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2 <br /> JR Page 7 <br /> Consulting, Inc. April 6, 2009 <br /> b. <br /> Environmental• Engineering- Geology Project Number 2009007 <br /> • 1968—21466 Mann Rd, Acampo, CA—added two 80 foot leach lines. <br /> • 1968 — 21300 Mann Road, Acampo, CA— replaced system by adding two 80 foot <br /> leach lines. <br /> • 1972 — 21262 Mann Road, Acampo, CA — added one 50 foot leach line and one <br /> 25 x 33 dug pit. <br /> • 1975 —West side Mann Rd, north of Acampo, CA — added 50 foot leach line and <br /> 33" x 25 ft deep pit. <br /> 1964 - West side Mann Rd, north of Acampo, CA—added 100 foot leach line. <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/groundwater/) 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 18 and 25 feet below mean sea level (93 to 100 feet below the ground <br /> surface) and flows northeast at the gradient of 25 feet per mile in the vicinity of the site. t <br /> No ground water was encountered during the drilling of the boreholes to a depth of 25 feet below <br /> JR SQUARED CONSULTING,INC. ENVIRONMENTAL-ENGINEERING•GEOLOGY <br /> 6532 MCNEIL COURT,VALLEY SPRINGS,CA 95252 PHONE(209)772-3841 •FAX(209)740-4303 <br />