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PAGE TWO BCC Agenda item from Michael D. Nixon, P.E., Roadway Production Manager February 5, 2013 r.- On January 23, 2011 the Florida Department of Environmental Protection concurred with semi-annual ground water monitoring but on an ongoing basis. Because some of the arsenic levels were above standards in some of the perimeter wells, the Florida Department of Environmental Protection required additional wells to be installed beyond the site limits (to confirm the limits of arsenic impacts in groundwater).Three additional wells were placed in the State Right-of-way of SR 510 and one additional well was placed on the western property line of the Cattle Dip Site. On November 19,2012 the Florida Department of Environmental Protection stated that because some of the arsenic levels are still above standards in some of the perimeter wells, additional wells are to be installed beyond the site limits (to confirm the limits of arsenic impacts in groundwater).Two additional wells are proposed. One is to be placed in the FDOT right-of-way and one is to be placed on private property west of the site. Because three wells have already been placed in the FDOT right-of-way,permission to place the fourth well is not anticipated to be an issue. The private property west of the County site is owned by DISNEY VACATION DEVELOPMENT INC.("Disney parcel'). The County will make the initial attempt to obtain permission to gain access to the Disney Parcel site. If the County is not successful the process will be turned over to the Florida Department of Environmental Protection who can place an Order on the property owner for the required access so the County can move forward with the well installation and ground water testing. The workwill be on hold until the Florida Department of Environmental Protection is successful acquiring permission to gain access on the Disney Parcel site. On February 1, 2013 Geosyntec Consultants, Inc. submitted a Groundwater Sampling Plan that included proposed locations for the two additional off site wells with sampling and testing. The Florida Department of Environmental Protection concurred with the revised plan. The total cost to date for Geosyntec Consultants, Inc. is $147,133.74. (Including the cattle dipping vat removal and soil excavation /remediation activities). Work Order No.6 to the Continuing Contract Agreement with Geosyntec Consultants, Inc.dated November 15,2011,will provide two additional monitoring wells with a single round of sampling as being required by the Florida Department of Environmental Protection. The proposed scope has been broken down into five separate tasks in a not—to-exceed amount of$20,784.82. The five tasks are as follows: Task 1—Preliminary Activities Task 2—Off-site access and ROW Notification Packages Task 3—Monitoring Well Installation Task 4—Monitoring Well Sampling Task 5—Site Assessment Report (See Geosyntec Consultants, Inc. Scope of Service with fee proposal in Exhibit B) Ongoing groundwater monitoring and reporting will likely be required by the Florida Department of Environmental Protection on a semi-annual basis. The ongoing monitoring and reporting is not part of this amendment.The estimated cost of future semi-annual monitoring and reporting is approximately$6,000 to $10,000 per year for an undetermined number of years. Monitoring will be required to continue until such time that the Florida Department of Environmental Protection determines that arsenic plume is stable and decreasing. At that time no further action will be requested. F:\Public Works\Capital Projects\CR 510\CR 510 Disney Parcel\GeoSyntec\BCC WO 6, 02-19-13.REVISEDdoc.doc 35