| VER-METHODS-001 | Verify IFC-DEFS-001: Test — inject water at maximum flow rate (50 ML/d) with alum feed at 120 L/hr. Confirm check valve holds 150% of line pressure without backflow. Verify anti-siphon air gap breaks vacuum when pump stops. Pass: zero backflow detected at alum storage; injection quill flow confirmed at ±5% of setpoint. | — | verification, chemical-dosing, alum, session-207 |
| VER-METHODS-002 | Verify IFC-DEFS-002: Test — inject polymer solution with tracer dye at flocculation stage inlet. Measure tracer distribution at 1, 3, and 5 seconds downstream. Pass: 90% tracer dispersion achieved within 5 seconds of injection as measured by fluorometer at three sampling points. | — | verification, chemical-dosing, polymer, session-207 |
| VER-METHODS-003 | Verify IFC-DEFS-003: Test — operate ejector with motive water at 400, 500, and 600 kPa. Measure chlorine solution concentration and flow at each pressure. Verify uniform distribution by sampling residual at 6 points across contact tank cross-section at 1m downstream. Pass: coefficient of variation of residual concentration < 15% across sampling points. | — | verification, chemical-dosing, chlorine, session-207 |
| VER-METHODS-004 | Verify IFC-DEFS-004: Test — inject caustic soda at maximum dose rate with plant at design flow. Sample pH at 5 and 10 pipe diameters downstream of static mixer. Pass: pH variation between any two sample points < 0.1 pH units at 10 diameters downstream. | — | verification, chemical-dosing, caustic, session-207 |
| VER-METHODS-005 | Verify IFC-DEFS-005: Test — simulate pump status changes, dose rate adjustments, tank level variations, and analyser alarms at the chemical dosing PLC. Confirm all signals appear on SCADA within 2 polling intervals (2 seconds). Pass: 100% of 50 test signals received correctly at SCADA with timestamp latency < 2 seconds. | — | verification, chemical-dosing, scada, session-207 |
| VER-METHODS-006 | Verify IFC-DEFS-006: Test — inject calibration gas at 1.5 ppm to each of the 6 chlorine detection points sequentially. Measure time from detector alarm to SCADA annunciation via hardwired path. Repeat with Modbus link disconnected to confirm hardwired independence. Pass: all 6 detectors annunciate at SCADA within 500 ms; alarms function identically with Modbus disconnected. | — | verification, chemical-dosing, safety, session-207 |
| VER-METHODS-007 | Verify IFC-DEFS-007: Inspection and Test — inspect Hastelloy C-276 injection quill and PVDF tubing material certificates against specification. Verify 2-metre minimum separation from caustic injection point by measurement. Test with acidified water (pH 2.0) for 24 hours and inspect for corrosion or precipitation. Pass: material certs confirmed; separation ≥ 2m; no visible corrosion or precipitation after acid exposure test. | — | verification, chemical-dosing, fluoride, session-207 |
| VER-METHODS-008 | Verify SUB-REQS-004: Test — inject calibration gas at 1.5 ppm concentration to each chlorine detector. Record timestamp of detection threshold crossing and timestamp of cylinder valve closure confirmation (limit switch). Pass: all cylinder valves confirmed closed and scrubber running within 5 seconds of first detector alarm at each test point. | — | verification, chemical-dosing, chlorine, safety, session-207 |
| VER-METHODS-009 | Verify SUB-REQS-005: Test — measure exhaust airflow with calibrated anemometer at chlorine room exhaust duct. Calculate air changes per hour from measured flow rate and room volume. Verify negative pressure with differential pressure gauge at doorway. Pass: measured ACH ≥ 20; room pressure at least 25 Pa below adjacent corridor. | — | verification, chemical-dosing, ventilation, session-207 |
| VER-METHODS-010 | Verify SUB-REQS-011: Test — with duty pump running at steady-state, simulate pump fault by tripping motor contactor. Measure time from fault to standby pump reaching commanded speed. Verify SCADA receives switchover alarm. Repeat for each chemical feed system. Pass: standby pump at speed within 30 seconds; SCADA alarm received for all test cases. | — | verification, chemical-dosing, redundancy, session-207 |
