# Merrimac WRC Stormwater Compliance Business Case
> A detailed business case for upgrading stormwater infrastructure at Merrimac WRC to ensure regulatory compliance and environmental sustainability.

Tags: stormwater-management, environmental-compliance, waste-resource-centre, business-case, water-treatment, infrastructure-project, sustainability
## Merrimac WRC Stormwater Upgrade: Business Case
*   **Presenter:** Dominique Sleaford
*   **Date:** May 2026

## Background & Problem Statement
*   **Facility:** Merrimac Waste & Resource Centre (WRC).
*   **Issue:** Currently non-compliant with stormwater regulations (quality and quantity).
*   **Requirement:** Mandatory compliance within 18 months to avoid fines of $277,888/year.

## Project Scope
*   **In Scope:** Capture and treatment infrastructure, contaminant removal, detention/retention, EA amendment, and construction management.
*   **Out of Scope:** Broader STP Stage 6 civil works, potable water supply, and long-term O&M.

## Multi-Criteria Analysis (MCA) Results
*   **Option 1 (Do Nothing):** Score 2.2 - High risk, high fines.
*   **Option 2 (Quantity Only):** Score 3.0 - Partial compliance.
*   **Option 3 (Integrated Treatment):** Score 4.6 - Recommended. Full compliance for quantity and quality.
*   **Option 4 (Advanced + Reuse):** Score 3.8 - High cost/complexity.

## Financial Summary
*   **Option 3 Capex:** $620,000
*   **Avoided Fines:** $277,888/year
*   **10-Year NPV:** $771,485 (Lowest whole-of-life cost)

## Implementation Plan
*   **Month 0:** Funding approval and PM appointment.
*   **Months 1-7:** Detailed design and Environmental Authority (EA) amendment.
*   **Months 8-10:** Procurement and construction tender.
*   **Months 12-18:** Construction and commissioning.
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