Okaloosa County BOCC — February 17, 2015 — TO44-BLF--FDEPapprovedRAP-MOD

TASK ORDER APPROVAL - conmraCT #:_ QDL 1353 - PWN2- 12 TASK ORDER #: 4'4" OFFERED BY CONSULTANT: SCS Enepneers FIRM'S NAME = /5(/‘/ Z A./CS'// REPRESENTATIVE S PRINTED NAME SIGNATURE %J'L?fi e efo = &J/Z.O/L_ TITLE RECOMMENDED FOR APPROVAL (Department Head/Director) /;;JO (s N TITLE 7 DATE DATE APPROVED BY OKALOOSA COU NTY e ,4- - "(7 SIGNATURE g/ Lo, TITLE 4@7«/& DATE' Environmentai Consultants ) 3298 Summit Boulevard 850 432-6211 and Contractors Suite 31-A FAX 850 432-6220 Pensacola. FL 32503 wWWw.scsengineers.com March 13, 2012 Proposal No. 090002212, Revision 2 Mz, Scott Henson Okaloosa County Public Works 1759 S. Ferndon Boulevard Crestview, Florida 32536 Subject: Proposal to Implement the FDEP-Approved Remedial Action Plan Modification Baker Landfill, Okaloosa County, Florida Dear Mr. Henson: SCS Engineers (SCS) is pleased to provide Okaloosa County {County) with this proposal and fee estimate to implement installation of various components of the Remedial Action Plan (RAP) modification (RAPMOD) for the Baker Landfill, prepared by SCS and dated August 1, 2011, and approved by the Florida Department of Environmental Protection (FDEP) on December 7, 2011. The RAPMOD approval by the FDEP indicates the actions proposed in the RAPMOD “represent a reasonable strategy toward accomplishing the cleanup objectives of Chapter 62-780, Florida Administrative Code (F.A.C). Our proposed scope of work to implement the RAPMOD is outlined in the sections below following a brief introduction and background. INTRODUCTION The RAPMOD implementation provides for modification and expansion of the recovery well system at the Baker Landfill (BLF), and includes implementation of limited monitored natural attenuation for the southern portion of the site, and corresponding modifications to the site monitoring plan. The groundwater recovery well system at the BLF has become more effective in capturing groundwater impacted by volatile organic compounds and iron due to sustained operation. The County and the FDEP have agreed that the current groundwater recovery well system can be enhanced to expand the capture zone and influence impacted groundwater beneath the waste disposal area of Baker East. Data from aquifer testing at the site in support of the RAPMOD, - suggests that the desired hydraulic control can be accomplished through the modification of the existing recovery system. BACKGROUND The Baker Landfill is composed of two closed landfill disposal areas generally referred to as Baker East and Baker West which combined will be referred to in this document as “the site.” The site status is classified by the FDEP as Post Closure Long Term Care (LTC) through permit number 0075982-004-SF (July 2008), renewed in July 2003 (Class I Landfill Closure Permit Renewal), and modified in March 2005. The March 2005 modification was primarily to add two Offices Nationwide ‘?%’ Mr. Scott Henson March 13, 2012 Page 2 compliance groundwater monitoring wells to the groundwater monitoring network: BCA-24, upper surficial aquifer; and B-1, lower surficial aquifer. Additional modifications were made to the permit in September 2008 and April 2010. September 2008 modifications included combining mercury monitoring reporting with iron and volatile organic compound (VOC) remedial effectiveness reporting. Additionally, reporting was modified to include information concerning volumes of recovered groundwater from each recovery well, system operation and maintenance with run times, and an explanation of any system down-time. April 2010 modifications included providing data with electronic data deliverables and adding boron and strontium to groundwater and leachate samples analysis. The current modified permit will expire July 28, 2013. The site is closed to incoming waste for final disposal, but operational Class 1 waste transfer and yard trash processing facilities are located on site. The site is undergoing active remediation in acco