| VER-METHODS-011 | Verify IFC-DEFS-008: Test — measure flow at UV inlet header with portable ultrasonic flowmeter and compare with electromagnetic flowmeter reading at 25%, 50%, 75%, and 100% of design flow. Verify UVT spectrophotometer reading against laboratory UV-254 analysis of grab samples. Pass: flowmeter agreement within ±1%; UVT agreement within ±1% transmittance. | — | verification, disinfection, filtration, session-207 |
| VER-METHODS-012 | Verify IFC-DEFS-009: Test — with chlorine injection operating at design dose, sample chlorine residual at 6 points across the contact tank inlet cross-section at 1m inside the baffled zone. Pass: coefficient of variation of chlorine residual < 20% across sampling points, confirming adequate pre-mixing. | — | verification, disinfection, contact-tank, session-207 |
| VER-METHODS-013 | Verify IFC-DEFS-010: Test — apply known chlorine standards (0.5, 1.0, 2.0, 4.0 mg/L) to each of the 5 analysers and verify SCADA displays updated value within 2 seconds. Simulate sample flow loss and confirm discrete alarm at SCADA. Pass: all 5 analysers read within ±0.05 mg/L of standard; all sample loss alarms received within 2 seconds. | — | verification, disinfection, scada, session-207 |
| VER-METHODS-014 | Verify IFC-DEFS-011: Test by operating the sedimentation and filtration subsystems at peak hydraulic loading. Measure flow distribution to each filter cell via individual effluent flowmeters. Pass criteria: total flow within 5% of 900 m3/hr, settled water turbidity below 2 NTU at all sampling points under normal conditions. | — | verification, filtration, sedimentation, session-208 |
| VER-METHODS-015 | Verify IFC-DEFS-012: Inspect motorised butterfly valve and electromagnetic flowmeter installation on each filter effluent pipe. Demonstrate valve operation and flowmeter calibration. Pass criteria: valve stroke time under 60 seconds, flowmeter accuracy within 1% of reading, combined header capacity confirmed at 900 m3/hr. | — | verification, filtration, treated-water, session-208 |
| VER-METHODS-016 | Verify IFC-DEFS-013: Conduct backwash flow test on each filter cell. Measure backwash flow rate via Venturi flowmeter at pump speeds from 50% to 100%. Pass criteria: flow rate 800 to 1000 m3/hr, supply pressure 12 to 18 m head, Venturi accuracy within 2% of volumetric reference measurement. | — | verification, filtration, backwash, session-208 |
| VER-METHODS-017 | Verify IFC-DEFS-014: Conduct air scour distribution test on a drained filter cell with media removed. Measure air flow at multiple underdrain orifice sample points. Pass criteria: air delivery 1400 to 1600 Nm3/hr, supply pressure 0.4 to 0.6 bar gauge, variation across floor area within 10% of mean velocity. | — | verification, filtration, air-scour, underdrain, session-208 |
| VER-METHODS-018 | Verify IFC-DEFS-015: Test Modbus TCP communication between each Filter Control Panel and the SCADA server. Confirm all register mappings for turbidity, headloss, flow, valve positions, and filter status. Pass criteria: all data points update within 1 second, command response time under 500 ms, no data loss over 24-hour continuous test. | — | verification, filtration, scada, session-208 |
| VER-METHODS-019 | Verify IFC-DEFS-016: Simulate signal loss on 4-20 mA speed demand to backwash pump. Confirm fail-safe behaviour. Test all discrete I/O signals for correct mapping. Pass criteria: pump stops within 2 seconds of signal loss, all discrete signals confirmed correct per I/O schedule, valve positions match commanded states. | — | verification, filtration, backwash, control, session-208 |
