etre.pdf - This design project involves the use of publicly...

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CE 599 DP1 (Spring 2021) - 1 of 4 This design project involves the use of publicly available tools developed by USEPA to design “screening” assessment plan in a community where vapor intrusion exposure risks may be a concern. The site is shown below and will target three buildings: A, B and C. The groundwater concentrations included in Table 1 are actual concentrations detected at the site. Although these concentrations were detected several years ago, it is common for vapor intrusion professionals to evaluate historical groundwater concentration trends as part of vapor intrusion screening assessments to determine if additional evaluation is warranted. Building A includes a three-story multi-family home (basement depth approximately 5.5 feet bgs) with a paved patio (approximately 32 ft by 23 ft) and a grassy area (42 ft by 29 ft) northwest of the home. Building B includes an open space grassy field (approximately 50 ft by 50 ft) with a three-story multifamily home (basement depth approximately 5.5 feet bgs) is located in the southwest corner. Building C is a slab-on-grade building that was used for commercial purposes (assume the building slab is 6 inches thick). The entire surface area for Property C was asphalt paved (maximum dimensions were approximately 58 ft by 93 ft). The contaminant source is located to the west of these properties. The depth to groundwater fluctuated from 10 ft bgs to 13 ft bgs depending on the season. The soil geology was surprisingly consistent across the site, including two primary soil types: an upper unit (0-6 ft bgs) consisting of urban fill (assume: sandy loam); and, a lower unit (6- 12 ft bgs) consisting a dense, stiff, sandy clay loam. Near the water-bearing unit, a sandy loam was detected in some soil borings.
CE 599, TABLE 1 - Design Project 1: Vapor Intrusion Sample Location Date Units in µg/L Sample Location Date Units in µg/L PCE TCE PCE TCE Geo - 3 9/15/2004 4020 507 MW - 102 5/23/2006 200 15.6 5/23/2006 162 14.4 10/4/2006 896 89.1 10/3/2006 2720 209 1/15/2007 692 57 1/15/2007 529 70.2 4/12/2007 20.3 2 4/12/2007 93.2 10 7/17/2007 524 46.1 11/2/2010 94 77 10/9/2007 685 61 Geo - 4 8/15/2004 12900 720 1/9/2008 606 65.3 5/23/2006 6690 86.8 4/16/2008 438 35.6 10/3/2006 24100 235 11/2/2010 74 6.5 1/15/2007 16700 129 MW - 103 5/23/2006 2600 109 4/15/2007 8240 74.8 8/6/2006 592 24 11/2/2010 8100 100 10/4/2006 1510 60.4 Geo - 5 8/15/2004 14400 404 1/15/2007 1200 37 5/23/2006 2440 146 4/12/2007 1510 58.7 10/3/2006 12900 446 11/2/2010 CNS CNS 1/15/2007 254 <50 MW - 109 1/17/2007 178 4.5 4/15/2007 17.9 <1.0 4/15/2007 28.5 <1.0 11/2/2010 6100 190 4/16/2008 17.4 <.5 Geo - 6 9/15/2004 782 122 11/2/2010 CNS CNS 5/23/2006 675 78.8 MW - 110 1/17/2007 0.89 <1.0 10/3/2006 1980 131 4/16/2007 0.93 <1.0 1/15/2007 632 75.3 11/2/2010 <2 <2 4/15/2007 618 55.5 MW - 111 1/17/2007 13700 150 11/2/2010 25 7.2 4/15/2007 7370 84.4 Notes: 7/17/2007 6340 120 CNS-Could not sample < #, not detected above #. PCE: Tetrachloroethylene TCE: Trichloroethylene 10/9/2007 8350 125 1/9/2008 3100 42.1 4/16/2008 1160 19.9 11/2/2010 880 12 SRP-MW-B 11/2/2010 300 33
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