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ROY F. WESTON, INC. <br /> STOCKTON LABORATORY <br /> METALS CASE NARRATIVE <br /> Client: Stockton Plating W.O.#: 06526-001-001-0001-00 <br /> RFW#: 95045536 Date Recd: 04/20/95 <br /> 1. This narrative covers the analysis of one soil sample for Cadmium, Chromium, <br /> Copper, Lead, Nickel, and Zinc. <br /> 2. The sample as prepared and analyzed in accordance with method 6010. <br /> 3. All analyses were performed within the required holding times. <br /> 4. All Initial and Continuing Calibration Verifications(ICV/CCV's)were within control <br /> limits. <br /> 5. All Initial and Continuing Calibration Blanks(ICB/CCB's)were within control limits. <br /> 6. All Prepara 'on/Method Blanks were below Reporting Limits. <br /> 7. All ICP Interference Check Samples (ICSAB) were within control limits. <br /> 8. All Laborat ry Control Samples (LCS) were within the 80-120% control limits <br /> (exceptions Wowed for Ag and Sb). <br /> 9. All Serial D' ution percent differences were within the 10% control limit except for <br /> Chromium, opper, and Nickel. <br /> 10. All Matrix Spike recoveries were within the 75-125% control limits (exception <br /> allowed wh n sample concentration exceeds the spike added concentration by a <br /> factor of 4 r more). <br /> � J <br />