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06/29;2006 13 :47 FAX r6006/027 For the purpose of our nitrate loading calculation, we have estimated the average waste/sewage flow per week for the project site as follows: (290 person seating capacity x 10 gal/person x 2 days) f (50 people/week x 10 gallperson) + (300 gal/day for = 8 4�alfweek existing horns x 7 days) 3. PRESENT AND PAST USE The majority of the project site is currently in the grading phase of construction, with an existing single-family residence located at the northeast corner of the property. No other structures are known to have existed on the parcel. Basad on a historical aerial photograph review and a review of USGS maps, it appears that the site has consisted of a fallow field and the existing residential structure 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. 4. .SEPTIC PERMITS AND PERFORMANCE SJCEHD files were searched to identify septic permits at parcels in tho project vicinity. There were no permits on file for the subject parcel. Seven (7) permits were reviewed for parrols located adjacent to or near the subject property. These permits were for now installations and repairsladditions to existing septic systems. The permitted sewage disposal systems were for conventional septicAeach field syst i summary of information obtained from the permits is presented on Plate 3, a d copies of the permits are attached. 5. FIELD INVESTIGATION In order to evaluate the; subsurface conditions at the project site, on May 17, 2006. one soil prefile boring was drilled within the proposed leach field area to a depth of about 15 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 2. A representative with our firm maintained a log of the boring and visually classified the soils encountered according to the Unified Soil 'E Classification System (see Plate 4). A key to the Log of Boring is presented on Plate 5 and the Log of Boring is presented on Plates 6. Following completion of the soil profile boring, a percolation test hole P-1 was drilled within the proposed leach field area at a depth of about 3.2 feet below site grade. The approximate percolation test hole location is presented on Plate 2. Following drilling, the sides of the test hole was scored, and-significant loose material was removed from, the bottom of the hole. The percolation test hole was then prepared by first pl=acing about 2 inches of fineg ravel at the bottom of the hole and installing a 4-inch diameter, 7132.1.G0l/STOUMM), Jung 2i1,2006 CupyiitOit 2006 Klcinfcfder,ins. PIg!.'2 of A f