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WOOLSEY OIL <br /> CHRONOLOGY <br /> TANK#1 2000 GAL UNLEADED REMOVED 11-10-89 <br /> TANK#2 2000 GAL REGULAR REMOVED 11-10-89 <br /> TANK#3 8000 GAL MOTOR OIL REMOVED 11-10-89 <br /> TANK#4 8000 GAL KEROSENE REMOVED 11-10-89 <br /> TANK#5 8000 GAL MOTOR OIL REMOVED 11-10-89 <br /> TANK#6 4000 GAL HYDR OIL REMOVED 11-10-89 <br /> TANK#7 4000 GAL MOTOR OIL REMOVED 11-10-89 <br /> TANK#8 4000 GAL MOTOR OIL REMOVED 11-10-89 <br /> TANK#9 4000 GAL MOTOR OIL REMOVED 11-10-89 <br /> TANK#10 550 GAL WASTE OIL REMOVED 11-10-89 <br /> TANK#11 550 GAL WASTE OIL REMOVED 11-10-89 <br /> 11-10-89 Eleven underground storage tanks were removed from the property this date under permit <br /> and guidance of PHS/EHD. <br /> 19 soil samples were obtained from beneath the tanks at approx. 12'- 14' bgs. In addition <br /> to the low amounts of contamination noted from beneath tanks#4, #5, and#8, low levels <br /> of metals (background) and 1.0 ppm and 0.6 ppm of bis (2-ethylhexyl) phthalate was <br /> detected beneath the two 550 gallon waste oil tanks. <br /> Please refer to Table 1 for the results of the tank removal. <br /> 01-10-90 The areas around former tanks#4, #5, and#8 were over-excavated this date. Two soil <br /> samples were obtained from the finished excavation from each former tank pit area. <br /> Please refer to Table 2 for the soil results. <br /> 03-15-95 Two soil borings/hyrdopunch were installed at the site this date to confirm soil impact to <br /> be minimal and to verify groundwater quality has not been threatened. The first soil <br /> boring/hydropunch location was through the former waste oil tank pit area. There was no <br /> evidence of soil contamination during drilling and the soil type was mostly silts. All <br /> attempts at obtaining a groundwater sample from this boring were futile. <br /> The second soil boring/hydropunch location was in the comer of the former tank#5 pit <br /> area where the residual soil contamination was evidenced after the 1990 over-excavation. <br /> This boring did not show any evidence of soil contamination and a groundwater sample <br /> was obtained from approx. 25' bgs from a silty sand layer. Please refer to Table 3 for the <br /> results of the groundwater sample obtained during this verification field visit. <br /> 0417-95 PHS/EHD receives recommendation for closure and concurs. <br /> I <br />