SITE INFORMATION AND CORRESPONDENCE CASE 2

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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2003-0141 4_ CALIFORNIA NATURAL PRODUCTS WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY 19. The trickling filter operates ai 2,500 gpm. Wastewater is recycled approximately ten times through the filter. Because the process wastewater is high in BOD and low in nitrogen, the Discharger adds ammonium nitrate to the wastewater as a nutrient to optimize BOD removal in the trickling filter. 20. Wastewater samples are collected by a time composite sampling device, which collects a 100 ml sample every one-half hour from the 13,000 gallon discharge tank. 21. Solids collected on the screens are placed in containers. Solids that are collected in the aerated skimmer and DAF clarifier are dewatered by a combination of centrifuge and rotary screen. All solids are contained in bins, transported off site, and used for animal feed or landfilled. 22. RO reject water normally is directed to the 13,000 gallon discharge tank but can be discharged to the trickling filter if wastewater becomes too acidic due to an overload of sugar and the resulting organic acids. The Discharger can raise or lower the pH during the treatment process,but has rarely found it necessary to lower the pH. LAND APPLICATION SYSTEM 23. Wastewater is currently discharged to four land areas, a 3.5 acre landscaped area, a 9.2 acre landscaped area, a 17.6 acre land application area(will be reduced to 10.1 acres), and a 16.0 acre land application area as shown on Attachment B; which is attached hereto and made part of the Order by reference. A new 29.7 acre land application area will be developed for future use. The wastewater application areas are termed"landscaped"if they are planted with perennial grass or other decorative plants and"land application area"if they are cropped with plants such as wheat, barley, oats, rye, corn, or alfalfa. 24. In order to reduce the potential for generation of objectionable odors and to land apply the wastewater in a manner that is more protective of groundwater quality,the Discharger has proposed to increase the total land available for application from 46.3 acres to 68.5 acres. To do so,the Discharger is proposing development of an additional 29.7 acre landscaped area and reduction of the 17.6 acre land application area to 10.1 acres. The new configuration of the land areas are listed in the table below: Land Area Acres Comment Landscaped Area 3.5 Monitored to prevent runoff Landscaped Area 9.2 Bermed and monitored to prevent runoff Field No. 1 10.1 Previously 17.6 acres, sold 7.5 acres for other use Field No. 2 16.0 Wastewater delivered by pipeline Field No. 3 29.7 Wastewater delivered by pipeline 25. Wastewater will be delivered to the 16.0 acre and 29.7 acre land application areas via an underground pipeline within the County right-of-way.