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Mr. Bruce Perrson/T.G.S. Trucking <br /> October 27, 1999 <br /> Page 2 <br /> The second issue pertains to the drainfield replacement area in the event of failure. Due to area <br /> constraints, a filter bed is recommended. Considering the calculated leachline length to be 280 <br /> lineal feet, the following filter bed area is required: 280 ft x 3 = 840 sq. ft. Two sites are <br /> proposed for filter bed areas, both based upon 1001/o replacement. These areas are delineated on <br /> the attached Site Plan prepared by Wong Engineers, Inc. The primary filter bed area is located <br /> west of the office in an existing lawn area. The secondary filter bed area is located to the <br /> northeast of the office, in the corner of a fenced area that is presently covered in AB. If there is <br /> failure of the present septic system, it will be a requirement of the Environmental Health <br /> Department to install a flowmeter in conjunction with the filter bed. With regard to nitrate <br /> loading, if the present system should fail, the installment of a filter bed would actually be <br /> beneficial in reducing potential nitrate impact for two reasons: First, shallow placement of <br /> pressurized effluent lines will allow evapotranspiration during favorable weather conditions. <br /> Secondly, the septic effluent is distributed over a larger area than as a point source, such as from a <br /> sump. <br /> We trust this additional information is satisfactory for the Environmental Health Department. If <br /> there should be any questions, or need for additional information, please contact the undersigned. <br /> •r_,e <br /> Respectfully submitted, <br /> .� <br /> . CH- <br /> VALLEYAG RESEARCH 04675 <br /> /' �V iti b. <br /> Expires:d- <br /> p <br /> Don Che ey, R.E.A. 'T� o��` <br /> Of CALi{- <br /> vaffey Ag Pfsearck <br />