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r } r � National pollution Discharge Ehmination System(NPDES)Permit AppliLatron . Flag City New West No 1003,6437 West Banner Street,Lodi,California Page 2 The bed is fluidized by a constant 50 gpm recirculation of water that dilutes incoming groundwater from the site After passing through the fluidized bed, the re-circulated water passes through a re-oxygenation tower The oxygen from air is augmented with an oxygen booster to increase the capacity of the bioreactor Solids such as calcium carbonate particles that may be formed as a result of oxygenation are removed by a bead filter Nutrients -- particularly nitrogen, phosphorus, and potassium —are metered to the bioreactor in a solution to enhance the bio-activity Two 1,000- pound granular activated carbon (GAC) units will be placed in series downstream of the bioreactor to polish the treated water and prevent any breakthrough of contaminants from the bioreactor Sample ports will be located before, between, and after the absorption vessels to monitor for breakthrough It is estimated that breakthrough would occur approximately every 14 years The ERI-4000 bioreactor is designed to treat a contaminant mass loading of up to 250,000 gpm-ppb (for example, 25 gpm with 10,000 ppb, or 2 5 gpm with 100,000 ppb) As far as hydraulic Ioadings are concerned, the bioreactor can handle groundwater flow rates of up to 35 gpm, so it is well suited for the proposed groundwater extraction rate of 25 gpm Generally, contaminant concentrations decrease substantially in the first several weeks of groundwater extraction During the initial startup phase, groundwater flow rates to the bioreactor will likely be less than 25 gpm and will be gradually increased as the contaminant concentrations decrease as to not overload the bioreactor • The water will be treated on site and discharged into the onsite storm drain3 ure Fi which drain (Figure ) discharges into the White Slough The discharge water will be permitted under California Regional Water Quality Control Board (CRWQCB) General Order 5-00-119 for discharge to surface waters All monitoring will be done in accordance with CRWQCB General Order 5- 00-119 All construction activities, including utility tie-in, trenching and paving, will be permitted by appropriate authorities and done in a workmanlike manner See Figure 2 for the designated disposal area, the onsite storm drain inlet 3 See Attachment B 4 See Figures 4 and 5 5 The anticipated average flow for the proposed system will be 25 gpm over a one year interval The maximum flow rate will not exceed 35 gpm The bioreactor can handle flow rates of up to 35 gpm 6 Water samples will be collected monthly from the system influent bioreactor discharge and mid between carbons, effluent, and outfall sampling points for analysis by a California- certified laboratory A summary of analyses and analytical methods to be used for samples collected at each sampling point is shown in Table 5