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i <br /> SEISMIC SURVEY <br /> Temporarily-placed pin flags are used to mark the location of the receivers off the <br /> shoulder area (geophone arrays along the side road). The Source (vibrator) interval is <br /> also marked (same pin flags) along the road. The vibrator sweeps through its source <br /> point along the roadway. An underground services alert meeting will be scheduled to <br /> delineate subsurface/surface utilities along the survey transects. No source points will <br /> be located at these intersections. Peak particle velocities typically encountered are <br /> under 0.5 IPS at 10 feet from the vibrator pad during vibrator"sweeps". After the <br /> seismic readings are taken all pin flags, geophones, connecting cables will be removed <br /> from the side of the roadway. The total survey time should only be 3-4 days for the full 6 <br /> miles. Distance between signs will be 500 feet. All "Cable Crossings" will have road <br /> signs labeled as such and traffic cones, the seismic cables will be inserted in flat road <br /> mats and duct taped to the road. <br /> TRAFFIC CONTROL <br /> Bay will place all required traffic signage along the individual seismic survey lines and <br /> along both sides of intersecting roadways_ The traffic control signage is on USDOT <br /> approved breakaway platforms. Due to the limited distance of the surveys and good <br /> sight visibility, Bay will employ One Lane, Two-Way Traffic Control (Figure of typical <br /> layout is provided in Figure TTC-18.0). <br /> Flagger method will be used to control traffic and minimize traffic delay with <br /> unobstructed traffic. A minimum of two flaggers will be used for traffic control. The lead <br /> flagger will be in front of the two vibrator vehicles. Flaggers will use slow/stop traffic <br /> signs and will be within radio communication with each other and the vibrator operators <br /> (layout provided in Figure 4). Visual contact between the flagger will be maintained. <br /> Flaggers are certified in the Commonwealth of Virginia and have completed flagmen <br /> training course with Bay Geophysical, Inc. <br /> Work will be conducted during daylight hours. All Bay field vehicles have roof-mounted <br /> amber revolving lights and high-centered amber strobe-flashers. Vibrators have amber <br /> roof lights, high flashers, Slow Moving Vehicles triangles and lighted traffic control <br /> arrows (see photo provided of vibrator). Signs will be removed during non-working <br /> hours. Parking will not be allowed on the opposite shoulder within 500 feet of the <br /> working area. All personnel have safety vest with reflectors stripes. Parked vehicles <br /> along the survey line will be parked off the roadway and will have traffic cones in a taper <br /> configuration. <br /> Bay's Operation Manager in the field will be John Reynolds (cell phone contact at 231- <br /> 409-6956). If you have any questions, would like to discuss a particular application, or <br /> require further information, please feel free to call with any questions or comments at <br /> (231)-941-7660. <br /> Attachments: <br /> Attachment 1: Survey Line Location Maps <br /> Attachment 2: Traffic Control Schematic and Flagger Method Diagram <br /> Attachment 3: Vibrator Vehicle Photograph <br />