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

Field sampliog and anelytical melhodologies employed during this assessment are described in "Site HisWry RepoR and Work Plan for Environmental Audit, Proposed Northeast View Park, Everett, , Washington." The iaitial phase of the 6eld exploration program was conducted at the Site on Deccmber 4 aad 7, l992 and the follow-up phase wes wmplete�February 2, 1993. A total of 27 soil samples wero collected including 6 composite samples from hand-auger borings, 18 samples from test pits, end 3 surface samples from the "sand cap" and Langus Park dredged materials. Sample locetions are a6own in Figure 2. 5.0 FIELD EXPLORATION PROGRAM AND ANALYTICAL RESULTS — 'Ibis section discusses the results of the field exploration program . d the analytical resulu. The analytical results of soil samples collected during t6e field prograro are summarized in Table 1. Complete laboratory repoAs and data validation memorenda are included in Appendices A and B, respectively. 5.1 TEST PIT EXCAVATIONS During the initial phase of the fidd exploraGon program, four test pits (fest Pits 1 through 4) wero excavated W assess the naturo of coostructlon debris proviously deposited on the nocth paicel of the Site. Test pit locations are s6own on �gure 2. Test pits wero excavated with a beckhce, first removing the layer of saady sediment "cepping" the conshuction debris fill. Subsurface soils wero screcned for visual evidence of — contamination. Soils were also scroened wiW on Orgenic Vapor Meter (OVIvQ for the presence of volatile , ; orgenic vapocs. 1Wo subsurFacxi soil samples wero collected from each test pit and submitted for analysis of heavy metals and hydrocerbon identification. Positive 6ydrocarbon identification lead m fuRher quentitetive _ aoalysis fnr the presence of heavy oil or diesebrange hydrocarbons. Besed on analytical results fr�m the fint pLase of the field exploration program, an addidonal five test pits wero ezcavated to asuss the lateral extent of hydrocarbon coatamivaGon around Test Pits 1 and 3. These test pits wero lebeled IA, 1H, 3A, 3B, and 3C. 1Wo soil samples were collxted fmm each additionel test pit firc hydrocarbon identification and one samp:;from eac6 additional test pit was submitted for analysis of vola��le organic compounds. ConstcucGon debris, observed during the excavatian of the test pits consists mainly of soil, asphalt, wire, end concrete chunks, some as large as tWo feet in diameter. Additional material observed in individual test • pits is described in t6e following sections. Positive readings on the OVM were not recorded during the wurse of the excavations. 5.1.1 Test 't 1 �" Test Pit I was Iocated at the noRhem end of the noR6 parcel. Construction debris was encountered between 1.5 and 7 fcet bgs and was limited to soil, wire, asphelt, and concrete. Stainal soils wero observed at a depth of approximately 2 foet bgs. � Petmleum 6ydrocarbons ia the heavy oil range were detected in the sample collected from 2 feet bgs at ' a concentration of 230 milligrams per kilogrnm or ppm. Petroleum hydrocarbons wero not detectal in the _ sample wllected from 6 foet bgs. T6e MTCA cleanup level for heavy oil is 200 ppm in residential soil. Arsenic was detected in the sample collected from a depth of 2 fezt bgs at a concentcation of 27 ppm. The MTCA cleanup level for acsenic in residential soil is 20 ppm. Based on the analytical results of semples 5