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9 ENVIRONMENTAL REPORT <br /> <br />Biosolids Management Facility (BMF) <br />Digested biosol/ds holding are pumped through a <br /> from <br /> the <br /> tanks <br /> 5.5-m~e <br /> force <br /> main <br /> into <br />one of four, 6.25-acre facultative sludge lagoons at the BMR The lagoons are designed to <br />maintain an aerobic layer free of scum or membrane-type film buildup. The aerobic layer is <br />maintained by controlling annual organic lagoon loading at or below a crihcal area loading <br />rate, and through use of surface mixers to agitate and mix the aerobic surface layer. <br /> <br />The aerobic surface layer of the lagoons usually is between 1 and 3 feet deep and supports a <br />dense population of algae. Dissolved oxygen is supplied to this layer by algal <br />photosynthesis, by direct surface transfer from the atmosphere, and by the surface mixers. <br />Sludge bacteria use the oxygen to aerobically degrade organic matter. Digested sludge <br />solids settle to the bottom of the lagoons and continue decomposing anaerobically. <br /> <br />Supernatant flows via 10-inch-diameter pipes to a sanitary sewer and is then conveyed to <br />the WPCF (Management Plan for a Dedicated Biosolids Land Application Site [CH2M HILL, <br />2003]). <br /> <br />Seasonal industrial Waste Facility <br />The SIWF is a 290-acre site with 190 acres of irrigated cropland and 25 acres of non-irrigated <br />cropland. The total farmable area is approximately 215 acres. The site is located <br />approximately 1 mile northeasterly from the BMF and 5 miles north of Eugene. It is <br />currently developed with three 60-acre circles and one 16-acre circle of grass. The irrigation <br />system consists of 1996 Pierce center pivots. <br /> <br /> A 14-acre, 57-MG storage lagoon is also located at the S1WF site. The lagoon no longer <br /> receives influent cannery waste but still contains residual waste from prior years infiuent. <br /> Potential future uses for the lagoon include effluent equalization/storage, BFP filtrate <br /> storage, and facuttative sludge lagoon supematant equalization/storage/treatment. <br /> <br /> The SIWF was built in 1983 to avoid high-strength orgardc waste loads into the WPCF on a <br /> seasonal basis. Since the purchase of the land by Eugene-Springfield, the SIWF has not been <br /> used for any land application or liquid storage of non-cannery wastewaters, as the site has <br /> been dedicated solely to Lrrigation of cannery wastewater. The land has been leased to a <br /> local farmer and forage producer to ensure that the site is continuously farmed using sound <br /> farm management practices. <br /> <br /> Biosolids Disposa~ - Biocycle Farm (Poplar Farm) <br /> The Biocyde Farm currently is in development. This facility is located next to the BMF and <br /> along Highway 99 between Awbrey Lane and Meadowview Road. The Biocycle Farm will <br /> provide IVI-WMC with a land application site for beneficial recycling of biosolids. It is <br /> scheduled to be constructed in three phases and completed by 2008. Phase I will involve <br /> planting 160 acres of poplar trees and is scheduled to be operational by Surnmer 2004. <br /> Stabilized dewatered shidge from the BMF lagoons will be applied to the Biocycle Farm to <br /> provide the necessary nutrients for the poplar trees. This is anticipated to be the preferred <br /> method of biosolids reuse over the current practice of hauling to cooperative farms. <br /> Additionally, the Biocyde Farm will provide the flexibility to pump stabilized l/quid sludge <br /> directly from the BMF lagoons to the Biocyde Farm for land application of liquid biosolids. <br /> <br /> MWMC_90_REV14 DOC ~3 <br /> <br /> <br />