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V <br /> 91 NOV 4 P 03 <br /> mcon CPT. OF PUBLIC WORKS <br /> SSOCIATES <br /> nsuttants in Wastes November 1 1991 <br /> Management and <br /> Environmental Control Pr-bject 939-01.09 <br /> Mr. Gabriel Karam, P.E. <br /> County of San Joaquin <br /> Department of Public Works <br /> 1810 East Hazelton Avenue <br /> Stockton, California 95201 <br /> Re: Decommissioning and installation of gas moMffMnd91T . <br /> y ` ea <br /> Dear Mr. Karam: <br /> EMCON Associates (EMCON) is pleased to submit this letter report on the <br /> decommissioning of single-level gas wells and the installation and sam- <br /> pling of tri-level soil-gas wells at San Joaquin County's Harney Lane Land- <br /> 1011 fill in Lodi, California (figure 1). The tri-level wells were installed to allow <br /> lateral migration of methane from the landfill to be detected, in compliance <br /> with closure/postclosure maintenance requirements contained in California <br /> Code of Regulations Title 14. This report describes the procedures used <br /> in well installation, decommissioning, and monitoring, and discusses the <br /> data obtained•from the initial monitoring of the new wells. <br /> 1 SOIL-GAS PROBE DECOMMISSIONING PROCEDURES <br /> EMCON decommissioned five existing gas wells (P-2, P-5, P-6, P-7, and <br /> P-10) at the Harney Lane Landfill on October 11, 1991. Two other existing <br /> gas wells scheduled for decommissioning (P-1 and P-8) could not be <br /> located. Both the existing and the proposed well locations were deter- <br /> mined by the County and are shown in figure 2. To decommission each <br /> well, the probe casing was first pulled from the ground. The original well <br /> boring site was then redrilled to a depth at which native soil, rather than <br /> well construction material, returned to the surface on the auger, indicating <br /> that the .bottom of the original boring had been reached. The borehole <br /> was then filled to the surface with a nine-sack concrete slurry. <br /> PJ9 9390109.GOW <br /> L <br /> VIM! Ringwood Avenue, San Jose, California 95131,.(408)453-7300 <br />