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OWL(Wo s, E OMMENDATIONS AND PROJECT STATUS <br /> itis acditit�naI s ,. �o sfiga3 f,�r � lm d the geology and r l ert <br /> pita, #1 & _ .U' <br /> mon "n well network, d Thr evaluated t�� lar !� <br /> vertical extent cif S , df� i OUI, clwwa'ter irrrrpact d by petroleum hy►droc�rbs s ri inating froth the <br /> forrrier fuel farm, <br /> t roundwat lr rnonito data.C bllect d from the expanded groundwater monitoring well ndtWft <br /> revealed that the dwvater surface t <br /> ppears to generally dip in a more easterly dire c idrt h <br /> c erivea frog the oral thr rr �t a 1 , and confirmed that first groundwater ap to <br /> h <br /> be pry t under p lly cc rt rr ed ions.. <br /> Groun ater!andl l rkult f b*i the a par ded monitoring will network suggest that <br /> non�rtratiotts+ 1em <br /> hyd rrb ns attenuate laterally away from the source area, s <br /> shown or, Fla tyre 4 , tktn":1.TPH-a -gasoline are concentrated at the former fuer farm <br /> source; and have migf its. radient directions to the north and east of the source, <br /> -, based on the groundwater anii t i results from the groundwater samples collected from MW4 <br /> and MW-8, the lateral ekton oaf Impacted groundwater is defined to the west and south ,:t the <br /> former fuel faun <br /> Results i4rn tl rtst+nat'rn rndcated'that a relatively porous sandy irte�val e ' sth <br /> the gr r ate. ,. --I at adepfl �_:b ;approximately g and tg feet bgs. The analytipat <br /> results from the. soil sample collected at f+ t bgs from CPT-f and the 15 soil samples collected <br /> from the n ;, °c all borings confirm that the petroleum hydrocarbons in soil are concentrated <br /> beneath the =owner fuel farm and defined to s depth of approximately 50 feet bgs. The analytical <br /> results from the groundwater sample collected at 104 feet bgs from CPT-I suggest that vertically <br /> the concentrations of petroleum hydrocarbons attenuate significantly below the groundwater tom; <br /> but do not appear to be fully defined. <br /> Based on these conclusions, Damage Environmental recommends that the newly-expanded <br /> monitoring will network be monitored and sampled on a quarterly basis to confirm groundwater <br /> floe and gradient characteristics and petroleum hydrocarbon plume stability. Any additional site <br /> investigation activities to further define the extent of impacted groundwater should wait until at <br /> bast two additional quarters of groundwater monitoring results are available. <br /> i <br /> .P <br /> 13 <br />,u <br />