SU-2601102_SSNL - Laserfiche WebLink

Home Browse Search

F S§3.0, etc. Permit applications on Newton Road exclusively(one-half mile radius study area) m the property were reviewed for repairs/replacements/additions to existing septic systems. rrounding OWTS systems consist of sparse commercial and industrial systems. Nine Permit plications were found in the EHD files, which can be considered a comparatively high number of Permits. From the percolation tests results and the underlying soil structure, a lifespan of 10-20 years for the proposed OWTS can be expected, provided necessary deep OWTS structures are installed and maintenance is performed. The project site has level terrain; consequently,there is no need to incorporate design considerations for slopes within the effluent disposal area. The disposal area will be installed parallel to Newton in the southwest corner of the project. B. SOIL PHYSICAL CHARACTERISTICS AND ANALYTICAL TEST RESULTS SSS§ 5.0,etc. The subsurface soil investigation began on December 14, 2025 in the referenced effluent disposal area as illustrated on the Site Plan in Appendix D. Three percolation test borings were drilled using a B24 Mobile Drill Rig in the locations illustrated. The Sample ID's are referenced below in Table 1. NLS§ 1.0,etc. Soil samples for chemical and particle size analyses were retrieved from 5 ft, 10 ft, 15 ft, 20 ft and 25 ft boring depths. As noted on the Laboratory Soil Analysis Report in Appendix C, soil textures are a clay soil down to five ft, then alternating strata of loam and sandy loam soil down to 25 ft. Chemical analyses of the retrieved soil samples quantify several constituents that influence nitrate loading for this project. The soil organic matter content is relatively high at the 5 ft depth, and decreases 55%at the 25 ft depth. This is to be expected since the property has not been under agricultural production for decades. The nitrate-nitrogen (NO3-N) concentrations show a typical concentration at the 5 ft depth, a significant 900% increase at the 10 ft depth, then a 99% decrease in NO3-N concentration at the 25 ft depth. A&L soil Laboratories stands by these test results. Soil pH is an important factor influencing nitrification and denitrification. In general, denitrification rates increase with increasing pH values. The pH values were neutral, except for the 10 ft depth which was acidic. The Cation Exchange Capacity(CEC) ranges between 38 meq/100g and 15 meq/100g which would be expected given the soil textures observed. A medium CEC of 15 meq/100g theoretically has a medium potential for adsorbing ammonium molecules. The clay content of the soils indicates an average percentage of clay to promote anaerobic conditions leading to denitrification and other biochemical processes, including the destruction of bacteria and viruses. The clay concentration at the 5 ft depth indicates a 40% clay content which contributes to these referenced favorable characteristics. NLS§ 1.0 etc., SSS§ 5.0 etc. Table 1 below summarizes the analyzed soil physical and chemical characteristics from the retrieved soil samples: Page -2JJ - Chesney Engineering, Inc.