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Ms Margaret Lagono <br /> CAM B R I A February 26, 2001 <br />• Sediment Lithology The site is underlain by clay, silt, sand, silty sand, clayey silt, and sandy <br /> silt to the total explored depth of 45 fbg Sand lenses greater than <br /> one-foot in thickness were noted at approximately 34 and 43 fbg in <br /> boring CPT-3, at approximately 25 fbg in borings CPT-4 and CPT-5, and <br /> between approximately 25 and 34 fbg in boring CPT-6 <br /> Groundwater Depth Groundwater was encountered at approximately 23 0 fbg during drilling <br /> Chemical Analyses Soil and groundwater samples from the borings were analyzed as <br /> follows <br /> • TPHg, BTEX, and MTBE by EPA Method 8260B <br /> INVESTIGATION RESULTS <br /> Hydrocarbon Distribution in Soil No TPHg, benzene, or MTBE was detected in soil samples <br /> collected from borings CPT-1 through CPT-6 Analytical results are summarized in Table 1 and <br /> presented in Attachment A <br /> Hydrocarbon Distribution in Groundwater With the exception of sample CPT-3-24 0, no <br /> TPHg, MTBE, or benzene were detected in any of the groundwater samples collected MTBE by <br /> EPA Method 8260B was detected in sample CPT-3-24 0 at a concentration of 16 ppb Analytical <br /> results are summarized in Table 2 and presented in Attachment A <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Since MTBE was only detected in groundwater sample CPT-3-24 0 at 16 ppb, there appears to <br /> have been no significant vertical or horizontal migration of MTBE on or offsite Given the results <br /> of this investigation, Cambria does not recommend further assessment activity at this site <br /> However, we recommend continued quarterly groundwater monitoring to further define trends in <br /> groundwater flow direction and hydrocarbon and MTBE concentrations <br /> 3 <br />