Create Supply Chain Logistics/distribution_center_operations.md

Supply Chain Logistics/distribution_center_operations.md

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+# Distribution Center Operations Manual
+**Document ID:** SC-DC-001 | **Version:** 4.2 | **Owner:** VP Supply Chain Ops
+**Effective:** 2025-01-01 | **Review Cycle:** Annual
+
+## 1. Purpose & Scope
+This manual governs the end-to-end operation of Walmart regional and
+e-commerce distribution centers (DCs), including inbound receiving,
+putaway, slotting, pick, pack, outbound staging, and loading. It applies
+to all associates, shift managers, and third-party logistics (3PL)
+partners operating within Walmart-controlled DCs.
+
+## 2. DC Network Overview
+Walmart operates 210+ distribution centers across the following types:
+
+| DC Type | Function | Typical Size | Service Radius |
+|---|---|---|---|
+| Regional DC (RDC) | Dry grocery & consumables | 800K–1.2M sq ft | 150–250 mi |
+| Food DC (FDC) | Perishables, chilled, frozen | 600K–1M sq ft | 150–250 mi |
+| Fashion DC | Apparel, soft goods | 400K–700K sq ft | 300 mi |
+| eCommerce FC | Direct-to-consumer fulfillment | 1M–1.5M sq ft | National |
+| Import DC | Port drayage & deconsolidation | 500K–900K sq ft | 400 mi |
+
+## 3. Inbound Receiving Procedures
+### 3.1 Appointment Scheduling
+- All inbound freight must have a scheduled dock appointment via the
+  **Yard Management System (YMS)** no less than **24 hours** in advance.
+- Suppliers who arrive unscheduled incur a **$250 late-arrival fee** and
+  may be turned away during peak hours (06:00–10:00, 16:00–20:00).
+- **Drop-and-hook** carriers must check in at the guard shack and receive
+  a yard slot within 15 minutes.
+
+### 3.2 Receiving Validation
+1. Scan trailer seal and verify against ASN (Advanced Shipping Notice).
+2. Confirm BOL (Bill of Lading) piece count against system PO.
+3. Inspect for damage, temperature deviation (cold chain), or infestation.
+4. Record discrepancies in **RDS (Receiving Discrepancy System)** within
+   30 minutes of unloading.
+5. Release trailer only after supervisor sign-off.
+
+### 3.3 Receiving Accuracy Targets
+| Metric | Target | Escalation Threshold |
+|---|---|---|
+| Receiving accuracy | ≥ 99.5% | < 98.5% |
+| Dock-to-stock cycle time | ≤ 4 hours | > 8 hours |
+| Trailer unload time | ≤ 90 min | > 3 hours |
+| Damage rate | ≤ 0.3% | > 0.8% |
+
+## 4. Putaway & Slotting
+### 4.1 Putaway Logic
+- **Golden zone** (waist height, 30"–60") reserved for high-velocity SKUs
+  with ≥ 20 picks/day.
+- **Reserve storage** for slow movers (< 5 picks/week) and bulk overflow.
+- **Forward pick** locations replenished when on-hand falls below 30% of
+  max capacity.
+
+### 4.2 Slotting Optimization
+- Slotting re-optimized quarterly using velocity, cube, and affinity data.
+- Affinity slotting: SKUs frequently co-picked placed within 15 ft of
+  each other to reduce travel time.
+- Slotting accuracy KPI: ≥ 97% of SKUs in correct velocity zone.
+
+## 5. Outbound & Loading
+- Outbound trailers loaded in **reverse-stop sequence** (last stop = first
+  loaded).
+- Trailer fill rate target: **≥ 92%** cube utilization.
+- Load quality audit: 1 in 20 trailers inspected; damage rate ≤ 0.2%.
+- Final seal applied and logged before trailer departs yard.
+
+## 6. Equipment & Safety
+- Powered industrial trucks (PIT) inspected pre-shift via checklist.
+- Pedestrian zones clearly marked; speed limit 5 mph inside DC.
+- Lockout/tagout (LOTO) procedure mandatory for conveyor maintenance.
+- Recordable incident rate (RIR) target: ≤ 2.8 per 100 FTEs.
+
+## 7. KPIs & Governance
+| KPI | Target | Owner |
+|---|---|---|
+| Cost per case | ≤ $0.42 | DC GM |
+| On-time outbound | ≥ 98% | Transportation Mgr |
+| Inventory accuracy | ≥ 99.7% | Inventory Control |
+| DC-to-store lead time | ≤ 24 hours | Supply Chain |
+
+## 8. Escalation Contacts
+- Tier 1: Shift Manager (on-site)
+- Tier 2: DC General Manager (within 30 min)
+- Tier 3: Regional Supply Chain Director (within 2 hours)
+- Tier 4: VP Supply Chain Ops (within 4 hours for network-impacting events)