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and the other variables are as defined for the water balance study. Because the object of <br /> the mass balance study is to evaluate the mass of TDS that may be leaving the ponds, by <br /> whatever mechanism, the relationship may be rewritten as follows : <br /> TDSOut _ [TDSJI, - ([TDS,]V, - [TDS,]V,) <br /> The TDS mass entering the ponds may therefore be calculated if the concentration of TDS <br /> in the water entering the ponds and the volume of water entering the ponds is known. The <br /> volume of inflow water will be measured as part of the water budget study. TDS measure- ti <br /> ments in the inflow water to the ponds will be measured by the City with composite samplers <br /> installed at the diversion sites. These measurements will take place daily, or at any time that <br /> diversion shifts from Industrial Raw Influent to Industrial Primary Effluent, or vice versa. R <br /> P <br /> The volume of water in the ponds will be measured at the beginning and end of the study l <br /> period as part of the water balance study. The remaining variables, TDS, and TDS, should <br /> be calculated by collecting a water sample from each of the ponds at the beginning and end <br /> of the study period and analyzing the sample for TDS. In order to evaluate the portion of <br /> the TDS that may be removed by biodegradation, if any, pond water samples will also be <br /> analyzed for EC, pH, and chloride. <br /> t <br /> It is proposed that the study period extend from August 3 to October 31, 1994. This will <br /> allow 3 months' data to be collected, and will span a large portion of the canning season. <br /> The following steps should be followed during the study: <br /> • Obtain a staff gauge with a base plate attached to prevent sinking in mud in <br /> the bottom of the ponds. <br /> • On August 3, record the current total of water on the totalizer (note the date <br /> and time) . Using a boat if possible, record the depth of each pond with the <br /> staff gauge in the center of the pond. Note the exact location at which the <br /> depth measurement is made. Collect water samples from pond inflow, each <br /> of the ponds, Sugar Cut Slough, and the existing monitoring wells. Analyze <br /> the samples for TDS, EC, pH, and chloride. At the same time, measure the <br /> water levels in the monitoring wells and in Sugar Cut Slough. <br /> • Collect composite water samples from the pond inflow and analyze the <br /> samples for TDS on a daily basis or whenever diversion changes from <br /> Industrial Raw Influent to Industrial Primary Effluent, or vice versa. Note the <br /> reading on the totalizer at this time (record the date and time). <br /> • On a monthly basis, obtain daily data from the City's weather station for <br /> precipitation and evaporation (temperature, wind speed, humidity, and solar <br /> radiation would be helpful but not critical) . <br /> • On Monday, October 31, record the reading on the totalizer. Record the <br /> depth of each pond with the staff gauge at the same location as on August 1. ! <br /> Collect water samples from pond inflow—each of the ponds, Sugar Cut Slough, <br /> and the monitoring wells. Analyze the samples for TDS, EC, pH, and <br /> chloride. <br /> SAC/SAC36357/041.WP5 14 8/94 <br />