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7 '70'E IV E. <br /> u O'YIN wOUNT <br /> v <br /> 9l NOV 4 P 03 <br /> ILC WORKS <br /> ASSOCIATES <br /> Cortsuftaim tn Wastes November 1, 1991 <br /> Manageiment <br /> Environmental contra Priject 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 mo 0 <br /> K <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 /> fill in Lodi, Cafifornia (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 /> SOIL-GAS PROBE DECOMMISSIONING PROCEDURES <br /> EMCON decommissioned five existing gas wells (P-2, P-5, P-6, P-7, and <br /> P-1.0) 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 redriiled 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 /> 1921 RinawoM Avantra. Can ,lnec r`nwnm;a orifi (AMP) .4mi- 'inn <br />