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_ ❑ .m Analyze and assess the soil characteristics for assimilative capacity and nitrate mitigation. _ - Analyze and assess the underlying groundwater to quantify nitrate impact, and to estimate assimilative capacity.forfuture nitrate impact: ' _ - Correlate the calculated nitrate-nitrogen:loading of wastewater flows from the septic-_ T =s ❑ - __ systems with nitrate-nitrogen potential-originating from the on-site walnut orchard _ z II. SOIL-SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY-AND,SURROUNDING STUDY AREA'INFORMATION - = The land for the facility and surrounding land:has been in agricultural production for many--years— This any_yearsThis is evidenced by the United States Department of Agriculture (USDA) Soil-Maps for Sari F- Joaquin County. The current surrounding land use is composed-of agricultural-production=land and extremely low density housing: To the north ar_e the_Southern°Pacific Railroad tracks, and =_ - 4' -- miles the west is the city of Stockton. -To-the south and east is agr-iculti.iial production- nine = - - - _ _ land. It is our.understanding the property is not in the I60=—flood plain _. _ Applications on file with the County Environmental Health Department reveal that there.have been eight permits issued for repairs/additions to existing systems in the two-mile radius-study =_ - = area. Five of the eight repairs/additioins were for.seepage pits and one addition was for a sump - This can be considered a' 6 - c .high number of repairs/additions considering the low_ density-housing and commercial facilities in this locale.-Although the housing density is-very low,the requirement for additional drainage can most likely be attributed to biomat formation on . the silty clay soil that exists at the typical-leachline depth. - - B. SOIL PHYSICAL CHARACTERISTICS AND ANALYTICAL TEST RESULTS - Theproject site has level terrain;.co_nsequently there will be no need to'.incorporate design - - considerations-for slopes. -Soil Survey-Maps.from the United States Department of Agricultural = _- USDA indicate the on-site soils to consist of a Hollenbeek silt cla- #173 The new _-: leachfield for.Phase II will be..installed".in this soil. Favorable perorates were obtained at the shallow 424nch depth, which is representative of leachlines and the deep 23 foot boring; wich y _ f is representative- of seepage pits.-The 12-ft perc test boring,representative of sum .a, d- oor _ A _ percolation test results: - - -- _ In addition to the three percolationtests conducted,three additional borings were also com, pleted'27 in, and next to, the recently constructed wastewater holding pond. The purpose of these borings W were to 1.) Establish an analytical baseline of the soil under the floor of the wastewater holding = - pond, 2•)Establish the hydraulic conductivity of the soils;and 3.) Classify the soil profile down,_Y to 45 ft: Vafley?Ig Researk c -