Laserfiche WebLink
with groundwater elevations measured at the former ARCO Service Station and The <br /> Transirussion Shop <br /> 5.4 Distribution of Hydrocarbons in Groundwater <br />' TPHG was detected in the groundwater sample collected from monitoring well MW-1 at a <br /> concentration of 18,000 micrograms per liter (pg/L) BTEX was also detected in the <br /> groundwater sample from monitoring well MW-1 at concentrations of 4,400 Pg/L, <br /> 280 pg/L, 890 pg/L, and 1,200 pg/L, respectively While MTBE was not detected in well <br /> MW-I, the method reporting hrrut for MTBE was raised (300 pg/L) due to high analyte <br /> concentration requiring dilution <br /> TPHG was detected in the groundwater sample collected from monitoring well MW-2 at a <br />' concentration of 220 pg/L BTEX was also detected in the groundwater sample from <br /> monitoring well MW-2 at concentrations of 33 pg/L, 1 1 pg/L, 2 5 pg/L, and 2 3 pg/L, <br /> respectively MTBE was not detected in well MW-2 above the method reporting limit of <br />' 3 }ig/L The results of groundwater analyses are summarized in Table 4 Copies of the <br /> laboratory analysis reports are presented in Appendix C <br />' Based on the analytical data collected to date, groundwater beneath the site is impacted <br /> with petroleum hydrocarbons The lateral and vertical extent of impact to groundwater <br /> beneath the site has not been entirely defined <br /> 5.5 Remediation Feasibility <br /> Based on a soil vapor extraction (SVE) test conducted at the former ARCO Service <br /> Station, vapor extraction is a feasible method to remove hydrocarbons from soil <br />' (RESNA, December I8, 1992) RESNA estimated that an effective radius of influence in <br /> excess of 50 feet can be expected, using an extraction flow rate of 25 cubic feet per <br /> minute ARCO has recently begun operation of an SVE system In addition, the <br /> Texaco Service Station is actively remediating hydrocarbons by SVE Therefore, because <br /> the geology is similar to the former ARCO Service Station and Texaco Service Station, it <br />' would appear that SVE is a viable remediation alternative for the subject site <br /> SACNN\PJ2\2605\26051010 1 BS 97\r-11U 2 Emcon <br /> 22605-101 001 5-3 Rev 0,814197 <br /> I <br />