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Again, though typically with land use projects an operation could not proceed until all public <br />improvements have been installed, a phased implementation of improvements has fairly been <br />considered and offered professional support by the County. <br />Further, the phased schedule is intended to allow an immediate hauling allowance of 80 average/96 <br />maximum haul trucks/day (160 one-way trips); however, 100 haul trucks/day prior to identified, timely <br />and predictable road improvements being installed, is not supportable. <br />As summarized in Table 1, in 2012 GCC initially proposed an operation that would grow to produce <br />approximately 120 haul trucks/day (240 one-way trips) by the year 2022. However, in July 2015, GCC <br />amended its proposed haul truck volume to an average of 156/day. Based upon the various studies, <br />accident reports and GCC's refusal to agree to the scheduled improvements identified, staff is of the <br />opinion that 156 average haul trucks/day (312 one-way trips) on a public road shared with residential <br />and general traffic is incompatible with the standards outlined in LPLUC Sec. 82-193. The initially <br />communicated 120 average haul trucks (240 one-way trips) remains the highest considerable threshold <br />for possibly achieving general compatibility; and when measured improvements are conjunctively <br />proposed (such as has been expressed within the draft RIA mentioned earlier). <br />In practice, during its peak year to date of 2014, GCC hauled 94 loaded trucks/day (averaged across 362 <br />days). This equates to 110 loaded haul trucks/day if averaged across 310 haul days (which would be the <br />case with hauling suspended on Sundays). The single day with the highest level of operation in 2014 <br />produced 136 loaded haul trucks leaving the facility (272 one-way trips). <br />Table 8 shows the relative impact of volume on truck spacing, with 2014 equivalent values provided for <br />reference. With an average volume of 110 loaded haul trucks/day leaving the facility (220 one-way <br />trips), any point along the transport route experiences a truck passing once every 5.5 minutes during, the <br />day and once every 11 minutes at night, on average. <br />Table 8. Spacing of Transport Trucks, One -Way Trips, (in minutes) <br />Loaded <br />60 <br />80 <br />100 <br />(2014) <br />120 <br />140 <br />156 <br />Avg Day <br />110 <br />One -Way Trips <br />120 <br />160 <br />200 <br />220 <br />240 <br />280 <br />312 <br />(Empty or Loaded) <br />Daytime spacing' <br />10 <br />7.5 <br />6 <br />5.5 <br />5 <br />4.3 <br />3.8 <br />Nighttime spacing2 <br />20 <br />15 <br />12 <br />11 <br />10 <br />8.6 <br />7.7 <br />(1) Day time spacing assumes 80% of daily traffic occurs over 16 hours from 6am to 10pm <br />(2) Night time spacing assumes 20% of daily traffic occurs over 8 hours from 10pm to 6am <br />Other mitigation efforts would be necessary for consideration during a permit issuance as well, such as: <br />1. Hauling is suspended on Sundays to provide a day of respite for the residential uses along the <br />chosen haul route. <br />2. The monthly average of haul trucks, excluding Sundays, be limited to 120/day. <br />3. The maximum single -day of haul truck volume/load not to exceed 144/day (20% above the <br />monthly average). <br />4. To minimize night-time hauling and associated safety (and noise) impacts, a minimum of 80% <br />total haul trucks to run between 6 am and 10 pm. <br />Project No. 2012-0089 PC <br />4852-5627-2942, v. 3 <br />Page 20 of 32 <br />(DM, VS, DP) <br />