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At the beginning of my inspection, we were joined by representatives of the City’s construction management firm, Harris and Associates (Sy and Buzz) and construction contractors, Kiewit Pacific Company (Amber) to review the construction stormwater BMPs that have been installed. I inspected the wastewater treatment plant for compliance with Waste Discharge Requirements Order No. R1-2006-0004, as well as the handling of industrial stormwater and construction stormwater. Construction Stormwater The wastewater treatment plant upgrade project started during Spring 2006 and is well underway. Harris and Associates (based in Novato, CA) has been hired as the construction managers. The main contact person at Harris and Associates is Michelle Leonard, P.E. (office: 415-878-0195; cell: 707-484-5123). Kiewit Pacific Company has been hired as the construction contractor. The contractor (Kiewit) submitted an NOI and prepared a SWPPP, which was available on-site. The contractor installed sediment control BMPs last spring, including silt fences and wattles between construction areas and drainage ditches, and drain inlet socks and sediment control bags on and near all drop inlets located on the WWTF site. These BMPs were still in place during this inspection. Several rainstorms occurred during October and November 2006, and it was raining lightly for about 12 hours prior to my inspection. The roadways and work areas being used by construction equipment have not been properly rocked in preparation for the winter season, and I observed that sediment is being discharged to the drainage ditch that flows through the property due to poor erosion control. Some of the turbid water is discharging to the creek that runs from north to south through the center of the property, some is pumped from a wet-well near the parking lot to, and some was collecting in a low spot of the facility. The turbid water that reached the ditches is currently ponding because there has not been enough rain to create continuous flow in the creek. There is also a large low-lying area on the site with a single drop inlet for drainage. A berm has been constructed to create a pond in the area that includes the drop inlet. The pond has been divided into two sections with an intermediate berm. The “pond” section with the drop inlet is dry and has retained the natural vegetation. The other half of the bermed area has turbid ponded water. The contractor discussed the idea of raising the level of the berms to create a deeper pond. He wanted to install a riser pipe to allow water to discharge from the ponded section to the section with the drop inlet. I told him that I would not approve of this idea, because even a deeper pond would not have sufficient detention time to allow the sediment to settle before discharge. I told him that he needs to work on erosion controls to prevent or minimize the amount of sediment being discharged in stormwater. There are two concrete washout basins in this low-lying area. Both basins are full of concrete and water that was on the verge of spilling over. The stormwater would not be discharged due to the berm that has been constructed around the drop inlet in this area, however, the condition of the area does not reflect well on the contractor’s stormwater practices. The contractor plans to reestablish concrete washout basins on a higher area of the site. I stressed the importance that the basins be sized properly and be located in an area that would not discharge to surface waters. We discussed the need to provide adequate rock on all road surfaces and maintain the sediment control BMPs with daily inspections and routine cleaning during the rainy season so that they can remain effective. There are two areas on the site where turbid stormwater is being returned to the headworks: the excavation around the secondary clarifier construction area and an area adjacent to the biosolids handling area. The stormwater pumped from the secondary clarifier excavations is pumped through a Baker tank before the water is returned to the headworks. I inquired as to whether pumping the stormwater through the headworks would put a hydraulic or pollutant load on the plant that could cause non-compliance. The WWTF operators did not think this would happen but will reevaluate the anticipated volumes and loadings. Industrial Stormwater Storm water from the area northeast of the treatment process area is captured in a basin, then pumped to a drainage swale that runs from north to south through the treatment plant property. This is the area that is currently bermed off. All stormwater in this low-lying area will collect and remain in that area. Stormwater from the industrial area adjacent to the biosolids facilities flows to an small drop inlet basin where the water is pumped back to the headworks. Stormwater from the front parking lot drains to a drop inlet that is pumped to the creek/drainage that flows along the west side of the facility. No industrial stormwater problems were observed. Wastewater Treatment Plant I observed a fairly strong odor when I drove into the plant. It was not clear where the odor was coming from, although I suspect that it was coming from the influent flow into the headworks. We walked through the treatment process. All process units were in operation except the advanced wastewater treatment facility. The day before my inspection, they had to bypass the secondary chlorine contact chamber in order to hook the new secondary clarifiers to the chlorine contact chamber. A temporary pipeline and pump were set up between the existing secondary clarifiers and the percolation pond. During the bypass, they had hypochlorite totes adjacent to the existing secondary clarifiers. The hypochlorite solution was dosed into the temporary pipe, mixed by the pump, and transported to the percolation pond. They monitored chlorine residual hourly and coliform part way through the test. Chlorine residuals ranged from 4-20 mg/l. I did not observe any facility violations. Disposal. During my inspection, disinfected secondary effluent was being discharged to the northernmost percolation pond. This pond was “ripped” during the summer to improve its permeability. The pond appears to being percolating the water very well, as the pond had only a few inches of water in the bottom. The middle pond had some rainwater in it and the southernmost pond was empty. The operators stated that they are in a far better position disposal-wise than they were last year. I did not inspect the laboratory or facility records during this inspection. The City recently hired two new wastewater treatment plant operators. They intend to hire a laboratory technician and a supervisor. Bill Pounders (Interim Plant supervisor) will remain with the City until they find a plant supervisor, or through the winter, whichever occurs first. Andrew Luke’s laboratory certification has expired so all BOD, TSS, coliform and nutrient samples are being sent to Alpha Labs in Ukiah. 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