Laserfiche WebLink
C A M B R I A <br /> Groundwater data are summarized in Table 3 and are presented on Figure 2 The certified <br /> analytical reports for the water samples are presented in Appendix E <br /> CONCLUSIONS <br /> The goal of this investigation was to delineate the vertical and lateral extent of petroleum <br /> hydrocarbons previously detected in soil and groundwater in the vicinity of the northern <br /> dispenser island Boring SB-4 was drilled as close to the source area as possible to delineate <br /> the vertical extend of petroleum hydrocarbons in soil and groundwater Soil samples from 80 <br /> fbg and deeper did not contain TPHg or MTBE, and benzene was only detected in one sample <br /> deeper than 80 fbg at 0 00925 ppm The deepest soil sample (110 fbg) from boring SB-4 did <br /> not contain any TPHg, BTEX or MTBE These data suggest the vertical extent of <br /> petroleum hydrocarbons in soil is delineated in the vicinity of the northern dispenser island <br /> Borings SB-5 and SB-6 were drilled on either side of boring SB-4 to delineate the lateral <br /> extent of petroleum hydrocarbons detected in soil in the northern dispenser island area Soil <br /> analytical data from these two borings suggest petroleum hydrocarbon impacted soil is not <br /> laterally extensive These two borings delineate the lateral extent of petroleum <br /> hydrocarbons in soil from the northern dispenser island source area <br /> Boring SB-6 contained TPHg in shallow soil samples (10 fbg, 20 fbg, and 30 fbg) which may <br /> represent a minor surface release in the vicinity of this boring Deeper soil analytical data <br /> from this boring suggest petroleum hydrocarbons in this area do not extend deeper than 40 <br /> fbg Additionally, benzene and MTBE were not detected in these shallow soil samples <br /> Groundwater samples collected from boring S13-4 at 60 fbg, 72 fbg, 82 fbg, and 95 fbg suggest <br /> that vertical delineation of benzene and MTBE has been achieved with this investigation <br /> RECOMMENDATION <br /> Cambria recommends that well S-4 be added to the quarterly groundwater monitoring and <br /> sampling schedule established for this site Groundwater analytical data from this new well <br /> and from the pre-existing monitoring wells will be evaluated to determine if additional site <br /> investigation is warranted <br /> 0797 7 <br />