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7 1 A9 : 51 <br /> Emcon - , - ; " A ORKS <br /> ASSOCIATES DE <br /> Consultants in Wastes May 7, 1987 <br /> Management and <br /> Environmental Control Project 939-01.04 <br /> Mr. Tom Horton <br /> Solid Waste Manager <br /> Department of Public Works <br /> County of San Joaquin <br /> P.O. Box 1810 <br /> 1810 East Hazelton Avenue <br /> Stockton, California 95201 <br /> Re: Harney Lane Sanitary <br /> Landfill, Lodi, Cali- <br /> fornia <br /> Dear Mr. Horton: <br /> In accordance with Agreement A-87-233 for consulting engineering ser- <br /> vices at the Harney Lane Sanitary Landfill , this letter will report on <br /> EMCON' s services for Tasks 4, 5, and 6 which are related to landfill gas <br /> (LFG) monitoring and migration. <br /> SERVICES PERFORMED <br /> During the period between March 26 and 28, 1987, a total of 10 LFG <br /> monitoring probes were installed in native soils around the perimeter of <br /> the refuse-filled areas. The probe identification and locations are <br /> shown on the enclosed Drawing No. 2 (939-01.07) . The borings for the <br /> probes reached depths of 25-1/2 to 45 feet below the ground surface. <br /> Logs of the borings are attached. It should be noted that the logs of <br /> borings should not be used for any purpose other than a general indica- <br /> tion of the types of soils encountered during installation of the <br /> probes. Also please note that 1 of the 11 borings (Boring P-7A) had to <br /> be relocated because of water encountered during excavation. <br /> The installed probes were initially monitored on March 28, 1987 with <br /> measurements taken for pressure and for combustible gas and oxygen con- <br /> centration. The results are shown on Figure 1. On April 3, 1987, the <br /> probes were again monitored for pressure, combustible gas and oxygen <br /> (Figure 2). The gas samples from the probes were also analyzed for <br /> methane, oxygen, nitrogen, and carbon dioxide content by using EMCON's <br /> portable gas chromatograph. Figure 3 contains these results. <br /> Headquarters: <br /> 1921 Ringwood Avenue, San,Ease. California 95131, (408y 275.1444 <br /> Branch office:445 W. Garfield Avenue,Glendale. California 91204 <br />