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1 ' The RV Park golf course is currently irrigated with recycled water generated at the WWTP. The golf course will be irrigated with water from the potable supply well once the subsurface dispersal system is operating. In addition,treated wastewater will no longer be stored in the golf course pond located near holes 2 and 3. Nutrient Use In Table 8, the anticipated flow rate from Table I and effluent quality values from Table 3 are used to the estimate organic loading rate. The organic loading rate is 0.07 lb/day per 1000 ft2 of trench sidewall area. Recommended organic loading rates for soil types encountered in test trenches near the proposed subsurface dispersal areas range from 0.15-0.40 lb/day-1000 ft2 [2]. The majority of soil in the test trenches was sand or sandy loam,which has a recommended organic loading rate of 0.40 lb/1000 ft2-day. The total land area of the dispersal areas is 0.69 acres. The organic loading an a land area basis is 6.5 lb/ac-day, which is well below the # recommended design organic loading of 100 lb/ac-day [3,4]. Samples collected from the WWTP in 2007 were not analyzed for nitrogen; however, the total J. nitrogen concentration of the WWTP effluent can be estimated from the nitrogen concentration of typical domestic wastewater and an estimate of nitrogen removal by the WWTP. Typical is domestic wastewater is expected to have a total nitrogen concentration of approximately 35 mg/L. The supplier of the WWTP claims that total nitrogen concentrations are reduced by 90 percent during the treatment process. To be conservative, the total nitrogen is assumed to be reduced by 50 percent, for an estimated effluent total nitrogen concentration of 18 mg/L. At peak flows,the nitrogen loading, based on the land area of the dispersal areas, is 9.7 lb/ac-day. The average NO3-N concentration observed in groundwater was 4.5 mg/L. Although the NO3-N concentration of applied wastewater is estimated to be greater than background groundwater NO3-N concentration, groundwater is not anticipated to be degraded by the application of treated wastewater. Groundwater was observed from 35 to 45 feet bgs in June and August. The NO3-N concentration in applied wastewaters is expected to be further reduced by soil adsorption and microbial activity before reaching groundwater. Drainage Stormwater runoff at the RV Park flows to Lone Tree Creek near the center of the site. By routing rainfall runoff through vegetated golf course features, runoff quality will be improved and flow rates will be attenuated. Treated wastewater will be discharged through a subsurface dispersal system, and will no longer be used to irrigate the golf course. The potential for Lone Tree Creek to be impacted by treated wastewater runoff is therefore eliminated. Treated wastewater produced at the WWTP will no longer be stored in the golf course pond near holes 2 and 3. Treated wastewater will be stored in two buried 20,000-gal fiberglass tanks prior to discharge at the subsurface dispersal area; therefore eliminating the potential for stormwater comingag with the treated wastewater. t f 4 t French Camp—Report of Waste Discharge 7 SAB027102 July 2008 n:\cab0271021documents\.rwd%frencheampnvdjuly rev final.doc