Laserfiche WebLink
Additionally, eight discrete soil samples were collected from the locations of the composite <br /> samples <br /> All collected soil samples were placed immediately on ice pending shipment under chain of <br /> ' custody. The 4.1 composite samples were transported to Argon Mobile Labs for analysis of <br /> BTEX, TPHg, and TPHd utilizing EPA methods 8020 and 8015, respectively. The discrete <br /> ' samples were transported to Sequoia Analytical (DHS #1210) for analysis of inorganic <br /> compounds phosphorous (P), potassium (K), Nitrate (NO3), and Heterotroptic Plate Count <br /> Results for BTEX, TPHg, and TPHd are summarized in Table 4 Laboratory data sheets and <br /> chain of custody documentation are included as Appendix III <br /> 5.0 CONCLUSIONS <br /> 5.1 Soil Contamination <br /> Gasoline hydrocarbons were detected in borings SB2 and SB3 (Table 1) at concentrations near <br /> ' laboratory detection limits Detected hydrocarbons, most notably TPHg (6 8 and 6 5 parts per <br /> million) were detected near the groundwater interface at 16 feet below grade No <br /> hydrocarbons were detected in the soil samples from 10 feet below grade in these borings No <br /> petroleum hydrocarbon analytes were detected in the soil samples collected from MW1, MW2, <br /> or MW3. <br /> These data indicate minor residual soil contamination exists within the capillary fringe along <br /> ' the northwestern boundary of the former excavation. The estimated extent of residual <br /> contamination is depicted on Plate 4. <br /> 5.2 Groundwater Contamination <br /> ' No petroleum hydrocarbon analytes were detected in the water samples collected from wells <br /> MW 1 through MW3 <br /> 15.3 <br /> Stockpiled Soil <br /> No petroleum hydrocarbon analytes were detected in soil samples collected from the stockpiled <br /> ' soil. The Heterotroptic Plate Count, ranging from < 10,000 to 1,700,000 cfu/mg, indicates a <br /> relatively modest but viable bacteria colony Nitrate, ranging from 4 5 to 22 mg/kg, could <br /> support bacterial growth to achieve remediation of soils, should residual hydrocarbons exist. <br /> 4' <br /> 15010MR-M95 5 CanoliteEnvlronmental <br />