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Greg Burns - 2 - i 8 July 2002 of the first saturated zone is required for the RWD. Please provide information on the depth to groundwater and the quality of the first encountered groundwater. • Where will wastewater be discharged to if the stormwater pond overfills? Has San Joaquin County Public Works been consulted regarding the use of a stormwater pond for wastewater storage? Please provide a record of communication and Public Work's approval for such an arrangement. • Describe why the land application area is limited to 0.30 acres while Jessie's Grove has more available acreage for use with a land application system. The RWD described the winery as situated on a 320-acre parcel. The RWD reports that the hydraulic application rate is over 30 inches per month; in January the evapotranspiration rate is only 0.91 inches per month. Please provide a revised project'plan that allows for agronomic application of the wastewater. • There are discrepancies regarding the land application size. In the RWD Table 4.5 lists the land application area as 0.38 acre, RWD Section 4.3.1 lists the area as 13,000 square feet (0.30 acre), and Section 5.1 of the specifications report states 0.6 acres will be used. Please address the discrepancy and present corrected nutrient loading rates. • Describe in more detail and clarify the water balance calculations for the system in the RWD water balances (Tables 4.2 and 4.3). For example, in January the total wetland inflow value, minus the wetland evapotranspiration value, does not equal the wetland outflow value. After discussion with Andrea Wolfe of Fall Creek Engineering on 17 July 2002, I learned the discrepancy was due to assumptions used while preparing the water balance. Please revisit the assumptions and make the water balance assumptions consistent with the winery wastewater generation schedule. Wastewater storage capacities shall be sufficient to accept monthly wastewater flow and rainfall using the 100-year return annual precipitation total. • The loading rate of the wetland, as proposed in the RWD is above EPA guidance for wetlands and may result in nuisance odors. Describe how nuisance odors can be controlled. • The reports do not include an analysis of dissolved solid loading rates. Please present the loading rates and describe how the designed loading rates are protective of groundwater quality. The wastewater application description should demonstrate no groundwater degradation in compliance with the Antidegradation Policy, State Board Resolution 68-16. Please provide this additional information by 16 October 2002. Please call me at (916) 255-3116 if you have any questions regarding this request for additional information. TIMOT R. O'BRIEN Waste Discharge to Land Unit Lower San Joaquin River Watershed cc: Mike Huggins, San Joaquin County Environmental Health Department, Stockton Peter Haase, Fall Creek Engineering, Santa Cruz