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Response to DTSC Comments Operations and Maintenance Plan March 9,2017 Page 3 of 4 Comment Comment Response No. Section 9.4.2 Excavation Procedures.The term "RAW"should be defined and a reference to The first use of RAW has been defined in Section Comment where the RAW can be found should be added to 1.0 as well as the first use in Section 9.4.2. 10 the text.Alternatively,the requirements of the Footnotes have been added with web hyperlinks to Air Monitoring Plan can be repeated in the Plan document locations on Envirostor. appendices. Section 9.4.2 Excavation Procedures.The fourth Section 9.4.2 Excavation Procedures.The sentence states that excavation areas will be sentence in question now reads: Prior to sprayed with enough water to minimize dust commencement of excavation activities, Comment generation.The text should be modified to excavation areas will be sprayed with enough 11 include limiting the amount of water used for water to minimize dust generation as necessary dust suppression so as not to transport but will be limited such that contaminated soil is contaminated soil from the excavation area not transported through runoff or other means. through runoff or other means. Section 9.7 Reporting Requirements.The last Section 9.7 Reporting Requirements. The sentence Comment sentence regarding updating the Plan and SMP has been modified to read: This SMP and O&M 12 should be revised to include"and written Plan should be considered a living document and concurrence by"in addition to consultation with updated when conditions change in consultation DTSC. with and written concurrence by DTSC. Appendix D,Quality Assurance Project Plan for Removal Action.This appendix is meant to serve as a quality assurance project plan for sampling related to the operations and Appendix D, Quality Assurance Project Plan for maintenance phase of the remedy. Sections 1-3 Removal Action. Appendix D has been removed Comment refer to the original excavation project and are from the Plan as the information is already 13 not relevant to operation and maintenance included in the main text of the Plan. Additional activities for the encapsulation area.These language has been added to Section 9.5. sections should be revised to reflect the current project(maintenance of the implemented remedy).We note that most of this information is already included in the main text of the Plan. �.M� CONDOR