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11 <br />IOU <br />From: Becky Klingman [BKlingman@millerbrooksenv.com] <br />Sent: Monday, September 08, 2008 12:31 PM <br />To: Natalia Subbotnikova [EH] <br />Subject: follow up question regarding permits <br />IR Page 1 of 1 <br />Hi Natalia, <br />Thanks for returning my call. We will be drilling into the cap of the landfill to install the methane system. <br />Here is the description from our workplan: <br />Vent wells will be installed adjacent to areas indicating methane concentrations exceeding 5% along <br />the perimeter of the landfill, specifically, adjacent to PGP -1 and PGP -2. The lateral spacing for the <br />passive vent network will range from 100 feet to 150 feet depending on the configuration of the landfill. <br />The vent wells will be installed 50 feet from the edge of the landfill. In addition, four vent wells will be <br />installed in the center of the landfill to release landfill gas in the areas of maximum accumulation. <br />Figure 3 presents the proposed vent well locations for the four interior vents which will be determined in <br />the field based on lithology and/or waste characteristics. <br />Each vent well will be installed by drilling a 10 -inch diameter boring to the base of the waste, estimated <br />to be at a depth of approximately 30 feet below ground surface. The boring will be completed as a <br />vent well by installing 4 -inch diameter HFPE (or equivalent) pipe that is perforated within the waste. The <br />perforated interval will have 1/2 -inch holes and the perforated portion will be covered with a geofabric <br />sock. The annular space adjacent to the screen will be filled with 3/8 -inch pea gravel. The annular <br />space that extends from one foot above the screen to the surface will be filled with a 3 -foot layer of <br />hydrated bentonite chips followed by cement bentonite grout. The upper portion of the borehole will <br />be sealed with concrete. The well will be connected to a 200 pound canister of granular activated <br />carbon and a temporary vent riser that will be 10 feet tall and capped with a weather head. Final <br />configurations will be determined after testing and engineering as described below. Figure 4 presents <br />the vent well design. <br />I am assuming we will need intall permits for each? <br />Thanks, <br />Becky <br />Becky Klingman <br />Project Scientist <br />Miller Brooks Environmental, Inc. <br />2124 Main Street, Suite 200 <br />Huntington Beach, Ca 92648 <br />Office: 714.500.5405 <br />Cell: 714.944.9303 <br />Fax: 714.960.2462 <br />Please join our efforts in supporting the American Heart Association's Orange County Heart Walk. You <br />can visit our team page at: <br />http://heartwalk.kintera.org/faf/r.asp?t=4&i=255424&u=255424-2094645 87&e=1635653230 <br />9/9/2008 <br />