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p a� <br /> � 7 cr <br /> d <br /> a s� <br /> 14 October 2010 5 t' �d b 6 Ud <br /> AGE-NC Project No. 98-0533 Oa7 <br /> Page 2 of 2 0 <br /> After collection of soil vapor samples and reporting and evaluatbrfof,analytical data, the <br /> vapor points will remain for additional sampling or monitoring. <br /> AGE proposes to utilize 70% isopropyl alcohol (rubbing alcohol)as a leak detection tracer <br /> compound to ensure that a reliable soil-vapor sample is collected from each soil boring with <br /> no ambient air breakthrough down the probe rods. AGE will apply an appropriate amount <br /> of rubbing alcohol (approximately 8 ounces) to adequately wet a cotton towel; the wetted <br /> towel will be completely wrapped around the base of the probe rod where it contacts the <br /> surface and the bentonite seal. Thereafter, a soil-vapor sample will be collected. Isopropyl <br /> alcohol analysis will verify the validity of each sample. <br /> Soil vapor samples will be analyzed by a CDPH-certified laboratory for the following <br /> constituents: <br /> • Total petroleum hydrocarbons quantified as aviation fuel (TPH-ag) in accordance <br /> with EPA Method T03 or EPA 8260; and <br /> • Benzene,toluene,ethylbenzene and xylenes(BTEX),and methyl tertiary-butyl ether <br /> (MTBE), and a tracer compound (isopropyl alcohol) in accordance EPA Method <br /> TO15 or EPA 8260. <br /> Laboratory reports for soil vapor analysis, testing methods, laboratory quality <br /> assurance/quality control (QA/QC)report, and sample chain of custody documentation will <br /> be presented in a report of findings and recommendations. <br /> Please contact our office at (209) 467-1006 if you have any questions or comments. <br /> Sincerely, <br /> ��orn:cEo� <br /> Advanced GeoEnvironment m R. °cs� <br /> No. 7473 <br /> William R. Little <br /> Senior Project Geologist sfq P�.P <br /> California Professional Geologis ' rnFT , <br /> cc: Mr. Robert Kupka <br />