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e r _ '� �;' a - x _ � :,�' . ,..,;.. ..r,,,r:: ��� ;� .M�" _.�,.. ..e'.-?l ',� � - 5'l�" � _ �"'wu +•.,�"1�`t�,�'�:::�3 �-.w���.�:�.a <br /> SECTION 3 <br /> CONCL US,TON►S AND RECOMMENDATIONS <br /> The objectives of this investigation were to identify whether or not <br /> hydrocarbons have spread from the former UST location on the <br /> Safeway property. Consistent with measured groundwater direction <br /> over the past year, diesel in the groundwater tins spread in a <br /> southerly direction from the tank site. <br /> While tl:e upper 25 feet of soil south of the tank site are clean, a sandy <br /> layer below that depth has carried the hydrocarbons off of Safeway <br /> property under Navy Drive. ' <br /> Samples collected from the sandy material below 25 feet in depth <br /> indicated elevated concentrations of diesel south of the former tank <br /> locations.21 clearly show the preadles collected <br /> of the diesel fuel borings from a southerly <br /> andBy <br /> direction. <br /> Two of the five soil borings (B-20 and B-21.) were converted into four- <br /> inch PVC monitoring wells (MW-5 and MW-6• respectively). Three of <br /> the existing monitoring wells (MW-1, MW-2, and MW-3) were <br /> abandoned because of dropping water levels and unfavorable <br /> locations. <br /> Based on the past reports and the information gathered during this <br /> investigation, ERM-West recommends the following: <br /> • Develop and sample the three monitoring wells on a quarterly <br /> basis for TPH-Diesel. Quarterly sampling should begin in <br /> February 1991. <br /> • Monitoring well MW-6 must be sampled once for Coliform <br /> Bacteria because of its proximity to a Main sewer line. <br /> • Continue to monitor the direction of groundwater movement. <br /> 3-1 <br />