Jan 18, 2022BoardMeeting
BoardWater Quality Appeals Board Reporter's Transcript
The Water Quality Appeals Board hearing discussed the assessment of stream geometry and hydraulics, assuming a peak discharge of 5400 gallons per minute from the outfall. Measurements of infiltration rates were conducted at five different sites at various distances from the outfall on Harshaw Creek, as well as at two seeps upgradient of the outfall. These measured values were compared to literature values from the U.S. Army Corps of Engineers and NRCS for infiltration values. Grain size analysis was performed using a Federal Highway Administration's hydraulic toolbox to estimate the grain size gradation, concluding that the material was coarse-grained sand and gravel with little or no fines in the matrix.