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<br />ECS <br />ENVIRONMENTAL <br />CHEMISTRY <br />SERVICES, INC. <br />Mr. Daren Johnston <br />ERM-Rocky Mountain, Inc. <br />5950 S. Willow Drive, Suite 200 <br />Greenwood Village, CO 80111-5144 <br />RE: ECS Project #ERM210 <br />Dear Daren: <br />_ May 20, 1996 <br />' ~~ <br />ii';. ~ MAY 2 1196 <br />Enclosed are the BTEX and TEPH results for the ERM Project #961019.0 soil and <br />water samples we received on May 13. <br />The samples were analyzed for BTEX by purge and trap concentration (EPA <br />Method 5030) combined with gas chromatography (GC) as described in EPA <br />Method 8020. The surrogate standard was added to all samples to monitor <br />purging efficiency. The sample results and the quality control results can be <br />found in Tables 1 and 2. <br />The samples were analyzed for total extractable petroleum hydrocarbons (TEPH) <br />by the Colorado 8015 Modified Method which measures the diesel range <br />hydrocarbons from C„ - CZB. The soil samples were extracted with hexane <br />using vortex mixing, sonic agitation, and centrifuging. The water samples were <br />extracted with hexane using reparatory funnel technique. The extracts were <br />analyzed by gas chromatography with a flame ionization detector. The surrogate <br />standard was added to monitor extraction efficiency. The sample results are <br />reported in Tables 3 and 4 with the quality control results. <br />Please call if you have any questions. <br />Sincerely, <br />John Graves <br />Technical Director <br />7108 S. Alton Way, Bldg E • Englewood, CO 801 12 • OFFICE: (303) 850-7606 • FAX: (303) 850-7609 <br />