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i <br /> Geological Teckntcs Inc. { <br /> Confirmation GW Sampling WP <br /> Project No. 770.2 <br /> February 28,2011 <br /> the presence and locations of water supply wells reported to be located within a 600 foot <br /> radius of the site. For purposes of establishing the 600 foot radius, the site will be defined as <br /> the release. <br /> GTI will then make reasonable efforts to obtain permission from the property owners to <br /> access and sample the identified wells. Sampling of identified water supply wells is <br /> discussed in Section 2.3 below. <br /> I' <br /> 2.2 Conformational Groundwater Grab Sampling(GeoProbe®) <br /> Conformational groundwater grab samples will be targeted in the groundwater between the <br /> on-site source area and the water supply wells in the down-gradient and obliquely down- <br /> gradient directions in the unmonitored depth intervals where impacted groundwater <br /> commonly occurs on-site. <br /> The following locations and depths have been selected to provide information primarily in <br /> the southern portions of the site. It is anticipated that the 'sample locations and depths as <br /> described below will target coarse grained units, and will define the lateral and vertical <br /> extents of the plume in the southern portions of the site. tea° <br /> Up to four (4) direct push boreholes will be advanced in the proposed locations indicated in <br /> Figure 2. Groundwater samples will be collected at the intervals listed below. 5�� <br /> Proposed Sample Location Groundwater Sampling Interval <br /> GW-1 65' & 85' �isa vim' <br /> GW-2 65', 80' &95' <br /> GW-3 65', 80' & 95' ?, <br /> GW-4 80-85' 0 iL c,Pr <br /> 446 <br /> The boreholes will be drilled with a direct push rig owned and operated by a driller with a <br /> C57 license. The rig advances a direct push coring tool with a pneumatic hammer to a <br /> selected depth. <br /> A boring log providing sediment description using the USCS and other field observations <br /> will be maintained by a geologist working under the supe'r'vision of a professional geologist. <br /> Although no soil contamination is anticipated to be encountered, GTI technical field staff will <br /> have a portable photo ionization detector (PID) that uses a:,10.6eV lamp to detect compounds <br /> with ionization potential below 10.6 eV (hydrocarbon range). PID readings will be taken <br /> based on subsurface findings at the discretion of GTI field staff. <br /> Upon reaching the capillary fringe in each borehole, a hydropunch-type groundwater- <br /> sampling tool will be advanced into the groundwater and a groundwater sample will be <br /> Geological Technics Inc. 4 <br /> 7702 Confirmation GW Sampling 2-25-1 l.doc <br />