Laserfiche WebLink
Public Health Services <br /> Mr. Steven Sasson <br /> August 4, 1995 <br /> Page 2 <br /> ■ TPH-G (gasoline) by EPA Method 8015 (total volatile hydrocarbons) <br /> ■ Benzene, Toluene, Total Xylenes, and Ethylbenzene (BTXE) by EPA <br /> •- Method 8020 <br /> ■ Total Lead by EPA Method 7421 <br /> r Ethylene Dibromide by EPA Method 8240 <br /> Gasoline was found in one the samples at a concentration of 6.7 mg/kg. Benzene, Toluene, <br /> Ethylbenzene, and Total Xylenes were found at concentrations of 0.34, 0.050, 0.090, and 0.11 <br /> mg/kg respectively. Even though these concentrations are considered low enough to be <br /> protective of the environment at an average site', PHS/EHD believes that ground water In this <br /> area could be adversely affected by this small amount of gasoline. <br /> Remedlatlon Activities <br /> It Is probable that the amount of soil contamination is very limited. Reports of observations <br /> during the removal do not imply gross contamination. Additionally,the laboratory report indlcates <br /> that gasoline found In the soil sample was a nondegraded light fraction. This suggests to us that <br /> the contamination was probably created during tank removal and does not suggest a continuing <br /> leak situation. The remediation will therefore consist of further soil removal and background <br /> sampling. <br /> Procedures <br /> 1. A backhoe will remove backfill soil from the tank hole and store it near the hole. <br /> 2. A BBL engineer or geologist will monitor the excavation with an organic vapor monitor <br /> (OVM) to determine when contaminated soil is encountered. Contaminated soil will be <br /> •.. removed from the excavation and stored on a plastic membrane. <br /> 3. When OVM monitoring indicates that all contaminated soil has been removed, <br /> background soil samples will be collected for laboratory verification. The undisturbed <br /> samples will be collected with brass sleeves, chilled, and then transported, under chain- <br /> of-custody, to a State licensed laboratory for analysis. The soil samples will be analyzed <br /> for TPH-G (gasoline) by EPA Method 8015 (total volatile hydrocarbons) and Benzene, <br /> Toluene, Total Xylenes, and Ethylbenzene (BTXE) by EPA Method 8020. <br /> 4. This process will be repeated until the soil samples from the excavation contain <br /> nondetectable concentration of the chemicals of interest. <br /> 2 Water Quality Goals, Hazardous Criteria and Designated Level Examples for Chemical Constituents. Jon <br /> B. Marshack. October 3, 1988. <br /> raastizsz.r <br />