## [[Risk Action Plan]] ### [[Risk Description|Description]] Due to evolving process requirements identified during detailed design as the treatment system performance model is refined with site-specific operational data, there is a threat that the chemical feed system design may require significant modifications after the 60% design milestone, which may lead to cost increases, procurement delays for chemical feed equipment, and rework of completed design documents. > [!abstract]- Risk Analysis — Key Assumptions & Current Controls (click to expand) > > **Key Assumptions:** > - The 60% design chemical feed system is sized based on the process model developed during preliminary design; if the biological treatment process requires higher chemical dosing rates to meet permit limits under adverse conditions, the chemical storage, feed pumps, and piping may be undersized. > - Chemical feed equipment typically carries a 16–20 week lead time; any design change required after equipment procurement is initiated would likely require re-procurement and create a gap in the construction schedule. > - [[Star Road Engineering]]'s process model has not yet been validated against cold-weather operational data — this is the highest uncertainty in the current design basis. > > **Current Controls:** [[Toadette]] is conducting a parallel operational modeling review using actual cold-weather data from a comparable facility operated by [[EPIC Water Authority]] in a similar climate. [[Yoshi]] has flagged the chemical feed system design as a "hold item" in the design development log, meaning equipment procurement will not be initiated until the 90% design review is complete and the process model is validated. > [!abstract]- Sources of Information & References (click to expand) > > **Sources:** > - None — risk is internal to the design development process. > > **Attachments:** > - None ### [[Risk Mitigation Strategy]] REDUCE — [[Yoshi]] has established a chemical feed system design freeze gate at the 90% design milestone, requiring [[Toadette]]'s formal sign-off on process model validation before equipment procurement is authorized. This gate delays procurement by approximately 8 weeks relative to the original schedule but eliminates the re-procurement risk that would arise from a post-procurement design change. [[Star Road Engineering]] has been directed to size the chemical storage facility with 20% spare capacity to accommodate future dosing rate increases without requiring civil modifications, providing a long-term operational flexibility benefit. ### Possible Additional Actions - Commission an independent process review by a specialist firm with direct experience in biological nutrient removal at cold-climate facilities — this would provide a second opinion on the process model validity before the design freeze gate. - Evaluate modular chemical feed skid options that allow dosing capacity to be expanded through additional modules after initial construction, reducing the cost impact of any future capacity requirement that exceeds the initial design basis. ### Comments & Recommendations The chemical feed design risk is manageable through the established hold item and design freeze gate approach. The key dependency is [[Toadette]]'s operational modeling review — [[Yoshi]] should confirm that the comparable facility data sharing agreement with [[EPIC Water Authority]]'s operations team is formalized and that the data transfer is scheduled before the 90% design review date. ### Status - [ ] [[2026-02-26]] ^status-2026-02-26 - 🟡 **Modeling Progress:** [[Toadette]] completed cold-weather performance analysis using comparative facility data — results indicate current chemical feed pump sizing is adequate but sodium hypochlorite storage volume may need to be increased by 15% to maintain 30-day operational inventory during winter conditions. - 📅 **Design Freeze Gate:** 90% design milestone is now scheduled for April 15, 2026 — [[Yoshi]] confirmed the chemical feed hold item will be resolved before that date, with equipment procurement to be authorized within 5 days of approval. - [ ] [[2026-01-29]] ^status-2026-01-29 - ⚠️ **Data Gap Identified:** Comparable facility operational data received from [[EPIC Water Authority]]'s operations team — review by [[Toadette]] identified that January and February chemical dosing rates were 22% higher than the current design basis; investigating whether this is a facility-specific condition or indicative of a systematic design conservatism gap. - 🔄 **Hold Item Status:** Chemical feed equipment procurement remains on hold pending resolution of the dosing rate discrepancy; [[Yoshi]] confirmed that the procurement hold does not impact the construction critical path for at least 10 more weeks. > [!abstract]- Status History (click to expand) > > - [x] [[2025-11-01]] Risk identified during 60% design internal review — [[Yoshi]] noted that the process model had not been validated against cold-weather data and that chemical feed equipment was on the critical path for procurement; hold item placed on chemical feed equipment procurement and operational modeling review assigned to [[Toadette]]. ^status-2025-11-01