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-Mr.George Rose . August 21,2001 u Page t Percolation Tests A percolation test was performed to demonstrate the capacity far soil percolation for use with an on=. site septic system.The depth of the test was determined by setting the casing adjacent to the ftr'st sufficiently permeable material encountered(usually a thin sandy soil) found to a maximum depth of 21-feet. The casing used for the test was a 2-inchdiameter,PVC pipe with an open end on the top and bottom. Perforations were placed on the bottom 1 foot of the pipe. Two(2) :inches of"pea gravel"was placed in the bottom of the hole,the casing was installed,and one(1) foot of"pea gravel"was backfilled in the annular space. " A one (1) hour percolation test conducted on August 14 and 17, 2001 in accordance with the:. requirements of SJC PHS-EHD. The,placement of the test was in a location that could be used for a future septic system. The percolation test conducted on August 14,2001 was observed by Larry Godinho and the test conducted on August 17, 2001.was observed by Steven Shih of SJC PHS-EHD. An electric well sounder was used to measure the.water drop over an minimum.interval of 10 minutes during the tests.The units of the sounder are in feet with a 1/100-foot resolution. To convert to inches,the value on the field sheet was multiplied by 12. 'The percolation test was.conducted for.a,period of one hour. A satisfactory percolation rate was achieved for all the parcels. Table 1.presents a summary of percolation test information for the eleven(11)parcels conducted August 2001 and October 2000. , .Table 1. Summary of eleven(11)percolation tests. Parcel Number Size Percolation Depth of Test Date of Test . Rate New Parcel 17, 2.10 acres 10 min/in 21 feet October 6,2000 New Parcel 18 2.40 acres 1:6 min/in 19 feet October 6,2000 New Parcel 19 2.06 acres <1.6 min/in: 12 feet October 6,2000 New Parcel 20 2:15 acres 0.6 min/in 21 feet August 14,200.1 New Parcel 29 .2.15 acres 1.5 min/in 8 feet August 14,2001 New Parcel 30 2.11 acres 1':3 mintin 7 feet August 17,2001 New Parcel 31 '2.19-.acres 5.6 min/in 11 feet August 14,2001 New Parce132 2.47 acres 09 min/in 21 feet August 14,2001 New Parcel 53 .2.10 acres. 2.5 min/in 20 feet August 14,2001 New Parcel 34 2.10 acres 1.7 min/in 20 feet August 14,2001 New Parce135 2.10 acres 1.1.minAn 20 feet August 14,2001 �=soca