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II. SOIL SUITABILITY STUDY FINDINGS A. SUBJJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION SSS§ 1.1. Land use to the immediate east and west is commercial and industrial. To the south is commercial and residential, and to the north is industrial. SSS§3:1,32,3.i,3.4,3.,3. ,,17, "nApplications in the EHD microfiche files show there was once a septic tank located approximately 500 ft to the northeast of the existing building. The attached Perruit was obtained fro to have an EHD Sanitarian investigate for the presence of this tank. e tank could not be located d it was subsequently determined by EHD that it must have been cl removed. Permits issue airs/replacements/additions to existing systems within the one-half mile radius study area ate nota lable. It is known that in this locale, there are continual failures. Given the _ clay content of a on-site and surrounding soils with a propensity of initial rapid permeability but hastened biomat formation, septic system longevity is limited and septic system failures occur. The project site has level terrain; consequently,there a need to incorporate design considerations for slopes within the effluent disposal area. B. SOIL/PHYSICAL CHARACTERISTICS AND ANALYTICAL TEST RESULTS SSS§ 5.2. The United States Department of Agriculture -Natural Resource Conservation Service (USDA-NRCS) indicates the property soils are Capay Urban land complex composed of 50%Capay clay(#122). The surface and subsurface soil investigation began on May 3, 2017 with the drilling of one 36-inch deep pert test boring. In addition to the perc test boring, a backhoe was used to explore for the water table. Noater table/groundwater was encountered to a depth off l�the soil was a uniform Capay y down to this depth. NLS§ 1.1.1 1.;( Auger cuttings were sampled from the bottom of the 3-ft test boring for chemical analysis. As noted on the A&L Laboratory Soil Report in Appendix C, analysis of the soil sample quantifies a number of constituents that influence nitrate loading for this project. The important parameters for nitrate loading assessment are the organic matter,pH, cation exchange capacity (CEC), and the nitrate-nitrogen content of the soil. As noted,the organic matter is 1.3% which translates to an Estimated Nitrogen Release (ENR) of 56 lbs. of N/acre. This is an insignificant concentration of nitrogen over a one acre area. The soil nitrate-nitrogen concentration is low 1 ppm. Because septic effluent is composed predominately of ammonium (NH4),the pH, along with the CEC, are significant influences on the ammonium molecules. The pH of the soil is almost neutral at 7.1 at - the proposed soil-effluent interface. Page -2-