| VER-METHODS-020 | Verify IFC-DEFS-017: Test filter-to-waste flow path by operating filter-to-waste valve at full filter production rate. Confirm non-return valve closes against backflow. Pass criteria: gravity flow sustained at 150 m3/hr, non-return valve holds against 1 m static head from waste holding tank. | — | verification, filtration, filter-to-waste, sludge, session-208 |
| VER-METHODS-021 | Verify IFC-DEFS-018: Test air scour interlock by attempting blower start with filter water level below media surface setpoint. Confirm blower does not start. Raise water level above setpoint and confirm blower starts normally. Pass criteria: blower start inhibited 100% of low-level attempts, blower starts within 5 seconds of level permissive. | — | verification, filtration, air-scour, interlock, session-208 |
| VER-METHODS-022 | Verify IFC-DEFS-019: Conduct hydraulic commissioning test with flocculated water at peak flow. Measure velocity at 6 points across the distribution channel cross-section. Pass criteria: maximum channel velocity below 0.3 m/s, velocity variation within 10% of mean. | — | verification, sedimentation, inlet, session-208 |
| VER-METHODS-023 | Verify IFC-DEFS-020: Test settled water quality and flow distribution at peak plant capacity. Measure settled water turbidity at each basin outlet and flow to each filter cell via effluent flowmeters. Pass criteria: settled water turbidity below 2 NTU, flow variation between filter cells within 5% of mean. | — | verification, sedimentation, filtration, session-208 |
| VER-METHODS-024 | Verify IFC-DEFS-021: Test sludge withdrawal from each hopper during normal desludge cycle. Measure sludge solids concentration and flow rate. Pass criteria: sludge concentration 2 to 3 percent solids, withdrawal flow up to 50 m3/hr per hopper, mud valve opens and closes within 10 seconds of command. | — | verification, sedimentation, sludge, session-208 |
| VER-METHODS-025 | Verify IFC-DEFS-022: Test by commissioning flow measurement at Raw Water Intake–Rapid Mix interface across 50% to 110% design flow. Pass: inlet turbidity value appears on SCADA within 5 seconds of grab-sample comparison. | — | verification, coag-floc, session-209 |
| VER-METHODS-026 | Verify IFC-DEFS-023: Inspection of injection quill material certificate (Hastelloy C-276) and test of alum flow measurement accuracy at 25%, 50%, 75%, and 100% of maximum rate. Pass: measured flow within ±2% of commanded rate at all test points. | — | verification, coag-floc, session-209 |
| VER-METHODS-027 | Verify IFC-DEFS-024: Measure head loss across Rapid Mix–Flocculation transfer at design flow using differential pressure transducers. Pass: head loss does not exceed 50 mm at any flow up to 110% of design. | — | verification, coag-floc, session-209 |
| VER-METHODS-028 | Verify IFC-DEFS-025: Measure approach velocity at flocculation outlet to sedimentation inlet using tracer dye study at design flow. Pass: velocity does not exceed 0.3 m/s at any measurement point. | — | verification, coag-floc, session-209 |
| VER-METHODS-029 | Verify IFC-DEFS-026: Inject known SCI signal from calibration source and confirm SCADA data log records values at 1-second intervals with alarm triggering within 2 seconds of threshold exceedance. Pass: all logged values match calibration within ±0.05 SCI units. | — | verification, coag-floc, session-209 |
| VER-METHODS-030 | Verify IFC-DEFS-027: Simulate pH deviation and measure time from detection to caustic soda dose rate change initiation. Pass: response time does not exceed 10 seconds across 5 repeated trials. | — | verification, coag-floc, session-209 |
| VER-METHODS-031 | Verify IFC-DEFS-028: Visual inspection of gravity channel dimensions and velocity measurement using propeller flow meter at design flow. Pass: velocity does not exceed 0.6 m/s. | — | verification, raw-water-intake, session-209 |
| VER-METHODS-032 | Verify IFC-DEFS-029: Dimensional survey of flow meter installation confirming 5D straight run and meter calibration test at 25%, 50%, 75%, 100% of range. Pass: accuracy within ±0.5% of reading. | — | verification, raw-water-intake, session-209 |
