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20818 44th Avenue West, Suite 190 <br /> Lynnwood, WA 98036 <br /> CONESTOGA-ROVERS Telephone: (425) 563-6515 Fax: (425) 563-6599 <br /> & ASSOCIATES www.CRAworld.com <br /> MEMORANDUM <br /> To: James Eisert RET. No.: 058324-2480 <br /> � <br /> FROM: Jeffrey Cloud/bjw/116-NF t DATE: April 15, 2011 <br /> C.C.: Scott Hackman,Jesse Orth,Julie Lidstone EwNlaill,and a op if Requested <br /> -th-nt�=y <br /> RE: Data Quality Assessment and Validation of Reports J33917,J33991 &J34084 <br /> Annual Groundwater Sampling <br /> Maintenance Facility <br /> Tracy, CA <br /> March 2011 <br /> INTRODUCTION <br /> The following <br /> details a quality assessment and validation of the analytical data resulting from the March <br /> 1 <br /> 2011, 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 /> 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) SW846 9060 <br /> Dissolved Organic Carbon (DOC) SW846 9060 <br /> Alkalinity SM 2320B <br /> Biochemical Oxygen Demand (BOD) SM 5210E <br /> Permanent Dissolved Gases AM20GAX <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 /> WI�A! PAP�OYMLN: <br />