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6.1 CALIBRATION SPECIFICATION <br /> Instnment Gas Span Reading Method <br /> PID: HNu, 10.2 ev probe 100 ppm iwbutylene 9.8 t 2.0 55 ppm 1.5 Urn reg <br /> T-robing <br /> 0.25 Unt reg <br /> direct tubing <br /> PID: HNu, 11.7 ev probe 100 ppm isobutylene 5.0 }2.0 68 ppm 1.5 I/m reg <br /> T-tubing <br /> 0.25 Urn reg <br /> direct tubing <br /> FID: OVA-128 100 ppm methane 3.0 t 1.5 100 ppm 1.5 1/m reg <br /> T-tubing <br /> CGI: MSA 260,261,360,or 0.75%pentane N/A 50%LEL 1.5 1/m reg <br /> 361 f 5 % LEL direct tubing <br /> 6.2 AIR SAMPLING <br /> Method and Description: OVM will be used to monitor the area where boring installation is conducted. <br /> Air monitoring readings in the breathing zone will be taken every 15 minutes. If measurements exceed <br /> background levels, personal protection equipment (PPE) may be upgraded. Background concentrations in <br /> air will be established upwind and downwind of the work area before the work begins. The background <br /> concentration will be reestablished each day the project site is entered. <br /> Personnel: Air monitoring will be conducted throughout the source of this work to assess the potential <br /> for exposure to airborne contaminants and hazards to site personnel. Periodic personnel monitoring is <br /> critical due to anticipated exposures changing during the course of excavation. <br /> Areas: All work locations and in the worker's breathing zone. <br /> Results to be interpreted b SC <br /> 16 <br /> SF01001385F.WP5 <br />