landfill gas system been approved by the San Joaquin Valley <br />Air Pollution Control District? <br />- What precautions will be made to insure that the interface between the clay liner and the HDPE <br />liner are properly sealed? <br />Revise plan to include this information. <br />3. The EHD needs be present during the site work takes place. Notify the EHD 48 hours in advance <br />of any site work. Contact all affected agencies (CIWMB, SJVAQMD, and the RWQCB) and <br />determine their availability for inspection of site work prior to scheduling any site activity <br />regarding this workplan. <br />If you have any questions, please contact Natalia Subbotnikova, R.E.H.S. at (209) 468-0338. <br />Robert McClellon, Program Coordinator, R.E.H.S. <br />Environmental Health Department <br />Cc: Gino Yekta <br />CIWMB, MS 10 <br />