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� J2 Page 7 <br /> R Consulting, Inc. November 18, 2008 <br /> Environmentol• Engineering• Geology Project Number 2008021 <br /> • 13851 E Louise Ave, Ripon, CA—three 80 foot leach lines <br /> /General Area Septic Tank Repair History <br /> C/ se is repair permits were found in the general area during file review at the EHD on <br /> November 12, 2008. <br /> Description Of Proposed Or Expected Maximum Septic Tank Usage On Site <br /> The maximum expected septic tank usage for the site will be from the residential buildings. Any <br /> future septic system design should be based on the On-Site Wastewater Disposal Standards or <br /> other engineering recommendations. <br /> 4. 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 2008 and Fall 2007 maps are <br /> the most current maps available from the County. According to these maps (Plates A4&A5), <br /> ground water lies between 12 d 15Dfeetbove mean sea level (41 to 44 feet below the ground <br /> surf and flows north at the gradient of 7 feet per mile in the vicinity of the site. <br /> No gro water was encountered during the drilling of two boreholes to a depth of 10 feet <br /> below ground surface on November 18, 2008. <br /> Ground Water Contamination Issues in the Area <br /> Potential groundwater issues in the area consist of contamination from leaching of <br /> JR SQUARED CONSULTING,INC. ENVIRONMENTAL.ENGINEERING•GEOLOGY <br /> tv 6532 MCNEIL COURT,VALLEY SPRINGS,CA 95252 PHONE(209)772-3841 .FAX(209)740-4303 <br />