721 E MARINE VIEW DR 2016-01-01 MF Import

2 and 4 feet bgs in Test Pits 1, 3 and 3A. Although petroleum soil conceotratioos arz present above t6e MTCA soil clean up level, contaminated np�ears to occur in isolata] locatioos chroughout the disposal area and is limited in laterel and vedical eztent. Metal concentcations and volatile organic compounds in soil samples analyzed W'ere either undetected or were below the MTCA Method A residential sail clean up le�.els with the exception of arsenic concentrations in three samples which were slightly above the cleanup level. _ It is unlikely that lhe acsenic conceatratious wil� re9u�re temedietion. gesed on rogiooal geology of the Site area, ground-water would most likely occur betwcen 60 and 110 feet below the cureent ground surface of the Site. Oiven the limited nsmro of petroleum 6ydmcerbon '+ conteminetion ddxted at t6e Site and the subsurface gao�ogy, it is uolikely that ground-water hes baen impacted by the presence of these compo�ods in coos�Nction debris fill deposited on the Site. — T6e "sand cap" material covering the north parce� of the Site does not appear to be uniform in depth and ranges from 0.5 to 1.5 fxt bgs. The material appears to cons�st mainly of sendy sedimenu. Chemical analysis indicates that heavy metels are present in the material, however, t6e wncentcations do not excxd MTCA cleanup levds. Surface and neu'-surfece soil samplas collected from 6and-augers on the east and west ends of the Site, and in areas other than the construction debris disposal ares contain�d erse°�°+ �edmium and lead soil concentretiooa above the MTCA Method A residential soil clean up levels at various locations. Soil semp�es collected from 6end-augers wero roprasantetive of oative geological materials. Arsenic levels canged fiom 2.7 to 505 ppm,cadmium ranged from undetected to 9.4 ppm end lead cenSed fr°m 9�•2�0 1,910 ppm. Since '"' historic rxords da not indicate the presence of weste handling,storage or disposal of chemicals in these areas� the eleveted metal concenastions are most likely associatad w�th the former Everett Smelter site. We undersrand that as of February 24, 1993,Ecology ezteaded the boundary of the Everett Smelter Site to include -� t6e proposed NoRheast View Park. 7.0 RECOD�NDATIONS ` Hased on the raults of this repoR, wa mcommend evaluating remed�al altemetives for t6e two areas of concern identifial on Ne Site: the construction debris disposal area �o�a�ed °° �e °O� Pa�� of the Site and surfaceJneac-surfece soils located Senare��Y throughout the Site. petrolwm contaminated soil concentrations above t6e MTCA Method A►�sidential soilPotent al remedial • preseat in the coostruction debris disposal acea located on the noRh end o the propeRy. a�ternatives thet may be epp�icable to the conshuctian debris area ioclu�� excavation and off-site landfill disposa�, bioremediation end capping. We understand that excava6on and removal of the construction debris , , a�d associatod petroleum conteminated soil may not be a viable optioo for the City of Everett due to the prohibitive costs. Bioremediation (or landfarming)would require soil excavation and handling and available �� space to conshuct a kestment area. Since tho patroleum is identified as a heavY o�� 11�e treatment time required to reduce the contsminatai levels below MTCA clean up levels mey be excessive without the addition of microbes. AUhoug6 this is a viable treatment technique,this altemaGve does not appear to compliment the " intended immediate use of t6e propedy as a park. ' Since it is unlikely that the petroleum contaminated soil has impacted ground-water, the installation of an �-- impermeable/semi-impermeable surface cap apPears to be the most viable alternative to cons.der. This altemative would reduce t6e rate of infiltcation and contaminant mobility and would also be protective of ' human hzalth aod t6e envirooment. Based on proGminary discussions with the Snohomish County Flealth 9