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GeofFF Tecknus Inc Page 5 Sal]Groundwater Investigation Report George's Service Project No 4212 August 5 1997 I Bailer blanks for each sample, along with a field blank (prepared from water provided by the laboratory poured into a VOA vial on site), accompanied the samples to the laboratory and serve as checks against cross contamination A chain of custody document, listing all samples collected, accompanied the samples from field to laboratory, thereby providing a means to track their movement and insure their integrity All water purged from each monitoring well and not used as a sample, was placed in a 55 gallon DOT approved container, properly labeled and stored on site 2.2.2 Groundwater Sample Analyses One groundwater sample from each well was submitted to Sherwood Laboratories of Hilmar (State Certified Laboratory 41400) and analyzed for benzene, toluene, ethylbenzene and xylene (BTEX) and methyl tertiary butyl ether (MTBE) by EPA method 602, Gasoline range petroleum hydrocarbons (TPH-Gas) by EPA method 8015(m) and diesel range petroleum hydrocarbons analyses (TEPH-Diesel) by EPA method 3540/8015m The detection limits for these compounds are listed below A Chain of Custody was completed for all samples collected and tracked to ensure sample integrity Detection Limits BT TPH-Gasoline - iese Water gTL) U= 50 50 3.0 RIESULTS ®71I`�S'I ZGATI[iGN The analytical results and field observations are discussed below Summary analytical data is included in Appendix A, bonng logs are included in Appendix B A site map with soil boring and monitoring well locations and a geologic cross section are included as Figures 2 and 3, respectively 3.1 Analytical Results 3.1.1 Soil Sample Analysis In summary, soil contamination was detected in the five samples submitted from MW-102 Elevated levels of BTEX compounds and low levels of TPH-Gas were detected in samples collected from the 15 5, 20 5, 25 5, 45 5 and 50 5 foot intervals in MW-102 Petroleum hydrocarbons were not detected in the samples submitted for analysis from any of the shallow monitoring wells The geology as it relates to the analytical data is discussed in the conclusions section below Table 1 in Appendix A contains a full summary of the analytical data and the laboratory data sheets are included in Appendix C 3.1.2 Groundwater Sample Analysis After development of new monitoring wells, a groundwater monitoring was conducted on ' May 5. 1997 and samples were submitted for analysis for TEPH, TPH-Gasoline, BTEX and MTBE range contaminants The results of the groundwater analysis are included as Table 2 . in Appendix A The analytical data reports are included in Appendix C 1