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VALLEY OPERATORS a water and wastewater operations company Morada Mobile Home Park Trickling Filter rehab project We are proposing to rehabilitate the existing trickling filters (circa —1950's construction). The existing trickling filters were constructed of galvanized metal framing, fiberglass paneling, and redwood plank filter media. Over the years the redwood media has rotted out and disintegrated to the point no functional media remains inside the filter housing. We are proposing to replace the galvanized and fiberglass hosing with a plastic and aluminum box and frame. The redwood media will be replaced with 30 ft3 of Vari-PAC RD30 polypropylene random dump media. This plastic media has 30 ft 2 surface area / ft3 of media resulting in 900 ft 2 surface area available for bacterial treatment of the wastewater. This is a significant increase in efficiency and treatment for this equipment. To put this in perspective, to get 900 ft 2 of surface area using redwood planks, we would have to install sixty-two 6ft x lft x 2 inch redwood planks. Wastewater treatment plant trickling filter design criteria consider a high rate trickling filter be sized to treat 230-900 gpd per ft 3 of filter media. With a planned installation of 30 ft 3 of media, the rehabilitated trickling filters should be able to treat 6,900 — 27,000 gpd of wastewater. The existing wastewater flow to the treatment facility is estimated to be around 5,000 gpd. As discussed, once the filter is completed, we'll perform side-by-side analysis of the remaining existing filter with the rehabilitated filter and compare the BOD nitrogen results. We anticipate the rehabilitated filter to show a significant reduction in BOD. Let me know if you have any questions, Thanks, Casey Valley Operators, LLC 1211 Como Drive Manteca, CA 95337