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IV. Summary and Recommendations <br /> The results of the verification sampling investigation indicate the presence of soil and <br /> ground-water contamination on the Banner Island site. For purposes of considering site <br /> mitigation measures, the contamination which has impacted soil and ground water on the <br /> western portion of the parcel will be addressed below somewhat independently of the <br /> shallow soil contamination which has impacted soil on the eastern portion of the parcel. <br /> Following is a summary of the key findings for the eastern and western portions of the <br /> parcel based on present data. <br /> Eastern Portion of Parcel/East of Former Ship Building <br /> • TPH as motor oil is present at designated concentrations at a depth of 3 feet in <br /> the vicinity of borings 131 and B2. TPH concentrations decrease to very low <br /> levels at a depth of 5 feet. <br /> • Low concentrations of TPH as gasoline were detected in borings B1 and B2. No <br /> BTEX was detected at those locations. <br /> • Elevated total metal concentrations (lead, copper, and zinc) are present at all <br /> three boring sites, particularly at a depth of 3 feet. Metal concentrations <br /> generally decrease to typical and/or background concentrations at a depth of 5 <br /> feet. <br /> • The total lead concentration in boring B2 exceeds the TTLC for lead at a depth <br /> of 3 feet. <br /> © 1_UHDORFF & SCALMANINI <br /> �NSLJLT INC; L NGINEL. k' <br />