CORRESPONDENCE_1992-1993 - Laserfiche WebLink

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scales. The ppm scale was used for structure monitoring. The instrument was calibrated with a 2.5% methane mixture and was warmed up for approximately 10 minutes prior to monitoring. The methane level in open air at the labor camp varied from 0 - 20 ppm. Each building contains two apartments. Monitoring consisted of a complete walk-through of each apartment with an emphasis on incoming plumbing, electrical outlets, baseboards, behind stoves, and cracks (if encountered) . Results of the structure monitoring are shown on Table 1. Nineteen structures were monitored. The first 13 structures listed on table 1 are along the east edge of the labor camp from north to south. Structures 14-16 are along the north edge from east to west. Structures 17-19 are in the interior of the labor camp. Due to the low levels found in structures 14-19, the remainder of the interior structures were not monitored. It should be noted that a strong cleanser odor was detected in structures 1 and 2 . A pine sol type cleanser was used in both cases. We put the Gas Tech probe near an open bottle of the cleanser, and the needle exceeded 500 ppm. Therefore, we believe the cleanser had a significant impact on the readings. The tenants were using the gas range in the west half of structure #6. It is not clear whether this would cause the 85 ppm reading found in the kitchen area.