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NORTH <br /> CREEK <br /> —=ANALYTICAL <br />{ 18939 120th Avenue N.E., Suite 101 •Bothell,WA 98011-2569 <br /> February 19, 1992 Phone(206) 481-9200• FAX(206)485-2992 <br /> r" <br /> Mr. Rob Gwilym <br /> Steffen, Robertson and Kristen, Inc. <br /> 15311 N.E. 90th Street <br /> Redmond, WA 98052 <br /> Subject: Diamond Lumber, Project # 32504.24 <br /> Dear Mr. Gwilym: <br /> In response to our telephone conversation last week„ IRwould like to provide some <br /> additional-=information., ;_.North_-Creek.-•-Anal�,ftical is�accreditated -by-the"California- <br /> Department of Health Services for a variety of analytical procedures. A copy of our <br /> accreditation certificate is enclosed. <br /> Our laboratory does not hold accreditation for the analysis of lead at this time. For <br /> the SRK projects in Weed, CA, we received last fall we subcontracted the lead <br /> analyses to an affiliated California accreditated laboratory. We errored when we did <br /> not subcontract the samples for lead for the Lodi project. Because these samples are <br /> still within holding time for that procedure, I am willing to send these samples out for <br /> re-analysis at no charge to SRK. Please instruct us as to appropriate further action. <br /> Our laboratory is capable of attaining detection limits equal to 0.005 mg/kg in soil for <br /> BTEX by EPA 8020. This is accomplished.by using a.direct sparge technique instead <br /> of a methanolic dilution/purge and trap procedure. We perform the lower D.L. direct <br /> sparge technique on an "as requested" basis. If future chain of custodies request a <br /> specific D.L, we will be pleased to provide it. <br /> am confident we came overcome the issues listed above. We look forward to the <br /> opportunity to continue to serve your analytical needs. <br />� = F very truly ydui•s; <br /> k <br /> RTH CREEK ANALYTICAL, Inc. <br />{4 <br /> ?tC <br /> ocanour <br /> Laboratory Director <br /> r <br />