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o o Transit Mix Concrete Co. <br /> Sampling results indicate the water type at Little Turkey Creek is a calcium bicarbonate water. <br /> Hardness values were 66 milligrams per liter(mg/1) CaCO3 on June 16, 2015, 84 mg/I CaCO3 on <br /> August 26, 2015, 100 mg/i CaCO3 on November 16, 2015, and 71 mg/I CaCO3 on April 12, 2016. <br /> One exceedance of E. Coli occurred on June 16, 2015 with a result of 403 most probable <br /> number/100 milliliters (mpn/100ml). The segment 14d standard for E. Coli is 126/100ml. All other <br /> E. Coli results were below the 126/100ml standard. <br /> Field measured pH was 5.99 on November 16, 2015 and 6.44 on April 12, 2016. The stream <br /> standard for pH is 6.5-9.0. During the November 16, 2015 sampling event, the field meter was <br /> checked against a pH standard of 7.00 to confirm the 5.99 reading was not an error, with the <br /> meter reading the standard at 7.00. The laboratory pH value was 8.07 on November 16, 2015 <br /> and 7.95 on April 12, 2016, both within the 6.5-9.0 limit. All other constituents were within the <br /> segment 14d standard limits. <br /> c. Drainage Discussion <br /> Little Turkey Creek flows to the Arkansas River. Runoff from affected areas will flow through <br /> sediment basins before being discharged into Little Turkey Creek. Once this water is diverted <br /> back to Little Turkey Creek, Transit Mix will fully mitigate any possible impacts to the <br /> hydrological system. <br /> d. Surface Water Design <br /> Surface water will be diverted around the operation or flow through sediment basins to minimize <br /> impacts to surface waters. Control of sediment and flow volumes will be accomplished through <br /> the stormwater management control features. To control flow volumes, rates, and sediment <br /> discharge, a series of sediment basins with outlet controls and energy dissipation drop <br /> structures are used. These structures control the outflow volumes and are designed around a <br /> 100-year, 24-hour storm event for both the operational and reclamation periods. As the quarrying <br /> progresses, the stormwater management plan will be periodically reviewed and adjustment <br /> plans will be prepared and submitted to the Division for review and approval prior to <br /> implementation. It is likely that storms larger than the 100-year, 24-hour event will be controlled <br /> to some extent, but sediment loads and volumes from larger storms will probably exceed the <br /> capability of the system to provide full control. <br /> 4. Hydrologic Model <br /> Design of the channels and calculation of run off quantities were carried out following the <br /> methods required by the County, which has more stringent requirements than the Division. <br /> These calculations were performed using a combination of the Rational Method for watersheds <br /> less than 100 acres in drainage area and the curve number method using SEDCAD Version 4, <br /> a commercially available software package, for the remaining watersheds. Both methods <br /> Hitch Rack Ranch Quarry Permit Application <br /> October 3,2017 G-16 <br />