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[I] EXECUTIVE SUMMARY This Soil Suitability Study and Nitrate Impact Investigation presents the results of our research concerning the soil strata and groundwater under the above-referenced property. The subject property is located at 9330 East Lathrop Road, approximately 3 miles northeast of the town of Manteca. Our study was done for two specific reasons: First,to determine if this site is acceptable for a septic system which will function properly and pose no adverse environmental impact to surface (irrigation) waters, or to the underlying groundwater. Secondly, our study addressed the elevated nitrate concentrations found in the survey area wells and also analyzed the on-site domestic well water for DBCP/EDB pesticide concentrations. This subdivision was allowed to proceed by the San Joaquin County Board of Supervisors although the subject Parcel is under the minimum mandated area of 2 acres. Therefore, it was a requirement of the San Joaquin County Environmental Health Department to further investigate the causes for nitrate impact,which may be originating from an increase in housing density. It was determined that increased nitrate levels have probably originated from agricultural inputs. 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. [2] SUBJECT SITE AND STUDY AREA BACKGROUND INFORMATION It is important to note that the owner of the property has no intentions of building on any portion ofParcel 1 which contains the homesite, nor the Designated Remainder. The Designated Remainder is proposed to remain exclusively in almond production. The subject site is near the intersection of East Lathrop Road and the north continuation of Austin Road. The property consists of a Designated Remainder Parcel,with the homesite Parcel being split off. The Designated Remainder is to be 16.8 acres and Parcel 1 is to be 1.5 acres. The attached Tentative Map illustrates the orientation of the Parcels. The topography of the site is flat,with the actual homesite rising in elevation above the Designated Remainder acreage to approximately two feet. The existing septic system extends from the west side of the residence and travels south to the edge of the decline in elevation. There is no cause for concern regarding this change in elevation and the proper operation of the existing septic system. Surrounding land use consists of low-to-medium density single family residential housing,ranches and ranchettes. The subject property is located 2 miles east of the town of Manteca,with the study area composed predominately of agricultural production land,primarily almond orchards,vineyards, and row crops. Current zoning of the property is AU-20. The General Plan Designation is R.V.L. The property is not subject to inundation from the 100-year flood. (FIRM Panel No. 605 and 610). Na!(ey Ag Research