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• wash iack in the CSMS building Pieviously identified hydraulic oil contamination, detected at 10 feet b,-,s in boring B7 appears to be limited to shallow soils in the �,icinity of that boring No further investigation is recoinniended for the vehicle wash rack area A trace concentiation of Hydraulic oil-weight petroleum hydiocarbon, previously detected at the fonuei hazardous material storage shed, was not confirmed during follow-up sampling Two soil samples collected from boring B10b did not contain concentiations of extiactable hydrocarbons and metals concentiations were below regulatory guidelines No further investigation is recommended fol the fonner hazardous materials storage area One soil sample was collected from boring B11, located near the sandblasting area Laboratory analysis did not detect concentrations of metals exceeding regulatory guidelines Thirty soil samples were collected from 10 borings along the north boundary drainage ditch No evidence was found to confine the pi esence of petroleum hydrocarbons, lead, and zinc detected in previous surface samples The likelihood of extensive lateral or vertical impacts from the pie-viously detected contamination is considered very low No further investigation is reconunlended for the north boundary di ainage ditch Bluish white crystalline powdei identified beneath the pavement upwelling areas kvas determined to contain high copper concentrations and was tentatively identified as copper sulfate The powder ieportedly has no hazardous properties, but is toxic if ingested The extent of the buried • chemical was not determined but is not expected to extend beyond the upwelling areas Versar recommends removal of an estimated 100 cubic vards of soil for disposal at a Class I landfill OMS Areas of concern at the OMS comprise the former vehicle fueling station in the parkmg lot between the OMS and CSMS, and the vehicle wash rack south of the OMS building Elevated concentrations of petroleum hydiocarbons weie detected at depths of 10 to 25 feet bgs in March 2002 The findings of the 2004 investigation identified petroleum hydrocaibons in deep soils and in groundwater beneath the fonner vehicle fueling station The lateral extent of groundwater impact was not deterinined to the north, east, or south The lateral extent of groundwater impact was tentatively defined to the east and northwest by soil borings B33 and B34 Further investigation is recommended to determine the lateial extent of petioleum hydiocarbons in gi oundwater Evidence of extensive impacts fioin the previously detected petroleum hydrocarbon contamination at the vehicle wash rack was not encountered Evidence of groundwater impact was not detected No furthei investigation is ieconurrended for the Vehicle inspection Rack i 104700 4766 230108SEPT20D4 1i1