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eno Two samples locations are proposed: one from the top of the filter bed, and at the end of the filter bed, as illustrated on the design plans. The Monitoring Program should begin after the Fescue grass has had time for its root structures to protand � owould be after onegrowing compartment I am po osgo am leand analyzeinflu influent from the first of the septic tank and an effluent vadose zone sample on the first of February,then at the end of February. Sampling and analysis would then be conducted again under the same protocol at the first and end of September. Analysis would include the organic, ammonia and nitrate fractions of nitrogen, along with total alkalinity and pH. Reference is made to the Regional Water Board OWTS Policy Document, Section 10.9.1,which states"Effluent from the supplemental treatment components designed to reduce nitrogen shall be certified by NSF, or other approved third parry tester." The vadose zone water samples will be analyzed by an Environmental Laboratory Accreditation Program(ELAP) Certified Laboratory, thus meeting the requirements of an approved third parry tester. VI. CONCLUSIONS AND RECOMMENDATIONS NLS§ 4.2. The shallow subsurface soils underlying the subject property where the new filter bed disposal area is to be installed, reveals a loamy sand soil structure with comparatively rapid permeability. Sufficient area exists for the 100%replacement area, as detailed on the Site Plans. NLS§4.1. The nitrate loading calculations show the resultant effluent from both the primary and second unit dwelling will theoretically possess a concentration of approximately 18.8 ppm as nitrate-nitrogen, which is 1.9x over the drinking water MCL. The application rate was determined from the perc rate to be 0.800 gallons/ftZ/day. The total filter bed area is 750 ft' of floor area. Therefore,the filter bed can manage: 0.800 gallons/ftZ/day x 750 ft' = 600 gpd. The on-site domestic well has a nitrate(as nitrate)concentration of 36.1 mg/L,which is 8.9 mg/L under the Maximum Contaminant Level (MCL) of 45 ppm nitrate. It is recommended that the kitchen sink should not have a disposal. All food waste should be handled as solid waste and disposed of in the garbage. It is also recommended the septic tank be pumped out every three to four years. In addition, due to the design of the D-box, it can retain particulate matter preventing discharge to the filter bed and should also be pumped out at the same time. NLS§ 4.2. All onsite wastewater treatment systems (OWTS)will eventually fail. A reasonably long lifespan of the disposal area can be expected based on the perc rates obtained and the incorporated design factors. Page -11 _J - Chesney Consulting