Pacific Southwest, Region 9: Superfund

Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations

Montrose Chemical Corp

Superfund Site

Record of Decision for Dual Site Groundwater Operable Unit Montrose Chemical and Del Amo Superfund Sites

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VOLUME I: Declaration and Decision Summary

Declaration (with Title Page, Contents, and Acronyms List) -

(314K)

Decision Summary

Section 1: Site Names and Location -

(95K)

Section 2: Site History and Background -

(838K)

Section 3: Community Highlights -

(124K)

Section 4: Context, Scope and Role of the Remedial Action -

(526K)

Section 5: Major Documents -

(80K)

Section 6: Definition of the Term Joint Site -

(99K)

Section 7: Summary of Site Characteristics -

(2.3M)

Section 8: Summary of Groundwater-Related Risks -

(987K)

Section 9: Remedial Action Objectives -

(243K)

Section 10: Technical Impracticability Waiver and Containment Zone -

(723K)

Section 11: Description and Characteristics of Alternatives -

(1M)

Section 12: Comparative Analysis of Alternatives &
Rationale for Selected Alternative -

(301K)

Section 13: Specification of the Selected Remedial Action:
Standards, Requirements, and Specifications -

(334K)

Section 14: Statutory Determinations -

(136K)

Section 15: Documentation of Significant Changes -

(70K)

Appendices -

(234K) -

A: Identification of Applicable or Relevant and Appropriate Requirements

B: Explanations Pertinent to the Approach to Characterization of Intrinsic
Biodegradation for the Benzene and Chlorobenzene Plumes

VOLUME II

Response to Oral Comments Received During the Public Meeting
(with Title Page, Contents, List of Acronyms, and Introduction to Volume II -