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R <br /> .++4EF9 CtSWEAf Wnl W! <br /> ROY F. WESTON, INC. <br />' STOCKTON LABORATORY <br /> METALS CASE NARRATIVE <br />' Client: San Joaquin County W.O.#: 03733-006-001-0 <br /> q tY <br /> RFW#: 9304S564 Date Rec'd: 04/16/93 <br /> 1 _ This narrative covers the analysis of five water samples for Lead. <br />' les were prepared and analyzed in accordance with method 239 2. <br /> 2 The same P P Yz <br />' 3. All analyses were performed within the required holding times <br /> 4 All Initial and Continuing Calibration Venfications (ICV/CCV's)were within control <br /> limits. <br />' 5 All Initial and Continuing Calibration Blanks(ICB/GCB's)were within control limns <br /> 6. All Preparation/Method Blanks were below Reporting Limits <br />' 7 All ICP Interference Check Samples (ICSAB) were within control limits <br /> 8 All Laboratory Control Samples (LCS) were within the 80-120% control lints <br /> (exceptions allowed for Ag and Sb). <br /> 9 All Serial Dilution percent differences were within the 90-110% control limit <br /> 10 All Matrix Spike recoveries were within the 75-125% control hmuts (exception <br /> allowed when sample concentration exceeds the spike added concentration by a <br /> factor of 4 or more). <br /> Matrix spike analyses not required for Ca, Mg, Na, and K <br /> 1 <br />