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P, n- F • Soil physical and chemical testing was conducted. Physical testing included percolation testing and particle size analysis of the soil characteristics. Chemical testing included analyses for the constituents that influence nitrate loading. • Depth to the water table easured by the sounding 6 s a i g water in a backhoe test pit, which was measured t 7.2 fe t below grade�lVloundi g Anily s of the water table underlying the test location was cal lated r this proJed �- • In compliance with EHD requirements,nitrate and the agrichemical dibromochloropropane(DBCP) were analyzed from the on-site domestic well, along with extensive inorganic and organic analyses. / A water table sample was tested for nitrate,chloride,T.D.S. and Total Alkalinity. • Since ultimate wastewater flow volumes emanating from a proposed project are unknown, the Nitrate Loading Calculations were formulated to theoretically estimate the number of people the subject property could support without exceeding the Maximum Contaminant Level for nitrate, and the Porter-Cologne Water Act. This is commonly referred to as the "carrying capacity"of a unit area of land. In summary,the soils testing and investigation has found the indigenous soils under the test location,which was in the extreme north corner of the property,to contain a predominately fine-grained clay material with acceptable percolation capabilities where a soil-effluent interface elevation would be anticipated. The soils possess percolative capacity, contrary to the clay soil characteristics,which is relatively common in this locale and the Tracy area in general. Although the test results show acceptable permeability,long-term acceptance rates of wastewater effluent by the indigenous soils will decrease over time. This premise is based on the number of septic system failures that have occurred,particularly those witnessed by EHD in the Banta area of Tracy. The water table underlying the soils test location has been impacted with nitrate to more th n 1.5x e Maximum Contaminant Level. Nitrate Loading calculations have been based on this water table to t result, correlated with the above-referenced Porter-Cologne Water Act. Mounding Analysis theoretically demonstrates that a�0.4rise of the water tabl am y o cur under effluent percolating from assumed effluent flow volumes. �� II. SOIL SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION SSS§ 1.1. Surrounding land use to the north is very sparse rural residential with agricultural production, primarily dairy,north of the Banta area. To the east are I I' Street and the Chevron Banta Loading facility. f To the west contains the referenced Banta area of Tracy, dairies and dai cropland. Interstate 205 is approximately 2 miles north of the property. The land use re renc is ill strated on the San Joaquin County Parcel Viewer Maps. The property is currently zone AG-40 SSS§ 3.1, 3.2,3.3, 3.4, 3.5, 3. , 6.8. Applications on microfiche file with the EHD reveal that there have been approximate y five Permits issued for repairs/replacements/additions to existing systems on West Grant Line koadxclusively. 2 Chesney Consulting