18-3062 Brownfield CleanUp Project Agreement with Cardno - Amendment #3

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Chris Bowley City of Casselberry Page 2 September 14, 2018 Task 2 — Quarterly (PARM) Groundwater Monitoring (4 Events) Groundwater sampling at the Site is conducted on a quarterly basis. A full round of water levels is collected across the site prior to well sampling. After ambient groundwater conditions are established, ten monitor wells are currently sampled in accordance with FDEP SOPS (DEP- SOP-001/01) and the samples are submitted to a NELAC certified laboratory for analysis of volatile organic compounds (EPA Method 8260). However, an agreement was made previously with FDEP to eliminate analysis of semi -volatile organic (SVOC) compounds (EPA Method 8270) until the City was in a position to pursue site closure. As a result, Cardno is adding SVOC sampling and analysis to this proposal to support site closure after completion of PARM sampling. This proposal covers four quarterly sampling events. The initial PARM event is anticipated to occur in October 2018. Task 3 — Quarterly Post Active Remediation Monitoring Report Preparation Cardno will evaluate quarterly groundwater monitoring data and will prepare and submit the referenced PARM report to FDEP. All data will be maintained within the continually updated database system and will be presented in tables and figures within the reports. In addition to discussing the results and providing conclusions and recommendations, Cardno will present time versus concentration graphs for all key wells and will consider these data and the groundwater plume interpretations to document that the groundwater contaminant plume is stable or shrinking (a requirement of RMO 11 closure). Task 4 — Upgradient Well Installation FDEP has informed the City that an upgradient monitor well will be required to define the extent of contamination to the west of the current site, towards highway 17-92. It appears that the FDEP will accept a well located within the Melody Lane right of way, west of highway 17-92. Assuming that this location is acceptable, Cardno is providing a cost proposal for the installation of a 1 -inch diameter pre -pack monitor well to a depth of approximately 13 feet below land surface. This well has also been added to the cost proposals for subsequent quarterly sampling and reporting. COMPENSATION: The following cost estimates are provided as time and materials costs, however, they can be converted to lump sum costs, if this is preferred by the City. Task 1 — One Year O&M Cardno Labor, Materials, and Expenses Subcontractors/Equipment Rental: Equipment Rental ($600 x 12 months) .................. Utilities (electrical and phone) 1 year estimated .... SUBTOTAL.................................................................. G:\DES\ENV\Pro posa 1\2019\Casselberry\Revised G W Rem ed&QrtlyRpt_2019.docx $9,600 .$7,200 .$1,700 $18,500