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1 2 2 Prel�minary Investigation and Evaluation <br /> On June 16, 1999, Ramage Environmental ental submitted Work Plan, Environmental Site <br /> Investigation On July 20, 1999, PHS/EHD approved the work plan <br /> i <br /> On November 18, 1999, Ramage Environmental supervised the drilling of one soil boring (SB-1) <br /> to a depth of 83 feet, at the north end of the middle former UST (Figures 2) Laboratory analysis <br /> Of soil samples collected during drilling indicated that except for trace concentrations of toluene, <br /> ethylbenzene and xylenes, impacted soil at this location is concentrated above 25 feet bgs <br /> Groundwater was encountered in SB-1 at a depth of 78 5 feet Using a temporary well, <br /> groundwater was purged and sampled from SB-1 Results of the laboratory analysis indicated <br /> that groundwater was impacted with 130 micrograms per liter(µg/1) of TPH-as-gasoline, 1 9 µg11 of <br /> toluene, 1 4 µg11 of ethylbenzene, and 9 5 µg/l of xylenes Benzene, oxygenate compounds, and <br /> 1,2-dichloroethane (1,2-DCA) were not detected These results are summarized in Table 2 <br /> On November 18, 1999, Ramage Environmental sampled groundwater from the on-site domestic <br /> well The laboratory results, summarized in Table 2, indicated that the domestic well had not <br /> been impacted by gasoline constituent compounds <br /> On January 6, 2000, Ramage Environmental documented the results of the drilling and sampling <br /> in Environmental Site Investigation Report Due to the proximity of the domestic well to the <br /> impacted groundwater, Ramage Environmental recommended that three on-site monitoring wells <br />' be installed and sampled on a quarterly basis for at least one year, and that a sensitive receptor <br /> survey be conducted On January 27, 2000, PHS/EHD approved these recommendations and <br /> requested that this subject work plan be submitted <br /> 1 2 3 Monitoring <br /> Well Installations <br />' On March 30, 2001, Ramage Environmental published Monitonng Wel!Installation Report, which <br /> documented the permitting, installing, surveying, monitoring and sampling of three on-site <br /> monitoring wells (MW-1, MW-2 and MW-3), and the sampling of the on-site domestic water supply <br /> well The well locations are shown on Figure 2 <br /> 1 <br /> 6 <br /> 1 <br /> r <br />