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Mr. Ross Atkinson <br /> March 30, 2001 <br /> Page 8 <br /> ■ Analytical methods -required to assess appropriateness and acceptability of <br /> analytical method used; <br /> ■ Detection limits-required to assess the lower limit of parameter identification; <br /> • Holding times,and dates of extraction,analysis and preservation - required to <br /> assess whether the samples were extracted and analyzed within the holding <br /> time required;and <br /> ■ Laboratory QA/QC procedures -required to assess analytical accuracy and <br /> sample integrity. Spikes, duplicates,method blanks,and surrogates for each <br /> analytical batch are to be analyzed by the laboratory at appropriate frequencies. <br /> Analytical data may be qualified based on data verification reviews. Qualifiers will be <br /> consistent with the applicable U.S. EPA functional guidelines and will be used to provide <br /> data users with an estimate of the level of certainty associated with the result"flagged". <br /> Reporting <br /> Following receipt of the analytical results,a report will be prepared documenting the <br /> sample collection activities and presenting the analytical results. This information, along <br /> with the analytical results of the stockpile sampling,will then be evaluated and compared <br /> to the appropriate regulatory criteria to evaluate if the waste material on-site has <br /> impacted groundwater. <br /> We look forward to the RWQCB's approval of this work. If you have comments or need <br /> additional information, please contact Mr.Peter Moore of Mor ierLifetile at(909) 796-8324, <br /> extension 207, or at his voice mail number at (800) 274-6505 extension 1712. <br /> Very truly yours, <br /> BROWN AND CALDWELL <br /> �tl Ada.L.- <br /> Linda Conlan, RG <br /> Principal Geologist <br /> Sr. Project Manager <br /> Attachments <br /> cc: Peter Moore, MonierLifetile, LLC <br /> Kama Hamgfeld, Law Offices of Herum Crabtree <br /> P.\.p\lobs\20587\102253 Gmu du to%"Rdoc <br />