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P p E R S NEIL O. A>,_,ERSON & ASSOCIATES, INC. GEOTECHNICAL•ENVIRONMENTAL•GROUNDWATER•INSPECTIONS•TESTING•LABORATORY SERVICES .n wFBSITE w uoanderson.cona CORPORATE OFFICE SACRAMENTO OFFICE = av EmA1L. noa@aoanderaoneorn 22 Hoaroan Lane 4221 Northgate Boulevard,Suite 6 d '\ CMCO_ (530)991-63W Lodi,California 95240.2405 Sacramento,California 95834-1227 Is S O G\P STOCRTON: (2N)472-1091 (209)367-3701 (916)929-9267 RANCHO COROOVA: (916)6311455 FAX(209)333-8303 FAX:(916)929-9269 August 12,2002 Our Job Number: LG02-140 Gary McEnerney Steele Realty and Investment Company,Inc. 8900 Grantline Road Elk Grove, CA 95624-1414 Subject: Engineered Septic System Design/Percolation Tests MS-0143,APN 008-110-23, Proposed Parcel 3 18333 East Liberty Road Acampo,CA Dear Mr. McEnerney: Per your request,our office has completed additional percolation testing and has provided an engineered septic system design for a new residence to be located on Proposed Parcel No. 3 of Minor Subdivision Application MS-0143 (See Plate 1). A Soil Suitability Study performed by our office has found this property was suitable for an engineered septic system due to low percolation rate measured (Neil O. Anderson &Assoc., 2002). The engineered septic system for proposed Parcel 3 was designed for a future 4 bedroom residence to be occupied by 5 people. The septic system leach field was located and staked by the property buyer. The proposed leach field was found to vary in elevation up to several feet. We believe a north-south layout would best follow the elevation contours. Our office has prepared an engineered septic system design based partly on the percolation rates measured during the Soil Suitability Study completed in May,2002 and mainly on additional percolation tests performed in August,2002. The system calculations,percolation test field sheets and system drawings are attached to this letter. I. Percolation Tests A total of five(5)percolation tests have been performed at two(2)different locations on the Parcel 3. The percolation tests performed in May,2002 are described in detail in the Soil Suitability Report prepared by our office. Three(3)additional shallow 3-foot deep percolation tests were performed in an area designated by the property buyer. The soil encountered was a gravelly to sandy clay loam. The results of these three(3)additional percolation tests provided the percolation rate for which the system design was based. For each of the 3-foot deep percolation test holes,the bottom 6-inches was filled with pea gravel. A 2-inch open ended and slotted PVC pipe was place on the bottom and backfilled with about 1-foot of pea gravel in the annular space. The hole was then saturated with 12 inches of water 24 hours prior to the percolation test. To run the test,the holes were filled with water to 6-inches above the bottom and the water drop was measured each 1/2 hour for a period of 4 hours.The additional percolation test holes for Parcel 3 were performed on August 1,2002. These tests were observed by Lisa Medina, inspector San