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Blast Vibration Analysis: Proposed MMRR Quarry Page 4 The BHCCSD Wastewater Treatment Plant holds Colorado Discharge Permit CO-0046761 issued by the Colorado Department of Public Health and Environment (CDPHE) that stipulates the terms and conditions of the plant's operations. The permit also specifies rigorous effluent discharge limits for physical and chemical wastewater parameters. Part II Section B of the permit specifically notes that "[F]ailure to comply with any terms and/or conditions of this permit shall be a violation of this permit" and that except in limited circumstances, "nothing in this permit shall be construed to relieve the permittee from civil or criminal penalties for noncompliance." Thus any condition that impacts, or has the potential to impact, the wastewater treatment plant is of critical importance to the BHCCSD. Continued, assured, safe, and compliant operation of the plant is a matter not only of environmental quality and conforming with its Colorado Discharge Permit limits, but a matter of public health as well. The plant discharges to a water course that is a drinking water source for nearly a quarter million persons in the greater Denver area. The following section will detail some of the individual sensitive receptors within the wastewater treatment plant. 12ECEPTORS Potentially sensitive receptors at the BHCCSD Wastewater Treatment Plant may be generally classified into two categories: instrumentation and physical plant equipment including rotating machinery, pipes, tanks (both freestanding and integral reinforced concrete), pumps, metering pumps, and LN disinfection. Instrumentation Instruments installed and integral to the operations of the BHCCSD Wastewater Treatment Plant monitor both water quality parameters (such as pH and DO) and process parameters (flow and tank volume). All the instruments exhibit some degree of sensitivity to their ambient environmental conditions including temperature, pressure, and shocklvibration. Shock and vibration can adversely impact sensors and instrumentation through 1) interruption or degradation of the signal due to the transient wave, 2) outright damage to the instrument or sensor, or 3) damage or misalignment caused by cumulative blast episodes. Such impacts could result in improperly treated wastewater being discharged to North C1eaz Creek. Depending on the magnitude and frequency of the blast, the blast-induced vibration transient may impact the signal producing a degraded or anomalous reading. The BHCCSD W astewater Treatment Plant is monitored and controlled in real-time through its SCADA system. An anomalous signal - nomatter how brief- may seriously impair instrument readings and subsequent equipment response. ©Leonard Rice Engineers, Inc. November 10, 2005 -Job No. 1086BCS03D