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I. INTRODUCTION This report issues my investigative findings on the soil and groundwater under the subject property to properly design and specify operational criteria for a proposed commercial septic system. Mr. Mike Brown is the owner of the 5.9 acre subject property. He is proposing to install a mobile commercial coach office building along with a new septic system to serve this building. A three bedroom, two bath single family residence currently exists in the NEC of the triangular shaped parcel. The existing domestic well will serve both structures. Within the text of this Report, Bolded Section (§) numbers are referenced at the beginning of an applicable Paragraph(s), or Appendices that correspond with the EHD Requirements Checklist. Section Numbers referenced as SSS§, are sections applicable for the Soil Suitability Study Requirements Checklist. Section Numbers referenced as NLS§, are sections applicable for the Nitrate Loading Study Requirements Checklist. Other portions of text may also apply to other sections of the Checklists. NLS§ 2.3,($SS§3.1. As noted on the attached District Viewer map,the subject property is located near'the"intersection of the Hwy. 120 bypass and Interstate 5 in the southwest area of Lathrop. �SS§ 1.1, 1.2. As referenced,the property is 5.9 acres in size with completely fallow open area except for the residential structure and detached garage. Present land use is illustrated by the attached Google aerial photo. The following is a summarization of the information collected to complete this report. Wastewater system operational parameters are discussed in this report to supply required information to EHD: • The primary disposal area and the required 100%reserve/replacement area are described and calculated within. • Soil chemical testing was conducted on two samples retrieved from the four-foot percolation test boring. Physical testing of the soil included the actual percolation testing to determine particle size analysis correlated with permeability. Chemical testing included analyses for the constituents that influence nitrate loading. • The capacities of the on-site soils were analyzed for: 1.) The ability to accept future wastewater effluent flows from the commercial coach, 2.) To assess the characteristics of the on-site soils to mitigate nitrate impact, and 3.) To quantify nitrate impact potential to the underlying groundwater from percolating effluent, and 4.) Describe processes to mitigate nitrate loading. This was accomplished by the referenced testing and calculations. • The on-site domestic well was sampled and analyzed for the specific constituents of nitrate, and dibromochloropropane (DBCP) and ethylenedibromide (EDB), pursuant to San Joaquin County Environmental Health Department(EHD)requirements. 1