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• . M 5c ll riuUders, lnc. <br /> July 13, 1994 <br /> �. <br /> Page 3 <br /> Headspace vapor screening involves placing a soil sample in a plastic samp�e bag. Air is <br /> captured in the bag, and the bag is shaken to expose the soil to the air uapped in the bag. The <br /> probe of a Bachazach TLV Sniffer is inserted in the bag, and the TLV Sniffer measures the <br /> wncentration of combustible vapors present within the sample bag headspace. Headspace vapor <br /> screening targets volatile petroleum hydrocarbon compounds. The TLV Sniffer measures <br /> combustible vapor concentrations 9n ppm (p�s per million) and is calibrated to hexane. The <br /> TLV Sniffer is designed to quantify combustible gas concentrations up to 10,000 ppm• <br /> Field screening techniques did not indicate the pcesence of petroleum-related compounds <br /> at the site. Petroleum sheens and combustible headspace vapors were not detected in the soil <br /> samples. Visual examination of soil from test piu and surface azeas of the site did not indicate <br /> the presence of any contaminants at the site. <br /> CON�LUSIONS <br /> Minimal amounts of fill and/or loose topsoil were observed at the site. Native soils consist <br /> of ineclium dense sand with vary�ng amounts of silt and gravel. Our subsurface obsenatioas of <br /> the native tap of slope ue in good agreement with the Top of Bank line mazked on the "Hoyt <br /> Short Plat" dated March 1, 1994. We recommend a minimum setback of 25 feet from the native <br /> top of slope for residential buildings at the site. In our opinion the slope toward Pigeon Creek <br /> No. 2 will remain stable provided that site drainage is not routed over the top of the slope. <br /> Baae3 on field screening and visual examination of subsurface and surface soils at the site, <br /> in our opinion, there is no indication of L5e presence of contaminants at the site. In our opinion, <br /> the methods used to evaluate the potential contamination are consistent with WAC <br /> 173-340-310(2). � <br /> _ � O ► <br /> We uvst that this letter meets your needs and satisfies the City of Everett requirements. <br /> Please cail if you have ques[ions regarding this letter. <br /> Yours very truly, <br /> GeoEngineers, Inc. <br /> ��, �� <br /> W. Stephen Lewis <br /> Project Hydrogeolo �st <br /> �l�Zl� �"/ ��'�G� <br /> •"Qordon M. en y, P.E. <br /> Principal <br /> WSL:GMD:wd <br /> Dwumrn�ID:383IOOI.CO�i <br /> File No.78J1-001-A05 <br /> G e o E n g i n e e r � <br />