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1 <br /> <br />1 <br />1 <br />1 <br /> <br /> <br /> <br />1 <br /> <br />Aggregate Industries - F Street Site Characterization Report <br />Project Number [00[018 PnxncoN <br />October 9, 2001 <br />Page 4 <br />Soil samples were collected during completion of MW-l and MW-2 using split-spoon <br />sampling techniques. Two (2) soil samples were selected from MW-2 and transported under <br />standard Paragon chain-of-custody procedures to Technology Laboratory, Inc. (TLI) in Fort <br />Collins, Colorado for benzene-toluene-ethylbenzene-xylenes (BTEX) and total extractable <br />petroleum hydrocarbons (TEPH) analyses. Those samples were selected for chemical <br />analysis based on olfactory and visual observations. Results of the laboratory analyses are <br />discussed in Chapter 5. <br />3.2 Groundwater Monitoring Wells <br />Monitoring wells MW-1 through MW-4 were constructed with 2-inch diameter PVC <br />manufactured well screen and casing to depths of approximately 19.5 to 34.5 feet below site <br />graties. Well construction details are shown on the boring logs provided in Appendix D. In <br />addition to wells MW-1 through MW-4, well EW-1 was installed at the site by Aggregate <br />Industries personnel during the backfilling of the abatement excavation. That well was <br />constructed with 24-inch diameter ADS drainage pipe to a depth of approximately 13 feet <br />below grade. The approximate locations of wells MW-1 through MW-4 and EW-1 are <br />shown on Figure 3 in Appendix A. <br />' 4. SUBSURFACE CONDITIONS <br />Subsurface conditions observed at the site are presented in this chapter. The individual <br />' topics of stratigraphy, groundwater observations and piezometric surface are discussed in the <br />following sections. <br />1 <br />t <br />1 <br />4.1 stratigraphy <br />The: subsurface conditions observed in MW-l through MW-4 can be generalized as follows. <br />The: wells were completed in unpaved areas. Fine to coarse sand with varying amounts of <br />clay, silt and gravel was observed from near or at the ground surface in MW-l, MW-3 and <br />MW-4 to the bottom of those borings which ranged from depths of approximately 20 to 35 <br />feet below the ground surface (bgs). In the boring for monitoring well MW-2, clayey silt or <br />clay with varying amounts of gravel was observed from the ground surface to approximately <br />l2 feet bgs. Those fill materials from backfill of the abatement excavation were underlain <br />by varying amounts of clay, sand and gravel to the bottom of the boring which was <br />completed to a depth of approximately 26 feet bgs. <br />Descriptions of the soils encountered in the borings are provided on the boring logs included <br />in Appendix D of this report. Field logs of the borings were prepared by the Paragon field <br />