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Mr. Mike Nixon 30 November 2009 Page 4 Geosyntec consultants The current cost breakdown of the monitoring well installation assumes only six monitoring wells will be required to document delineation of the arsenic groundwater impacts. An additional 100% contingency has been added to Task 2 to cover any additional monitoring well installations required to achieve arsenic groundwater delineation. Geosyntec will notify IRC and secure approval for any activities that may require access to contingency fees. Geosyntec's proposal assumes one day of oversight for the monitoring well installations, one and a half days of oversight for the monitoring well sampling, and a half a day for completing the "windshield survey" for the water supply well survey described below. A breakdown of estimated project costs is included as Attachment B. Task 3 — Water Supply Well Survey Geosyntec will perform a "water supply well survey" in an attempt to identify and obtain information on area water supply wells, as required under Chapter 62-780.600(3)(h) F.A.C. This survey will focus on locating public water supply wells located within 0.5 -miles of the facility boundary and private water supply wells (including irrigation wells) located within 0.25 -miles of the facility boundary. The goal of the survey is to ascertain whether or not the site is located within proximity to supply wells in the area which could be affected by the arsenic impacts and/or could affect area groundwater flow. The following subtasks will be performed: • coordinating with IRC to request and obtain information on County water supply wells located in the area; • contacting the St. Johns River Water Management District, the local health department, and IRC utilities, to request information on permitted supply wells located in the area; • performing a "windshield survey" from public roads to look for evidence of private water supply wells (to be completed during the monitoring well sampling event described above) within 0.25 -miles of the facility boundary; and • determining whether the Site is located within an established regulated wellhead protection zone of a public water supply well or well field. Additionally, Geosyntec will attempt to identify adjacent surface water bodies which could be potentially affected by or influence onsite contamination. XR09305/CCR09108. DOC engineers I S-cieTlt14ts I llil ol) iio