Specifications include, but are not limited to: The following field sampling shall be performed by a qualified environmental professional as defined by the Alaska Department of Environmental Conservation (ADEC), in general accordance with the ADEC’s Field Sampling Guidance (current version), and OSHE requirements as described in 29 CFR 1910.1001 and 29 CFR 1910.1053. Sampling will occur over a period of three consecutive days during the street sweeping on the MOA roadways (usually around first couple weeks of May). Low-flow air sample pumps calibrated to a flow rate of 1.7 liters per minute shall be utilized for the collection of respirable crystalline silica samples in 37 mm membrane cassettes with 5.0-micron PVC filters preceded by 10 mm nylon Dorr Oliver cyclone units. Sample pumps will be calibrated before and after use with a representative filter cassette installed between the pump and the calibration device. Samples will be collected from within the “breathing zone” of the employee (i.e., in the driver area of the bus) During each day of sampling, 7 silica sample pumps will be deployed prior to the start of each shift, with one pump each being placed in the drivers’ area of the bus. The sample pumps will be rotated each day such that 10 percent of the total population of drivers will wear an asbestos sample pump for one full 8-hour shift on one day. These drivers shall be spread across a minimum of 10 percent of total routes (2 routes). Additionally, on each of the 3-day sampling period for the bus drivers, one respirable silica pump will be placed at both the entrance and exit of the Municipal Bus Barn, located at 3555 Dr. Martin Luther King Jr. Avenue. These sampling pumps will remain at these locations for a full 8-hour shift during each day and the sampling media will be located within the breathing zone, three to five feet above the ground surface. In total, three samples for respirable silica will be collected from within the bus barn over the course of the sampling period. During each day of the sampling all 7 bus deployed pumps and filters and the 2 barn pumps and filters will be monitored for tampering by a 3rd party, this can be completed by continuous visual or video observation.