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October i212000 Job Number:LGOO-312 Page.9 Percolation testing of Parcels l6, 18, 20, and 22 was initially outside the scope of our. work plan based on our clients request_ When asked"if the percolation tests would be required for testing if the parcels were found unsuitable from a nitrate loading standpoint, Mr. Mike Huggins, Supervising Environmental Health Specialist'San Joaquin County Environmental Health Division, agreed that if a nitrate loading analysis indicated the lots were unsuitable due to the small acreage,that percolation test would not be required. Several days later,Mr. Rodney Estrada, Senior Environmental Health Specialist San Joaquin County Environmental Health Division, indicated that percolation testing for these lots would be required by the County. A decision was made.and discussed with Mr. Estrada to conduct a shallow percolation tests on the four small parcels at a depth of 3-feet to satisfy this requirement. Since no plans to develop parcels 16, 18, 20, and 22 exist, no extra effort was made to locate deeper sandy lenses that would increase the probability of achieving a satisfactory percolation rate. Mr. Estrada indicated this would satisfy the requirement of testing each parcel regardless of pass or fail. A percolation test was performed in each of the twenty-two(22)lots. The casing used far the test was a 2-inch diameter P i e with an o en en a to and bottom 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. Both a one(1) hour percolation test and a four(4)hour percolation tests were utilized to on October& and 10'x, 2000 in accordance with the requirements of San Joaquin County Environmental Health Division. The placement of the test was in a location that could be used for placement of a future septic system. The testing of each of the parcels was observed by Mr. Rodney Estrada, Senior registered Environmental Health Specialist, San Joaquin County Environmental Health Division. A satisfactory ercolation ,was measured for each of the parcel are suitable for conventional se Up.Ustems with leach lines and seepage pits with the exception of parcels 19, 20, and 22 (See Appendix). ,, �� 7 An unsatisfactory percolation rate was observed in three(3) of the fours mall`sized lots discussed previously. If it becomes desirable at some point to obtain satisfactory percolation rates for parcels 18,20, and 22,we believe this is possible with a deep percolation test set adjacent to a permeable unit. VII. NITRATE LOADING STUDY A build up of nitrates in the upper ground-water zones can cause a temporary blood disorder in infants called methemoglobinemia(blue baby syndrome). Serious and occasionally :9eRs 4 d h �t 1f�G