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�rillllll� � � 1111III� PACMCZJGH7MMM1WSYS7MS E� Washington Boulevard, Commerce, California 0 ASUMOUNror Pbdhc Lighting rEELEPHOW Corporation (2m n5-1139 March 23, 1984 R. W. Seigfried and Associates 4045 Coronado Avenue Stockton, CA 95204 Attn: Robert G. Celum Subject: Stockton Landfill Gas to Energy Project Dear Mr. Celum: Thank you for your letter of March 16, 1984 requesting additional information for our permits with the City of Stockton. The methane gas extraction wells are drilled by typical water well drillers using a 30 to 36 inch auger. The well size is normally 6 inch PVC perforated pipe. In some cases the well head is reduced to 4 inch PVC. The wells are drilled to the bottom of the landfill. In the case of Stockton, this would be approximately 40 feet. Wells are spaced approximately one to one and one half per acre. OSHA has specific instructions for working around gas both in open and enclosed areas. Contractors are required to follow this procedure. The landfill gas extraction system does not alter water quality. We do not add any water to the landfill. Gas condensate is left in the landfill. The gas gathering system can be above or below ground. In the case of Stockton, we will probably put the collection system above ground. The system is normally constructed of schedule 40 PVC pipe which is not under pressure. It is kept at a slight vacuum. This has an obvious advantage in the area of safety. When the collection system is buried, the depth varies from 1 foot to approximately 5 feet, depending on what is practical. A collection system must have a grade of 3 to 4%. The landfill gas is used directly to power a gas engine which drives an electrical generator. The generator is normally connected to a transformer that raises the generated low side voltage to a high side voltage to match I,- the serving utility. In the case of Stockton, we would �11 I r.,�J� ' 0 APPENDIX s1Al