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4se -1 RS NEIL O. AN, ZSON & ASSOC., INC. <br /> GEOTECHNICAL SERVICES-ENGINEERING LABORATORIES 22 N Houston Ln <br /> i <br /> Lodi, California 95240 <br /> W Lodi (209) 367-3701 <br /> Stockton (209)472-1091 <br /> ocFAX: (209) 333-8303 <br /> March 2, 1999 <br /> Nathaneil Haney <br /> Hunters Point Development, Inc. <br /> 5354 Quashnick Rd. <br /> Stockton, CA 95212 <br /> Subject: Addendum to Percolation Tests ���Z� <br /> Black Oak Estates <br /> Quashnick Rd. <br /> Morada, California <br /> Our Job Number: S9789b <br /> Dear Nathaniel: <br /> Per the request of Cella Barr Associates, Sacramento, California, additional shallow <br /> percolation tests were performed on the previously failing lots in order to locate a suitable soil <br /> stratum which would pass a shallow percolation test. This report is an addendum to our office's soil <br /> suitability study dated August 24, 1998,Job Number 59789. This report presents the results of our <br /> testing. <br /> The subject property consists of an irregular shaped 74 acre parcel located on Quashnick Rd., <br /> Morada,California. It is proposed to divide the property into 57, 1 acre single family house lots with <br /> access streets (see the Location Map, Plate No. 1, derived from the Tentative Subdivision Map <br /> prepared by Cella Barr Associates). There is one existing home site on the property which will <br /> remain as lot 10. The home site consists of a house and storage shed. <br /> As indicated in our soil suitability study,the upper 6 to 10 feet of soil encountered in the test <br /> holes uniformly consisted of a stiff clay which has poor percolation characteristics. The surface clay <br /> soils were generally underlain by alternating strata of clay,sandy clay,and clayey sand,all of which <br /> also had poor percolation characteristics. However, in several of the test holes excavated at the time <br /> of our original study,small stratums of sand were encountered but they were of limited thickness and <br /> not consistent. These small stratums of sand were encountered and are the soils in which we ran our <br /> shallow percolation tests. <br /> A shallow percolation test was performed on each of the parcels which failed to pass a <br /> shallow percolation test in our initial field study. The tests were performed in various locations on <br /> the lot. For approximate locations of the tests see the Location Map. Tests were performed <br /> according to San Joaquin County criteria. Tests were done in 4.0-inch diameter test holes excavated <br /> to a depth of 3 feet. Two inches of gravel was placed in the bottom of each test hole. A 2.0-inch <br />