Okaloosa County BOCC — January 6, 2015 — SCSTO45 NLF--VZAInjectionExtract--FullyExecuted — reading text

BOARD OF COUNTY COMMISSIONERS AGENDA REQUEST DATE: May 15,2012 TO: Honorable Chairman and Members of the Board FROM: John Hofstad, Public Works Director SUBJECT: Niceville Landfill- Vadose Zone Aeration Operation and Reporting DISTRICT: ALL REQUESTING DEPARTMENT: Public Works STATEMENT OF ISSUE: SCS Engineers has developed a proposal to perform the Phase I Vadose Zone Aeration (VZA) Pilot Tests of the Niceville Landfill (NLF). The work outlined in this proposal represents the activities required to execute the Pilot Study Work Plan (PSWP) submitted to and approved by the Florida Department of Envirorunental Protection (FDEP) in October 2009. These activities represent a portion of the PSWP to be completed in FY2012. BACKGROUND & ANALYSIS: Remediation of the NLF chemical impacts has been occurring through natural processes for many years. However, natural attenuation of chemical impacts as quantified by site data collected over the past decade is not sufficient to meet FDEP cleanup goals and was subsequently determined insufficient by the FDEP. In 2007, the FDEP urged the County to address chemical impacts more aggressively. The County began to actively investigate treatment alternatives rather than pursuing traditional and expensive technologies suggested by the FDEP. The County teamed with the University of Florida (UF) with the concurrence of the FDEP to implement a Pilot Study to determine the feasibility of a promising new technology called Vadose Zone Aeration. A Pilot Study Work Plan was generated and presented to the FDEP. Since the approval of the plan, the County has constructed the VZA system infrastructure, performed the initial startup/shakedown of the system and reported baseline findings. The system is now ready for full scale operation .. Costs for the planning, construction and implementation of the VZA system has been addressed in the budget cycles for the past few years. It was originally anticipated that UF would play the lead role in all phases of the project. However, County staff determined that a significant cost savings could be realized if the study effort was conducted by our existing contractor. In the current proposal, the UF's lead researcher, Dr. Tim Townshend, will serve as a consultant throughout the duration of the VZA implementation and assist in the preparation of required reporting. The County will also share data generated by the project with UF. This cost represents the lion's share of the study costs. Once this phase is complete, an evaluation of the system performance will determine whether the VZA technology is appropriate for full scale system operation. OPTIONS: The proposed work represents a sequential execution of the FDEP approved Work Plan .. Page I of2 RECOMMENDATION: The proposed cost ofthe FY2012 portion of the VZA Pilot Test is $182,000. This cost is budgeted for FY2012 in account number 4301-549305. Staff recommends that the Board sign the attached proposal for SCS in the amount of$182,000. PREPARED BY:......,Ji;""""_f/_/<._.-_.?_-' _J:.r_-- - - Scott R. Henson Public Works Project Manager Pagc2of2  TASK ORDER AUTHORIZATION CONTRACTNUMBER: C=0~6~-1=3~53~-~PW~2~-l=2~1________________________ i- TASK ORDER County, Florida #'~ VZA Injection & Extraction Operations, Niceville Landfill, Okaloosa OFFERED BY CONSULTANT: SCS Engineers FIRM'S NAME K. Mark Tumlin, MBA SIGNATURE DATE Vice President TITLE RECOMMEND FOR APPROVAL (Dep~~ John Hofstad, Public Works TITLE TITLE Environmental Consultants 3298 Summit Boulevard 850 432·6211 and Contractors Suite 31-A FAX 850 432·6220 Pensacola, FL 32503 www.scsenglneers.com SCS ENGINEERS May 7, 2012 Proposal No. 090286211- Revised Mr. Scott Henson Okaloosa CoWity Public Works 1759 S. Femdon Boulevard Crestview, Florida 32536 Subject: 2012 Vadose Zone Aeration (VZA Phase I) Injection & Extraction Operation, Niceville Landfill, Eglin Air Force Base, Niceville, Florida Dear Mr. Henson: SCS Engineers (SCS) is pleased to provide Okaloosa County (CoWity) with this proposal and cost estimate to continue the Phase I portion of Vadose Zone Aeration (VZA) pilot testing (extraction and injection) at the Niceville Landfill. Revisions are responsive to your comments on SCS' initial version of this proposal dated March 13, 2012. Revisions to this proposal include removal of the telemetry system upgrade, and the interim scale up feasibility analysis. The VZA system installation and pretesting has been completed during the initial portion of Phase I in preparation for extraction and injection operational testing. It is anticipated that this operational testing will be initiated within the Fiscal Year (FY) 2012, and carry over into early FY 2013. The objective of the operational VZA injection and extraction testing is to mechanically manipulate the geochemistry of the vadose zone between the landfill wastes and the groundwater with the intent to reduce the concentration of iron in the groundwater. Static vadose zone ahd groundwater background data, as well as system operation, respiration, and radius of influence data have been collected as a part of installing the VZA testing system at the site. These data indicate the apparent viability of performing VZA testing using the system (SCS report dated February 21, 2012). This proposal is intended to complete Phase I ofVZA testing and includes performing extraction and injection at the site using the VZA system). The testing will consist of consists of an approximatleyl 0-12 month of injection and extraction operation of the VZA system and an analysis of.the applicability of a full scale implementation'ofVZA at