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'CDM Camp Dresser&McKee Inc. <br /> One Walnut Creek Center <br /> 100 Pringle Avenue,Suite 300 <br /> � Walnut Creek,California 94596 <br /> °peraff" Tel:925 933-2900 Fax:925 9334174 <br /> January 6,2000 <br /> Mr.Mike Miller <br /> Solid Waste Manager <br /> City of Stockton <br /> 425 N.El Dorado Street <br /> Stockton,CA 95202 <br /> Subject: Austin Road Landfill <br /> Landfill Gas Monitoring Probe Construction Completion Report <br /> Dear Mr.Miller: <br /> The purpose of this correspondence is to document the completion of the landfill gas <br /> monitoring probe construction at the Austin Road Landfill. The objective of the gas probe <br /> construction was to relocate five,of the probes which make-up the compliance soil-gas <br /> monitoring network at the landfill. <br /> Background <br /> The compliance soil-gas monitoring network at the Austin Road.Landfill consists of 12 <br /> probes as depicted on Figure 1,Soil Gas Probe Locations at the Austin Road Landfill. Five <br /> of these probes,SGP-3A,7,8,9,and 10A,were originally located at the perimeter of the <br /> waste.The specifications for a landfill perimeter monitoring network are defined in the <br /> California Code of Regulations Title 27,Division 2,Solid Waste. Section 20925 C1WMB- <br /> Perimeter Monitoring Network,specifies that"(2)Perimeter monitoring wells shall be <br /> located at or near the disposal site property boundary." Because the perimeter of the waste <br /> does not correspond to the site property boundary at these five monitoring locations,the <br /> City of Stockton instructed Camp Dresser&McKee Inc. (CDM) to relocate the <br /> aforementioned probes to the property boundary. <br /> Soil-Gas Probe Installation <br /> Construction and installation of the soil-gas probes was performed on December 3, 1999,by <br /> personnel from Advanced GeoEnvironmental and Cal-Nev Drilling Co.with CDM <br /> oversight.Robert McClellon and Rodney Estrada with the San Joaquin County <br /> Environmental Health Department were also present during installation to inspect the <br /> borehole surface seals. <br /> Borehole Lithology <br /> Each of the five probe boreholes was drilled using a CME55 drill rig and 7-inch hollow stem <br /> auger. The lithology of each borehole was recorded by personnel from Advanced <br />