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OiDERS <br /> NEIL O. M,4ERSON & ASSDOC.,'„INC,. <br /> GEOTECHNICAL SERVICES-ENGINEERING O <br /> 22 Houston n <br /> Lodi, California 952 <br /> 4 <br /> 0 <br /> 7. Lodi (209) 367-3701 <br /> Stockton (209) 472-109 <br /> 1 <br /> or <br /> FAX: (209) 333-8303 <br /> July 26, 1994 <br /> Attn: Eric Sitness <br /> Baumbach & Piazza <br /> 323 W Elm <br /> Lodi, CA 95240 <br /> Subject: Percolation Tests <br /> Elizabeth Ford Property, MS 94-06 <br /> 11199 E Jahant Rd. <br /> Lodi, California <br /> Our Job #: S9438 <br /> Dear Eric: <br /> Per your request three deep pit percolation tests were <br /> performed on the subject property. This letter presents the <br /> results of these tests. <br /> Please find attached a summary of the soils encountered in our <br /> initial test holes. The site conditions and the soil profile <br /> encountered in our test holes made the running of the percolation <br /> tests difficult. A clean sand stratum was not encountered. In <br /> addition a perched layer of subsurface water was encountered in <br /> each of the test holes at a depth of 7 to 10 feet. This was likely <br /> the result of the on going irrigation of the fields. This perched <br /> water would flow into the test holes and prevented a test being ran <br /> at a deeper depth. Consequently, the three tests performed, were <br /> done at the most suitable stratum above this depth. <br /> Test holes were 4. 5 inches in diameter and at depths ranging <br /> from 5 to 7 feet. Two inches of gravel was placed in the bottom of <br /> each hole. A 2.5 inch diameter perforated pipe was then placed in <br /> each hole and backfilled with gravel. Test holes were filled with <br /> water 24 hours prior to running the tests. The last half hour of <br /> the tests readings were witnessed by a county health official and <br /> the test data obtained is attached. The percolation rates have <br /> been adjusted to account for the gravel and pipe backfill. <br /> Calculations for adjustments are on the test data sheets. A <br /> summary of the test results is presented next: <br /> Diameter of Depth of <br /> Test No . Hole (in. ) - Hole (in. )- Percolation Rate (min/in) <br /> PT-1 4.5 72 45 <br /> PT-2 4.5 60 19 <br /> PT-3 4. 5 84 56 <br />