| VER-METHODS-033 | Verify IFC-DEFS-030: Inject test signals on each raw water quality parameter and confirm SCADA receives and logs values within 5 seconds. Verify Modbus RTU polling at configured interval. Pass: all parameters visible on SCADA within specification. | — | verification, raw-water-intake, session-209 |
| VER-METHODS-034 | Verify IFC-DEFS-031: Test by connecting representative field instruments (turbidimeter, flow meter, pH analyser) to PLC I/O and confirming signal accuracy within 0.1% of calibrated range. Verify bus loading does not exceed 95% with all instruments online. Pass criteria: all instruments report within ±0.25% of reference standard and bus utilisation remains below 95%. | — | verification, scada, session-210 |
| VER-METHODS-035 | Verify IFC-DEFS-032: Test by disconnecting one fibre link on each PLC and confirming network failover completes within 50 ms with no loss of process data. Pass criteria: PLC maintains communication with SCADA server during single-link failure; no alarm generated for data loss. | — | verification, scada, session-210 |
| VER-METHODS-036 | Verify IFC-DEFS-033: Test by timestamping a PLC register change and measuring time to historian storage. Verify with 800+ configured tags polling at 1-second intervals. Pass criteria: end-to-end latency from PLC scan to historian write does not exceed 500 ms for 99% of samples over a 24-hour test period. | — | verification, scada, session-210 |
| VER-METHODS-037 | Verify IFC-DEFS-034: Test by injecting a simulated alarm condition at the PLC and measuring elapsed time to HMI alarm pop-up display. Pass criteria: alarm annunciation appears on all operator workstations within 2 seconds of PLC detection for 100% of injected alarms across 50 test cycles. | — | verification, scada, session-210 |
| VER-METHODS-038 | Verify IFC-DEFS-035: Test by confirming compliance data appears on the reporting gateway within 1 minute of SCADA server update. Verify DMZ firewall blocks all traffic except the read-only OPC-UA endpoint. Pass criteria: data latency under 60 seconds; penetration test confirms no inbound connections cross DMZ. | — | verification, scada, session-210 |
| VER-METHODS-039 | Verify IFC-DEFS-036: Inspect PLC I/O rack allocation against point schedule. Verify 20% spare capacity by counting used vs total I/O slots in each rack. Pass criteria: every process area PLC has at least 20% unused I/O capacity documented in the as-built point schedule. | — | verification, scada, session-210 |
| VER-METHODS-040 | Verify IFC-DEFS-037: Test by simulating utility failure and measuring transfer time from generator ready signal to load energisation. Verify mechanical interlock prevents simultaneous closure of utility and generator breakers. Pass criteria: transfer completes within 2 seconds; interlock test confirms lockout in 10 consecutive trials. | — | verification, electrical-power, session-210 |
| VER-METHODS-041 | Verify IFC-DEFS-038: Analyse protection coordination study confirming time-graded discrimination between MCC incomer and downstream starters. Inject simulated fault currents at MCC bus. Pass criteria: fault clearance at MCC incomer within 200 ms; downstream starter trips before incomer for faults beyond starter. | — | verification, electrical-power, session-210 |
| VER-METHODS-042 | Verify IFC-DEFS-039: Test by disconnecting UPS input and confirming uninterrupted power to critical loads. Verify static bypass transfers load within one half-cycle. Pass criteria: zero interruption to SCADA servers during input loss; bypass transfer time under 10 ms. | — | verification, electrical-power, session-210 |
| VER-METHODS-043 | Verify IFC-DEFS-040: Test by commanding motor start/stop from PLC and confirming status feedback within 500 ms. Verify VFD speed setpoint tracks PLC command within 2% across operating range. Pass criteria: I/O response within 500 ms; speed accuracy within 2% of setpoint at 25%, 50%, 75%, and 100% speed. | — | verification, electrical-power, session-210 |
