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[1] INTRODUCTION This Soil Suitability Study presents the resultsofour investigation concerning the soil strata and-' Ply ro undwater under the above-referenced project. The subject property is zoned I-W under General Ir. I/L. Although the subject property has had an on-site domestic well and septic system for several years, a new septic system was recently installed to replace the old system, and repair was q. done to the existing well._,Both procedures were done under permit from the San Joaquin County Environmental Health Department(PHS=EHD). i` 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. This Section states that the"leachfield area must be suitable ffor..a septic tank system pior`to issuance of final occupancy. Additionally, the sewage disposal system shall comply with the sewage standards of San Joaquin L!k. - County prior to approval. A percolation test that meets absorption rates of the Manual of Septic Tank Practice and/or EPA Design Manual for On-Site Wastewater Treatment and Disposal system was required for.this project. The perc test results indicate excellent soil for effluent absorption. Consequently, the PHS-EHD has stipulated this study be.completed to 1.) Determine if the - ,y indigenous on-site soils in the leachfield-area will accept and manage the septic effluent emanating _ from the septic system which will serve this business,and 2:)Provide recommendations based upon the environmental criteria encountered in this study. This'study also analyzed water from the domestic well.for nitrate andthe agrichemical DBCP/EDB concentrations in compliance with PHS- EHD requirements. —- [2] SUBJECT SITE AND STUDY AREA BACKGROUND INFORMATION The subject property consists.of one Parcel in a triangular area bound by Union Pacific and Southern Pacific Railroad tracks.Y It consists of 3.6 acres. The attached Tentative Parcel Map illustrates the orientation of the subject Parcel in relation to the railroad tracks.--- Top'og' raphy racks:-Topography of the site is flat;therefore,no design criteria for slopes had to be incorporated into this septic system. On-site stormwater drainage will be channeled to a central drain which drains water to a retention basin at the north corner of the property. Water congregation must.be prevented around building structures and the new septic system leachfield,'and it appears the site is in the H process of being graded to accomplish this. The property is located southeast 0f'the town of Tracy-in a rural;light industrial/agricultural area. -_ The study area consists predominately of agricultural production'land -primarily walnut orchards, - r row crops, and vineyards.,Directly_west of the property, is the Army Defense Depot. Surrounding structures consist of industrial buildings(e.g.,All-Pure Chemical,et al.)commercial, and very low density single family housing. _ Page-1- :-- - - Vaffey Ag research