SR0078011 SSNL - Laserfiche WebLink

Home Browse Search

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 bP exceeded when new improvements occur on a subject Parceci�ically, concerns regarding nitrate loading could potentially occur when second unit dwellings are constructed on comparatively small parcels. Mr. Joe Alvarez is proposing to move a three bedroom ore-manufactured home onto the subject parcel. This parcel is a 1.54 acre property that currently contains a three-bedroom single family residence (SFR) structure adjacent to Bird Road. As noted on the attached SJC District Viewer map, the subject property is located one mile south of 11 Street. Nearby surrounding land use is predominately agricultural production and sparse rural residential. The City of Tracy is to the northwest of the property. It will be decades, if at all, before City services reach this locale. Surrounding land use is illustrated on the attached Google soil map photo. 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 propose_d_location of - the new leachfieldarea.. 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, but extremely conservative, calculations. An assessment of the characteristics of the on-site soils was made to discuss the mitigation of nitrate impact. SOIL INFORMATION NLS§ 1.1. The attached USDA Soil Map indicates the Map Unit Name soil type is #121 and is 85% Capay clay with the remaining percentages listed as four 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 s ep consists of a clay soil, with sand, silt and clay percentages of 16%, 32% and 51%respectively. The high clay content of the on-site soils can be considered very significant, as will be discussed. Page 1 of 13