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145 • Since these Studies have been conducted specifically for a General Plan Amendment/Re-Zone Application,the primary disposal area and the required 100%reserve/replacement/addition areas that may eventually serve a commercial project have not been described,but will have to be extensively detailed for a proposed project and illustrated on a Site Plan. • Soil physical and chemical testing was conducted. Physical testing included percolation testing and particle size analysis to determine soil characteristics. Chemical testing included analyses for the constituents that influence nitrate loading. • The capacities of the on-site soils were analyzed: 1.)For the ability to accept potential future wastewater effluent flows,2.)To assess the characteristics of the on-site soil to mitigate nitrate impact, and 3.)To quantify nitrate impact potential to the underlying groundwater from percolating effluent and relate impact to the Porter-Cologne Water Act. This was accomplished by the referenced testing and loading calculations. • Although it is an EHD requirement that any on-site well for a project must be sampled and analyzed for specific constituents, the on-site irrigation well could not be sampled since there was no water in the well,and the pump was inoperable and could not be repaired. (.3) • Ultimate wastewater flow volumes emanating from a proposed project are unknown. Therefore,the nitrate loading calculations were formulated to theoretically estimate the number of people the subject property could support or assimilate without exceeding the Maximum Contaminant Level for nitrate,and the Porter-Cologne Water Act. The maximum number of on-site people(employees, customers,etc.)the subject property can assimilate daily without violating the Porter-Cologne Water Act has been calculated to be 150. The soils testing and investigation has found the indigenous soils under the test location,which was near the northeast comer of the property, to contain a predominately fine-grained clay material with unacceptable / percolation capabilities down to approximately six feet below grade. From 6 to 13 feet exists a poorly- 3� graded silty sand. From 13 to 16 feet is a clayey silty sand. From 16 to 22 feet is a silty fine sand and from 22 to 25 feet is a silty, clayey fine sand. The soils below eight feet possess percolative capacity as demonstrated by the percolation test results. Although the test results show acceptable permeability in the deeper soils, long-term acceptance rates of wastewater effluent by the indigenous soils will decrease over kto time. II. SOIL SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION SSS§ 1.1. Surrounding land use to the north is a grape vineyard, other types of agricultural production, and very low density housing. To the east is Bear Creek, the Highway 99 Frontage Road and Highway 99. To the west is another vineyard, a small residential structure and Micke Grove Road. The land use referenced is illustrated on the two San Joaquin County Parcel Viewer Maps found in Appendix A. LLhave 3.1,3.2,3.3,3.4,3.5,3.6,3.7,6.8. Applications on microfiche files with the EHD reveal that there been approximately nine permits issued for repairs/replacements/additions to existing systems within ne-half mile study area on the Highway 99 Frontage Road. This can be considered a very large numberrmits for the study area and indicates marginal soil permeability,especially in the top surface soils. 2 Chesney Consulting