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GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> AN D ASSOCIATES INSPECTIONS s TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> October 12, 2005 <br /> NOA Project Number:E05142A <br /> Tony Arnez OCT02005 <br /> Central Valley Construction ENVIRONMENT HEATH <br /> 1807 Navy Drive, Suite 2 PERMIT4RVICES <br /> Stockton, California <br /> 95206 <br /> Subject: Percolation Test for Septic System Disposal Field <br /> Mokelumne River School <br /> 017-090-52, 6.38 acre parcel <br /> 18950 North State Route 99 Frontage Road <br /> Acampo, California <br /> 95220 <br /> Dear Tony, <br /> Per your request, our office has completed one (1) shallow percolation test and one (1) deep <br /> percolation test on the subject property which is located at 18950 North State Route 99 Frontage <br /> Road, Acampo, California. The property size is 6.38 acres in size and is presently used for <br /> Mokelumne River School. Mr Tony Arnez requested that our office conduct a percolation test to <br /> satisfy a requirement of the Environmental Health Department for siting a new school septic <br /> system. <br /> The percolation test holes were located approximately five feet north of the designated leach field <br /> and five feet east of the septic tank which had already been installed. This location was <br /> determined by you to be at the site of the septic system leach field. <br /> The drilling of a three (3) foot deep shallow and a twenty-five (25) foot deep percolation test <br /> boring was conducted on October 4, 2005 using a truck -mounted deep rock drilling rig with a <br /> 4-inch diameter auger. The soils were found to be dark brown silty sand from the surface to a <br /> depth of twelve feet followed by a light brown sand to a depth of twenty three feet. At twenty <br /> three feet light brown moist sandy silt was encountered. No ground water was encountered in the <br /> hole. <br /> Within the boring, an inch of"pea gravel" was placed in the bottom of the hole to stabilize the <br /> side wall from caving and prevent erosion while filling the boring. A 2-inch diameter PVC pipe <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 0 209.367.3701 ■ 209.369.4228 fax ■www.noanderson.com <br />