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1420 80" St. SW., Suite A <br /> Everett,WA 98203 <br /> �* a CONESTOGA-ROVERS 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/37-NF DATE: April 15,2010 <br /> C.C.: Melissa Straten,Jesse Orth,Julie Lidstone E-Mail and Hard Co _f Rested <br /> RE: Data Quality Assessment and Validation of Report J24241 <br /> Semi-Annual Groundwater Sampling <br /> Maintenance Facility <br /> Tracy, CA <br /> November 2009 <br /> INTRODUCTION <br /> The following details a quality assessment and validation of the analytical data resulting from the <br /> November 2009,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 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 /> rQUAL_1-_M.?',_0YMr,%T OPPOR I Jiff PTY Pt JYDOYFR <br />