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jo e a so NEIL O. Ar.3RSON & ASSOCIATES, INC. <br /> c 1 GEOTECHNICAL•ENVIRONMENTAL•GROUNDWATER•INSPECTIONS•TESTING•LABORATORY SERVICES <br /> D N M BSRE: w .noanders mcom CORPORATE OFFICE SACRAMENTO OFFICE <br /> Z EMAIL: noa a(ljwande4macom 22 Hourton 1. 4221 Northgate Boulevard,Sum 6 <br /> CBICO: (530)8914304 Lodi,Califonm 95240-2405 <br /> V 9 g p G\ STOC N: (209)472-101 (209)367-3701 916 929-9267 ifomia 95834/227 <br /> B MO COa A: (916)631x455 FAx:(209)333-8303 F, (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 4, PA-02-55 <br /> SOIL SUITABILITY REPORT <br /> 18333 EAST LIBERTY ROAD <br /> ACAMPO, CALIFORNIA <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 /> • Two additional percolation tests were conducted on Parcel 4, not three <br /> tests. <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 /> • The paper used to cover the rock should be leach line paper, straw, or <br /> other approved filter material. <br /> • Signed copies of the percolation test forms are attached. <br />