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September 3, 2004 NOA Project Number: E04025A Page 6 We believe the sewage reduction factor for this site should be about 10 percent(0.10) based on the proposed septic tank sizes. If the percolation tests rates obtained were representative of the soils on the site, it is estimated that the average 5-ft diameter seepage pit should dispose of 290 gal/day of effluent over the long term. Tank Sizes We recommend a 1,000 gallon tank size to replace the existing eight septic tanks around the trailer park. Each 1,000 gallon pumping station will pump untreated sewage to the main 24,000 gallon tank battery. The existing tank at the store should utilize a pump station to move effluent to the tank battery. The existing old tanks should be abandoned with the exception of the store septic tank. Each pumping station should have a 30 gallon per minute sewage pump with panel 1 and alarm. Please refer to Sheets 2 and 3 for more details. The tank battery was sized to achieve a retention ratio of 2.0 to 2.6 depending on the occupancy of the park. With the average daily flow of 11,650 gallons per day, we estimate that 24,000 gallons of tank size should be installed. During other less busy periods of the year, we expect X 2--p the retention ratio to increase to about 2.6 which represents about 9,000 gallons per day. The Z�� 300 tank battery should have a duplex pump with two (2) 50-gpm pumps and alarm panel. lC Leaching Pits The amount of leaching pits determined for the site is 40. The pits should be 5 feet in diameter and drilled to a depth of 25 feet. This recommendation is made based on the park's peak average daily flow of 11,650 gallons, sewage reduction factor of 0.10, and the resulting rate of 290 gal/day per pit. 11,650 gal/day/290 gal/day/pit = 40 pits Based on the limited amount of room available, we are recommending the placement of the pits below the roads since the repair area has been used for past repairs. Summary The attached engineering plans indicated our proposed engineering plans for the repair of the septic system for the CLIP. A 100 percent repair area is estimated to exist below the remaining roads combined with the reuse of the park's old designated repair area easement. This letter and attached plans should be submitted to the EHD with a report review fee of $465.00. The EHD has indicated that the proposed septic system repair will require special consideration from the department for approval.