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(§ 1.0) INTRODUCTION rr This Soil Suitability Study presents the results of my investigation concerning the soil characteristics and groundwater under the subject property referenced on the Title Page. It was completed to satisfy the requirements of the San Joaquin Environmental Health Department (EHD), specifically: 1.) To determine if the proposed homesite Parcel 1 to be created from this subdivision is acceptable for the proper operation of a septic system which will function as intended for its anticipated lifespan, and 2.) Provide analysis and recommendations based upon the environmental criteria encountered in this study. This report is in compliance with the requirements for a Soil Suitability Study under Development Title Section 9-1105.2 Item (d) of the San Joaquin County Ordinance Codes. Within the text of this Report, bolded Section (§)numbers are referenced at the beginning of an applicable sentence, paragraph or paragraphs, or Appendices that correspond with the EHD Requirements Checklist for a Soil Suitability Study. (§ 2.0) SUBJECT SITE AND STUDY AREA BACKGROUND INFORMATION V(§ 1.1, 1.2, 2.1) The purpose of this project is to subdivide an existing 59t acre Parcel (Area determination according to Tentative Map; District Viewer Map says 54.96 acres), into two Parcels denoted as Parcel 1, which is to be 3.0 acres and a Designated Remainder Parcel, which is to be 56 acres. Mrs. Stokes' single family residential (SFR) structure is proposed to be built on Parcel 1. The homesite building pad is in the process of being constructed. It is proposed to install the septic tank and leachfreld off of the building pad, near the center and to the south of the pad. The Designated Remainder was planted in wine grapes,which were removed last fall. A new vineyard is to be planted that will surround Parcel 1. There is an irrigation well denoted as the "existing irrig. well"on the Tentative Parcel Map, located at the entrance road to Parcel 1. A domestic well exists in the extreme northeast corner of the Designated Remainder, along with a septic system that serves a mobile home there. These two wells were sampled and tested for this Study. A domestic well is proposed to be drilled for the new residence. 4,"'(§3.7) Parcel orientation is denoted on the Tentative Map found in Appendix A, produced by Mike Farley, PLS. It is possible EHD would support a second unit dwelling on proposed Parcel 1. Any additional building proposed to be built on the Designated Remainder will have to observe EHD requirements, which would include a perc test in the location of the proposed building. If a primary house and second unit dwelling were built on Parcel 1, and a primary(the existing mobile home) and second unit dwelling were built on the Designated Remainder, this would give a total of four septic systems on the two Parcels consisting of approximately 59 acres. This is a density of one septic system per 14.8 acres,which can be considered extremely low. Nitrogen fertilization and mineralization from organic matter decomposition would constitute a much greater nitrogen input than from these four septic systems. �§ 1.1 and 2.1) The subject property is approximately two miles southeast of the town of Thornton. Surrounding property use consists predominately of agricultural production land, a wood products industrial facility, wastewater ponds to the north, extremely low density single family homes, ranchettes, and ag buildings. Page -1- Chesney Consulting