2019-753-E Solid Waste - Draper Aden Nature and Extent Study

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Mr. Bruce Woody October 2, 2019 Page 2 of 3 Budget. The cost of providing the proposed services shall be $4,800 [Lump Sum]. The need to implement this task was not anticipated; therefore, we did not include the cost of this task when preparing the budget for fiscal year 2019-2020. The cost of the proposed services is based upon a review of the effort associated with preparing prior NES reports for other solid waste facilities. Deliverables. DAA will provide a digital version of the report to the OCSWM (Adobe Acrobat or functional equivalent). DAA will provide a digital version of the report to North Carolina Department of Environmental Quality. Exclusions. Deliverables do not include digital source files used in preparing the report (for example, MS Word, MS Excel, AutoCad files). Terms and conditions. Services will be provided in accordance with the content of this proposal and an existing Agreement between OCSWM and Draper Aden Associates (dated February 22, 2017). Background. During May, 2018, the NC DEQ required sampling for a new organic constituent (1,4- dioxane). The November, 2018, sampling event at the Orange County Regional Landfill was the first event conducted to include this newly regulated constituent. The laboratory reported 1,4-dioxane in eleven wells associated with the Orange County Regional Landfill - North facility. Since this is a newly detected constituent, the facility obtained verification samples from the two wells (6801-MW14A, 6801-MW20) at which the largest concentrations of 1,4-dioxane were reported, then submitted the samples to a different laboratory to either confirm or refute the initially reported concentrations. The verification analyses confirmed the exceedances that were reported during the November sampling event. In an electronic correspondence from NC DEQ to Draper Aden Associates (dated September 24, 2019), NC DEQ stated, “As with other constituents of concern, if 1,4-dioxane is reported above the 2L standards, it’s horizontal and vertical extent should be assessed with the intent to eventually initiate corrective action.” Orange County Solid Waste Management previously characterized the nature and extent of constituents that previously exceeded their respective Groundwater Quality Standards at the North facility, and submitted the Assessment of Corrective Measures, Corrective Action Plan, and Corrective Action Monitoring Plan to NC DEQ. The distribution of 1,4-dioxane appears to be consistent with the areal distribution of the other volatile organic constituents that were addressed in the previously submitted Assessment of Corrective Measures, indicating that the existing network of monitoring wells should be sufficient to satisfactorily delineate the extent of 1,4-dioxane in the contaminant plume. The subject proposal is intended to meet the requirements for determining the “horizontal and vertical extent” of 1,4-dioxane in groundwater, as requested by NC DEQ on September 24, 2019. DocuSign Envelope ID: 21CD1CFD-BDC0-4526-AED2-CC88ABCCFC7A