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Wt.-. s rL• RN CtiOLOG IC RFSOURCES , INC , <br /> • <br /> E Ratldr/9 May 1990 2 <br /> monitor wells are shown on Figure 2 of Attachment A We11 MW-1 is located near the former location <br /> of the underground storage tank, along the north side of the site Wells MW-2, MW-3 and MW-4 are <br /> located near the northeast, the northwest and the southeast corners of the API budding, respectively <br /> Soil samples collected from boring B-1,located adjacent to the location of the former underground fuel <br /> storage tank, contained total purgeable petroleum hydrocarbons (TPPII) at concentrations up to <br /> 5,200 ppm <br /> TPPH, characterized as gasoline,was detected in the groundwater samples from monitor wells MW-1 <br /> and MW-3 at 260,000 parts-per-billion (ppb) and 300 ppb, respectively Benzene was also detected in <br /> the groundwater samples from monitor wells MW-1 and MW-3, at concentrations of 32,000 ppb and 3 <br /> ppb,respectively TPPH and benzene were not detected in the groundwater samples from monitor wells <br /> yam- MW-2 or MW-4 The groundwater samples from monitor wells MW-1, MW-2 and MW-3, contained <br /> 1-2-dichloroethane(1,2-DCA),at concentrations of 2,100 ppb,20 ppb and 8 ppb, respectively Ethylene <br /> dibromide (EDB) was also detected in the groundwater sample from well MW-1, at a concentration of <br /> 600 ppb <br /> The groundwater flow beneath the site on 29 September 1989 was to the south at a gradient of about <br /> 25% <br /> SITE PLAN <br /> A site plan showing the former tank, the existing monitor wells and the proposed monitor wells is <br /> included as Figure 2 of Attachment A <br /> SITE SAFETY PLAN <br /> The site safety plan has been prepared and will be on-site, during all field activities Additionally, an <br /> underground locating service will be employed, prior to the start of work, to identify underground <br /> utilities and other possible obstacles <br /> SOIL BORINGS AND SAMPLING <br /> = The WGR standard operating procedure for collecting soil samples during drilling is included in <br /> Attachment B Boring B-5 is located approximately in the cenic,r of the API building Boring B-6 is <br /> c 066LIAPO WP <br /> w� <br /> I <br />