<P>64The Military Engineer L January-February L 2010 monitoring (NAM). After four quarters of monitoring, the sites groundwater has reached EPA and FDEP cleanup cri- teria. Engineering Considerations During soil excavation activities to im- plement an approved Remedial Action Plan (RAP), the project team observed a continuous black organic layer exist- ing across the site at approximately 3-ft below grade that would have affected the ability of the soil vapor extraction (SVE) and dual-phase extraction sys- tems to remediate the site. During hot spot soil removals, liquid containing hydrocarbon sheen was seen trapped above a plastic liner beneath a concrete ?re training pit. The team performed an engineering and cost analysis to ascertain the best remedial approach to deal with the unforeseen site conditions. Options included modi?cation of the SVE sys- tem to treat soils above and below the organic layer, on-site soil land farm- ing and on-site soils aeration. Based on costs and meeting the contract pe- riod of performance, soils aeration and ISCO was determined to be the best option to treat both soils and ground- water. Based on an engineering analysis of site geology and hydrogeologic char- acteristics, additional RAPs for the site were prepared and submitted for ap- proval to the client, AFCEE and FDEP. Remedial action alternatives consisted of on-site soils aeration and ISCO. The solution has been effective: On a pilot test, BTEX concentrations were reduced from 4,749-parts per billion (ppb) to less than 3-ppb, while tests on groundwater showed a 99 percent reduction of VOCs following remedial activities. Aerated soils were then reused as back?ll for the excavations. For the full-scale soils treatment, TolTest excavated 7,632-yd3 of soil from depths of between 6.5-ft and 7.5-ft and ran it through a trommel unit—a heavy- duty power screen with a 9-yd3 hopper and a 5-ft by 10-ft rotary screen—at a rate of 150-yd3 per hour. Soils were processed two to ?ve cycles until ?eld screening data showed contaminant levels of less than 100 parts per million (ppm) measured with an organic va- por analyzer (OVA). The maximum soil stockpile pretreatment OVA concentra- tion was 40,553-ppm. Two ISCO injection events were per- formed for remediation of the free prod- uct in the groundwater: In June 2007, approximately 8,820-gal of reagent was injected, and in August 2007, an addi- tional 9,180-gal of reagent was injected. Due to lower-than-expected BTEX lev- els between the ?rst and second injec- tions, additional injections were not necessary, and active site remediation was terminated. Regulatory Issues TolTest worked in partnership with Tyndall AFB environmental of?cials and FDEP to ensure compliance with all regulatory guidelines. As per Florida Administrative Code (FAC) Chapter 62-770, NAM com- menced upon attainment of NADC concentrations in groundwater and no soil contamination. The NAM required a minimum of one year of quarterly groundwater monitoring. Because the contaminant plume was shown to be stable or shrinking, the project team pursued a No Further Action determi- nation under Risk Management Op- tions Level II in accordance with Chap- ter 62-770.680(2). After four quarters of monitoring, the site met cleanup stan- dards. Milestones The Little Cedar Creek Fire Training Area project was a results based product delivery task order with six performance objectives or milestones to be met with- in a year-year period of performance. Using an innovative approach, each of the milestones was achieved under the performance-based contract. During the ?nal stages of monitoring, Tyndall AFB was involved in a Resource Conservation and Recovery Act (RCRA) order that transferred the regulatory oversight of Site FT023 from FDEP to EPA Region 4. Quarterly sampling and reporting took place from April 2008 to April 2009. Having met the perfor- mance objective of reaching FDEP cleanup standards, TolTest submitted the Site Rehabilitation and Completion Report (SRCR) to the Air Force on May 18, 2009. The remediation activities succeeded where others failed. Thorough plan- ning, knowledge of state regulations and communications with Tyndall AFB, AFCEE and FDEP enabled the project team to remove the free product and eliminate soil and groundwater con- tamination at Site FT023 within the period of performance. Free product was reduced from .5-ft to less than the GTCLs. Robert Beckwith, PG, is Environmental Manager, TolTest Inc.; 419-794-3570, or bob.beckwith@toltest.com. Typical injection arrays for groundwater treatment by ISCO at the site included multiple injection sites like the one shown here.</p> <UL><LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/1/Front-Cover/" >Front-Cover</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/2/Inside-Cover/" >Inside-Cover</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/3/Page-1/" >Page-1</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/4/Page-2/" >Page-2</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/5/Page-3/" >Page-3</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/6/Page-4/" >Page-4</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/7/Page-5/" >Page-5</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/8/Page-6/" >Page-6</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/9/Page-7/" >Page-7</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/10/Page-8/" >Page-8</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/11/Page-9/" >Page-9</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/12/Page-10/" >Page-10</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/13/Page-11/" >Page-11</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/14/Page-12/" >Page-12</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/15/Page-13/" >Page-13</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/16/Page-14/" >Page-14</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/17/Page-15/" >Page-15