# 📐  L2 Spec — Groundwater Contaminant Transport Inversion — Nominal + Mismatch Specs

**ID:** `L2-425-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-425`](/artifact/l1/L1-425)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41555242

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| N wells | — | 5 – 200 |
| Log k variance | — | 0.5 – 6.0 |
| Domain area km2 | — | 0.01 – 100 |
| Contamination years | — | 1 – 100 |

## 2. Tolerance (ε)

**Type:** `fn`

```
0.05 + 0.05 * (log_K_variance / 2.0) ** 0.5
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |

## 4. Fingerprint

`36f96b2853134c725e9652e7e228b5457f165d621e52eb546492ab3d811fa86c`

## 5. On-chain Registration

- **Chain hash:** `0x50797919449705b43c345ef417dc6975357922b43aa3303423e6cfda32576472`
- **Chain tx hash:** `0xc723a20489713dbed82d03ef14f4337421ccc6d21c93944bae9437118806b9fd`
- **Chain block:** `41555242`

---

## File Mapping

This bundle consists of: `L2-425-001.md`, `L2-425-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-425-001.md` | Source of truth — edit this | Human or LLM |
| `L2-425-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-425-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._