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.a <br /> Daniel B. Reimer, MPH, Director <br /> ENVIRONMENTAL HEALTH DMSION <br /> P.O Box 8181-306-C Re"m Road <br /> Hillsborough,NC 27278 <br /> FAX#919-644.3006 <br /> Hillsborough Chapel Bill Mebane Durham <br /> 919-732-8181 919-968-4501 910-227-2031 919-688-7333 <br /> exL 2360 exf_2360 ca.2360 e#.2360 <br /> July 17, 1996 <br /> Mr. Bill Howington <br /> Camp Chestnut Ridge <br /> Q',3co W11F 1W- <br /> Efland,NC ZYz'+3-9rn2 <br /> Dear Bill: <br /> Recently we met to discuss problems and issues regarding the sand filter portion of the wastewater system serving <br /> the dining hall at the camp. As you know,the odors have been significant in the past causing complaints from the <br /> neighbors. We discussed several option the other day as attempts to address the odor problems. <br /> • Have Lex force the dosing pumps to activate at night,if possible. <br /> • The holes in the UP laterals should be increased to 1/4 inch in order to raise the scouring velocity of the force <br /> main without increasing aerosols. The Force main velocity should be increased to 2 feet(second which is a <br /> minimum delivery rate of 84 gpm for a 4"force main. <br /> • We discussed the possibility of covering the sand filter with a tarp,or screen,(such as a swimming pool cover) <br /> with a raised support in the center to shed rainwater. This would allow for removal to maintain the filter <br /> surface. <br /> • Plastic slats could be woven into the fence fabric in an attempt to catch some of the aerosols,although it is <br /> doubtful that the barrier would be high enough. We also discussed planting wax myrtles around the outside of <br /> the fence for a long-term strategy to catch the spray. <br /> • Lex mentioned the installation of misters to spray a deodorant to mask the odors. <br /> • It was generally agreed that lowering the distribution laterals onto the surface of the sand would do the most in <br /> controlling overspray. I am concerned about covering the laterals with gravel due to the inability to maintain <br /> the sand surface. As a trial,we discussed using one of the plastic chamber systems or polystyrene agreggate <br /> tubes to cover the laterals and to spray against the underside of the chamber. The advantage to this is that the <br /> laterals and the salad surface would be readily accessible for maintenance. In order to prevent effluent standing <br /> in the laterals,the middle hole of each lateral should be directed downwards onto a splash block to drain the <br /> laterals between doses. <br /> 198 <br />