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Gealagka(Eechnics 2nc, Page 6 Soil Groundwater Investigation Report C&B Equipment Project No.: 336..2 December 22, 1997 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. _.f 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 #1400) and analyzed for benzene, toluene, ethylbenzene and xylene (BTEX) and Gasoline range petroleum hydrocarbons (TPH-Gas) by EPA method 8015(m). Samples were forwarded through Sherwood to West Laboratory (State Certified Laboratory #1346) for analysis of oxygenate compounds by method 8260. 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 emits: BTEX TPH-Gaso line Water lig =� etectionLimits: Water pg 3.0 RESULTS OF INVESTIGATION 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 and a geologic cross section are included as Figures 2 and 3, respectively. 3.1 Analytical Results A total of eleven soil samples, one pore water sample and nine groundwater samples were tested for the above mentioned compounds. The three soil samples from MW-101, the soil pore water sample and two groundwater samples tested positive for BTEX and or TPH-Gas. 3.1.1 Soil Analytical Results In summary, soil contamination was detected in the three samples submitted from MW-101. ' Elevated levels of BTEX compounds and TPH-Gas were detected in samples collected from the 5.5-6 foot interval in MW-101. Only low levels of BTEX compounds were detected in the 28-28.5 and the 39-39.5 foot intervals. 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. - It should be noted that the soil samples from MW-101 was improperly labeled as MW-102 _ on the chain of custody and hence the laboratory report also labeled them as MW-102. These k ._] samples were from MW-101. i i 'i