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Watts Winery %W 1 Page 7 of 14 Our Project Number: LGS090507 May 11, 2009 1.6.5 Percolation Test Procedure Percolation tests were conducted for the borings on March 24, 2009 in accordance with the requirements of the EHD. A percolation test with duration of four hours was performed for the tests. The last half an hour of the test was observed by Michael Escotto, Senior Registered Environmental Health Specialist, EHD. Measurement of the water level during the percolation test was from a fixed reference point on _. the PVC casing using an electric well sounder with a depth accuracy of 1/100th foot. All tabulated values on the field data sheet (appendix) are in decimal feet. After water drop was observed, the holes were checked for refill. The refill level was approximately 0.5 ft (6 inches) of water above the bottom level of the percolation test hole. The readings were taken every 30 minutes for a period of four (4) hours. 1.6.6 Percolation Test Forms and Results The completed percolation test form is included in the appendix of this report. A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth; a satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. A deep percolation test is defined as being between 3.5 and 25 feet in depth; a satisfactory percolation rate for a deep test is 30 min/in or less. One percolation test must demonstrate a satisfactory percolation rate within the proposed septic system disposal field of each parcel to utilize a standard septic system. Details of the percolation tests are summarized in the table below. Table 3. Sum ary of Percolation Tests. Test No., Percolation Test Percolation Rate Test Duration Comments _ Date Tested Depth (ft.) (minutes/inch) (see notes) P-1 (deep) 4.00 50 4-hr Failing perc rate 03-24-09 P-2 (shallow) 3.30 50 4-hr Satisfactory perc rate 03-24-09 03 (deep) 4.65 41.67 4-hr Failing perc rate 03-24-09 Note: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch. A satisfactory percolation rate for a"deep"test is less than or equal to 30 minutes per inch. 1.6.7 Discussion of Percolation Test Results The soils within the sewage disposal areas of the site have demonstrated a satisfactory percolation rate in accordance with the requirements of the EHD for the use of a standard septic system. Percolation test P-1 and P-2 were failing due to the restriction that a "deep" percolation test must demonstrate less than or equal to 30 minutes per inch percolation. 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02009 Neil O.Anderson&Associates.lac