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' Quarter Monitoring Report January through March 2005 . 8200 N Highway 99, Stockton, CA Page 6 of 8 All of the drill cuttings produced were placed in four DOT approved 55-gallon drums and ' were temporarily stored on site Slaby Environmental of Borrego Springs, CA transported the drums to a licensed disposal facility ' 5.0 SUMMARY ' The groundwater treatment system was put into operation on November 5, 2003 pursuant to WDR General Order No R5-2003-004412 The system operated for 73 days during the reporting period, with brief periods of non-operation due to maintenance Late February and early March influent ' flow into the carbon units was restricted due to scaling within the slotted piping of the carbon units The system was treated with an acid wash in hopes of clearing the scaling, but scaling returned near the end of March The system was shut down and various venders were contacted regarding pre- treatment The prescribed treatment is a blended phosphate called Aqua Mag, which would be metered into the influent stream at approximately 0 2 gpd A copy of the Material Safety Data Sheet for Aqua Mag is included in Attachment I Ground Zero is waiting for authorization from the ' Regional Board to install the metering pump and begin pre-treatment of the influent stream with Aqua Mag Approximately 264,943 gallons of water were treated during the reporting period A total of approximately 819,916 gallons of groundwater has been treated between November 2003 and March 30, 2005 During that period, approximately 82 pounds of petroleum hydrocarbons, including approximately 25 pounds of MTBE, were removed through the treatment system The treatment system is currently idle while Ground Zero is waiting for authorization from the Regional Board to begin pre-treatment of the influent stream with Aqua Mag Groundwater in the shallow aquifer beneath the site generally flowed to the northeast when q g Y ' monitored on March 16, 2005, although a pumping depression was evident around the extraction well EW2 MTBE was detected in downgradient A Zone well MW12 on March 17, 2005 No MTBE was detected in wells MW10 or MW11, located west of well MW12, or in wells MW15 and MW16, which are located downgradient of well MW 12 ' MTBE was detected in the C Zone well MW13C Well MW13C is located east of the former water supply well No MTBE was detected in B Zone well MW14B, which is located within a ' few feet of the former water supply well I • G 1GROUNDZEITULESURGIReportslQMR1200511QM2005 doc r