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CO~Ll~D CORE LABORATORIES <br />Sample Delivery Group Narrative <br />December 24, 1998 <br />Customer: Greystone <br />Project: Costilla Co. <br />Core Laboratory Project Number: 983261 <br />Method 7470 Mercury Analysis - CVAA <br />Sample 983304-4 had the matrix spike and the matrix spike duplicate below acceptance <br />criteria for mercury. A post digestion spike was performed and was within acceptance <br />criteria. Matrix interferences are suspected of being a contributing factor. All other <br />associated quality control analyses were acceptable. <br />All other quality contr <br />-, ~ <br />L s:r~ <br />Wendell D. Fischer <br />Laboratory Supervisor <br />were acceptable. <br />/Patrick ]. McEntee <br />Laboratory Manager <br />,Mr~ ,oo a ~.~. m o <br />..o,n,.o..,r,,,.~.,,~a~_.~,~a.~~„~,.,..u..,,~~...,,,..~.._.~,,.. ,..„~, .~e.~,. .„,....,~..a,,..m..~,,.M,~,., .,m.,~m..,,a~o.,a.,.,~„> .~~.~. ~.,,a..M..- <br />