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7 p E R gory NEIL O. A RSON &ASSOCIATES, INC. ._ <br /> GEOTECHNICAL•ENVIRONMENTAL•GROUNDWATER•INSPECTIONS•TESTING•LABORATORY SERVICES <br /> wmsrr> w .uoaudersoncom CORPORATE OFFICE SACRAMENTO OFFICE <br /> Z W F]NAR: noa@noa9derson.com 22 HowWn La 4221 Northpm Boulevard,Suite 6 <br /> O MCO: (530)89"3N Lodi, Sacramento <br /> ,California 95240-2405 S ,California 95834-1227 <br /> 4gS O %P STCc ON: (m9)47a]Wl (209)367-3701 (916)929-9267 <br /> RANCHO COR VA (916)631-4955 FAX:(209)333-8303 FAX:(916)929-9269 <br /> September 10, 2002 <br /> Mr. Ray Borges Our Job No. LG02-140 0 <br /> D <br /> (�IM(x E <br /> San Joaquin County PHS-EHD SEP 13 2002 <br /> 304 E. Weber Avenue,Third Floor ENVIRONMENT HEALTH <br /> Stockton, CA 95202 PERMIT/SERVICES <br /> Subject: REPORT ADDENDUM, PARCEL 1, 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 following7etter ✓C/J 't <br /> provides the clarifications regarding the subject project. Each of the following bullets is a <br /> response to the inquiry. In addition, our office has been requested to change the design for a four <br /> (4)bedroom home to a three(3)bedroom home. e <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 P " "�"`� <br /> be doubled. <br /> • A 100% designated replacement area is indicated on the revised site plan <br /> plate. <br /> • A percolation test for Parcel 1 indicated no drop for the last 30 minutes. <br /> The long term percolation rate for this hole is probably at least 250 (or <br /> greater)minutes per inch. 222 minutes per inch is not incorrect. <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 /> 7 <br /> 7 - YaP <br />