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1420 80" St. SW., suite A <br /> Everett, WA 98203 <br /> a CCNVESTOGA-ROVER'S Telephone: (425)212-5100 Fax: (425) 212-5199 <br /> &ASSOCIATES www.CRAworld.com <br /> MEMORANDUM <br /> To: James Eisert REF.No.: 058324-2480 <br /> <" <br /> FROM: Jeffrey Cloud/bjw/56-NF DATE: July 15, 2010 <br /> t� <br /> C.C.: Melissa Straten,Jesse Orth,Julie Lidstone E-Mail and Hard Cif Reauested <br /> RE: Data Quality Assessment and Validation of Report J28926 <br /> 2nd Quarter Groundwater Sampling <br /> Maintenance Facility <br /> Tracy,CA <br /> June 2010 <br /> INTRODUCTION <br /> The following details a quality assessment and validation of the analytical data resulting from the June <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 /> Diesel Range Organics (DRO) SW846 8015B <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 /> SAMPLE QUANTITATION <br /> The laboratory did not report any detected concentrations below the laboratory's practical quantitation limit <br /> (PQL)/report limit(RL). <br /> EQUAL EMPLOYMENT OPPORTUNITY EMPLOYER <br />