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DE RS NEIL O.ANDAN&ASSOCIATES,INC. PO� GEOTECMWICAL-ENVIRONMENTAL-GROUNDWATER•INSPECTIONS-TESTING•LABORATORY SERVICES SACRAMENTO OFFICE CORPORATE OFFICE D '^ 4221 Northgate Boulevard,Suite 6 22 Houston Lane Z I" CMCO (530)891-6304 Sacramento,California 95834 Lodi,California 95240 STOCKTON (209)412-1091 (916)929-9267 (209)367-3701 9S SO CRVP CHOCORDOVA (916)631-4455 FAX:(916)929-9269 FAX:(209)333-8303 November 10, 2003 Mark Schnabel 2624 Bristol Lane Lodi, CA 95242 Subject: Percolation Test 22750 Samra/Hayer Lane Acampo, CA Dear Mark, Per your request, our office has completed the drilling of a shallow and deep percolation test boring on the subject property. A percolation test was a requirement to move the septic system disposal field to a new location adjacent to your home. The percolation tests were performed in accordance with the method prescribed by SJC PHS-EHD. The percolation tests were conducted on the east side of the lot 181 feet from the well and greater than 50 feet from ditches as depicted on Plate 1. On October 7, 2003, a 25-foot deep soil profile boring was drilled with a Mobile B-53 rig using a 6 inch hollow stem auger. The soils were found to consist of a hard and cemented brown clayey silt to very fine sand from the surface to about 5 feet in depth. Between 5 and 25 feet in depth was a brown cemented silt with occasional sandy lenses. The deep soil profile boring was completed into a deep percolation test. A three(3) foot deep percolation test was drilled and set 10 feet south of the deep boring(Plate 1). Each of the soil borings were completed into percolation tests by adding about 2-inches of"pea gravel'to the bottom of each of each hole. Then, a length of 2" PVC pipe was placed to the bottom of each boring with extending up to the surface. About 6" of pea gravel was placed around the bottom of the PVC pipe to stabilize the side walls from caving and to prevent erosion while filling the borings. The percolation test holes were pre-soaked with 12 inches of water 24 hours prior to the percolation test. A four (4) hour percolation test was conducted on both the shallow and deep percolation tests on October 7, 2003. The end of each tests were observed by Ms. Lisa Medena, Inspector for SJC PHS-EHD. Please refer to the attached percolation test form for the field measurements. The following table summaries the results of the percolation test. Summary of Percolation Tests Boring Time Period of Test,Date Test Depth Percolation Rate Shallow Four(4)hour test,October 7,2003 3 feet No movement,Failed Test Deep Four(4)hour test,October 7,2003 25 feet No movement,Failed Test * Acceptable shallow percolation rate is less than or equal to 60 min/in. ** Acceptable deep percolation rate is less than or equal to 30 min/in. COO p%7