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07/1 /2006 08:23 FAX laoo6/028 <br /> For the purpose of our nitrate loading calculation, we have estimated the average <br /> wastelsewage flow per week for the project site as follows: <br /> (290 person seating capacity x 10 gal/person x 2 days) <br /> + (50 people/week x 10 gallperson) + (300 gal/day for -,_8 400 calrweek <br /> existing home x 7 days) <br /> I PRESENT AND PAST USE <br /> The majority of the project site is currently in the grading phase of construction with the <br /> existing single-family residence located at the northeast corner of the property. No <br /> I other structures are known to have existed on the parcel at this time. Based on a <br /> historical aerial photograph review and a review of USGS maps, it appears that the <br /> site has consisted of a fallow field area and the existing residential structure for many <br /> years. We saw no evidence that the site has been used as a dairy. We know of no <br /> other past uses of the site at this time. <br /> 4. SEPTIC PERMITS ANIS PERFORMANCE <br /> S.ICEHD files were searched to identify septic permits at parcels in the project vicinity. <br /> There were no permits on file for the subject parcel. Seven (7) permits were reviewed <br /> for parcels located adjacent to or near the subject property. These }permits were for <br /> new installations and repairs/additions to existing septic systems. The permitted <br /> sewage: disposal systems were for conventional septiclleach field systems. A <br /> summairy of information obtained from the permits is presented on Plate 3. <br /> 5. FIELD INVESTIGATION <br /> In order to evaluate the subsurface conditions at the project site, on May 17, 2006, one <br /> soil profile boring was drilled within the proposed leach field area to a depth of about <br /> 15 feet below existing site grade. The boring was drilled using a Simco 2400 truck- <br /> mounted drill rig equipped with 6-inch O.D. solid-stem auger. The approximate boring <br /> location is presented on Plate 2. A representative with our firm maintained a log of the <br /> boring and visually classified the soils encountered according to the Unified Soil <br /> Classification System (see Plate 4). A key to the frog of Boring is presented on Plate 5 <br /> and the Log of Boring is presented on Plates 6. <br /> Following completion of the soil profile boring, a percolation test hale P-1 was drilled <br /> within the proposed leach field area at a depth of about 3.2 feet below site grade. The <br /> approximate percolation test hole location is presented on Plate 2. Foliowing drilling; <br /> the sides of the test hole was scored, and significant loose material was removed from <br /> the bottom of the hole. The percolation test hale was then prepared by first placing <br /> shout 2 inches of fine gravel at the bottoms of the We and installing a 4-inch diameter, <br /> 11324.GO11ST06R7S Jtsiy 13,2GOG <br /> Copyright 7006 KINnfrlder,Mt.. A�qt 2 of 0 <br /> r <br />