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• � 3:3 KLEIiVFE L D E R <br /> to groundwater measurements will then be converted to relative groundwater elevations with <br /> respect to mean sea level or a local benchmark by subtracting them from the surveyed casing <br /> elevations. <br /> The resulting groundwater elevations will be, used to assess the direction of the groundwater <br /> gradient at the time of sampling. This information can then be used to assess which wells <br /> represent upgradient and which wells represent downgradient groundwater conditions. <br /> The monitoring wells will be purged and sampled using a disposable bailer. A total of three <br /> groundwater samples will be submitted to a State certified laboratory for the following analyses: <br /> ➢ Dissolved California Assessment Manual(CAM-17)metals by EPA 6000/7000 series; <br /> ➢ Volatile Organics by EPA Method 8260 <br /> ➢ Total Extractable Petroleum Hydrocarbons as referenced to diesel and Motor Oil [TPH-D/TPH- <br /> MO] by DHS/LUFT. <br /> ➢ Total Purgeable Petroleum Hydrocarbons as referenced to gasoline [TPH-G].by EPA 8015M <br /> ➢ Ethylene Glycol By NIOSH 5500 Modified <br /> The samples will be submitted for analysis on a normal laboratory schedule requiring <br /> approximately two weeks (10 working days) for completion unless the optional rush analytical <br /> turnaround is requested by the client at an additional charge. <br /> Purge water generated during development and sampling of the well, as well as other investigation <br /> derived waste (i.e. drill cuttings, steam cleaning water, etc.), will be contained.in 55-gallon drums <br /> and left onsite. Disposal will be the responsibility of the client. If requested Kleinfelder can assist <br /> with disposal at an additional cost. <br /> Task 4.0—Limited Soil Sampling <br /> Kleinfelder proposes to collect"a total of 32 soil samples from sixteen soil borings located in the <br /> vicinity of a concrete pad noted in the southwest portion of the subject site. Kleinfelder is <br /> proposing chemical analyses of 22 of the 32 soil samples: The remaining 10 soil samples will-be <br /> placed on hold. The sampling locations were selected using former soil sampling results reported <br /> by WHF. The actual sampling locations will be dependent on access, surface conditions, and <br /> potential interference with subsurface utilities. <br /> Six of the boring locations will be located in the immediate vicinity of the concrete pad and near <br /> former sampling locations (interior locations) conducted by WHF consultants. Ten.soil borings <br /> will be located around the concrete pad but at step-out locations (perimeter locations) to.assess <br /> the potential lateral extent of lead impacted soil. A total of twenty soil samples will be collected <br /> from the perimeter boring locations, two at each soil boring location. These perimeter soil <br /> samples will be collected at shallow depths alternating between 1 and 2-feet bgs and at a depth of <br /> 5 feet bgs.. Twelve soil samples will be collected from the six interior sample borings, two from <br /> each'boring at depths of 2 and.5-feet bgs. <br /> 42162.E01 /ST04P 141 Page 5 of 9 <br /> Copyright 2004,Kleinfelder,Inc. March 30,2004 <br />