Okaloosa County BOCC — January 6, 2015 — SCSTO44-BLF--FDEPapprovedRAP-MOD — reading text

TASK ORDER APPROVAL CONTRACT#: c.t>""- \~S3 - flN2.-l21 TASK ORDER #: * _ OFFERED BY CONSULTANT: Sc..3 'EV\j:""eerS FIRM'S NAME REPRESENTATIVE'S PRINTED NAME / /!~ ~ Jc-J?L/: SIGNATURE tf2±/-G-c:;/r ,d,,.,-,,, c./-.. ..-- TITLE DATE RECOMMENDED FOR APPROVAL (Department Head/Director) P~a~d}yk6 ~rJ . fk;.mth.. TITLE TITLE Environmental Consultants 3298 Summit Boulevard 850432-6211 and Contractors Suite 31 ~A FAX 850 432-6220 Pensacola. FL 32503 www.scsengineers.com March 13,2012 Proposal No. 090002212, Revision 2 Mr. 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 I, 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 moclification 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 Pa ge 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 20 1O. September 2008 modifications included combining mercury monitoring reporting with iron and volatile orgauic 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 accordance with a RAPMOD to recover and treat low level VOCs and iron in the upper and lower surficial aquifers. SCOPE OF SERVICES SCS' proposed scope of services is presented within the following tasks. Each of the Tasks (I- 8), are anticipated to be completed during the Okaloosa County Fiscal Year (FY) 2012 (i.e., concluding September 30, 2012), while the potential may exist for operations and maintenance (O&M) tasks to be completed during FY 2013. Estimated fees are listed in each task as detailed' in the Attachment A. Task 1 - Logistics, Correspondence, and Management SCS will coordinate and correspond with the .FDEP in an effort to streamline the project activities. FDEP correspondence is assumed to include one (I) on-location meeting at the Northwest District in Pensacola, FL, and up to two additional teleconference meetings regarding the status of implementation of the RAP Mod. Task 1 will also include project and sub-contractor scheduling activities throughout the project as well as project management activities. Progress reporting also will be captured under Task 1. Task 1 Estimated Fee: $4,800 Task 2 - Heallh /I< Safety Plan SCS will review and update the Health and Safety Plan (HASP) previously prepared for the Baker Landfill monitoring well sampling and oversight tasks. Modifications will be required to take into account the recovery well installation and excavation activities and address on-site gas monitoring. This task will include: • Review current HASP relative to current and proposed site conditions. Mr. Scott Henson Morch13,2012 Po ge 3 ~ Identify new hazards and related risks from existing and proposed changed conditions. 5 Update HASP accordingly. • Perform on-site health and safety monitoring. Following completion of the updated HASP, SCS will produce copies of the HASP for distribution to the project team and all on-site personnel. This task also will include discussing the presence, content, and application of the HASP with existing and new personnel arriving on- site. The task fees are centered around utilization of an SCS staff engineer/geologist because it is anticipated that over the course of the RAP MOD implementation scope, this individual will give daily tailgate safety briefmgs, which are fee elements included in this task. Also included is a fee for supplies, which will be used for such items as safety flagging, printed materials, and other safety needs that may arise during the execution of the Scope of Services. An additional component of the site health and safety activities will be to conduct air monitoring for landfill gas during excavation activities using our in-house hand held GEM landfill gas analyzer. SCS proposes to be on-site during excavation activities conducted by the County to perform monitoring using a GEM 2000 Plus monitor for potentially dangerous landfill gases including H2S, methane, and carbon dioxide. Task 2 Estimated Fee: $4,100 Task 3 - Permitting Recovery wells RW-8 and RW-9 were installed as temporary aquifer test monitoring wells during the hydraulic testing activities conducted in advance of the RAP MOD Addendum. RW- 8 and RW-9 will be incorporated into the overall recovery well system regime and will need to be permitted as aquifer restoration wells with the Northwest Florida Water Management District (NWFWMD), under Chapter 40A-3, Florida Administrative Code (FAC). In addition to RW-8 and RW-9, the proposed RW-10 also will need to be permitted as an aquifer restoration well with the NWFWMD. In accordance with the NWFWMD Rule 40A-2.092, Florida Administrative Code (FAC), the Baker Landfill is located within consumptive use permitting area "C". Permitting requirements associated with Area "C"; according to Rule 40A-2.041 FAC, are limited to: 1) groundwater withdrawal exceeding 1.4 million gallons per day (mgpd); or 2) groundwater withdrawal is obtained from one or more wells measuring 10-inches in diameter (or larger); or 3) the groundwater withdrawal is for community public supply or bottled water use. Based on the information outlined in the rule, the activities to be conducted at the Baker Landfill do not meet the criteria; therefore, a consumptive use permit will not be required at this time. Task 3 Estimated Fee: $2,700 Mr. Scott Henson March 13, 2012 Pa ge 4 Task 4 - Site Survey SCS will coordinate surveying at the BLF and retain a professional land surveyor to perform horizontal and vertical surveying of the newly installed monitoring wells BCA-47S and BCA- 47D. In addition to surveying the recently installed monitoring wells, SCS also will coordinate surveying the proposed recovery well (RW)-l0 and additional piezometer, as well as the discharge pipeline line for RW-I0. Surveying of the RW-I0 pipeline will be performed following installation of the line by the county and will include horizontal and vertical surveys of the top edges of the cleanouts along the pipeline. Task 4 Estimated Fee: $6,500 Task 5 - Installation of Recovery Well (RW)-10 As part of the RAP Mod implementation, and based on previous groundwater modeling efforts conducted at the BLF, an additional recovery well RW-lOis proposed to be installed within the upper surficial aquifer to increase the remediation system capture zones. It is anticipated that RW-10 will have construction similar to RW-8, the next closest recovery well. However, this task includes performing natural gamma ray borehole geophysical logging to assist.in confirming the interval for the screened portion ofRW-10. As part of the well installation task, SCS proposes to conduct a step-drawdown test on RW-I0. The step-drawdown test is a single well pump test designed to assess the performance of the well versus the performance of the formation under controlled variable discharge conditions. In conducting the step test, the discharge rate in the pumping well is increased from an initially low constant rate through a sequence of pumping intervals (steps) of progressively higher pumping rates. Each test will typically be equal in duration, and could last up to two hours per test. Each step will be conducted for sufficient duration to allow dissipation of wellbore storage effects. The main goal of the step-drawdown test is to estimate hydraulic properties (i.e., transmissivity and hydraulic conductivity), in addition to well loss and well efficiency. Conducting this test will allow SCS to confirm that the newly installed RW-IO will be able to adequately meet the required pumping rate of 50 gallons per minute (as established in previous aquifer modeling efforts). In addition to installing RW-IO, a separate piezometer will be installed east of State Road SR-4 and also will be gamma ray logged to confirm screen setting. The primary objective is to optimize the hydraulic containment system to bring the Site into compliance with water quality standards. This well will be installed under separate existing task order funds and is not included in fees associated with this proposal. Task 5 Estimated Fee: $21,500 Mr. Scott Henson March 13,2012 Page 5 Task 6 - Reporting Upon completion of the RAP MOD implementation activities, SCS will prepare a report to be submitted to the County and FDEP detailing the activities undertaken during the implementation field efforts and the effectiveness ofthe operational recovery well system. Two optional tasks have been included and are outlined below which will allow SCS to conduct various installation oversight activities as well as system start-up and shakedown activities. These optional