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The capacities of the on-site soils-were analyzedfor 1.)The ability to accept anticipated future _ wastewater effluent flows, 2.)To assess the characteristics of the on-site soil to mitigate:nitrate 911 impact, and 3 }To quantify nitrate impact potential to.thc underlying,gi-oundwater from percolating effluent. This:was accomplished by the referenced testing and-loadrr g calculations. • Although it is an EHD requirement-that any on-site well fora project.must be sampled and analyzed for specific constituents,there. . s.no on-siteirrigation or damest;c well to sample for these Studies. • Wastewater flow volumes emanating from the proposed project have been formulated based upon r: information provided by Mr. Amin Mahmood. Therefore,the nitrate loading calculations are..based on these flow volumes. The soils testing and investigation has found the indigenous surface soilsunder,the.test.location, which was. in the northeast triangular-shaped corner of.the property,to_contairn a predorriinately fine-grained clay, material. Although the test results show acceptable permeability in the deeper.soiis,'management of. wastewater effluent by the surface soils down to 42 inches°soils will;only slightly occur as evidenced by the unacceptable percolation rates. From -9 to l l feet exists a poorly-graded clayey,.silty very fine sand. From -12 to '-20 feet is a silty clay. From -20 to -22 feet is a silty fine sand, and from --22 to 25 feet is a 5 silty, clayey fine sand. The soils at -9 to:-11 feet below grade possess percolative-capacityas demonstrated by an EHD unofficial percolation test conducted at.10J feet below grade:. The.EHD official deep perc test at 22 feet also indicates acceptable percolation:' II. SOIL SUITABILITY STUDY- FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION SSS§ 11. Surrounding land use to the immediate north is the East Bay Municipal Utilities District, ,t� (E.B.M.U.D.), a motel and low density housing. To the east is also very.low density housing, grazing land. To the west is Highway 99 and high density housing on Citywater and sewer." South of the project is rural housing with open land and commercial property. The land'-use referenced is illustrated on the San_Joaquin t County Parcel Viewer Maps found in Appendix A. SSS§ 3.1, 3.2,3.3, 3.4, 3.5,3.6, 3.7, 6.& Applications-,on microfiche files with the EHD reveal that there have been approximately 17 permits issued for.repairs/replacements/additions to existing systems within the one-half mile study area on'the Highway 99 Frontage Road. This can be considered a large number of permits for the study.area°and indicates marginal soil permeability, especially in the top surface soils which is characteristic of the Morada area. From observations made by EHD, commercial facilities-on conventional septic syste -along the Highway 99 � Corridor, particularly in the Morada area; have been.problematic. /4p'p!�-wl- 1�� The project site has level terrain; consequently, there will-be no need to incorporate design considerations for slopes for the futu're-disposal area. Under EHD requirements and regulations, a mound system for effluent disposal would not be allowed for this future project even though tight clayey surface soils exist. 2' Chesney Consulting