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LUCCA WINERY SOIL SUITABILITY & NITRATE LOADING STUDY APRIL 2013 V. CONCLUSIONS AND RECOMMENDATIONS It is recommended, that although the minimum leach field length consists of 3-85 foot leachlines (per EHD Document 42-01-004), as the necessary length of leachline, this application may not require that entire length. Per EHD Document 42-01-004, Section 9.3, Table 1 , a three bedroom home requires 3-80 foot leachlines in Sandy Loam Soil. This application of the septic system applies to a facility with one toilet, no employees and will be used on weekends during the wine processing period (late summer into early fall). The main use of the restroom will be mostly limited to that period of time. Furthermore, the restroom only consists of one toilet and one sink that will provide the wastewater to the septic system. Upon evaluation of this information, it is recommended that the septic system be no more than 2-80 foot leachlines rather than 3-85 foot leachlines. SSS§ 5.4, 6.8. The soils underlying the area proposed for wastewater effluent disposal show acceptable permeability at the shallow depths of 36 to 84 inches below grade. From the soil chemistry test results, it appears there is denitrification that occurs in the soil. NLS§ 4.2, SSS§ 6.7. Since this application is for a proposed wine making facility, additional nitrate loading at around the site is of concern and will be appropriately mitigated. Winery wastewater and solids will be disposed of in the manner prescribed in the Central Valley Regional Water Quality Control Board Report of Waste Discharge ,. Order No. R5-2009-0097-0075. Wastewater from the winery will be collected into a 2,000 gallon concrete tank and then pumped and distributed throughout the 20-acre Peach Orchard. Further, solids from the wine making process will be disked and incorporated into the soil throughout the 20-acre Peach Orchard. Upon evaluation of the operations of the facility and the proposed septic system, the nitrate loading impacts will be mitigated appropriately. NLS§` 4.1. . e nitrate loading calculations demonstrate that if the toilet in the building was flusf'ied a total 24 times per day (1.5 gals/flush x 48 flushes + 0.25 gals for hand washing = 42 gpd ADF), the nitrate loading remains well below the Maximum Contaminant Level (MCL). Considering that it is evident that there is denitrification occurring in the soil, as the depth increases; the minimal amount of nitrates that are being introduced into the soil, will be mitigated through denitrification as the wastewater -. is permeated through the soil. It is imperative that any food and food by-product wastes from the building are handled as solid wastes and not be disposed of into the septic system. This will prevent concentrated organic loading, prolong the lifespan of the wastewater disposal system and reduce nitrate loading potential. Page 1 13