the site. This will complete Phase I of the testing and will lead to Phase II, the scale-up portion of the pilot testing. The following presents Background, Scope of Services, Total Estimated Fee, Schedule, Terms and Conditions, and Authorization for this proposal. Mr. Scott Henson Moy 7, 2012 Page 2 BACKGROUND Historical monitoring and assessment data collected from the site through Long Term Care permit monitoring requirements resulted in the County planning to develop a remedial action plan (RAP) for the site to address the presence of iron in groundwater. The County and the University of Florida (UF) partnered to design and conduct a pilot study at the site with the concurrence of the Florida Department of Environmental Protection (FDEP). The pilot study was designed to assess the effectiveness of VZA to reduce the concentration of iron in groundwater through the manipulation of geochemistry in the vadose zone beneath the landfill. As indicated in the County's correspondence to FDEP dated July 25, 2008, the objective of the study is the development and submission of a RAP for the site. The County retained SCS to facilitate, assist in further design. install, and perform the initial pilot testing of the site. The installation of the VZA system for the pilot testing was performed by SCS from June to October 2011 resulting in SCS' draft report of the fmdings dated January 20, 2012. Following installation of the pilot test system, preliminary testing of the system included baseline vadose zone vapor and groundwater data collection, and respiration and radius of influence testing. Baseline groundwater sampling on and adjacent to the site indicated the presence of iron in significant concentrations on site and immediately down gradient. The up-gradient location indicated relatively low concentrations of iron. It was concluded from these baseline data that the groundwater quality at the site potentially would respond to VZA testing. Results of the system start-up and shakedown testing indicated that the system could operate at flow ranges ranging from 4 standard cubic feet per minute (SCFM) to 50 SCFM. Respiration testing was conducted using helium as a tracer gas and air injection flow rate was established at 4 SCFM, with a 9% helium mixture added into the line for 24 hours prior to system shut-off. Readings indicated the presence of helium at the soil-gas probes located within the inner radius (S-1 through S-3; S-19 through S-21, and S-10 through S-12) extending out from the injection point (approximately 25 feet). Helium also was detected at soil-gas probes extending along the northwestern leg of the VZA system (S-4 through S-6, and S-7 through S-9). This leg of the VZA system has been identified as an area where the dividing clay unit begins to thin or "pinch- out." Results of the respiration testing indicated the site would respond to VZA testing. R4dius of influence testing also was conducted at three separate flow rates consisting of 10,30 and 50 SCFM. Pressure readings observed within the inner radius of soil-gas probes during the test protocol at 10 SCFM generally measured o· inches of water (in/H20). Pressure readings during the testing protocol at 30 SCFM exhibited slightly higher pressure readings in the soil-gas probes ranging from 0.3 to "0.4 in!H20, mid were primarily identified in probes S-3, and S-12. Pressure readings during tht: testing protocol at 50 SCFM remained similar to previous test results with readings ranging from 0.1 to 0.4 in!H2 0. These results further indicated that the site would respond to VZA testing. Mr. Scott Henson May 7, 2012 Page 3 The following Scope of Services, estimated fee, and schedule are intended to complete the VZA pilot testing of the site, potentially leading to scale up of the system in support of development of a RAP. Tills proposal includes the following components: • Project kick-off meeting. • Install an additional soil-gas probe cluster at the injection point to more accurately measure pressure and gas readings at the injection/extraction wells. • Replace and repair damaged vent wells on site. • Initiate injection and extraction testing. • Evaluate data. • Complete injection and extraction testing. • Conduct sampling activities. • Provide a report of activities and findings at the conclusion of testing. Attaclunent A provides the SCS estimated labor, equipment, materials, and reimbursable costs for each of the tasks discussed below. Note that Phase I does not include a final evaluation of the feasibility of scaling up the VZA to remediate the Niceville Landfill with respect to iron in groundwater. The scale-up evaluation will be performed in Phase II. SCOPE OF SERVICES SCS' proposed scope of services is presented in the following tasks. Tasks 1-2, and portions of Task 3 are anticipated to be completed during the Okaloosa County Fiscal Year (FY) 2012 (i.e., by September 30, 2012), while the remaining portions of Task 3 and Tasks 4-5 will be initiated during the FY 2012, and are anticipated to be completed during FY 2013. Estimated fees are listed in each task as detailed in the Attachment A. Task 1: FDEP Kick-Off Meeting, Preparation & RAI Response SCS proposes to conduct a project kick-off meeting at the FDEP Northwest District offices located in Pensacola, FL.· The purpose of the kick-off meeting will be to discuss the findings of the VZA system installation and pre~tests and confmn that FDEP is in agreement on the proposed method for implementing operational testing of the VZA system. SCS will prepare information to assist in facilitating the meeting, and has included time for preparation of a· response to one potential request for additional information (RAJ) derived