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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 varied from 0 - 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 1. <br /> Fifteen structures were monitored. The first 12 structures <br /> listed on table 1 are along the east edge of the labor camp from <br /> north to south. Structures 13-15 are along the north edge from <br /> east to west. Due to the low levels found in structures 1-15, <br /> the remainder of the structures were not monitored. <br /> ' Structure monitoring of the farm labor camp will continue on a <br /> quarterly basis. Therefore, the next monitoring event is <br /> scheduled for March 29, 1993 . <br /> ON SITE STRUCTURES <br /> The scale house was removed from the site in December, 1992 . The <br /> ' off ice/maintenance shed was monitored for methane on 12\15\93 <br /> The methane reading was approximately 20 ppm. Monitoring will <br />