SU0006146_SSNL - Laserfiche WebLink

Home Browse Search

Thomsen Farms Vernalis RanccSSS Addendum 1..0e Page 2 of 3 Our Project Number: E07219A December 26, 2007 bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. "Pea gravel"was then used to backfill in the annular space. Presaturation of the percolation test holes occurred on December 20, 2007. The depth of water used to pre-soak was 12 inches above the bottom of the boring. Condition of Borings After Presaturation After the 24-hour soak period, the presaturated hole was found to be intact and dry on December 21, 2007. Percolation Test Procedure A percolation test was conducted for the boring on December 21, 2007 in accordance with the requirements of the EHD. A percolation tests with a duration of four hours was performed for the hole. The last half an hour of the test was observed by Ted Tasiopoulos, 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 hours. Percolation Test Forms and Results The completed percolation test form is attached to this letter. 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. 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 test are summarized in the table below. Table 1. Sum ary of Percolation Tests Test No., Percolation Test Percolation RateTest Duration Comments Date Tested Depth (ft.) (minutes/inch) (see notes) P-9(shallow) 3.5 5.3 4-hr Satisfactory perc rate 12-21-07 i� Note: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch. ,..44 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02007 Neil O.Anderson&Associates,Inc.