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indicator will be calibrated for methane, and work at eh site will cease if concentration reach 20 percent <br />or higher of the lower explosive limit for methane (actual concentration of 1 percent or greater). In <br />addition to monitoring for flammable, a photoionization detector (PID) will be used to monitor for BETX. <br />If the PID reading consistently exceeds 10 parts per million (ppm) in the work area, then work will cease. <br />Level C PPE will be donned prior to continuing work at the site. Actions will then be taken to allow <br />either natural ventilation or forced ventilation to dissipate the concentration until safe working conditions <br />once again exist. <br />Soil Vapor Extraction System <br />Monitoring for flammable concentration of methane gas will be conducted continuously using a <br />combustible gas indicator during the installation for the soil vapor probes. The combustible gas meter will <br />be calibrated for methane, and walk at the site will cease if concentration reach 20 percent or higher of <br />the lower explosive limit for methane (actual concentration of 1 percent or greater). <br />This will be only monitoring required since no contamination will be present at eh soil surface. <br />MEDICAL SURVEILLANCE REQUIREMENTS <br />Medical surveillance is conducted as a routine program which meets the requirements of 29 CFR <br />1910.120 (f). There will not be any special medical tests or examinations required for staff involved in <br />their project. <br />There is potential for field activities to have an impact on neighboring business in the vicinity of Chevron <br />Station. Prior to the start of field work and periodically during field work, these businesses will be <br />briefed on the project and its progress. Emergency response coordination will be accomplished through <br />the local fire district. <br />Due to variability in wind direction at this site, the esckusin zone will vary as dictated by wind <br />conditions. During off-site activity, on or near streets, traffic control will be utilized as described int eh <br />"Work Area Traffic Control Handbook" published by building News, Inc. Figure C-1 shows a layout of <br />the site with planned work areas highlighted. <br />The nearest emergency medical assistance is St. Pomonics Hospital located at 1777 W. Yosemite Avenue, <br />Manteca, Ca, telephone number (209) 823-0123. Doctor's Hospital of Modesto located at 1441 Florida <br />Avenue, (209) 578-1211. <br />Work Practices <br />Safe work practices to be employed during the entire progress of field work are as follows: <br />1. Set up, assemble, and check out all equipment for integrity and proper function before entering <br />the restricted work area and prior to starting work activities. <br />2. Do not use faulty or suspect equipment. <br />3. Use only new and intact protective clothing. Change the suit, gloves, etc. if they tear. <br />