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II. SOIL SUITABILITY STUDY fFINDINGS A. S JECT PROPERTY AND SURROUNDING STUDY NFORMATION SSS§ 1. Surrounding land use to the north is, and has been, in agricultural production for man decades. To the east, west, and south contains the referenced Larch-Clover are f Tracy. As noted on the San Joaquin County Parcel Viewer Maps, the current surrounding lan"se i composed primarily of agricultural production land to the north. The property is zone R-L, Density Residential. ( SSS§ 3.1,3.2, 3.3, 3.4,3.5,3.6. 'Applications on microfiche file with the EHD reveal that there It been 12 permits issued for repairs/replacements/additions to existing systems on Larch Road exclusively. referenced, this area has always had a significantly high number of repair permits due to the clayey soil and high groundwater, and may also be due to inadequate systems originally installed. The project site has relatively level terrain; consequently, there will be no need to incorporate design considerations for slopes within the mound system area. Mound systems are Sens' ' loping, and changes in design must be taken into consideration when natural ground ping is prese It is imperative that during the preparation of the indigenous soil surface where a mound system is o be installed, be absolutely level. B. SOIL PHYSICAL CHARACTERISTICS AND ANALYTICAL TEST RESULTS The United States Department of Agriculture - Soil Conservation Service(USDA-SCS) indicates the on-site soils to consist of Capay clay(#118). SSS§ 5. The surface and subsurface soil investigation and testing began with drilling one 24 inch, andone 0 inch deep boring near the proposed effluent disposal location using a truck-mounted drill riga rl cutting samples from the bottom of these two borings were retrieved for chemical analysis, as well as a sample from the soil surface. rl\ NLS§ 1.} 1.2. As the noted on the A&L Laboratory Soil Analysis Reports, chemical analyses of the three soil les quantify several constituents that influence nitrate loading from this project. The important parameters for nitrate loading assessment are the organic matter,pH, cation exchange capacity(CEC), clay content percentage, along with nitrate-nitrogen content of the soil. Total Kjeldahl Nitrogen(TKN) content was also measured because it reveals the organic and ammonium fractions of the tested soil samples and provides a baseline for potential future comparisons of soil samples from under the mound system. As noted, the organic matter in the surface soils is very high and declines at the 24 inch and 40 inch / depths. A high surface soil organic matter must be attributable to native vegetation. The TKN results reveal very high concentrations down to 40 inches in depth. This suggests a medium-to-high potential for future nitrate-nitrogen loading from indigenous nitrogen soil content. 3 Chesney Consulting