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NCI International, LLC

NCI International Helps Clean Up San Dieguito Reservoir

LAS VEGAS, NV—October 17, 2007—NCI International, LLC today announced that the water treatment project at the San Dieguito Reservoir in Rancho Santa Fe, California (Santa Fe Irrigation District - SFID) has performed well above expectations.   The company was selected in early 2007 to design and supply a unique set of equipment for in-situ biofiltration and lake aeration to control elevated levels of manganese, metals, organics, algae blooms and objectionable odors at the water supply reservoir.


San Dieguito Reservoir is part of the Santa Fe Irrigation District which is charged with supplying water to the community of Rancho Santa Fe, the City of Solana Beach and a portion of Fairbanks Ranch.  The reservoir covers over 35 acres and contains over 287 million gallons of water.  The reservoir receives water from the regional Lake Hodges nearby which is plagued with high elevated level of Manganese, iron, and severe undesirable algae blooms.  The reservoir is anoxic in the deep zones and regularly experiences poor water taste, objectionable odors, and recurring fish kills during the hot months.  


Phase I of the water treatment system is composed of a series of 7 bottom deployed lake aeration disks (Air Diffusion System-ADS®) individually fed by low pressure shore based compressors to provide complete mixing and uniform aeration of the anoxic thermal layer in the lake.  The unique ADS lake aeration disks, each releasing over 1 billion bubbles in the 20 thousandths of an inch size per day,  provide for gentle but highly effective aeration and turning over of the water column without churning up the digestive anaerobic sludge layer at the bottom.  Within days of the installation of the lake aeration equipment, the water quality in San Dieguito Reservoir had significantly improved with across the board reduction of Manganese and soluble metals, maintained high uniform dissolved oxygen level, with better clarity, and almost no detectable odors in the water or in the air above the reservoir.  Sonar inspection of the reservoir showed fish immediately took advantage of the improved environment to gather in large number in the water column around the aeration influence zones.  During the summer of 2007, despite temperature several times exceeding triple digits Fahrenheit for days the reservoir reported no fish kill as were often seen in previous summers, nor experienced blue green algae bloom or odor release.


Phase II of the water treatment system will comprise the deployment of an array of bottom deployed, biofiltration film (AquaMats® - Meridian Aquatic Technology).  The AquaMats supply vast hold fast microbial surfaces with specific conditions needed by waste digesting benthal microbes and algae to develop and stay in exponential growth phase.  Integrated with the bottom deployed ADS aeration system, the AquaMats form a key system component for high throughput biodigestion and efficient removal of organic nutrients, ammonia, and phosphates from the water.  The AquaMats are scheduled to be installed by SFID in early 2008.  On installation of the AquaMats, the reservoir will have a larger, more robust capability to receive and biologically process large volume of incoming water from Lake Hodges even with severe fluctuation of organic loads.