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r <br /> June 15, 2010 Residential Well Monitoring (CRA): Five domestic water wells located <br /> northwest of the site were sampled to determine if petroleum hydrocarbons are present <br /> in the wells. The findings of this monitoring event and the sampling procedures <br /> followed are detailed in the July 30, 2010 Residential Well Monitoring Report. No <br /> petroleum hydrocarbons were detected in the samples collected from all five domestic <br /> water wells. The two wells closed to the former pipelines were placed on an annual <br /> sampling schedule. No petroleum hydrocarbons were detected in the samples collected <br /> from the two domestic water wells to date(May 2013). <br /> July 12, 2010 to September2, 2010. Thirteen groundwater monitoring wells were <br /> installed at the site to assess groundwater quality, gradient and flow direction in the <br /> vicinity of the former crude oil pipeline. The wells installed were MW-1 through MW-4, <br /> MW-5A, MW-5B,MW-5C,and MW-6 through MW-11. The wells monitor groundwater <br /> three zones; 30 to 50 ft bgs (Zone A), 105 to 125 ft bgs (Zone B), and 160 to 177 ft bgs <br /> (Zone C). The findings of this investigation and the sampling procedures followed are <br /> detailed in the October 15,2010 Site Investigation Report. <br /> May through July 2011: Twenty soil borings were advanced to assess soil conditions <br /> beneath areas 7, 8, and 9. TPHc impacts in soil were detected in some soil samples <br /> collected from each area. Six groundwater monitoring wells, MW-12, MW-13B, MW- <br /> 13C, MW-14B, MW-14C, and MW-15 were installed to assess groundwater quality, <br /> gradient, and flow direction. Based on the third quarter 2011 monitoring event, TPHc <br /> impacts in groundwater were observed in Zone A wells MW-2, MW-5A, and MW-15. <br /> TPHc impacts in groundwater were observed in Zone B well MW-13B. No TPHc <br /> impacts were observed in Zone C wells. Three nested soil vapor wells were installed to <br /> assess soil vapor impacts. Soil vapor samples contained a limited number of VOC and <br /> SVOC constituents at varying concentrations. <br /> November 2011: During this investigation,phase exploratory borings were drilled along <br /> the former pipeline alignment. A total of 29 exploratory borings were drilled (B-96 <br /> through B-104, B-104A, B-104B, B-105 through B-109, B-109A, B-110 through B-113, <br /> B-113A, B-113B, B-114, B-115, B-115A, B-115B, B-116, and B-117). The findings of this <br /> investigation and the sampling procedures followed are detailed in the May 13, 2013 <br /> Subsurface Investigation Report and Updated Site Conceptual Model. This report also <br /> presents the finding of a human health risk assessment (HHRA) and ecological risk <br /> assessment(ERA) <br /> 060223(33) A-4 CONESTOGA-ROVERS&ASSOCIATES <br />