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Kimley-Horn and Associates,Inc. Exhibit A to Amendment Number 1, dated January 9, 2013 Project Understanding In response to the Florida Department of Environmental Protection's(FDEP)December 11,2012 correspondence, Kimley-Horn and Associates, Inc. (KHA) will conduct additional ground water sampling at the Shadowbrook Estates Site (the "Site"). The Consultant shall perform the following Additional Services: Task 1—Ground Water Sampling The existing monitoring wells at the Northeast Grove and Southwest Grove will be re-sampled for total dissolved solids, arsenic and/or lead. Ground water sampling will be performed in accordance with the FDEP's Standard Operating Procedures. KHA will provide notification to the FDEP's Southeast District 48-hours prior to commencement of the ground water sampling. Depth to ground water measurements will be made and recorded for each monitoring well prior to sampling.The depth to ground water at each monitoring well will be measured with an electronic water level meter. Additionally, water level measurements will be recorded at the upstream and downstream benchmarks established for the canal along the western side of the Site. The water level measurements will ultimately be used to establish the localized direction of ground water �... flow across the Site. Prior to sampling, each of the monitoring wells will be purged to facilitate collection of representative samples from the water-bearing formation. The monitoring wells will be purged using a peristaltic pump and low-flow techniques. Throughout the purging process, field parameters will be measured and recorded on ground water sampling logs. The measured field parameters will include pH, specific conductivity, dissolved oxygen, oxidation/reduction potential,and turbidity. Ground water samples will be collected from each monitoring well once the field parameter readings have stabilized indicatnig that fresh formation water is entering the monitoring well. The ground water samples will be collected in laboratory supplied containers with the appropriate preservatives.Following collection,the ground water samples will be placed on ice and prepared to transport to the designated laboratory under chain-of-custody protocol. As noted in KHA's October 16, 2012 letter to the FDEP,the ground water across the site contains elevated concentration of tannins which impart elevated turbidity of the ground water samples. As such, both total and dissolved metals samples will be collected from the Site. The dissolved metals samples will be collected using a dedicated; 1.0-micor in-line filters pursuant to the FDEP's SOP DEP-SOP-001/01 FS 2225. At the Northeast Grove area ground water samples will be collected from monitoring wells NEG- MWAR, NEG-MW-1 Deep, NEG-MW-2, NEG-MW-3 and NEG-MW-4. The corresponding ground water samples will be analyzed for total dissolved solids and total and dissolved arsenic. The eleven monitoring wells at the Southwest Grove area: SWG-SHW-1, SWG-SHWMW- IDEEP, SWG-MW-1, SWG-MW-2, SWG-MW-3, SWG-MW-4, SWG-MW-5, SWG-MW-6, SWG-MW-7, SWG-MW-100,and SWG-MW-101, will be analyzed for total dissolved solids and total and dissolved arsenic and lead. In addition to the 17 ground water samples, QA/QC samples 40