| VER-METHODS-044 | Verify IFC-DEFS-041: Inspect gravity pipeline gradient and diameter. Test by measuring sludge flow rate during basin desludging. Pass criteria: achieves 50 m3/hr flow with no pipeline blockage over 30-day commissioning period; sludge solids at receiving tank confirmed at 2-3% by grab sample. | — | verification, sludge, session-210 |
| VER-METHODS-045 | Verify IFC-DEFS-042: Test by running a full filter backwash cycle and measuring flow volume and peak flow rate to sludge holding tank. Pass criteria: total volume per backwash event within 180-220 m3; flow meter readings agree with tank level change within 5%. | — | verification, sludge, session-210 |
| VER-METHODS-046 | Verify IFC-DEFS-043: Test by operating the progressing cavity pump across its speed range and confirming thickened sludge feed rate tracks setpoint within 10%. Verify inline density meter reads within 0.5% of laboratory analysis. Pass criteria: feed rate 10-25 m3/hr controllable; density measurement agrees with lab within 0.5% solids. | — | verification, sludge, session-210 |
| VER-METHODS-047 | Verify IFC-DEFS-044: Test by operating return pumps at maximum rate while monitoring headworks inflow. Simulate return turbidity exceeding 50 NTU and confirm automatic shutoff activates. Pass criteria: return flow does not exceed 10% of concurrent inflow; shutoff triggers within 30 seconds of turbidity exceedance. | — | verification, sludge, session-210 |
| VER-METHODS-048 | Verify IFC-DEFS-045: Inspect pipeline diameter and inlet distribution arrangement. Conduct tracer test (rhodamine or lithium chloride) through the clear well to confirm T10/T ratio exceeds 0.5 for CT compliance. Pass criteria: 900 mm pipeline installed; tracer test T10/T ratio >= 0.5. | — | verification, treated-water, session-210 |
| VER-METHODS-049 | Verify IFC-DEFS-046: Test by isolating one clear well cell and confirming pumps draw from the remaining cell without cavitation or pressure drop below NPSH required. Pass criteria: all pumps operate at rated flow from single cell with NPSH margin >= 2 m. | — | verification, treated-water, session-210 |
| VER-METHODS-050 | Verify IFC-DEFS-047: Calibrate Woltman flow meter against portable ultrasonic flow meter at 25%, 50%, 75%, and 100% of design flow. Test pressure sustaining valve setpoint. Pass criteria: flow meter accuracy within ±1% of reading; pressure sustaining valve maintains setpoint within ±10 kPa. | — | verification, treated-water, session-210 |
| VER-METHODS-051 | Verify IFC-DEFS-048: Test each analyser's 4-20 mA signal against PLC register by applying known calibration standards. Verify remote calibration initiation from SCADA HMI. Pass criteria: signal accuracy within ±0.5% of span; remote calibration completes successfully for all analysers. | — | verification, treated-water, session-210 |
| VER-METHODS-052 | Verify SUB-REQS-003: Test — with chlorine system operating at maximum withdrawal rate, create a controlled downstream leak by loosening a union at the ejector. Confirm vacuum is maintained (no chlorine gas release) using portable chlorine detector at leak point. Measure vacuum at cylinder regulator outlet: pass criterion is sustained vacuum >5 kPa below atmospheric at all points downstream of the regulator during simulated leak. | — | verification, chemical-dosing, safety, session-211 |
| VER-METHODS-053 | Verify SUB-REQS-013: Test — conduct bioassay validation per USEPA UV Disinfection Guidance Manual using MS2 coliphage at flow rates of 100, 150, and 200 L/s per reactor and UVT values of 75%, 85%, and 95%. Measure delivered UV dose via biodosimetry. Pass criterion: validated reduction equivalent dose not less than 40 mJ/cm2 at each test condition with UV sensor readings correlated to biodosimetry within ±10%. | — | verification, disinfection, session-211 |
