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4 " [1] INTRODUCTION This Soil Suitability Study presents the results of our investigation concerning the soil strata and groundwater under the subject property referenced on the Title Page. Our study was completed to 1.) Determine if the homesite Parcel that is being split-off will have acceptable percolation of septic effluent originating from a septic system which will function properly for its anticipated lifespan, and 2.) Provide recommendations based upon the environmental criteria encountered in this study. This study also analyzed water from the on-site domestic well for nitrate and the agrichemical DBCP/EDB concentrations. Our 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. I [2] SUBJECT SITE AND STUDY AREA BACKGROUND INFORMATION The subject roe is currently zoned AG 40 and will consist of two Parce arcel 2 will be J property rh' Y the Van Vuren's residenti �1£c�xheix�uture house and will be 3.0 acre The remaining Parcel is referenced as Parcel 1 and will,be 86.89 acres, for a total 89.89 acres. These two Parcels are currently planted in pasture for the Van Vuren's organic dairy cows. The attached Tentative Parcel Map illustrates the designations and orientation of the subject Parcels and the locations of the percolation tests. As noted on the Tentative Parcel Map, th a is an existing irrigation well on Parcel 2. It is our understanding that this well is to be closed-in under permit and a new domestic well drilled to i serve the new residence. The topography of the site is flat; therefore, no design criteria for slopes would have to be incorporated into a possible repair or for the new septic system. On-site stormwater drainage will flow to the surrounding pasture land. The property is located east of the City of Stockton. The study area consists predominately of I agricultural production land - primarily vineyards, walnut orchards, row crops, and pasture land. Surrounding structures consist of low density single family housing, residential ranchettes and barns. Sewer hookups to the City of Stockton will be decades away and probably never. A review of Application Permits on file with the San Joaquin County Environmental Health Department shows there has been seven Applications for Repairs/Additions to septic systems within the one mile study area, with particular emphasis to houses on Gawne Road. All but one of these applications were for additional leachline drainage and seepage pits. Seven applications for septic system repair and additions within the study area can be considered a relatively high number. Although thhallow soils down to four ft consist of a silt cla /cla ilt and cemented silts hardpan, the deeper soils down to 25 ft are apparently conducive for acceptable, long-term sewage effluent management.T 1 vaffey Ag Research