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II. SOIL SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION SSS§ 1.1. The subject property contains a residential structure at the north side of the property, an existing Office Building, Warehouse Buildings, Truck Dock, Tank Farms, Bottling Building and Maintenance Building. Land use to the immediate north, south, east and west is agricultural production land, primarily wine grape vineyards and almond/walnut orchards. There are surrounding rural residential units, all on onsite wastewater treatment systems. SSS§ 3.1,3.2,3.3, 3.4, 3.5,3.6, 3.7, 6.8. Application for Liquid Waste/Water Well Permits found in the EHD online data base pertaining to the subject property and project exclusively, number in the hundreds. In an effort to save paper, only 50 pages of significant documents pertaining to the winery are included with this Report. Permits applications within the one-half mile radius study area from the property were also reviewed for repairs/replacements/additions to existing septic systems. Three permits primarily for repair of lines and d-box alterations were found. This can be considered a typical number of permits within a study area. Considering the sandy surface soils and increasing sand content with increasing depth, OWTS in this locale have comparatively long life spans. The project site has level terrain; consequently, there is no need to incorporate design considerations for slopes within the existing effluent disposal area. B. SOIL PHYSICAL CHARACTERISTICS AND ANALYTICAL TEST RESULTS The UC Davis Soil Web indicates the effluent disposal area soils consists of Chuloak coarse sand loam (#127), with Manteca, Delhi, Veritas and Tinnin sands. Remaining land area of the property on the east side of the winery consists of Delhi loamy sand (#142). This area could potentially become a future OWTS effluent disposal area as the winery continues their expansion program. SSS§5.2. The surface and subsurface soil investigation began on June 26, 2020. Two 40" deep percolation test borings were hand-drilled at the east and west ends of the existing leachfield, designated as Leachfield West 40" (LFW40) and Leachfield East 40" (LFE40). Soil samples were retrieved from the 36"40" depths. In addition, a backhoe test pit was dug southwest of the leachfield and soil samples retrieved from 8 ft and 12 ft depths. NLS§ 1.1, 1.2. Composite soil samples from these referenced depths were retrieved for chemical and particle size analysis. As noted on the attached A&L Laboratory Soil Analysis Report, chemical analyses of the retrieved soil samples quantify several constituents that influence nitrate loading for this project. The important parameters for nitrate loading assessment are the organic matter, clay content, pH, cation exchange capacity(CEC), and the nitrate-nitrogen content of the soil. Page -2- Chesney Consulting