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`W KLEINFELDER (page 13 of 25), each dwelling should be considered to have a water use of 150 gallons/house/day. For the purpose of our nitrate loading calculation, we have estimated the average waste/sewage flow per week for the project site as follows: 4 (2 residences x 300 gal/house/day x 7 days) = 4,200 gal/week 3. PRESENT AND PAST USE The project site is currently used as an almond orchard. The only structures know to a/ have existed on the parcel are two sheds, a concrete irrigation structure, a wind machine, and an irrigation well. Based on an aerial photograph review, the site appears to have been used for agriculture for at least the past 40 years. At this time, L we know of no other past uses of the site. 4. SEPTIC PERMITS AND PERFORMANCE 3, 1 SJCEHD files were searched to identify septic and well permits at parcels in the project vicinit�"�There were no permits on file for the subject parcel. Ten septic permits were reviewed for arcels located adjacent to or near the subject property. 3.3 ese permits were for new installations and repairs/additions to existing septic 3 y systems. The permitted sewage disposal systems were for conventional septic 3 tank/leach field systems, none with seepage pits. A summary of the permit information 7 is presented on Plate 4, and copies of the permits are attached. 5. FIELD INVESTIGATION ( J � ) e �� / �j. :J`6___ - -7 In order to evaluate the subsurface conditions at the project site, on June 14, 2005, one soil profile boring was drilled within the proposed lead field area to a depth of L about 10 feet below existing site grade. The boring was drilled using a Simco 2400 truck-mounted drill rig equipped with 6-inch O.D. solid-stem auger. The approximate boring location is presented on Plate 1. A representative with our firm maintained a P log of the boring and visually classified the soils encountered according to the Unified Soil Classification System (see Plate 5). A key to the Log of Boring is presented on Plate 6, and the Log of Boring is presented on Plate 7. Following completion of the soil profile boring, percolation test holes P-1 and P-2 were installed within the proposed leach field area at depths of about 3 and 7 feet below site grade, respectively. The approximate percolation test hole locations are also presented on Plate 3. Following drilling, the sides of the test holes were scored, and significant loose material was removed from the bottom of the hole. The percolation L tests were 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 June i L L 43498.G011ST05R1014 September 27,2005 Copyright 2005 Kleinfelder, Inc. Page 2 of 7