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[4] Cont. <br /> The predominate soil types encountered during percolation test <br /> drilling were silty clays and sands to the depth of the hardpan, <br /> which was at approximately four feet. Below the hardpan, however, <br /> a sand strata was encountered on parcels #1, #2 and #3 . The soil <br /> strata below the hardpan on Parcel #4 consists of a silty clay-sand <br /> structure as evidenced by the slower percolation rate for this <br /> parcel . <br /> The percolation tests conducted by Quality Control Inspection, Inc. <br /> were performed in accordance to San Joaquin Environmental Health <br /> Department regulations. The percolation test results can be found <br /> in the Appendix. <br /> The percolation tests conducted on July 2 , 1992 for the four <br /> parcels are discussed below: <br /> The percolation rate on Parcel #1 for the shallow (3811) test boring <br /> indicates virtually no percolation at 120 minutes/inch. Of the <br /> four parcels, this shallow boring was the only test to indicate any <br /> percolation. The shallow test for Parcels #2 , #3 , and #4 all had <br /> no percolation. These nonexistent percolation rates are indicative <br /> of the tests being performed on "top" of the hardpan layer. This <br /> layer can be considered to be almost impermeable in most site <br /> specific areas, as evidenced by these shallow percolation tests. <br /> The deep percolation test borings for Parcels #1, #2 and #3 <br /> indicates favorable percolation soil strata as revealed by the <br /> excellent percolation rates. The rate for Parcel #4 at 40 min/in <br /> can be considered a slower medium rate. <br /> 3 <br /> �[ )� *ality Control Inspection <br />