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i�tnal7crhnccs Inc Page 5 Soil roundwater Investigation Report George s Service Project No 4151 November 30,1998 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 Iabeled and stored on site 2.2.2 Groundwntea Sample Analyses One groundwater sample from each well was submitted to Sherwood Laboratories of Hilmar (State Certified Laboratory#1400) and analyzed for o benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 602 o methyl tertiary butyl ether (MTBE) by EPA method 602 o gasoline range petroleum hydrocarbons (TPH-G) by EPA method 8015(m) iThe 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 BTE TPH-Ciasoline ater µg 3.0 RESULTS OF 1NVESTffGA' ION The analytical results and field observations are discussed below Summary analytical data is included in Appendix A, boring logs are included in Appendix B A site map with soil boring and monitoring well locations is included as Figure 2 A map showing the TPH-G concentrations in the soil is included as Figure 3 Two cross sections are included as Figures 4 & 5 3.1 Analytical Results 3.1.1 Soil Sample Analysis In summary, soil contamination was only detected in the one of the three samples submitted from MW-105 Moderate levels of BTEX compounds and TPH-G were detected in sample collected from the 6-foot interval in MW-105 Petroleum hydrocarbons were not detected in either of the two samples collected from MW-107 All four-soil samples collected from MW-202 were non-detect for BTEX, MTBE and TPH-G All borings were non-detect for TEPH compounds (diesel range petroleum hydrocarbons) Several soil samples were also tested for selected geo-physical parameters These are summarized in Table 2 and the lab data attached in Appendix C This data will be used in future risk evaluation work, however a quick summary is given below 0 Clay units have the highest porosity, the lowest permeability, and the lowest dry bulk density o Sand units have fairly high porosity, the highest permeability, and fairly low dry bulk density o Gravel units have the lowest porosity, fairly high permeability, and the highest dry bulk density