| VER-METHODS-054 | Verify SUB-REQS-014: Test — conduct step-dose tracer study using lithium chloride or rhodamine WT at design flow in each chlorine contact tank. Measure tracer concentration at outlet at 30-second intervals. Calculate T10 (time for 10% of tracer to pass outlet). Pass criterion: T10/T ratio not less than 0.65 and theoretical HRT not less than 15 minutes per tank at design flow. | — | verification, disinfection, session-211 |
| VER-METHODS-055 | Verify SUB-REQS-036: Test — measure power draw and water temperature at flows of 580, 725, and 870 L/s. Calculate velocity gradient G = sqrt(P/(mu*V)) where P is measured mixing power, mu is dynamic viscosity at measured temperature, and V is chamber volume. Pass criterion: G value between 600 and 1000 s-1 at each flow rate, with detention time between 15 and 30 seconds. | — | verification, coagulation, session-211 |
| VER-METHODS-056 | Verify SUB-REQS-045: Test — operate each raw water pump individually at 50%, 75%, and 100% VFD speed. Measure flow via calibrated electromagnetic meter. Confirm 3-duty configuration delivers 580-870 L/s total. Verify standby pump auto-starts within 30 seconds of a simulated duty pump trip. Pass criterion: each pump delivers rated flow within ±5% at commanded speed; total station output spans required range. | — | verification, raw-water-intake, session-211 |
| VER-METHODS-057 | Verify SUB-REQS-049: Test — with primary SCADA server operating under typical load (all PLCs polling, historian recording, 3 HMI sessions active), disconnect the primary server network interface. Measure failover time from primary disconnect to secondary assuming full data service. Pass criterion: failover completes within 5 seconds, zero data loss confirmed by comparing historian timestamps across the transition. | — | verification, scada, session-211 |
| VER-METHODS-058 | Verify SUB-REQS-060: Test — simulate utility power loss by opening the main breaker. Measure time from loss of voltage to diesel generator reaching rated voltage (415 V ±5%) and frequency (50 Hz ±2.5%). Measure ATS transfer time from generator ready to load on. Pass criterion: generator ready within 10 seconds of power loss, ATS transfer within 3 seconds of generator ready. | — | verification, electrical, safety, session-211 |
| VER-METHODS-059 | Verify SUB-REQS-066: Test — with plant running on emergency diesel generation, confirm disinfection (UV reactors and chlorine dosing), SCADA system, and raw water pumping remain energised and operational. Verify non-essential loads (administrative building HVAC, external lighting) are shed. Pass criterion: all priority loads operational within 15 seconds of diesel assuming load; shed loads confirmed de-energised. | — | verification, electrical, safety, session-211 |
| VER-METHODS-060 | Verify SUB-REQS-068: Test — feed thickened alum sludge at 2%, 3%, and 4% solids to belt filter press at design throughput of 25 m3/hr. Sample dewatered cake at belt discharge and measure solids content by gravimetric method (APHA 2540G). Pass criterion: cake solids not less than 18% w/w at each feed concentration, polymer consumption not exceeding 5 kg/dry tonne. | — | verification, sludge-handling, session-211 |
| VER-METHODS-061 | Verify SUB-REQS-076: Analysis — conduct hydraulic transient analysis using Method of Characteristics model of the distribution system including pump trip, valve closure, and demand variation scenarios. Pass criterion: maximum transient pressure at any point in the system does not exceed 150% of steady-state working pressure, and minimum transient pressure remains above -50 kPa (no column separation). | — | verification, distribution, session-211 |
| VER-METHODS-062 | Verify SUB-REQS-078: Test — with all PLCs in normal operation, disconnect the SCADA server and network backbone. Confirm each area PLC continues local control by verifying process variable trends remain within setpoint bands. Measure scan cycle time using PLC diagnostic registers: pass criterion not exceeding 100 ms. After 1 hour, restore network and confirm SCADA data synchronisation completes within 30 seconds with no data gaps in historian. | — | verification, scada, degraded-mode, session-211 |
