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is II. SOIL-..SUITABILITY_ STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION SSS§ 1:1 The subject property has been in rice agricultural production for the past three decades, / farmed by the Sorrenti Family, 'It is bound'to the north by additional rice production land and -Edwards Road,to the east and west'is-also additional rice and cropland;and to the south arc exclusive rural homes. SSS(2.1 NLS 2. 3.1 .3 Upgradient land use which has been in agricultural production for man a �ad s ma b nsider�to have contributed to a otential nitrate roblem. However,Y� Y p ptesting o - omestic well that servesthe Sorrenti residence reveals a-nitrate(as nitrate) concentration of 11:8 pp in 2004:. The surrounding residential structures on septic systems is extremely sparse and could of create any significant nitrate problem. Surrounding and upgradient land use is evidenced by - - nited States Department of Agriculture(USDA) Soil Maps for this area of San Joaquin County, found'in Appendix 2. SSS 3.1 ?'�t&nty. 3;3.4 3.5,3.6 There e no septic tanks o e subject property.(Applications on file ith/tkiEnvironmental He th Departmen veal that there have bee no permits issued r for ad tionss-and repairs to existing syste ne-half mile radius study area. T is due to fact that the surrounding residential structures are very sparse, as referenced. Also, there are new residential structures directly to the,south of the subject property that were recently constructed. . 1 = NLS §1.0 B :SOIL PHYSICAL AND CHEMICAL CHARACTERISTICS NLS§l. 1. SUBSURFACE SOILS EXPLORATION AND SAMPLING To analytically assess the surface and subsurface soils for comparison purposes, soil samples were retrieved with a truck-mounted drill rig using solid stem auger. Samples were obtained from five- -foot depths down to 25 feet under proposed Parcel 2 and proposed Parcel 5. The exploratory -drilling locations"of these two borings are denoted on the Tentative Map found in Appendix 4, and :.:also illustrates the percolation test locations. These two boring sites were chosen to compare subsurface soil structures equidistant between the east and west areas of the project. The soil samples were submitted to A& L Western Agricultural Laboratory for analytical testing - under the attached Chain of Custody(Appendix 6). As noted on the Soil Analysis Reports, several constituents were analyzed. "Non-nitrogen"constituents that were tested relating to nitrate loading include the.organic matter content of the soil,pH, and the Cation Exchange Capacity(CEC). The constituents listed above also play a role in the denitrification capacity of the underlying soil. From the results of this Study and previous domestic'well water tests(as referenced above), appear - - to be significant. ,Denitrification capacity is predominately dependant upon: 1.).Abundance of an -organic carbon substrate, 2.)High soil moisture content leading to an anaerobic environment, and , _ :3.) High soil pH (alkaline). The organic matter content of the subsurface soils are of a low percentage which was to be expected; however, the pH is alkaline for all of the soil samples. Page -2- - Chesney Consulting