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oPq°J'�N••.r i <br /> ®G� COUNTY OF SAN v `�OA U I THOMAS R.FLINN <br /> < DEPARTMENT OF PUBLIC WORKS DEPUTY DIRECTOR <br /> .: _ ;'• P.O.BOX 1810—1810 E.HAZELTON AVENUE MANUEL LOPEZ <br /> STOCKTON,CALIFORNIA 95201 DEPUTY DIRECTOR <br /> C9C%F®R�eP (209)468-3000 STEVEN WINKLER <br /> FAX(209)468-2999 DEPUTY DIRECTOR <br /> HENRY M.HIRATA <br /> DIRECTOR <br /> May 30, 1997 <br /> MHMQRAND_ IZM <br /> TO: Ed Padilla, Lead Senior REHS <br /> Public Health Services <br /> Environmental Health Division <br /> FROM: Gabriel Karam <br /> Senior Solid Waste Engineer <br /> SUBJECT: LANDFILL GAS CONTROL - CORRAL <br /> HOLLOW SANITARY LANDFILL <br /> The Department of Public Works submitted a memo dated March 14, <br /> 1997, which was in response to your letter dated January 3, 1997, <br /> regarding landfill gas monitoring/control at the Corral Hollow <br /> Sanitary Landfill . In our memo, the County requested an <br /> exemption from the requirement of installation of a landfill gas <br /> control system. We would like to revise the gas generation data <br /> that was provided in our memo of March 14, 1997. This data was <br /> based on in-place cubic yards of waste, rather than tons. <br /> The beginning in-place volume at the Corral Hollow Sanitary <br /> Landfill was calculated using Softdesk engineering software. <br /> This software is capable of calculating volume between two <br /> irregular surfaces. The volume was calculated using the average <br /> end area method. The bottom surface is taken from a map <br /> representing contours in 1954, which is the approximate time <br /> waste disposal began at the Corral Hollow Sanitary Landfill . The <br /> top surface represents current contours including final cover as <br /> surveyed in May 1996 by County staff. The total volume has been <br /> calculated to be approximately 1 .686 million cubic yards. Using <br /> a density of 1,000 pounds per cubic yard, the total in-place <br /> tonnage at the Corral Hollow Sanitary Landfill is estimated at <br /> 843, 000. <br /> As mentioned in our previous memo, landfill gas generation data <br /> is predicted by the Environmental Protection Agency's Landfill <br />