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