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PVA DD IAT ES 8-1 rest�t�-5 In April of 1992, WHF Consultants excavated approximately 1,200 cubic yards of �-.. Y petroleum- affected soil from the former Tank #4 area. The affected soils were transported to the Union Ice facility on Weber Street and bioremediated. The excavation extended to a depth of k approximately 35 feet bgs and was terminated to the west at the Union Pacific rail line right of way, and to the north and east at the edge of the existing ice manufacturing building. F4 Confirmation samples collected from the sidewalls and floor of the excavation indicate e no detectable BTEX, and up to 138 mg/kg of TPH as kerosene (TPH-k) in the north and west N , sidewalls at a depth of approximately 20 feet bgs. f Groundwater monitoring at the site between June 1992 and October 1995 has yielded reported TPH-d concentrations up to 0.4 mg/L and no detectable BTEX concentrations' in the vicinity of Tank #4 (Wells MW-5 and MW-3). The wells in the vicinity of Tank #3 (MW-1 and MW- 2), have yielded TPH-g at concentration up to 1.3 mg/L, TPH-d up to 0.2 mg/L, benzene up to 50 s �Cg/L, toluene up to 9 Mcg/L, ethylbenzene up to 40 Mcg/L, and total xylenes up to ! 63 #g/L. t 3.0 PURPOSE \ The objectives of the recent investigation were to 1) identifythe source(s)O of aromatic hydrocarbons impacting groundwater at the,site; 2) evaluate the lateral and vertical extent of ' �E - 1 hydrocarbons in the vadose zone to allow for the preliminary design of a soil treatment system, if further remediation is deemed necessary, and 3) gain information that will facilitate site closure. Because benzene was the only aromatic that exceeded drinking water standards, it F; was the focus of the investigation. Previous soil sampling efforts near Tank #3 yielded soil samples containing aromatics (toluene) ` . detected down to the water table. However, the monitoring wells that have had detectable ! concentrations of aromatics are located downgradient of Tanks #1 and #2, in addition to being ' The first sample collected from MW-5 in October, 1994 indicated benzene present at the detection limit of 5,ug/I ; however, benzene was not detected in the duplicate sample from the same monitoring event(less than 1 subsequent samples(less than 0.5 pg/L)nor in any hg/L.). The single detection is therefore suspected to be a laboratory artifact. R41820A-625960-3 unionice Jsoilgm3.wpd 3