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Mr.George Rose ' ,August 21,2001 Page 2 Percolation Tests A percolation test was.performed to demonstrate the capacity for soil percolation for use with an on- site septic,system:The depth of the test'was determined by setting the casing adjacent to the first 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-inch diameter,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 inthe 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.Shift 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 11100-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 I 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 X1.6 min/in 12 feet October 6,2000 New Parcel 20 2.15 acres 0.6 min/in 21 feet August 14,2001 New Parcel 29 2.15 acres 1.5 min/in 8 feet- August 14,2001 New Parcel 30 2.11 acres 13 min/in- - 7 feet August 17,2001 New Parcel-31 2.19.acres .5.6 min/in 11 feet August 14,2001 New Parcel 32 2.47 acres 0.9 min/in 21 feet August I4,2001 New Parcel 33 2.10 acres." 2.5 min/in 20 feet August 14,2001 New Parce134 2.10 acres 1.7 min/in 20 feet August 14,2001 FN;;Pa=el 35 2.10 acres I'.I min/in 20 feet August 14,2001 ' - t