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Phase II Environmental Site Assessment — Subsurface Investigation in NM/AZ

A Phase II ESA is required when a Phase I ESA identifies Recognized Environmental Conditions (RECs) — indicators of petroleum, hazardous substances, or other contamination requiring subsurface investigation. Phase II involves soil sampling, groundwater monitoring, and laboratory analysis.

When Phase II ESA Is Triggered

A Phase II investigation is triggered by Phase I findings or by lender requirements that specify Phase II regardless of Phase I findings for certain property types.

RECs Identified in Phase I
Recognized Environmental Conditions with a reasonable basis for concern — historical USTs, dry cleaner operations, fuel storage, industrial chemical use, or migration from adjacent contaminated sites.
Lender Requirements for High-Risk Property Types
Some lenders require Phase II for gas stations, dry cleaners, auto repair shops, industrial properties, or any property with prior commercial or industrial use — regardless of Phase I findings.
Regulatory Requirement
NMED or ADEQ may require Phase II as a condition of cleanup authorization, redevelopment approval, or site closure at a known contaminated property.
Precautionary Due Diligence
Buyers of high-value commercial properties may conduct Phase II proactively, particularly where ASTM-defined data gaps exist for historical industrial operations.

Phase II Methodology

Work Plan Development

  • REC-specific boring location design
  • Target analyte selection per contaminants of concern
  • Groundwater gradient determination
  • Regulatory notification (NMED/ADEQ) prior to drilling
  • Access agreement coordination with property owner

Field Investigation

  • Direct push technology (DPT) borings — minimal surface disturbance
  • Continuous soil core collection and logging
  • Groundwater monitoring well installation (if warranted)
  • Field screening with PID (photoionization detector)
  • GPS-referenced boring location mapping

Laboratory Analysis

  • NMED-certified laboratory submittals
  • Soil and groundwater analytical suites per REC
  • EPA standard analytical methods (8260, 8270, 6010, etc.)
  • QA/QC samples (trip blanks, field duplicates)
  • 4-10 business day standard turnaround

Report and Findings

  • Analytical results tabulation with regulatory screening levels
  • Contaminant concentration maps and cross-sections
  • NMED/ADEQ notification if action levels exceeded
  • Risk-based findings interpretation
  • Remediation recommendations if warranted

Common RECs Leading to Phase II — NM Context

Underground Storage Tanks (USTs)

Very common

Typical Phase II scope: Soil borings at tank corners, product line, dispenser islands. TPH, BTEX, MTBE analyses. Groundwater monitoring if soil impact detected.

NM has thousands of UST sites registered with NMED. Albuquerque automotive corridors (Central Ave, Coors Blvd) have high historical UST density.

Dry Cleaning Operations

Common in commercial corridors

Typical Phase II scope: PCE (tetrachloroethylene) targeted soil and groundwater investigation. Vapor intrusion pathway analysis per ASTM E1527-21 guidance.

NMED Groundwater Quality Bureau maintains dry cleaning site registry. Several Albuquerque strip mall properties have documented PCE impacts.

Petroleum Product Storage / Fuel Dispensing

Common in industrial

Typical Phase II scope: Similar to UST investigation — TPH, BTEX. Aboveground storage tank (AST) secondary containment failure investigation.

Petroleum distribution corridors near NM major highways and railroads commonly have AST residual impact.

Adjacent Contaminated Properties

Migration pathway RECs

Typical Phase II scope: Groundwater gradient analysis, monitoring well installation on upgradient side. Soil gas investigation for vapor intrusion.

NMED Superfund and RCRA Corrective Action sites can create migration RECs on adjacent parcels — NM sites include Kirtland AFB fuel spill plume.

NM and AZ Regulatory Requirements

New Mexico — NMED GQB

  • NMED Groundwater Quality Bureau notification if screening levels exceeded
  • Voluntary Remediation Program (VRP) enrollment for known contamination
  • NMED-certified laboratories required for all analytical work
  • Risk-Based Corrective Action (RBCA) cleanup levels based on future land use

Arizona — ADEQ WQARF

  • ADEQ Water Quality Assurance Revolving Fund (WQARF) notification requirements
  • Arizona AZPDES groundwater discharge permit coordination for dewatering during investigation
  • ADEQ registered environmental professionals for investigation work
  • Agua Fria WQMA specific requirements for Maricopa County sites

Remediation Planning — What Happens Next

A Phase II finding of contamination above NMED or ADEQ screening levels does not mean a property deal is dead or that a project is blocked. It means the contamination must be characterized and addressed through the regulatory process. Options include:

NMED Voluntary Remediation Program (VRP)
Enrolling in VRP provides a regulatory framework for cleanup with negotiated milestones and a No Further Action (NFA) letter at completion — which resolves lender concerns and provides liability finality.
Risk-Based Corrective Action (RBCA)
If the future land use does not create unacceptable risk from residual contamination (e.g., industrial land use adjacent to a petroleum plume), RBCA cleanup standards may allow closure without full remediation.
Transaction Adjustments
Contamination findings can be addressed through purchase price adjustment, escrow holdback, seller remediation obligation, or environmental insurance — all of which can be structured around a Phase II finding.
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