ARCHIVED REPORTS XR0003475 - Laserfiche WebLink

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CAMBRIA involving a plastic cup secured to a stick with duct tape,which may have introduced contamination into the sample In the meantime, Cambria extracted 15,000 gallons of water from the pump station holding into a baker tank This quantity of water was agreed upon by Cambria and the Department of Fish and Game personnel,based on a conservative estimate of the maximum amount of water that could have been released into the storm drain from the GWE system Cambria collected samples from the pump station holding before and after extracting the water Cambria also collected samples from the baker tank containing the extracted water from the pump station and from well RW-lA, which was the source of the released water All residuals generated will be properly disposed of based on the analytical results The overflow of water from the transfer tank occurred when the system shutdown mechanism failed to activate The transfer tank float switch should become vertical when the transfer tank is full,which sends an alarm signal to the control panel and shuts the system down The presence of a basket holding chlorine tablets to reduce bacterial growth in the transfer tank,however,physically interfered with the operation of the float switch and prevented the float switch from sensing that the tank was full and sending the appropriate alarm to the control panel In order to prevent this situation from • arising again,Cambria plans to move the chlorine basket away from the float switch and install one or more redundant system shutdown mechanisms The proposed mechanisms include a second float switch and a proving switch,which will confirm that water is flowing out of the carbon treatment units (into the sanitary sewer) whenever the transfer pump is operating In this way, Cambria intends to ensure that the GWE system shuts down properly and does not overflow again Cambria will notify the City of Stockton prior to resuming discharge, once these additional shutdown mechanisms are implemented We will also present the results of storm drain cleanout confirmation samples as soon as they are avaflable,and submit them with the next monthly discharge report Please call Joe Neely at(707) 933-2361 if you have any questions regarding this incident •