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1420 80" St. SW., Suite A <br /> CONESâ–șTOGA ROVERS Everett, WA 98203 <br /> e Telephone: (425) 212-5100 Fax: (425) 212-5199 <br /> & ASSOCIATES www.CRAworld.com <br /> MEMORANDUM <br /> TO: James Eisert REF.No.: 058324-2480 <br /> FROM: Jeffrey Cloud/bjw/39-NF DATE: April 20,2010 <br /> C.C.: Melissa Straten,Jesse Orth,Julie Lidstone E-Mail and Hard Copy if Requested <br /> RE: Data Quality Assessment and Validation of Reports J26671,J26676,J26700 &J26716 <br /> Semiannual Groundwater Sampling <br /> Maintenance Facility <br /> Tracy, CA <br /> March 2010 <br /> INTRODUCTION <br /> The following details a quality assessment and validation of the analytical data resulting from the March <br /> 2010,collection of groundwater samples in Tracy,CA. Samples were submitted to Test America <br /> Laboratories (TA),in Pleasanton, CA,and analyzed for the following: <br /> Parameter Methodology <br /> Volatile Organic Compounds (VOCs) SW846 8260B <br /> Diesel Range Organics (DRO) SW846 8015 <br /> Total and Dissolved Iron and Manganese SW846 6010B <br /> Anions EPA 300.0 <br /> Ammonia EPA 350.2 <br /> Sulfide EPA 376.1 <br /> Chemical Oxygen Demand (COD) EPA 410.4 <br /> Total Organic Carbon (TOC) and Dissolved Organic Carbon(DOC) SW846 9060 <br /> Alkalinity SM 2320B <br /> Biochemical Oxygen Demand (BOD) SM 5210B <br /> The analytical results are summarized in Table 1. The QC criteria used to assess the data were established <br /> by the methods and with the following guidance documents: <br /> i) "USEPA Contract Laboratory Program National Functional Guidelines for Organic Data Review", <br /> USEPA 540/R-99/008,October 1999 <br /> ii) "USEPA Contract Laboratory Program National Functional Guidelines for Inorganic Review", <br /> USEPA 540/R-94/013,February 1994 <br /> These guidelines are collectively referred to as "Guidelines" in this memorandum. <br /> EQUAL EMPLOYMENT OPPORTUNITY EMPLOYER <br />