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ENVIRONMENTAL - AGRICULTURAL <br /> Analytical Cheniists <br /> December 11, 2012 Lab ID : STK1251024 <br /> City of Lathrop Customer : 3-8507 <br /> Quality Control-Inorganic <br /> Constituent Method Date/1D Type Units Conc. OC Data i)QO Note <br /> Metals <br /> Arsenic 'liu.7 12/11/12:218186AC CCV ppm 1.000 100% 90-110 <br /> CCB ppm 0.0017 0.01 <br /> CCV ppm 1.000 99.2% 90-110 <br /> CCB Ppm 0.0040 0.01 <br /> 3050 12/07/12:213588AMB Blank mg/kg ND <0.5 <br /> LCS mg/kg 40.00 99.0% 85-115 <br /> MS mg/kg 40.00 -132% <%4 <br /> (STK1251024-001) MSD mg/kg 40.00 331% <'/4 <br /> MSRPD mg/kg 39.94 19.5% <_20 <br /> PDS IngAg 40.00 -218% 75-125 430 <br /> Definition <br /> PDS :PDS failed,matrix-Post Digestion Spike(PDS)not within Acceptance Range(AR)because of matrix interferences affecting this <br /> analyte. <br /> CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. <br /> CCB :Continuing Calibration Blank-Analyzed to verify the instrument baseline is within criteria. <br /> Blank :Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. <br /> LCS :Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. <br /> MS Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample <br /> matrix affects analyte recovery. <br /> MSD :Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyted.The recoveries <br /> are an indication of how that sample matrix affects analyte recovery. <br /> MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation <br /> and analysis. <br /> ND :Non-detect-Result was below the DQO listed for the analyte. <br /> <'/4 :High Sample Background-Spike concentration was less than one forth of the sample concentration. <br /> DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. <br /> Explanation <br /> 430 Post Digestion Spike(PDS)not within Acceptance Range(AR)because of matrix interferences affecting this analyte. <br /> ••4 <br /> �I IGIGiC'; Page 9 of 9 <br /> Corporate Offices&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory Field Office <br /> 853 Corporation Street 2500 Stagecoach Road 563 E.Lindo Avenue 3442 Empresa Drive,Suite D Visalia,California <br /> Santa Paula,CA 93060 Stockton,CA 95215 Chico,CA 95926 San Luis Obispo,CA 93401 TEL:(559)734-9473 <br /> TEL:(805)392-2000 TEL:(209)942-0182 TEL:(530)343-5818 TEL:(805)783-2940 Mobile:(559)737-2399 <br /> Env FAX:(805)525-4172/Ag FAX:(805)392-2063 FAX:(209)942-0423 FAX:(530)343-3807 FAX:(805)525-4172 FAX:(559)734-8435 <br /> CA NELAP Certification No.01110CA CA ELAP Certification No.1563 CA ELAP Certification No.2670 CA ELAP Certification No.2775 <br />