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Home My WebLink About2007-363 WORK ORDER NUMBER 12 This Work Order Number 12 is entered into as of this day of ( -Io , 200 pursuant to that certain Continuing Contract Agreement for Professional Services entered into as of August 10 , 2004 and amended effective July 24 , 2007 (as so amended , the "Agreement") , by and between Indian River County Solid Waste Disposal District, a dependent special district of Indian River County, Florida ("District") and Geosyntec, Inc., a Florida corporation ("Consultant"). The District has selected the Consultant to perform the professional services set forth on Exhibit 1 , attached to this Work Order and made part hereof by this reference . The professional services will be performed by the Consultant for the fee schedule set forth in Exhibit 1 and within the timeframe more particularly set forth in Exhibit 1 , all in accordance with the terms and provisions set forth in the Agreement. Pursuant to paragraph 1 . 4 of the Agreement, nothing contained in any Work Order shall conflict with the terms of the Agreement and the terms of the Agreement shall be deemed to be incorporated in each individual Work Order as if fully set forth herein . IN WITNESS WHEREOF, the parties hereto have executed this Work Order as of the date first written above. GEOSYNTEC, INC . INDIAN RIVER. COUNTY /�l� f n SOLID T151ifSPOSAL DISTRICT Chairman Title: Vice President 10 Attest: JX6arto# , ,Cled< of Court gy Deputy Clerk pproved : h h A. Baird , County A inistrator ved a form sufficiency: n E. Fell , Assis ant County Attorney ® EXHIBIT 6.70 Sou th Washington Ao Suite 3 GeosMtec 32780 Titusv4lle. FL 32780 consultants 321 -269_SB&) 327 -269-5813 v ._X ' ) 'v Ili k rnn 1 7 September 2007 Himanshu Mehta, P . E. Managing Director Indian River County Solid Waste Disposal District 1325 74th Avenue SW Vero Beach, Florida 32968 Subject: Proposal for Remedial Action Plan Modification Implementation and Off- Site Monitoring Well Installation for the South Gifford Road Landfill Site ID# 124400 Vero Beach, Indian River County, Florida Dear Mr. Mehta: Geosyntec Consultants (Geosyntec) is pleased to submit this proposal to the Indian River County (IRC) Solid Waste Disposal District (SWDD) for activities associated with (i) implementation of the May 2007 Remedial Action Plan (RAP) Modification (with supplemental information); and (ii) the installation of an off-site monitoring well at the Cathco, Inc. property, as requested by the Florida Department of Environmental Protection (FDEP). The proposal also includes the installation of a third bio-barrier consisting of 32 injection wells, and the injection of 30 drums of electron donor solution in the additional wells, as specifically requested/required by the FDEP during our meeting in Orlando on 11 July 2007 . Geosyntec has prepared this proposal as Attachment 1 under Work Order No. 12 for the Continuing Contract Agreement for Professional Services between IRC SWDD and Geosyntec, dated 10 August 2004 (amended 24 July 2007). The remainder of this proposal presents : (i) general project background; (ii) proposed scope of work; (iii) budget estimate; and (iv) schedule. PROJECT BACKGROUND Based upon the discovery of chlorinated volatile organic compounds (CVOCs) in groundwater samples collected at the site in 1999 , Geosyntec has implemented ongoing assessment, semi- annual plume monitoring, and remediation activities, as required by the FDEP . Geosyntec X R07 192,/C C R 07069 DO C engineers I eIwnli is I innovators Himanshu Mehta, P .E. 7 September 2007 Page 2 submitted a RAP for the site in July 2003 , which outlined a remedy which consisted of aggressive source area excavation (including an area with dense non-aqueous phase liquid [ DNAPL] ), pump and treat (P&T), and natural attenuation monitoring for the downgradient dissolved plume. Based upon the results of post-source removal groundwater monitoring activities and an evaluation of natural attenuation processes, Geosyntec recommended in the June 2006 monitoring report that the existing P&T system, originally installed in 2001 as an interim measure, be permanently shut down. The P &T system was designed to provide hydraulic capture of the source area. With the source area removed via the excavation, the continued operation of the system was no longer justified . Additionally, the natural attenuation evaluation included in the June 2006 report demonstrated that anaerobic degradation processes are actively degrading the CVOC plume. In consideration of the ongoing natural attenuation processes occurring at the site, the enhancement of these biological processes via the injection of an electron donor was proposed, and agreed to in concept by the FDEP in correspondence dated 2 August 2006 . A RAP Modification was submitted to the FDEP outlining the injection of an electron donor, Emulsified Oil Substrate (EOS®) , in May 2007 . PROPOSED SCOPE OF WORK The proposed scope of work includes the activities required to implement the RAP Modification, including the installation of the proposed injection wells, the purchase of 79 drums (55-gallon capacity) of EOS'�), and the injection of 526 to 675 gallons of a 10 percent E00 solution to each of the 77 proposed injection wells. Additionally, one, 2-inch diameter monitoring well will be installed on the Cathco, Inc. property, as requested by the FDEP, and sampled for volatile organic compounds. The remainder of this letter provides details regarding the proposed scope of work and a budget estimate to accomplish the work described herein. Phase 1 — Preliminary Activities Phase 1 includes project management for the entire project, as well as preliminary activities associated with project planning and management responsibilities, such as correspondence with IRC SWDD, FDEP , IRC Department of Health, IRC Sheriffs Department (injection wells are proposed on the firing range property) , subcontracting, invoice review, project coordination, and project administration . XR07I 92iCCR07069DOC engineeis I m: iPntjsts I innmooms Himanshu Mehta, P . E . 