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SOIL GAS RESULTS i :OMPANY: U.S. Technical Consultants PROJECT NAME: Stockton, CA CONTACT. Mr. Rory Hall PROJECT NO.: OTI-900501 ADDRESS: 1414 W. Broadway Rd., #150 SAMPLE DATES: 5/9-10/90 Tempe, Arizona 85282 MATRIX TYPE: Air (sail gases) SAMPLE TVPH Benzene Toluene Xylenes ID n Iml n Iml In/ml) n Iml C__2QMMEfd1 S SG-1 26 6.2 11,0 4.8 Hard Clays, Low Air Flow, Looks Like Older Gas SG-2 1.5 <0.07 1.2 5.8 Low Alr Flow 5G-3-1 NO NO ND . NO Purged for 30 Seconds 4 SG-3-2 6.0 NO ND ND Purged for 2 Min. SG-3-3 0.2 NO ND ND Sampled @ 13 feet. SG-4 <0.2 NO NO ND Moderate Air Flow During Sampling SG-5 90,000 2,200 2,800 1,700 Very High, Fresher Gas Than SG-01 SG-6 6.5 NO 7.1 2.0 Resistanse @ 1 ft., Poor Chromatography SG-7 6.6 0.2 0.7 1.5 Poor Chrom., highly degradated SG-8 6.3 0.3 0.7 2.0 Same as SG-6 and 7 -- SG-9 6.0 0.3 0.7 NO Same as Above SG-10 <0.2 NO NO ND Unable to Integrate Because of Poor Peaks SGA 1 5.8 1.1 2.5 4.3 Similar to 50-6 to 9, degradated SG-12.1 4.8 1.2 NO 4.2 Sample @ 5' SG-12-2 <0.2 NO ND ND Sample @ 13', Unable to Integrate, low SG-13 7.5 1.1 1.7 3.3 OK SG-14 ND NO ND ND Very Clean SG-15 4.2 <0.1 <0.1 0.2 Very Small levels of BTX SG-16-1 VOID Very High Light End, Too High to Quantitate SG-i6-2 6,000 >100 ND NO High Lights, No Odor, 250 ul Ink WIII Re-sample SG-16-3 1.3 ND NO NO New Probe, nothing, Using These Results SG-17 1.2 NO ND ND Very Small, Poor Flow HS-17 190 8.0 20 168 Head Space on Soil From Probe Tip GG-18-1 5.3 0.9 1.0 0.5 Very Low, Expecting More, Re-sampling SG-18-2 4.2 0.7 0.6 0.1 Sampled @ 6', Also Very Low SG-19 VOID -- ---- --- - -Too high to-Quantitate;-Re-sampling ---- -. - ------------ - - - SG-19-Dup 150 20 20 3.6 Good Sun, Mostly Llghis SG-20 1.3 ND ND NO OK, No BTX SG-21 1.7 0.5 0.4 0.4 OK _ SG-22 <1.0 <0.i <0.1 ND Low, Poor Peaks, Can't Integrate ND = Less Than the.Delectable Limits of 0.07 nglml. - <1.0 = Detectable but Below Quantitation Limits or Unable to Integrate Because of Poor Peak Shape. NOTE: All Results are relative to this site and do not represent actual concentrations In the sail.