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Marley Cooling Tower Company <br />Groundwater Treatment System <br />San Joaquin County <br />Inspection Report <br />September 24 Sampling Results: <br />/ February 7, 2003 <br />Marcus Pierce and Sudhakar Talanki (both Board staff) collected surface water samples at 3 locations in the <br />Stockton Diverting Canal: <br />7,500 feet upstream of the outfall at the Main Street bridge <br />At the outfall. <br />* 6,600 feet downstream of the outfall at the weir. <br />Water samples were submitted to a state certified laboratory for analysis of total chromium, hexavalent <br />chromium, arsenic, copper, and total dissolved solids TDS. Table 4 presents the results of laboratory analysis. <br />The results indicate that concentrations in the canal were below the NPDES permit receiving water limits for <br />all constituents that were sampled, and confirmed that the discharge at that time was in compliance with the <br />permit. <br />Table 4: Summary of Laboratory Results of Water Carnpipe CnnPeta.i by ct.,rr <br />Date <br />Sample <br />Total <br />Hexavalent <br />Arsenic <br />Copper <br />TDS <br />pH <br />(Time) <br />Location <br />Chromium <br />Chromium <br />(mg/liter) <br />(mg/liter) <br />(mg/liter) <br />-(mg/liter) <br />(mg/liter) <br />9/24/02 <br />Main St Bridge, <br />ND <br />ND (reporting <br />ND <br />ND <br />110 <br />8.34 <br />(12:10 <br />7,500 feet <br />(reporting <br />limit 1) <br />(reporting <br />(reporting <br />Pint) <br />upstream of the <br />limit 50) <br />limit 5) <br />limit 5) <br />outfall. <br />9/24/02 <br />At the outfall. <br />ND <br />ND (reporting <br />ND <br />ND <br />150 <br />8.03 <br />(12:30 <br />(reporting <br />limit 1) <br />(reporting <br />(reporting <br />m) <br />limit 50) <br />limit 5 <br />limit 5) <br />9/24/02 <br />6,600 feet <br />ND <br />ND (reporting <br />ND <br />ND <br />160 <br />8.28 <br />(1:00 pm) <br />downstream of <br />(reporting <br />limit 1) <br />(reporting <br />(reporting <br />the outfall at the <br />limit 50) <br />limit 5) <br />limit 5) <br />_ <br />weir. <br />ND = not detected at the at or above indicated reporting limit <br />Detailed Chronology: <br />Date: Time: Event/Notes: <br />9/16/02 or Between 10 * Discharge of caustic solution to Stockton Diverting Canal from groundwater <br />9/17/02 pm and 7 am treatment system malfunction. A pH sensor/meter system failed, causing <br />continuous discharge of caustic solution, resulting in a high pH in the treated <br />water discharge. Records from MCTC and conversations with MCTC staff <br />indicate that approximately 2,160 gallons of 50% by weight of sodium <br />hydroxide could have potentially been released. <br />9/17/02 7:07 am * MCTC staff note that the effluent pH meter signal was sending a constant and <br />false "low pH" signal of 2.79 to the pH adjustment pumps. This in turn had <br />8 <br />Approved: <br />