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C7"7�� B. REPLACEMENT AREA CALCULATIONS FOR EXISTING 4 BEDROOM MODULAR HOME AND FILTER BED REQUIREMENTS FOR PROPOSED 3 BEDROOM MODULAR HOME. Replacement Area Leachline Requirement for Existing 4 Bedroom: For the existing 4 bedroom modular structure, leachline requirement=400 ft Lineal Feet of Leachline(LFLL)/1600 sf absorption area. 400 LFLL was installed in June 2017. Replacement area consists of 280 LFLL in-between existing leachlines, as illustrated in red on the Site Plans; therefore, 400 - 280= 120 LFLL remains to fulfill the disposal area requirement. 120 LFLL x 4 = 480. 480 sf of filter bed area is needed to be equivalent to the remaining 150 LFLL. At the south end of the subject property, an 8 ft x 60 ft=480 sf filter bed can be installed. Filter Bed Requirement for Proposed 3 Bedroom: For the proposed 3 bedroom modular structure, leachline requirement= 300 LFLL/1200 sf of absorption area. Filter bed requirement=300 x 4= 1200 sf. A 36 ft E-W x 33 ft N-S = 1188 sf filter bed is proposed to be installed directly west of the modular structure. The replacement area is located east of where the modular is to be situated and is 1825 sf, a 52% increase over the area required. This area is composed of three rectangles for ease of future filter bed construction. C. SETBACKS FROM ADJACENT PROPERTY DOMESTIC WELLS The domestic well located directly south of the subject property at 21712 Corral Hollow Road is situated 125 ft south of the property line and therefore a 100 ft radius setback line was not drawn since it does not encroach onto the subject property. The domestic well at 11911 Clover Road encroaches 24 ft onto the property. The domestic well at 11895 Clover Road is the furthest east well and significantly encroaches onto the entire southeast corner of the subject property. One hundred foot radius lines for these properties are on the Site Plans and illustrate that although significant area is impacted, ample area remains for the proposed 3 bedroom modular home replacement area. V. CONCLUSIONS AND RECOMMENDATIONS SSS§ 5.4,SSS§ 6.7. The soils underlying the filter bed disposal area for the proposed modular home exhibit marginally unacceptable permeability in terms of the percolation test result. The soils actually possess excellent permeability when they are not saturated, and can be considered acceptable permeability for the short-term. Given the historical evidence of the repairs/ replacements/additions to surrounding onsite wastewater treatment systems, longevity of the onsite systems may not be as great as in other areas of the County. However, since the replacement area for the proposed modular is 52% larger than the required calculated filter bed area, overall system longevity should be substantial. If the designated replacement area must be activated, it is recommended that a water meter be installed simultaneously to measure house flow volumes. 8 Chesney Consulting