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1 <br />' Quarter Monitoring Report <br /> January through March 2005 <br /> . 8200 N Highway 99, Stockton, CA <br /> Page 2 of 8 <br />' system interlocks, and conducting an acid-wash through the system to remove accumulated hard- <br /> water scaling <br />' Automated Environmental Services performed a contractors assessment and adjusted the system <br /> interlocks on February 8, 2005 On February 17, the system began to develop problems with <br />' backpressure in the carbon units The excessive back-pressure was due to scaling within the valves <br /> and piping The system was shut down on February 24, 2005, and the carbon unit C2 was <br /> temporarily bypassed, pending treatment with an acid wash The system was restarted on February <br />' 25 and operated with one carbon unit until March 8, when the system was shut down and carbon <br /> unit C2 and the air stripper were both flushed with an acid/water solution to remove accumulated <br /> scale The system was restarted on March 9 but again developed back-pressure issues due to <br />' scaling Carbon unit C2 was again temporarily bypassed on March 18 due to scaling and the <br /> system was eventually shut down on March 30 due to greatly reduced flow Various venders have <br /> been, contacted regarding the scaling issue The treatment system is currently idle while Ground <br />' Zero is awaiting authorization from the Regional Board to install an automated metering pump to <br /> infect Aqua Mag, a blended phosphate, into the influent stream to minimize scaling Aqua Mag <br /> would be added at a design rate of approximately 0 I gallons per day No samples were collected <br />' from the treatment system in March, because high back-pressure triggered automatic shut-down of <br /> the system on the scheduled sampling day, March 30, 2005 <br />� . Approximately 264,943 gallons of water was treated during the reporting period (December 30, <br /> 2004 through March 30, 2005) at an average rate of 3 5 gpm during system operation, or <br /> approximately 2 0 gpm overall A total of approximately 819,916 gallons of groundwater were <br /> treated since groundwater extraction begain in November 2003 During that period, approximately <br /> 82 pounds of petroleum hydrocarbons, including approximately 25 pounds of MTBE, were <br /> removed through groundwater extraction and treatment No carcinogenic polynuclear aromatic <br /> hydrocarbons (PAHs)have been detected in any influent or effluent samples collected at the site In <br /> addition, the concentrations of inorganic constituents analyzed as part of WDRs issued for the site <br /> are below regulatory levels <br />' Treatments stem flow data and maintenance notes through March 30 2005 <br /> y gh are summarized in <br />' Table 1 Analytical results of samples collected from the treatment system are summarized in Table <br /> 2 The estimated mass removal is summarized in Table 3 Treatment system monitoring logs and <br /> laboratory reports are included in Attachments A and B, respectively <br /> I <br /> 3.0 QUARTERLY SITE WORK <br /> r3.1 Groundwater Elevation Measurements <br /> A Ground Zero technician monitored water levels in all site wells, and collected groundwater <br /> samples from monitoring wells MW3 through MW16, the vapor extraction well VW1, and the <br /> • groundwater extraction wells EW1 (MWI) and EW2 on March 16 and 17, 2005 No data was <br /> G 1GROUNUZEITULEBURGIReports\QMR1200511QM2005 doe <br />