7 September 2007 Page 3 Phase 2 — Injection and Monitoring Well Installations Phase 2 includes the activities associated with providing oversight to drilling subcontractors, as required, to install the proposed injection well network and the FDEP -requested off-site monitoring well to be located on the Cathco, Inc. property. The proposed drilling will include the following : • Transect One: Twenty-two, 1 -inch diameter injection wells screened from 40 to 50 ft below land surface (BLS) will be located in the current infiltration gallery. Eight of the original "vertical head dissipation wells" will be converted to injection wells, and 14 new injection wells will be installed . The injection wells will be completed with 2 ft by 2 ft by 4-inch thick concrete pads, 8-inch steel manholes, and locking caps. The injection wells will be installed using direct-push drilling techniques . • Transect Two : Twenty-three, 1 -inch diameter injection wells screened from 40 to 50 ft BLS will be installed along a transect in proximity to monitoring well MW07 . The wells will be spaced at approximately 6 . 6 ft to provide a continuous treatment barrier. The injection wells will be completed with 2 ft by 2 ft by 4-inch thick concrete pads, 8-inch steel manholes, and locking caps . The injection wells will be installed using direct-push drilling techniques . • Transect Three: Thirty-two, 1 -inch diameter injection wells screened from 40 to 50 ft BLS will be installed along a transect in proximity to monitoring well MW28B (located on IRC Sheriffs Department Firing Range). The wells will be spaced at approximately 8 . 9 ft to provide a treatment barrier. The injection wells will be completed with 2 ft by 2 ft by 4- inch thick concrete pads, 8-inch steel manholes, and locking caps. The injection wells will be installed using direct-push drilling techniques. • One, 2-inch diameter by 40 ft total depth monitoring well, with a screened interval from 30 to 40 ft BLS will be installed using hollow-stem auger drilling techniques at the Cathco, Inc. property. The monitoring well will be completed with a 2 ft by 2 ft by 4-inch thick concrete pad, 8-inch steel manhole, and locking cap . The monitoring well will be developed until visibly free of particulates/solids . XR07192/CCR07069DOC engineers I scientists I fnnos,nors Himanshu Mehta, P .E . 7 September 2007 Page 4 Any investigation derived waste (IDW), consisting of soil auger returns and development water, will be placed in 55 -gallon drums , labeled, and placed at the Gifford Road Landfill for disposal by IRC SWDD . Phase 3 — EOS® Injection EOS"' has been selected as the optimal electron donor for this site. Based upon calculations presented in the RAP Modification, EOS* will be injected by Geosyntec personnel as a dilute solution directly into the injection wells and will remain active in the subsurface for a period of up to five years. The EOS® dosage will consist of the injection of twenty-seven (27) 55 -gallon drums of EOSO solution at transect one, twenty-two (22) 55 -gallon drums of EOSt solution at transect two, and thirty ( 30) drums of EOSk solution at transect three. The EOS'0 solution will be diluted by a factor of ten with site groundwater, with the injection of approximately 520 to 670 gallons of solution to each well . The electron donor solution will be delivered to each injection location via a trailer-mounted injection system which includes a mixing tank and centrifugal pump connected to a manifold that includes individual flow meters, pressure gages, and ball valves. During the performance of the injection work at each location, information regarding the injection start time, finish time, volume injected, and injection pressure will be recorded by Geosyntec personnel . BUDGET ESTIMATE A budget estimate for the scope of work outlined above is $205 , 185 and a budget summary is included as Attachment 2. Geosyntec will not exceed the budget estimate without prior approval and written authorization from IRC SWDD. SCHEDULE Upon receipt of approval of the RAP Modification from FDEP , Geosyntec can be ready to initiate the field activities described herein within approximately four weeks, depending on subcontractor availability. We anticipate that the field activities will tentatively be conducted in October and/or November 2007 . A description of the baseline groundwater sampling, well installation, and dosing activities will be included in future semi -annual report(s) . XR07 f 92/CCR07069DOC engineers I scientists ! innommts Himanshu Mehta, P . E . 7 September 2007 Page S CLOSURE Geosyntec appreciates this opportunity to offer our services to IRC SWDD . If this proposal is acceptable, please indicate your agreement by signing the attached work authorization, which references this proposal . Please return one signed work authorization to Jim Langenbach ' s attention. Please call the undersigned with questions you may have as you review this proposal . Sincerely, - -/ Uk ( � � lror Jill W. Johnson, P . G. Project Hyd eologist aim ange bach, P .E . ss to Attachment 2 - Budget Summary Copy to : Nandra D. Weeks, P .E. XR07192/CCR07069DOC engineers I scientists I innncntw , Geosyntec Consultants Attachment 2 Summary of Estimated Costs Indian River County Solid Waste Disposal District RAP Modification Implementation/Monitoring Well Installation Pt oposat No. XR07192 Labor Direct External Phase Task Description Hours Labor Expenses Expenses Total Cost I Project Management/Securing Property Access 26 $3 ,962 . 82 $ 85 .20 $4,048 . 02 2 Injection Well/Monitoring Well Instal Iation( s) 253 $22, 391 . 64 $4,217 . 00 $ 153 , 009 . 84 $ 179 , 618 .48 3 EOS Injection Activities 209 $ 185462 . 48 $ 3 ,056 . 00 $21 , 518 . 48 'Total 53,01 1 5 Note: Subcontractor costs include a 7% markup. Attachment 2 XR07192 Page 1 of 1