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a X1 <br /> C A M B R I A <br /> the current investigation are presented on Figure 2 The laboratory analytical report is presented <br /> in Appendix D <br /> HYDROCARBON DISTRIBUTION IN GROUNDWATER <br /> No TPHg, BTEX, or lead scavengers were detected in grab groundwater samples collected from <br /> the soil borings MTBE was detected in the groundwater sample collected from boring B-4 at a <br /> concentration of 7 1 ppb No other fuel oxygenates were detected in the groundwater samples <br /> The groundwater chemical analytical data (including data from the 1997 investigation) are <br /> summarized in Table 3 TPHg, benzene and MTBE results from the current investigation are <br /> presented on Figure 2 The laboratory analytical report is included in Appendix D <br /> CONCLUSIONS <br /> Borings B-3 and B-4 were installed to further assess the presence of a perched water zone <br /> previously encountered at approximately 14 to 17 fbg in boring B-1 (1997) Borings B-3 and B-4 <br /> were continuously sampled for lithologic observations In both locations, a sandy soil was <br /> t encountered, but no water or saturated conditions were observed Soil samples retrieved from <br /> these borings did not indicate any impact from petroleum constituents Based on these findings, <br /> it appears that the perched water previously encountered was seasonal and limited in its extent <br /> Further, groundwater samples collected from these borings and during quarterly sampling of the <br /> onsite monitoring wells do not indicate significant impact beneath this site <br /> RECOMMENDATIONS <br /> Given the commercial use of the surrounding properties, the vertical separation of the previously <br /> encountered perched zone from the aquifer, and the historical data from ongoing groundwater <br /> monitoring, Cambria recommends no further action at this site We respectfully request case <br /> closure <br /> I <br /> 0832 5 <br />