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Y 1 <br /> kft <br /> t <br /> Page 5 <br /> µ Hydrocarbons were not detected in groundwater samples from monitor wells MW-4 through <br /> MW-6, installed on June 19, 1991. TPH-g and BTEX were detected in a groundwater <br /> sample collected from monitor well MW-2 at levels of 1,000 ppb, 410 ppb,7.2 ppb, 15 ppb, <br /> and 44 ppb,respectively. <br /> Groundwater elevations measured on June 24, 1991, indica±e a groundwater flow direction <br /> to the northeast("fable 3,Figure 6). <br /> According to the terminology in the Tri-Regional Board Recommendations for Preliminary <br /> Evaluation and Investigation of Underground Tank Sites(August 10, 1991), the <br /> information included in the ESI Phase I subsurface investigation(April, 1991)and the <br /> Artesian Phase 11 subsurface investigation workplans and reports(May, 1991 and July, <br /> 199 1)are referred to as the Soil Contamination Workplan,Preliminary Report <br /> (groundwater),and part of the Problem Assessment Report(groundwater). <br />