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P p E R s NEIL O. AN,.,,..RSON & ASSOCIATES, INC. v <br /> GEOTECHNICAL•ENVIRONMENTAL•GROUNDWATER•INSPECTIONS•TESTING•LABORATORY SERVICES <br /> y n WEBSRE: w .noandc wm CORPORATE OFFICE SACRAMENTO OFFICE <br /> Z W EMN noa@noarvl rs mcom 22 Houston Lane 4221 NonhBpte Boulevard,Suite 6 <br /> MM: (530)891d30x Lodi,Califonua 95240.2405 Sacral w,Califon is 95834-1227 <br /> +d S O G\P STOCKTM: (ID)472-1091 (209)367-3701 (916)929-9267 <br /> 1 MOWVk {916)631-0x55 F O:(209)333-8303 FAX (916)929-9269 <br /> September 10, 2002 <br /> Our Job No. LG02-140 <br /> Mr. Ray Borges <br /> San Joaquin County PHS-EHD <br /> 304 E. Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: REPORT ADDENDUM, PARCEL 3, PA-02-55 <br /> SOIL SUITABILITY REPORT <br /> 18333 EAST LIBERTY ROAD <br /> ACAMPO, CALL-IFORNL <br /> Dear Mr. Borges, <br /> As per the request of Mike Huggins in a letter dated August 29, 2002,the following letter <br /> provides the clarifications regarding the subject project. Each of the following bullets is a <br /> response to the inquiry. <br /> • The reference number for the Soil Suitability Study should be PA-02-55. <br /> • San Joaquin County Environmental Health is requiring the leach fields to <br /> be doubled. <br /> • A 100%designated replacement area is indicated on the revised site plan <br /> plate. <br /> • A percolation test for Parcel 3 indicated a drop of 0.01 feet for the last 30 <br /> minutes. The percolation rate for that interval is 250 minutes per inch. <br /> • Porosity is defined as the ratio of volume of void spaces of the material to <br /> the total volume of the material. Clean,well-sorted gravel has a porosity <br /> between 25 to 50%. The porosity of sand or gravel ranges between 25 to <br /> 35%. 33% (or 1/3rd ) is a reasonable porosity estimate for 1 to 2 inch, <br /> loose, clean gravel. For more information, see Fetter, C.W., 1988, <br /> Applied Hydrogeology; Merrill Publishing Company, Second Edition. <br /> 2,3.x}3 <br /> • The paper used to cover the rock should be leach line paper, straw, or �¢ <br /> other approved filter material. p <br /> rO <br /> • Signed copies of the percolation test forms are attached. <br /> aY w4f'40 . ' <br />