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. . <br /> STRUCTURE MONITORING <br /> On January 25, 1994, San Joaquin County performed a quarterly <br /> labor camp monitoring event. Present during monitoring were Wes <br /> Johnson of the County Solid Waste Division, and a staff member <br /> from the labor camp. <br /> The equipment used was a Gas Tech Landfill Monitor equipped with <br /> parts per million (ppm) , Lower Explosive Limit (5%) , and 100% gas <br /> scales. The ppm scale was used for structure monitoring. The <br /> instrument was calibrated with a 2 .5% methane mixture and was <br /> warmed up for approximately 10 minutes prior to monitoring. The <br /> methane level in open air at the labor camp was approximately 20 <br /> Ppm• ', <br /> Each building contains two apartments. Monitoring consisted of a <br /> complete walk-through of each apartment with an emphasis on <br /> incoming plumbing, electrical outlets, baseboards, behind stoves, <br /> and cracks (if encountered) . In addition, vents on the roofs of <br /> two buildings were monitored. <br /> Results of the structure monitoring are shown on Table 2 . <br /> Similar to previous monitoring events, fifteen structures were <br /> monitored. The first 12 strjWurejoistedon table 2 are along <br /> the east edge of the labor cdl§llW north to south. Structures <br /> 13-15 are along the north edge from east to west. <br />