</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/18/Page-16/" >Page-16</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/19/Page-17/" >Page-17</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/20/Page-18/" >Page-18</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/21/Page-19/" >Page-19</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/22/Page-20/" >Page-20</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/23/Page-21/" >Page-21</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/24/Page-22/" >Page-22</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/25/Page-23/" >Page-23</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/26/Page-24/" >Page-24</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/27/Page-25/" >Page-25</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/28/Page-26/" >Page-26</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/29/Page-27/" >Page-27</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/30/Page-28/" >Page-28</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/31/Page-29/" >Page-29</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/32/Page-30/" >Page-30</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/33/Page-31/" >Page-31</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/34/Page-32/" >Page-32</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/35/Page-33/" >Page-33</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/36/Page-34/" >Page-34</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/37/Page-35/" >Page-35</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/38/Page-36/" >Page-36</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/39/Page-37/" >Page-37</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/40/Page-38/" >Page-38</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/41/Page-39/" >Page-39</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/42/Page-40/" >Page-40</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/43/Page-41/" >Page-41</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/44/Page-42/" >Page-42</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/45/Page-43/" >Page-43</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/46/Page-44/" >Page-44</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/47/Page-45/" >Page-45</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/48/Page-46/" >Page-46</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/49/Page-47/" >Page-47</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/50/Page-48/" >Page-48</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/51/Page-49/" >Page-49</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/52/Page-50/" >Page-50</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/53/Page-51/" >Page-51</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/54/Page-52/" >Page-52</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/55/Page-53/" >Page-53</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/56/Page-54/" >Page-54</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/57/Page-55/" >Page-55</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/58/Page-56/" >Page-56</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/59/Page-57/" >Page-57</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/60/Page-58/" >Page-58</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/61/Page-59/" >Page-59</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/62/Page-60/" >Page-60</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/63/Page-61/" >Page-61</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/64/Page-62/" >Page-62</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/65/Page-63/" >Page-63</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/66/Page-64/" >Page-64</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/67/Page-65/" >Page-65</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/68/Page-66/" >Page-66</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/69/Page-67/" >Page-67</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/70/Page-68/" >Page-68</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/71/Page-69/" >Page-69</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/72/Page-70/" >Page-70</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/73/Page-71/" >Page-71</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/74/Page-72/" >Page-72</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/75/Page-73/" >Page-73</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/76/Page-74/" >Page-74</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/77/Page-75/" >Page-75</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/78/Page-76/" >Page-76</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/79/Page-77/" >Page-77</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/80/Page-78/" >Page-78</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/81/Page-79/" >Page-79</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/82/Page-80/" >Page-80</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/83/Page-81/" >Page-81</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/84/Page-82/" >Page-82</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/85/Page-83/" >Page-83</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/86/Page-84/" >Page-84</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/87/Page-85/" >Page-85</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/88/Page-86/" >Page-86</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/89/Page-87/" >Page-87</a> <LI><a href="http://www.stallionpublishers.com/publication/286/rhbgvjbgb/90/Back-Cover/" >Back-Cover</a> <LI><a href="http://www.stallionpublishers.com/publications/286/x/sitemap.xml" target="_blank">site map</a> </UL>

 

If you would like to view publication without flash plugin, please click on link below




To view your publication, you need to upgrade your Flash Player
Click here to install latest flash player.