| VER-METHODS-063 | Verify IFC-DEFS-049: Test — inject tracer dye through PAC injection quill at maximum feed rate (50 mg/L at design flow). Measure tracer arrival time at the coagulant injection point to confirm minimum 2-second separation. Inspect injection quill position relative to alum injection quill. Pass criteria: tracer-measured contact time not less than 2 seconds at design flow; quill positioned upstream of alum injection as per P&ID. | Test | verification, chemical-dosing, session-213 |
| VER-METHODS-064 | Verify SUB-REQS-009: Inspection — measure secondary containment sump volume for each liquid chemical storage area against 110% of the largest single tank volume. Verify liner chemical resistance per manufacturer datasheet against stored chemical compatibility. Test sump pump interlock by raising sump level above alarm setpoint and confirming stormwater discharge valve closes. Pass criteria: sump volume confirmed at 110% of largest tank; liner rated for stored chemical; discharge valve closes within 5 seconds of high-level alarm. | Inspection | verification, chemical-safety, session-213 |
| VER-METHODS-065 | Verify SUB-REQS-015: Test — inject known chlorine residual standards at the CT outlet sampling point while operating at design flow. Configure 90% CT alarm threshold. Verify CT calculation updates at 15-minute intervals using validated T10 and measured residual. Simulate low-residual condition and confirm alarm generation. Pass criteria: calculated CT agrees with manual calculation within 5%; alarm triggers within 60 seconds when achieved CT falls below 90% of required value. | Test | verification, disinfection, session-213 |
| VER-METHODS-066 | Verify SUB-REQS-030: Test — drain filter cell to below media surface level. Attempt to start air scour blower from both local and SCADA. Confirm blower does not start. Refill cell above media surface and confirm blower starts normally. Repeat 5 times to confirm interlock reliability. Pass criteria: blower start inhibited in 100% of low-level attempts; blower starts within 5 seconds of level permissive confirmation. | Test | verification, filtration, session-213 |
| VER-METHODS-067 | Verify SUB-REQS-023: Test — initiate backwash on a filter cell and allow return to service. Continuously monitor individual filter effluent turbidity during ripening. Confirm filter-to-waste valve remains open until turbidity is continuously below 0.15 NTU for 15 minutes. Verify diverted water reaches backwash waste holding tank. Pass criteria: no filtered water with turbidity above 0.15 NTU enters the clearwell during filter ripening; filter-to-waste valve holds open for full 15-minute qualification period. | Test | verification, filtration, session-213 |
| VER-METHODS-068 | Verify SUB-REQS-055: Test — conduct network penetration test verifying VLAN isolation between process areas. Attempt cross-VLAN traffic and confirm it is blocked. Verify DMZ firewall rules between OT and IT networks by attempting connections from IT to OT zones. Inspect managed switch port-level access control configurations. Pass criteria: zero cross-VLAN traffic passes without explicit firewall rules; no inbound OT connections from IT network; all switch ports configured with 802.1X or MAC-based access control. | Test | verification, scada, cybersecurity, session-213 |
| VER-METHODS-069 | Verify SUB-REQS-062: Test — with plant operating on primary 11 kV feed, simulate voltage sag to 85% on active feed. Measure time from voltage sag detection to bus transfer completion. Verify mechanical interlocking prevents simultaneous closure of both incomer breakers. Repeat test with complete loss of voltage. Pass criteria: bus transfer completes within 100 ms; mechanical interlock confirmed in 10 consecutive trials; no load interruption exceeding 100 ms during transfer. | Test | verification, electrical, session-213 |