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7Weo find from the results of the soil testing, that the surface and subsurface soil environment under the existing leachlines appears to be contributing a nitrate-nitrogen concentration approximately equal to the soil nitrate-nitrogen concentration under the existing cherry orchard. Consequently, nitrate-nitrogen loading from a new septic system that may be installed for a second unit dwelling on Parcel 1,would be roughly equivalent to the land use remaining in cherry orchard production. II. SOIL SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION It is our understanding the subject property has been the DeAngelis esidence since 196$ and is located at 27475 Fairoaks Road, one-third mile south of Valpico Road. It is bound predominately by single family residential structures to the north and to the south. Property to the west from the primary residence is the Designated Remainder cherry orchard, and other single family residences. To the east is additional single family residences, mostly on one acre parcels. The wide-range surrounding land use of residential structures on septic systems, and upgradient land use which has been in agricultural production for many decades, have contributed to the referenced nitrate problem. Surrounding and upgradient land use is evidenced by the United States Department of Agriculture (USDA) Soil Maps for this area of San Joaquin County, found in Appendix 2. In addition, there are significant upgradient gravel mining operations. Although there has not been a documented correlation made between observed high nitrate concentrations in groundwater gradient from gravel quarries, it has been observed in San Joaquin and Merced Counties. r I Applications on file with the County Environmental Health Department reveal that there have been ` six e its issued for additions and repairs to existin s stem�n the o - _ Uu' � This can be c of ermits. The septic system permits {including the original permit for the DeAngelis residence), well/pump permits and well logs from nearby wells are found in Appendix 6. B. SOIL PHYSICAL AND CHEMICAL CHARACTERISTICS 1. SURFACE AND SUBSURFACE SOILS OF EXISTING CHERRY ORCHARD AND IN THE ANTICIPATED AREA OF SECOND UNIT DWELLING ON PROPOSED PARCEL 1. To analytically assess the surface soils of the cherry orchard, 20 soil subsamples from 0 to 10 inches in depth were obtained from equal distances throughout the orchard, as denoted on the Tentative Map. The 20 subsamples were composited to create one sample for analysis, which is theoretically representative of the entire orchard. The second sample was retrieved from the bottom of the perc test boring at 38 inches below the ground surface. This soil sample represents soil chemistry from the bottom of a potential future leachfield. Page -2- Chesney Consulting