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b. At Hilo WWTP, one of the two pre-aeration tanks is severely corroded and has been <br /> out of service since at least 2016.The second grit screening tank is operable but <br /> exhibits corrosion. <br /> c. At Hilo WWTP, multiple gate valves at the headworks are severely corroded and <br /> inoperable. <br /> d. At Hilo WWTP,the rotating distributor arms at the two biotowers were significantly <br /> corroded with blocked outlets and leaks that were observed during the 2019 <br /> inspection. Respondent did not correct this problem until November 2021, when <br /> Respondent replaced the distributor arms. <br /> e. At Hilo WWTP,two of the four recirculating pumps at the biotowers were inoperable <br /> and were replaced with temporary trailer pumps from approximately 2015 to 2021. <br /> Respondent did not correct this problem until 2021, when Respondent replaced all <br /> biotower pumps. <br /> f. At Hilo WWTP,the isolation valve at the biotowers waste activated sludge (WAS) <br /> pumps is no longer operational, therefore the recirculation rate of waste activated <br /> sludge is unknown and cannot be controlled. <br /> g. At Hilo WWTP, sludge clumping was observed floating in the clarifiers during multiple <br /> inspections from approximately 2013 to 2021, indicating improper operation of the <br /> clarifiers. <br /> h. At Hilo WWTP,the sludge digesters are severely corroded and the gate valve is <br /> inoperable.The inoperable gate valve prevents isolation of the two digesters, and <br /> therefore the digesters cannot be cleaned and maintained. <br /> i. At Hilo WWTP,the floating roof of one of the two sludge digester tanks became stuck <br /> when an overtopping of the sludge occurred, preventing the roof from operating <br /> properly and preventing maintenance of the digester. <br /> j. At Hilo WWTP,the roofs of both digester tanks are significantly corroded,which <br /> prevents maintenance of the tanks due to unsafe conditions. <br /> k. At Hilo WWTP, the boiler for heating the sludge digester tanks has been inoperable <br /> since at least 2016. <br /> I. At Papa'ikou WWTP, the influent grinder screen has been inoperable since at least <br /> 2016, causing Respondent to rely on a secondary bar screen, allowing small materials <br /> such as sanitary wipes and small plastics to pass through the bar screen and cause <br /> maintenance problems. <br /> In re County of Hawai'i, Docket No. CWA-309(a)-24-003 Page 6 of 17 <br />