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Mr. Martin W. Inderbitzen <br /> May 27, 1986 <br /> Page 7 T <br /> <br /> 5. A LFG extraction system near the property boundary should be.- <br /> effective in removing the LFG from the Martin Property. <br /> Removal would be to a level to comply with state and federal <br /> regulations. <br /> <br /> 6. Additional investigation work is not required to define the <br /> area1 extent of LFG movement onto the Martin Property. <br /> <br /> Our recommendations for reducing the LFG concentrations on the Martin <br /> Property to the 1 ira its prescribed by regulations, based on this <br /> study, are: <br /> <br /> 1. Install a gas extraction well and mechanical blower near the <br /> Martin Property boundary. Operate the blower and monitor <br /> the methane concentrations in Boreholes M5, M8, and M9. <br /> Measure pressure differentials in the monitoring probes to <br /> determine system performance. <br /> <br /> 2. If methane concentrations do not drop in those boreholes, <br /> install a second extraction well on the Martin Property to <br /> extract the LFG in the area of MS, MS, and M9. No drop in <br /> methane concentration would indicate discontinuous sand <br /> lenses. <br /> <br /> 3. Continue to operate the extraction wells until legal limits <br /> are obtained. The boundary well will be operated as long as <br /> the landfill continues to generate LFG. <br /> <br />Under separate cover we have prepared a preliminary cost estimate to <br />complete an LFG extraction and treatment facility. We would be <br />pleased to continue this project into the design phase. We are <br />prepared to discuss our conclusions and recommendations with you. <br /> <br />Very truly yours, <br /> <br />Hilary Theisen <br />Vice President ~.~;..e~ <br /> '... .......' <br />MEL: lah <br />Enc 1 o su re s <br /> <br />cc/enc: Ms. Mary Lucas, Brown and Caldwell <br /> <br />BROWN AND CALDWELL <br />P 0 BOX 8045 WALNUT CREEK. CA 94596-1220 · (415) 937-9010 TELEX 33-6490 · OFFICE AT 3480 BUSKIRK AVENUE PLEASANT HILL 94523 <br /> <br /> <br />