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I. INTRODUCTION This report issues my investigative findings regarding the Nitrate Loading Study conducted for the project referenced on the Title Page. This Study was required because of new regulations enacted by the San Joaquin County Environmental Health Department(EHD)to ensure nitrate loading standards would not be exceeded when new improvements occur on a subject Parcel. Specifically, concerns regarding nitrate loading could potentially occur when second unit dwellings are constructed on comparatively small parcels. Mr. Galvan and his tenant, Mr. Robbie Garzini are proposing to refurbish an existing shop structure on the subject property into a two-bedroom guest house. The 0.91 acre property currently contains the shell of this structure along with a three-bedroom single family residence (SFR) structure adjacent to Clover Road. Nearby surrounding land use is rural residential. Land use further from the subject property is the I-205 Freeway, the City of Tracy, and to the north, predominately agricultural land. This land use is illustrated on the attached Google soil map photo. As noted on the attached SJC District Viewer map,the subject property is located 400 ft east from the intersection of Clover Road and Corral Hollow Road. Within the text of this Report, Bolded Section (§)numbers are referenced at the beginning of an applicable Paragraph(s), or Appendix that corresponds with the EHD Nitrate Loading Study Requirements Checklist. Other portions of text may also apply to other sections of the Checklist. The following summarizes the investigative parameters included to complete this report: • Soil chemical testing was conducted on a soil sample retrieved in the proposed location of the new leachfield area. Physical testing of the soil sample included texture particle size analysis for sand, silt and clay content, and chemical testing analyses for the constituents that influence nitrate loading. • The nitrate loading to the on-site soils in combination with nitrate impact potential to the underlying groundwater from percolating effluent was quantified through generally accepted calculations. An assessment of the characteristics of the on-site soils was made to discuss the mitigation of nitrate impact. SOIL INFORMATION C�NLS§ 1.1. The attached USDA Soil Map indicates the Map Unit Name soil type is#118 and is 5 Zo Capay clay with the remaining percentages listed as six other soil types. As referenced, a soil sample was retrieved from a three-ft depth for physical and chemical analyses. The attached texture analysis reveals the on-site soils at the three-ft depth consists of a clay loam, with sand, silt and clay percentages of 36%, 31% and 33%respectively. The clay content of the on-site soils can be considered highly significant. Page 1 of 12