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1 <br /> ROY F. WESTON, INC. <br /> STOCKTON ANALYTICAL LABORATORY <br />' ANALYTICAL CASE NARRATIVE <br /> tClient: SAN JOAQUIN COUNTY <br /> RFW# : 911IS318 <br />' Test: SW8020 (BTEX) Pur able Aromatics <br /> t1. These samples were collected on November 9 , 1991 . <br />' 2 . These samples were analyzed on November 20, 1991 in accordance <br /> with SW 846 method 8020. <br />' 3 . All required holding times for these samples were met. <br /> 4 . The initial and continuing verification calibration standards <br /> associated with this set of samples were within Q.C. limits <br /> with the exception of Benzene (+20%) in the middle calibration <br /> standard. <br />' 5 . The method blank analyzed was within Q.C. limits. <br /> 6 . Of the 5 surrogates analyzed, 1 exceeded QC limits. The <br />' sample that dad not meet QC limits was COMPOSITE B, which was <br /> low (49%) . <br /> 7 . The blank spike recoveries were within QC limits. <br />' 8 . All retention times were within acceptable limits. <br /> I <br /> IGail R. Adams Date <br /> Unit Leader <br /> I <br />