# Phase I Esa

> Drafts ASTM E1527-21 environmental site assessment reports under 40 CFR Part 312. Classifies RECs, CRECs, and HRECs to establish all appropriate inquiries for CERCLA liability protection. Trigger when the user requests a Phase I ESA, environmental site assessment, recognized environmental conditions analysis, ASTM E1527 compliance, or environmental due diligence for property transactions or lending.

- Skill: `lev-os/phase-i-esa` (Agent Skill)
- Install (CLI): `npx skillmds@latest add lev-os/phase-i-esa`
- Raw SKILL.md: https://api.skillmd.com/api/skills/lev-os/phase-i-esa/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: lev-os (https://skillmd.com/u/lev-os)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/lev-os/phase-i-esa

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# Phase I Environmental Site Assessment Report

Drafts a Phase I ESA establishing "all appropriate inquiries" under ASTM E1527-21 and 40 CFR Part 312 for CERCLA liability protection.

## Prerequisites

Collect before drafting:

1. **Property identification** — legal description, address, APN, coordinates, zoning
2. **Client purpose** — acquisition, lending, corporate compliance, or other
3. **Site reconnaissance data** — date, observations, photos, access limitations
4. **Historical sources** — aerial photos, fire insurance maps, city directories, topo maps
5. **Regulatory database results** — federal/state/tribal/local at ASTM search radii
6. **User questionnaires** — owner/occupant questionnaires per ASTM E1527-21
7. **Interview notes** — current/past owners, operators, local officials
8. **EP qualifications** — credentials per 40 CFR § 312.10
9. **Prior reports** (if any) — previous Phase I/II ESAs, remediation docs

## Quick Start

1. Confirm property ID, client purpose, and transaction timeline.
2. Verify all prerequisite data is available; flag missing items as data gaps.
3. Draft each report section sequentially per the structure below.
4. Classify every identified condition as REC, CREC, HREC, or de minimis.
5. State conclusions unambiguously; recommend Phase II if any RECs found.

## Report Sections

| # | Section | Key Requirements |
|---|---------|-----------------|
| 1 | Title Page | Property legal description, address, APN, coordinates; preparer info; report/effective dates; client; project ID; confidentiality notice |
| 2 | Table of Contents | All sections, appendices, figures, tables with page refs |
| 3 | Executive Summary | 2-3 pages max; non-technical; state RECs/CRECs/HRECs or explicitly none; scope; data gaps; recommendations |
| 4 | Introduction & Scope | Client purpose; ASTM E1527-21 conformance statement; inclusions/exclusions; non-scope items evaluated |
| 5 | Site Description | Acreage; structures; USTs/ASTs; topography; surface water; current operations; surrounding area (1-mi radius); geology/hydrogeology |
| 6 | User-Provided Information | Questionnaire responses; completeness/credibility assessment; data gaps from non-response |
| 7 | Historical Use Review | Timeline from first developed use or 1940 (whichever earlier); aerial photo analysis (5-10 yr intervals); adjoining property history |
| 8 | Site Reconnaissance | Date/duration/weather; interior/exterior observations; drains, sumps, staining, drums, tanks, PCB equipment; access limitations |
| 9 | Interviews | Each interviewee: name, title, affiliation, contact, date, method; substantive findings; credibility assessment |
| 10 | Regulatory Records | Results at required search distances; orphan site analysis; data gap discussion |
| 11 | Findings: RECs/CRECs/HRECs | Each condition with factual basis, evidence sources, ASTM classification |
| 12 | Conclusions & Recommendations | Unambiguous determination; Phase II recs if warranted; data gap implications; counsel referral for liability |
| 13 | De Minimis & Non-Scope | De minimis conditions; non-scope items (ACM, LBP, radon, mold, wetlands); vapor intrusion evaluation |
| 14 | References | All sources by category with full citations |
| 15 | EP Qualifications | Credentials per 40 CFR § 312.10; education, certifications, experience |
| 16 | Appendices | Site maps, photos, questionnaires, database reports, historical docs, prior reports |

## Condition Classifications

| Type | Definition | Must Include |
|------|-----------|-------------|
| **REC** | Presence or likely presence of hazardous substances/petroleum due to release, indicative conditions, or material threat of future release | Factual basis; evidence sources; contaminant ID |
| **CREC** | Past release addressed via risk-based corrective action with residual contamination under institutional/engineering controls | Residual contamination; specific controls; regulatory status; monitoring requirements |
| **HREC** | Past release remediated to unrestricted use; no residual contamination or controls | Historical condition; remediation performed; regulatory closure docs |

## Regulatory Database Search Distances

| Database | Subject | 1/8 mi | 1/4 mi | 1/2 mi | 1 mi |
|----------|:---:|:---:|:---:|:---:|:---:|
| NPL | ✓ | ✓ | ✓ | ✓ | ✓ |
| CERCLIS/SEMS | ✓ | ✓ | — | ✓ | — |
| RCRA CORRACTS | ✓ | ✓ | — | — | — |
| RCRA TSD | ✓ | — | — | ✓ | — |
| RCRA LQG/SQG | ✓ | ✓ | — | — | — |
| ERNS | ✓ | — | — | — | — |
| State equivalents | ✓ | Per state | Per state | Per state | — |
| Landfill/solid waste | ✓ | — | — | ✓ | — |

## Historical Use Red Flags

Flag current or historical presence of: gas stations, automotive repair, dry cleaners, metal plating/finishing, chemical manufacturing/storage, printing/photo processing, fill placement/waste disposal, agricultural operations (pesticides).

## CERCLA Shelf-Life

- **Full Phase I**: valid **1 year** from completion to acquisition
- **Site reconnaissance**: within **180 days** prior to acquisition
- **Government records review**: update if **180+ days** old at acquisition

## Pitfalls and Checks

1. **Conformance statement** — explicitly declare ASTM E1527-21 conformance; document any deviations
2. **REC classification precision** — use exact ASTM definitions; never conflate REC types
3. **Evidence-backed findings** — every REC must cite specific observations, records, history, or interviews
4. **Data gaps** — identify all; assess significance; recommend resolution
5. **No legal advice** — direct liability questions to environmental counsel
6. **Non-invasive scope only** — never imply subsurface sampling was performed
7. **Point-in-time limitation** — acknowledge the assessment reflects conditions as of assessment date
8. **State-specific requirements** — note state guidelines that exceed federal standards
9. **Vapor intrusion** — evaluate for any property near known groundwater contamination; assess as potential REC
10. **Facts vs. opinions** — clearly distinguish; state basis for professional judgment
11. **De minimis threshold** — conditions below regulatory concern are not RECs; document but classify appropriately
12. **Non-scope items** (ACM, LBP, radon, mold, wetlands) — only if client requests; separate from REC analysis