1600 MADISON ST 2016-01-01 MF Import

only discovered at a depth of 16 feet in Boring VW-2. Based on analysis of the collected -- data, contamination was suspected to be present on the adjacent (southem) residential _. property. :>ite Check Report, Dean M. Hough, P.E. Upon the conclusion of Seacor's work, Mr. Dean Hough, UST Program Manager with the _, �ity of Everett, prepazed a summary report (Site Check/Site Assessment Report) for submittal to the Washingtci Department of E.;olcgy (Ecology). This document identified that the release of gasoline from this tank likely occurred during integriry testing performed on May 15, 1991 (due to tank filling required by the testing contractor). When r.he tank was discovered to be leaking, the tank was removed and approximately 270 cubic yards of gasoline-contaminated soil was excavated, to an approximate depth of 15 feet (`"up to the south bay concrete aprou and to within five feet of t6e fire station building or, the east"). . Upon completion of the excavation, seven samples were collected from the pit and wo samples were collected from the excavated soils (the analytical results were not pre:ented in this document). This repoR also identified that grourdwater'�eneath the site was not known to be currently used for beneficial purposes (according to Eco".ogy's well-record information). 90-IDay Characterizatlon/Fi�al Report, Dean M. Hough, P.E. Mr. Hough also prepazed a site characterization report (90-Day Characterization/Final Report) for the gasoline spill. This report indicates that approximately 1,000 gallons of � gasoline was released from the tank during the several days t6at the tan�--integriry testing was being conducted (through rusted holes in the tank). The tank and the contaminated soils were immediately excavated, with the completed pit lined with plastic and backfil!ed with gravel. The results of the confirmation sampling (described above in the previous report summary} aze somewhat explained in this document, but again the analytical results aze not presented. According to this document, "the test results indicate that the north side of the pit is clean, but that the remaining sides and bottom aze still contaminated". The document goes on to present t�+e apinion that remaining contamination "is the resLlt of the lon ;-term spill from approximately 1989 to May 15, 1991. This is supported by the three metals analyses dated June 18, by North Creek Labs which shows presence of lead or the spilling of leaded gasoline from this tank". The document further describes the off-site heatment of the excavated contaminated soils (aeration at Paine Field) and ambient air sampling at the 01-0105-C-RT.doe � �'( S/� "(,�`� Copyright 2001 G•I.ogica, Ine. Page 4 of 14 � �