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M e m o r a n d u m V <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION <br /> 3443 Routier Road Phone: (916) 361-5600 <br /> Sacramento, CA 95827-3098 ATSS 8-495-5600 <br /> TO: Stephen Boll FROM: Louis Pratt <br /> Associate Engineer Land and Water Use Analyst <br /> DATE: 21 September 1987 SIGNATURE: <br /> SUBJECT: WASTE LOADING AT DEGR00T DAIRY <br /> I have reviewed the file on the subject dairy and have made calculations on <br /> nitrogen and salt loading to cropland from animal waste and cheese processing <br /> waste. On the basis of the information provided, it appears that the acreage of <br /> cropland at the dairy is adequate to utilize nutrient from the combined waste <br /> load and also has the capacity to assimilate the salt loading. Calculations for <br /> the waste loading are as follows: <br /> 930 Animal Units (AU) x .4 lbs N/AU/day x .5 loss x .75 crop recovery x 365 <br /> days = 50,918 lbs N available to crops. <br /> Nitrogen test levels vary considerably on the cheese processing waste stream. <br /> Using the highest figure available and not allowing for N loss: <br /> 120 mg/1 = .001 lbs N/gal x 20,000 gals x 365 days = 7,300 lbs N available <br /> for crops. <br /> Salt loading from animal waste is calculated: <br /> 930 AU x 2.2 lbs TDS/head/day x 365 days = 746,790 lbs TDS/year. <br /> Salt loading from the cheese processing waste is calculated: <br /> 3,200 mg/l = .027 lbs TDS/gal x 20,000 gal x 365 days = 197, 100 lbs <br /> TDS/year. <br /> N TDS <br /> Animal Waste 50,918 746,790 <br /> Cheese Processing Waste 7,300 197,100 <br /> Total 58,218 lbs 943,890 lbs <br /> The acreage given for waste application is 250, which is double cropped with <br /> corn and oats. Therefore: <br /> 58,218 lbs N/250 acres = 233 lbs N/acre/year. Approximately 315 lbs <br /> N/acre/year can be utilized by double crop. Salt loading of 943,890 lbs <br /> TDS/250 acres = 3,776 lbs TDS/acre/year. <br /> LFP:sg <br />