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<br />Facility Audit Report 19 <br />San Leandro WWTF <br />APPENDIX A: MONITORING AND TRENDING PLAN DETAILS <br />1. Download hourly samples of the SCADA historical data for both basins: airflows and <br />dissolved oxygen <br />2. Download hourly samples of the SCADA historical data for the blower system: electric <br />current for all 3 blowers, and aeration air supply system pressure <br />3. Make spot measurements of power and current at all three blowers to establish the <br />conversion for blower current measured in SCADA; Note the time and compare with the <br />SCADA readings for current <br />4. Install one test quality pressure gauge (0-20 psig, +/- 0.2 psi) in the air supply manifold <br />system pressure measurement point while the air flow is ramped across the normal <br />operating range; Record the corresponding SCADA airflows to establish the air flow vs. <br />pressure system curve