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r0_ va - r(Y � v? -qy_t�? FALL CREEK ENGINEERING, INC. ,-me-� Civil• Environmental• Water Resource Engineering and Sciences 4 7 3 to-) 7�r1 rw� AfJ Tel.(831)426-9054 P.O.Box 7894,Santa Cruz,CA 95061 Fax.(831)426-4932 February 15, 2004 Timothy O'Brien C�Fc Waste Discharge to Land Unit California Regional Water Quality Control Board FEB 2 3 2004 Central Valley Region 11020 Sun Center Drive, #200 ENVIRONMENT CES H PERMIT/SERVICES Rancho Cordova, CA 95670-6114 Subject: Response to Request for Additional Information Jessie's Grove Winery, Lodi, San Joaquin County Dear Mr. O'Brien: On behalf of Jessie's Grove Winery, Fall Creek Engineering(FCE) has prepared this letter and the enclosed revised Report of Waste Discharge and accompanied plans in response to your request for additional information dated 18 July 2002 and 19 December 2003. The following items are direct responses to the RWQCB request for additional information. The numbered paragraphs correspond to the bullets in your request. (1) The wetland and pond have been deepened to provide for a minimum of two feet of freeboard during the average and 100-year rainfall years. There was a discrepancy between the Report of Waste Discharge (RWD)prepared in April 2002 and the Engineering Report prepared in May 2002 due to FCE's revisions of the design plans in the intervening time. These discrepancies have been rectified in both the revised design plans and the report revisions. The revised stormwater detention area has a uniform depth of 3 feet with side slopes of 1:1. The detention area will have an operating depth of one foot with a 2-foot freeboard. The operating volume will be approximately 30,120 gallons with a freeboard volume of 71,410 giving a total storage in the detention area of approximately 101,530 gallons. Due to the infrequent use of the pond, the fact that the wastewater entering the pond will be predominantly treated stormwater, which will overflow in the winter months, FCE does not anticipate any deleterious algal growth or low dissolved oxygen problems in this pond. (2) Because the wetland will also receive stormwater runoff from the winery processing area that will contain a low concentration of total dissolved solids. This additional freshwater stream will act to flush the wetland and reduce the ability of salts from concentrate in the wetland. FCE has performed mass-balance calculations that estimate the concentration of salts flowing into and out of the wetland. The results of the calculations are presented in the revised Report of Waste Discharge.