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• percent of this precipitation percolates to the aquifer, the value of 9.22 inches average recharge of rainfall is obtained. The nitrate concentration of rainfall was estimated to be 1 mglL-N (Hantzsche and Finnemore). QuantitLand Quality of Domestic Wastewater A single-family residence used as a clubhouse, two barns, and 16 recreational vehicle trailers are currently located on the Site. According to the site plan prepared by Benchmark Engineering, nine of the trailers are to be relocated, and a new clubhouse will be constructed on the Site. Steve Faughn, owner of the Site, was interviewed by telephone on March 3, 2017. Mr. Faughn stated that the clubhouse on the Site has two bedrooms but is not used as a residence. He indicated that the 16 recreational vehicle trailers each have one bedroom. They are occupied only three days per week for 100 consecutive days during duck hunting season, amounting to a total of 42 to 45 days per the year, he said. When the trailers are in use, only one person occupies each trailer, and only half of the trailers are occupied at a time, he indicated. In addition to typical use, once a year a party is held at the Site which is attended by 40 to 50 people. Mr. Faughn stated that the new clubhouse will be constructed with two bedrooms but will not be used as a residence. The 16 trailers and new clubhouse will share a septic system, according to the site plan. • Once construction is completed, two people may begin living in the old clubhouse as caretakers of the property, Mr. Faughn said. Because Mr. Faughn has indicated that the new clubhouse will not be used as a residence and the trailers are only used periodically, for the purpose of this study two scenarios will be discussed, a typical use scenario and a full-occupancy scenario. Crites and Tchobanoglous (1998) list a typical flow rate of 50 to 70 gallons per person per day for an individual residence. The San Joaquin County Enviromental Health Department has indicated that maximum flow and double occupancy within each bedroom should be considered for nitrate loading analysis; as a result, a value of 140 gallons per bedroom per day has been selected (personal communication, January 6, 2017). For the guests at the annual party, a bar customer value of 5 gallons per customer (Crites and Tchobanoglous, 1998) has been selected as best matching anticipated use. The estimated flow values discussed here should not be used for the design and sizing of the septic system. The design and sizing of the septic system should utilize the San Joaquin County Environmental Health Department's On-Site Wastewater Disposal Standards which incorporate peak and surge flow factors. The estimates used in the On-Site Wastewater Disposal Standards may be greater than those discussed here. • LOGE 1708 Page 11