WORK PLANS - Laserfiche WebLink

Home Browse Search

' NOA Environmental Project Number E98191 1 ❑ Since expansion,discharges from the two facilities have increased to approximately 160,000 to 170,000 gallons per day(gpd),corresponding to an annual crush rate of ' approximately 30,000 tons. Flows are anticipated to increase to a maximum of 650,000 gpd(annual crush rate of approximately 100,000 tons). Maximum flows generally occur from August to October during the grape crushing season. ' ❑ Wastewater treatment is conducted using an Advanced Integrated Pond System ' (AIPS) and constructed wetlands, which cover 42 acres at the TRV West facility. The AIPS consists of four anaerobic/aerobic ponds,operated in parallel,for primary and secondary treatment. Each pond is approximately 365 to 190 by 12 feet in ' depth,covering an area of approximately 7 acres. The AIPS were constructed with 1 foot compacted clay liners and have riprap along the side wall to prevent erosion. There are four cells in each AIPS. Two of the cells serve as primary digester. The ' central cells provides deep aerobic treatment and the fourth cell serves as a clarifier. ❑ Wastes are injected into the deep anaerobic zone which is covered by a 4 foot layer ' of oxygenated water, aerated using three aspirating and two conventional aerators in each pond. Biological solids generated during aerobic treatment settle and decompose in the anaerobic zone. Accumulation of digested solids in the AIPS ' ponds may need removal every 10 to 20 years. ❑ The constructed wetlands occupy approximately 15 acres and are used for polishing, t storage and disposal of the treated wastewater. Wastewater is drained through weirs to the cattail wetland, to the aeration lake, to the bullrush wetland, with final ' discharge to the storage lake. The cattail and bullrush wetlands are divided longitudinally into two sections by a berm. The wetlands are approximately 2 feet deep with 4 foot deep trenches to promote mixing. An additional 4 acres are ' reserved for wetland expansion. The storage lake, which also serves for flow equalization and flood detention, covers 8 acres (10 feet in depth) and is located along the western edge of the constructed wetland. ' ❑ Excess wetland effluent from the storage lake is disposed of by irrigating on-site landscaping. The total area for landscaping will be reduced from approximately 18 acres to 6 acres, as crush capacity increases. ❑ Currently,only two of the AIPS and one half section each of the cattail and bullrush ' wetlands are used for wastewater treatment. All four AIPS and both sections of the two wetlands will be used when operations expand to design capacity. ' ❑ The AIPS and constructed wetlands were designed, installed, and are operated to prevent breeding of mosquitos. Depth,shape,and drainage factors were addressed ' in the design. Operational measures include aeration of the AIPS,debris removal, Page -3-