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JAMES D ROBINSON, PE, CEG Page 4 <br /> September 1, 2010 <br /> _ Project Number 2010-1015 <br /> Description of Soil Lithology <br /> The soils described in the Soil Survey, The soils encountered where fine Sandy Loam <br /> (Tokay) to a depth of approximately 47 inches and Sandy- Loam (Acampo) to a depth of <br /> approximately 60 inches. <br /> Discussion of Soil Lithology <br /> The fine sandy loam and sandy loam soils encountered indicates that the material may be <br /> suitable for a septic system. However, a percolation test is an approved method for determining <br /> the type of system that may be required for the site. <br /> Mass Transport Properties of the Soils <br /> I <br /> The soil survey indicate the soils onsite are moderately permeable. Moderately permeable <br /> soils allow, slow to moderate infiltration of water through the soils. Treatment of the effluent <br /> occurs in the surface soils. Therefore, the longer the effluent stays near the surface the more <br /> treatment occurs. Under heavy effluent demand in permeable soils, it is possible that effluent <br /> contaminates could impact the first groundwater beneath the site. <br /> 2. GROUNDWATER ANALYSIS <br /> Groundwater Information <br /> Description Of The Depth And Gradient Of Groundwater In The Area <br /> The San Joaquin County Public Works Department Internal Groundwater Data Center <br /> (http://www.sjmap.org/groundwatero was reviewed. The spring 2009 and Fall 2009 maps are <br /> the most current maps available from the County. According to these maps (Plates A4&A5), <br /> JAMES D ROBINSON,PE,CEG ENVIRONMENTAL•ENGINEERING•GEOLOGY <br /> PHONE(209)542-5445•FAX(209)740-4303 <br />