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October 7, 1999 Job Number. S99226 Page 6 between 0 to 2.5 feet followed by a brown clayey fine sand or brown silty sand to between 9 to 10 feet. A rusty-red colored fine to medium sand was found generally deeper than 9 feet and up to 19 feet deep. Six 36 inch deep "shallow" percolation tests were conducted to determine the percolation rate near the surface. Preliminary results from the six tests indicated a slow percolation rate of the near surface zone that would most likely not satisfy the minimum County requirements. The six shallow percolation holes were abandoned. Six deeper soil borings were drilled by Neil O. Anderson& Associates to locate a permeable soil suitable for the percolation test. The six deeper percolation hole borings were drilled to about 1 foot past the top of the rusty-red colored fine to medium sand located between 9 to 10 feet in depth. Several inches of "pea gravel"was placed in the bottom of the hole, 2 inch casing was installed, and several feet of "pea gravel"was backfilled in the annular space. The percolation tests were conducted on September 9, 1999 in accordance with the requirements of San Joaquin County Environmental Health Division. The tests were observed and approved by Ms. Adrienne Ellsaesser of the County Environmental Health Division. The following is a summary of results from the six leach field percolation tests: Percolation Test Summary ._ System 1 System 2 System 3 System 4 System 5 System 6 Test Depth 13.0 feet 12.5 feet 125 feet 145 feet 13.0 feet 13.5 feet (casing bottom) Adjustment 2.15 2.15 2.15 2.15 2.15 2.15 Smallest 6 in/ 15 sec 6 in/ 15 sec 6 in/30 see 6 in/4.06 6 in/5 see 6 in/25 sec Change or or or thin or or or 0.042min/in 0.042 min/in 0.083 min/in 0.676 min/in 0.014 min/in 0.069 min/in Perc_ Rate 0.09min/in 0.09 min/in 0.18 min/in 1.45 min/in 0.03 min/in 0.15 min/in Perc. Rate adjustment x smallest change(see appendix for details on adjustment). fklo iv& NPT r'0?dawanu& ON