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a ' <br /> Ms Vicky McCartney <br /> May 18, 2006 <br /> Page 2 of 2 <br /> DOT-approved 55-gallon drum The drum is currently being stored onsite Purge logs are included <br /> in Attachment A <br /> Groundwater Analytical Results <br /> No contaminants were detected in the samples from monitoring wells MW2 and MW3 /TPHg and <br /> benzene were detected in the sample from well MWI at concentrations of 89 parts per billion (ppb)and <br /> 1 4 ppb, respectively Groundwater analytical results are summarized in Table 2 A copy of the <br /> laboratory report including chain of custody documentation is included in Attachment B <br /> Summary <br /> The three monitoring wells at the site were monitored and sampled on May 9, 2006 Results can be <br /> summarized as follows <br /> • Groundwater levels in the site monitoring wells rose since last monitored in August 2005 The <br /> average groundwater gradient across the site was 0 009 ft/ft (approximately 47 ft/mile) <br /> Groundwater flowed in a northeasterly direction, which is consistent with previous <br /> measurements ` <br /> • TPHg and benzene were present at low levels in the water sample from well MW 1 No <br /> detectable concentrations of any analytes were reported in the samples from monitoring wells <br /> MW2 and MW3 r <br /> Conclusions <br /> The current data support the conclusion that contaminant concentrations in groundwater at the site <br /> are continuing to decrease Graphs depicting benzene concentrations over time in site wells are <br /> included in Attachment C The next round of groundwater sampling is scheduled to occur in <br /> August, 2006, water levels will be measured in all wells and MW3 will be sampled Please contact <br /> Ground Zero at your earliest convenience if you have any questions regarding this report / <br /> Respectfully, • <br /> tWW <br /> Ground Zero Analysis, In �� Cfp <br /> Ok <br /> a PrP <br /> Gregory P Stahl, PG 5023 * i 5 <br /> CA Certified Hydrogeologist No 264 <br /> c <br /> A,tta hments OF C <br /> cc Ms Jan Thompson, Wilbur-Ellis <br /> Mr Eric Jenks, Wilbur-Ellis <br /> Mr Doug Reynolds, H&H Engineering <br /> • Mr James L L Barton, RWQCB <br /> G 1GROUNDZEIW E\SAR1200611 SAR06 doe <br />