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F DUCTION lting has been retained by Mr. &Mrs. Bill and Stephanie Prioste to complete the the San Joaquin County Environmental Health Department (EHD) for theproposeconstruction of their small Windmill Ridge Winery and Tasting Room. The EHD requirements were specified in Conditions of Approval, dated August 16, 2005. The Environmental Health Department has been at the forefront of nitrate impact investigations and the prevention or mitigation of environmental contamination from various sources of nitrate, particularly septic systems. EHD requires these investigations and corresponding septic system operational criteria under Community Development Title 9-1105.2 (d) for projects in unsewered areas, in areas currently impacted with nitrate, or for projects that may potentially impact the underlying groundwater with nitrate. The EHD's primary concerns regarding this project are: 1.) The current environmental condition of the soil and groundwater under the proposed wastewater disposal area, 2.)Natural nitrate impact mitigation measures through septic system operation to alleviate future nitrate impact to the underlying groundwater, 3.)Assurance that sufficient wastewater disposal area exists to accommodate the average daily effluent flow from the combined septic systems of the proposed winery/tasting room and existing on-site residential structure, 4.) Assurance that there is sufficient 100%replacement area that will remain designated as such, in the event of system failure, or a need to"rest"the primary disposal area, and 5.)Assurance that the primary disposal field and 100%replacement area comply with the 100-foot rule, as stated in the S.J.C. Sewage Standards Section 8.1,Page 15, in which a sewage disposal area must be 100 feet from a non-publicly operated domestic well. This study proposes that effluent from the existing septic system that serves the Prioste's house, and effluent from the restrooms of the future winery/tasting room be combined into two septic n tanks in series (not parallel)to be pressure-dosed equally throughout a new filter bed. The filter C bed will consist of pressurized later in Infiltrator Chambers®. Q Within the text of this Report, olded Section (§) umbers are referenced at the beginning of applicable Paragraph or Paragra s, Appen ' r Table o on is that correspond with the EHD _n Requirements Checklist. Section Numbers referenced as SSS§, a sections ap r the Soil Suitability Study Requirements Checklist. Section Numb rs referenced 7ortions , e sections applicable for the Nitrate Loading Study Requirements Checklist. Oth of text may also apply to other sections of the Checklists. A. SUMMARY OF FINDINGS _ The findings of my study revea ere:ar� vorable'_s itharact ten tis¢s in the upper surface soil strata where the combined septic eFAulll lse distributed._characteristics include a high clay content soil that may: 1.) Create anaerobic microsites to prevent nitrification, 2.) Nitrate that may form in the first few inches of the soil-effluent interface may be denitrified in these clay microsites during effluent dosings when these first few inches may become temporarily saturated, Page -2- Chesney Consulting