Laserfiche WebLink
GEDMATRIX <br /> • carbon range),diesel(I PHd;C I o-C24carbon range),and crude oil(TPHc;Cg-C36 carbon range)by <br /> U.S.Environmental Protection Agency(EPA)Method 8015 Modified;for benzene,toluene, <br /> ethylbenzene,and xylenes(BTEX),and methyl tertiary butyl ether(MTBE)by EPA Method 8260B; <br /> and for polynuclear aromatic hydrocarbons(PAHs)by EPA Method 8270 SIM. The soil sample <br /> collected from boring GMX-12 was additionally submitted for a forensic evaluation. The <br /> groundwater sample was submitted for analysis for BTEX and MTBE by EPA Method 8260B;and <br /> PAHs by EPA Method 8270 SIM. <br /> Following collection of the soil and groundwater samples,the boreholes were backfilled with cement <br /> grout. Per a request from Mike Infuma,an inspector with the SJCPHS,the boreholes were grouted to <br /> approximately 3 feet bgs to accommodate future grading activities on the site. <br /> 4.0 ANALYTICAL RESULTS <br /> TPHc was detected in three of the seven soil samples analyzed(GMX-9, 10,and 12)at <br /> concentrations up to 14,000 milligrams per kilogram(mg/kg). TPHd and TPHg were detected in the <br /> same three soil samples(GMX-9, 10,and 12)at concentrations up to 5600 and 200 mg/kg, <br /> respectively. Based on review of the chromatograms,it appears that these samples are impacted by <br /> degraded crude oil and the TPHg and TPHd results are simply portions of the crude oil boiling range. <br /> Benzene,toluene,ethylbenzene,xylenes,and MTBE were not detected in any of the soil samples. <br /> Low concentrations of several PAHs were detected in the soil samples from GMX-9 and GMX-10. <br /> Soil analytical results are summarized in Table 1 and are presented on Figure 2. <br /> The forensic evaluation of the soil sample collected from boring GMX-12 indicated that the <br /> petroleum hydrocarbons present in the sample likely represent a degraded crude oil. A more detailed <br /> discussion is presented in the analytical laboratory report(Appendix B). <br /> No benzene,toluene,ethylbenzene,xylenes,or MTBE were detected in the groundwater sample <br /> collected from boring GMX-12. Acenaphthene and fluorene were the only PAHs detected in the <br /> groundwater sample;these were detected at concentrations of 0.1 and 0.3 micrograms per liter(4g/1), <br /> respectively. <br /> The analytical laboratory report for the soil and groundwater samples is presented in Appendix B. <br /> • <br /> \\SF3\DEPTDATA\DOC_SAFE\5000S15650\BURNS\BURNS SOILGW RPT.DOC 3 <br />