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BROWN AND CALDWELL ~ <br /> CONSULTING ENGINEERS <br /> <br /> July 8, 1986 : <br /> <br /> Mr. Martin W. Inderbitzen <br /> Gale, Seibel, Inderbitzen <br /> 62 West Neal Street <br /> Pleasanton, California 94566 11-19-2646-01/1 <br /> <br /> Subject.- Methane Gas Control at <br /> the Pleasanton Garbage <br /> Service Landfill <br /> <br /> Dear Mr. Inderbitzen= <br /> <br /> The gas migration control system proposed in our May 9, <br /> 1986 letter consists of one extraction well located in the <br /> vicinity of borehole M-4 near the property line. The gas <br /> extraction well is connected to the vacuum pump via a <br /> header pipe. The vacuum pump discharges to either a flare <br /> or the atmosphere. The need for a flare will be determined <br /> by the regulatory agencies. <br /> <br /> It is assumed the blower will be in an enclosed building <br /> adjacent to the flare (if required) and that these <br /> facilities are located in a flat and easily accessible <br /> portion of the site. Existing monitoring probes will be <br /> used to determine the radius of influence of the one <br /> extraction well. If methane concentrations do not drop in <br /> the minitoting probes, a second extraction well may have to <br /> be added on the Martin property to further reduce methane <br /> gas concentrations. The second extraction well will be <br /> tied into the existing header pipe and vacuum pump. <br /> Specific design requirements (for example, flare, type and <br /> size of blower and pipe, etcetera) are determined during <br /> the conceptual design phase. The design can be completed <br /> in approximately 8 weeks after authorization to proceed. <br /> Construction and system startup should take approximately 8 <br /> to 10 weeks after selection of a contractor. <br /> <br /> The one well system proposed is intended to control further <br /> offsite gas migration and to potentially eliminate problems <br /> with gas that has already migrated offsite. The system is <br /> not intended to provide all the necessary protection for <br /> any future development on the landfill itself. <br /> <br /> EXHIBIT B <br />2025 NCRTH THIRD STREEI:. SUITE S45 PHOENIX. AZ 85,004 · (602) 253-25.24 <br /> <br /> <br />