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C -�PW- <br /> LEAR�ITER <br /> G R O U P I \ C <br /> En ern rvmrnt rl iernurs <br /> better understand the distribution of contamination and possible contribution from potential off-site <br /> sources The results of this phase of investigation were presented in Clearwater's Well Installation <br /> and Groundwater Monitoring Report- First Quarter 1999 <br /> 2.3 Purpose of Additional Site Assessment <br /> As stated in the Clearwater workplan, the purpose of this report, and work associated with it, is to <br /> further delineate the extent of soil and groundwater contammation around the site, and to determine <br /> if there is a potential off-site source To that end, Clearwater supervised the completion of one <br /> hydropunch, six soil borings, constructed three monitoring wells, the destruction of monitoring <br /> well MW-5, development of new wells, sampled all wells, and surveyed all wells to a common <br /> accurate datum <br /> 3.0 SOIL BORINGS, WELL INSTALLATION, AND WELL DESTRUCTION <br /> ACTIVITIES <br /> On March 8, 2000, Clearwater supervised the completion of one hydropunch, six soil borings, the <br /> destruction of MW-5, and built three additional wells MW-5B, MW-7, and MW-8 (Figure 2) All <br /> three wells were placed on the downgradient portion of the plume to help determine the <br /> downgradient extent of contaminants The hydropunch was performed in the former UST location <br /> to assess the vertical extent of hydrocarbons Three soil borings were performed to define the <br /> lateral extent of soil and groundwater contamination on the northeastern portion of the site and <br /> assess possible off-site sources <br /> Soil samples were collected from each boring during drilling activities at five foot intervals for <br /> sedimentological assessment and possible laboratory analysis All soil samples were screened in <br /> the field using a TEI Model 580 Organic Vapor Meter (OVM), and three samples were analyzed <br /> from each boring based on OVM readings, and from the capillary fringe Soil samples for <br /> analysis were then chilled and shipped to the project lab for determination of concentrations of fuel <br /> hydrocarbons (gasoline-range hydrocarbons by EPAM 5030/8015M), volatile aromatic <br /> compounds (benzene, toluene, ethyl benzene and xylenes by EPAM 8020), and the gasoline <br /> additive MTBE by EPAM 8260 Soil sample MW-5B-25' was also analyzed for Jet Fuel range <br /> hydrocarbons by EPAM 3550/8015M <br /> ZB 178C 3 3/31/00 <br />