SU0004666 - Laserfiche WebLink

Home Browse Search

(7A. omestic Well Water Test Results l water sample was obtained for analysis from a hose bibb adjacent to the domestic well that will serve both Mr. Rios' house and the winery. The well pump was allowed to cycle three times before the sample was taken to ensure the sampling of aquifer formation water. A plastic bottle was used for the nitrate sample and two glass VOC bottles,with preservative,were used for the DBCP/EDB sample. All three sample bottle were placed in a cooled ice chest and transported to A&L Labs in Modesto under the attached Chain of Custody. The groundwater sample reveals a nitrate concentration of 30 mg/L(ppm), or Below Detectible Levels (BDL) for both samples. The Maximum Contaminant Level (MCL) for nitrate is 45 ppm (as nitrate). Dibromochloropropane and Ethylene Dibromide(DBCP and EDB) was found to be Below Detectable Limits (BDL). Unfortunately, no well log was available for this well. However, a well log approximately one- quarter mile to the east of the project on Linne Road was found. This well log, found in Appendix G, illustrates intervening strata of clay and gravel. B. Alkalinity Requirements for Nitrification For nitrification to occur, alkalinity must be consumed. Nitrification consumes approximately 7.1 mg of alkalinity for every milligram of ammonia-nitrogen(NH4 N) oxidized. The nitrate-nitrogen loading calculations below are contingent upon the environmental factors required for nitrification to occur. Alkalinity in wastewater effluent plays a role in nitrification and is derived from the domestic water supply and the introduction of wastes to the wastewater. Water chemistry for domestic wells in this area range from 100 ppm to 200 ppm. Waste introduction into the proposed septic system may include small amounts of wine waste which will be acidic. Consequently, nitrification may be inhibited due to insufficient alkalinity from this introduction of acidic wastewater. C. Mounding Analysis Due to the fact that the groundwater is comparatively deep below the proposed location of the disposal area, Mounding Analysis is not required or necessary. If it is determined at some time in the future that mounding effects from the effluent encountering an unknown restrictive soil strata are preventing proper effluent treatment and disposal, the 100%replacement area may have to be activated. This may occur prior to failure of the primary filter bed. IV. SEPTIC SYSTEM OPERATIONAL CRITERIA, AND NITRATE-NITROGEN IMPACT MITIGATION A. Septic System Operation and Wastewater Disposal System - EHD Specifications The new septic system for the residential structure and the proposed winery facility has been sized for 400 gpd. This Average Daily Flow (ADF) is based on the premise that Mr. Rios is proposing to have four permitted wedding events at his winery during any given year. He cannot legally have any more than four events, such as weddings. Assigning 10 gallons for 40 guests, gives a maximum ADF of 400 gallons. Under EHD guidelines, any daily maximum flow must be used for sizing purposes. It is also acceptable to EHD to incorporate Mr. Rios' residential ADF into this 400 gpd from his two bedroom, one bath house. Chesney Consulting