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[5] Continued. <br /> probably towards the northeast. However, irrigation wells in the <br /> area of the subject property can be a primary factor in groundwater <br /> directional flow. <br /> Since the Calaveras River rarely transfers a large volume of water, <br /> it is most likely liberating water instead of up-taking regional <br /> groundwater. In either case, consideration of protecting the river <br /> water from nitrate and related contaminant intrusion from the <br /> proposed septic system must be a priority. This will be discussed <br /> in the Conclusions section of this report. <br /> Nitrate and DBCP analyses were performed on a domestic well water <br /> located at 10699 Shelton road, approximately 1/4 mile north of the <br /> subject property. The results indicate a non-detect (ND) for DBCP, <br /> and a low level of nitrate concentration at 13 ppm. The Maximum <br /> Contaminant Level (MCL) for nitrate as mandated by the California <br /> Department of Health Services and the U.S. Environmental Protection <br /> Agency is 45 ppm. The tested nitrate concentration illustrates <br /> there has been a minimal impact upon the local groundwater from <br /> either agricultural practices such as nitrogen applications to the <br /> surrounding orchards, or from septic systems within the proximity <br /> of the domestic well . <br /> [6] PROPOSED SEPTIC TANK SIGHTING AND USAGE <br /> The deep, fairly sandy soil structure of the subject parcel is <br /> conducive to permeability. Although development has not been <br /> specified at this time, it is our opinion that both Parcels are <br /> fairly homogeneous in soil structure, and leach field area <br /> percolation testing should not be required for that specific site. <br /> However, the contractor or the Engineer-of-Record should verify the <br /> soil structure of the leach field upon emplacement . <br /> 4 <br /> =\ ('�a4y (.onbol IKSPWI. <br />