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KLEINFELDER 3. PRESENT AND PAST USE The proje site will be used as 41pWo-)tog orapThe site was previously used as a residence. It is unknown to us whetr ostructures were located on the parcel in the past. Based on a historical aeriah review anda review of USGS maps, it appears that the site has been used for agricultural purposes for many years. We saw no evidence that the site has been used as a dairy. We know of no other past uses of the site at this time. 4. SEPTIC PERMITS AND PERFORMANCE SJCEHD fil re searched to identify septic permits at parcels in the, project vl Ity. There wa ne ermit on file for the water wetf on the subjeet parcel No per ' was found for h eptic system on the site. Three additional permits we viewed for parcels located adjacent to or near the subject-property.-'These permits were for / installation of a septic system and repairs/additions and destruction of existing water wells. The permitted sewage disposal systems were for covet or—nal nsep Ic/leach field systems. A summary of the permit information is presentedtP!"� nd copies of the permits are attached. 5. FIELD INVESTIGATION In ord valuate the subsurface conditions at the project site, on September 9, 2007 one s it profile boring was drilled within the proposed leach field area to a depth of abo -� feet below existing site gra The boring was drilled using a Simco 2400 truck-mounted drill rig equipped with 6-in h O.D. solid-stem auger. The approximate boring location is presented on Plate 1. A representative with our firm maintained a log of the boring and visually CI ssifie a ncountered according to the Unified / Soil Classification System (see 4). "key t the Log of Boring is presented on Plate 5; the Log of Boring is presented oPlate 6 Following completion of the soil profile b � , percolation test holes P-1 and P--2'were installed within the proposed leach field area at depths of about 3 and4% feet below site grade, respectively. The approximate percolation test hole locations are presented on Plate 2. Following drilling, the sides of the test holes were scored, and significant loose material was removed from the bottom of the hole. The percolation tests were l then prepared by first placing about 2 inches of fine gravel at the bottom of the holes and installing a 4-inch diameter, perforated PVC pipe. Before noon on September 5, / 2007, about 12 inches of water was placed in the holes for pre-soaking. On September 6, 2007, the percolation tests were started at about 9:30 AM in accordance with SJCEHD accepted guidelines, using clear potable water. Neither of the holes exhibited sloughing or caving. The holes were empty of water prior to testing. From a / fixed reference point (a marked location on the side of PVC pipe), the drop in water 86892.G01/ST07R953 November 21,2007 0 2007 Kleinfelder Page 2 of 7