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Report of Findings—Phase 11 Soil an. 3roundwater Assessment Page 2 Teixeira-Souza Dairy February 1,2007 WKA No. 6504.45 cattle feed. WKA has completed a series of assessments and has published several reports that detail activities performed at the site during the closure, removal, and evaluation of the former dairy. Documentation of recent assessment and dairy closure activities include the following: • Phase 1 Environmental Site Assessment Update: Mountain House Teixeira-Souza Property, published January 6, 2006. WKA No. 5475.03 • Report of Findings—Dairy Waste Removal. Teixeira-Souza Dairy, Mountain House Specific Plan 111, published November 27, 2006. WK4 No. 6504.07 As a result of initial site assessment activities, WKA recommended that prior to any future development, all dairy waste (manure, sludge, wastewater), impacted soil, and buried debris should be removed from the site to minimize environmental impairments to future land development. Following waste removal activities and to support final dairy closure, confirmation soil-gas, soil, and groundwater sampling was conducted at the former dairy portion of the site to evaluate the effectiveness of waste removal activities and to screen for the potential presence of hazardous gases. Analytical results of the soil-gas, soil, and groundwater confirmation sampling indicated that the waste had been removed effectively at the former dairy area. Because the scope of work during the dairy waste removal process did not include the analysis of groundwater samples for Total Dissolved Solids (TDS) or Nitrate as Nitrogen, WKA proposed a groundwater quality assessment be performed at the site to identify potential impacts to the shallow groundwater and to evaluate whether the groundwater concerns in the vicinity of the former dairy should be disclosed to future land owners. REGULATORY AGENCY POLICY On November 22, 2006, the Central Valley office of the California Regional Water Quality Control Board (RWQCB) published tentative Waste Discharge Requirements (WDRs) to monitor and regulate waste discharges from active dairies that could impact surface and groundwater quality within California. The tentative WDR document entitled, "Waste Discharge Requirements General Order For Existing Milk Cow Dairies, " was presented in a public review and comment workshop on December 7, 2006, which was attended by a WKA representative.