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Remediation Report - Fourth Quarter 2005 and First Quarter 2006 Former STOCKTON PLATING Facility 632 South El Dorado Street, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr Richard Leland of R and L Business Management of Stockton, Advanced GeoEnvironmental, Inc (AGE) has prepared this report for 632 South El Dorado Street, Stockton, California(the site) The report documents procedures and results of remediation ofthe ground water during the fourth quarter 2005 and the first quarter 2006 The location of the site is illustrated on Figure 1, locations of structures, soil borings and monitoring wells at the site are depicted on Figure 2 Site background information is provided in Appendix A 2.0. GROUND WATER EXTRACTION -TREATMENT REMEDIATION Ground water extractions were performed in accordance with procedures outlined in the AGE- prepared Final Remediation Plan, dated 23 April 2002 and the AGE-prepared Final Remediation Plan Addendum, dated 18 July 2003 and approved by the EHD on 29 July 2003 Field procedures for ground water sampling are described below 21 GROUND WATER TREATMENT OPERATION The ground water treatment system is designed to operate at a maximum flow rate above 10 gallons per minute(GPM) Ground water is extracted from the primary extraction well EW-1 at a maximum flow rate of approximately 8 0 GPM (increased flow rate due to a pump head replacement on 8 November 2005),in addition, ground water is also being extracted from the deep-screened casing of dual-completed vapor wells VW-1 and only during October/November 2005 from VW-3, at a maximum flow rate of 1 5 GPM The ground water treatment system operates on a batch basis Once the holding tank fills with sufficient water,approximately 80-100 gallons of extracted ground water are treated and discharged Since only 14,000 gallons of treated water(effluent)may be discharged daily to the City of Stockton sewer system, the effluent discharge was adjusted to a flow rate not to exceed 10 GPM 2 1 1 MONITORING AND SAMPLING ACTIVITIES In order to verify and quantify the mass of contamination from each extraction well and to comply with the requirements of the City of Stockton discharge permit, monthly monitoring and sampling of influent and effluent ground water was performed on 13 October, 16 November,and 13 December 2005, and 16 January, 16 February, and 15 March 2006 The samples were collected in laboratory- supplied 40-milliliter (ml) Environmental Protection Agency (EPA)-approved volatile organic Advanced GcoEnvironmental,Inc