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jr II. SOIL -SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION SSS§ 1.1. Surrounding land use to the north is, and has been, in agricultural production for many decades. To the east,.west, and south contains the referenced Larch-Clover.area of Tracy. As noted on the San Joaquin County Parcel Viewer Maps, the current surrounding land use is composed primarily of agricultural production land to the north,"The.propertyis.zoned R-L, Low Density. Residential. SSS§ 3.1, 3.2, 13,:3.4,3.5,3.6. Applications"on microfiche"file with the.EHD reveal that there"" have been 13'permits issued for repairs/replacements/additions to existing systems on Larch and Corral Hollow Roads. As referenced; this area`,has always had a significantly high number of repair permits due to the-clayey soil and high groundwater, and mayalso be due to inadequate systems originally installed... No records were'found regarding the on-site septic system for the defunct labor camp. The project site has relatively level terrain; consequently, there will'be no need to incorporate design considerations for slopes within the filter bed disposal area. Filter bed disposal systems may be sensitive to sloping whereby the,effluent could congregate at the lower-end of the soil=effluent ` interface if the filter bed is not constructed carefully. The soil-effluent interface area at the floor of the filter bed must be completely 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 (4'118). A's referenced, this clay type soil possesses surprisingly rapid permeability, SSS§ 52. The surface and subsurface soil investigation and testing began with the excavation of a backhoe test pit to observe the underlying soil structure,take soil samples; and retrieve a water table sample. On June 9, 2009, a backhoe.from Minyard Excavating dug an11 ft pit near the proposed . effluent disposal`location. Soil samples from five depths (2 ft, 3.5 ft, 5 ft, 7 ft and 11 ft)were retrieved for chemical analysis. NLS§ 1.1, 1.2. As the noted.on the A&L Laboratory Soil Analysis Reports, the chemical analyses of". the five soil samples quantify several constituents that influence nitrate loading from this project. d 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. As noted the organic matter in the surface soils is low within the surface"soils and declines at the deeper depths. A low surface soil organic matter may be attributable,to the lack of native surface vegetation. Chesney Consulting