February 12 to February 14, 2004 Continued installation of railroad spur behind building #1. RR spur was completed on February 12, 2004. On 2/10/04, ERRS started encapsulation of area above office space (mezzanine area) with asbestos encapsulating product. Completed decontamination of Building #1. Personal and perimeter air sampling continued through February 12, 2004. On February 13, 2004, START and ERRS collected 12 confirmation wipe samples and 10 Microvac samples from inside decontaminated buildings. Ten clearance TEM AHERA air samples were also collected on February 13, 2004, while space heaters and the furnace provided air circulation. Five samples were collected from each building, Building #1 and Building #2. Water stored on-site from decontamination operations was treated on February 12, 2004 and sampled on February 13, 2004 for disposal parameters required by the State.
February 16 to February 21, 2004 Treated water was stored until analytical results were received indicating the water was safe for discharge. Treated water was discharged on February 20, 2004. ERRS completely dismantled the on-site water treatment system and continued backfilling and regrading in the excavation area. Analytical results from confirmation air, wipe and Microvac sampling were received. Some low levels of asbestos fibers were detected in some air and wipe samples. OSC Bass consulted with ATSDR on analytical results. On February 19, 2004, START collected two TEM air samples at the Wilder Fire Station at the request of OSC Bass. Fire station officials had some concerns about vermiculite from the W.R. Grace facility that was used during the expansion of the current fire station. Analytical results indicated no presence of asbestos in the air samples collected at the Wilder Fire Station.
February 23 to February 29, 2004 ERRS continued site restoration activities, soil from site embankment being regraded into ACM excavation area. ERRS performed additional deconatamination in Building #1, specifically in the Mezzanine area above the office area, using a 50/50 mixture of water and Greased Lightning. The wipe sample collected here indicated the highest remaining asbestos concentrations, in the form of chrysotile asbestos. Although the original clearance air samples collected were below a health-based risk level, based upon recommendations from ATSDR, OSC Bass requested additional confirmation air samples be collected, using aggresive sampling procedures which included the use of fans and leaf blowers to stir up air in the buildings. START collected additional TEM AHERA confirmation air samples on February 26, 2004. Sample locations were identical to previous confirmation air samples. A total of ten samples, five in each on site building were collected. Analytical results expected March 1, 2004. On February 27, 2004 the last roll-off dumpster containing ACM from the decontamination of the buildings and the water treatment system was transported and disposed of. ERRS worked overtime on Saturday and Sunday, Feb 28-29, due to anticipated heavy rains Monday and Tuesday, Mar 1-2. Working over the weekend allowed ERRS to finish grading work they had already begun and allowed them to grade the site so that water would run-off and not stand. If this earth work had not been done prior to the rains, the wet and muddy weather conditions would have destroyed the grading already begun and caused major delays.
March 1 to March 4, 2004 No site work was conducted on March 1-2, 2004, due to rainy and muddy weather conditions. All analytical results from the final TEM AHERA air clearance samples, using the ATSDR recommended aggressive sampling method, came back non-detect for asbestos fibers. March 3-4, 2004, ERRS continued to dismantle the shower and decon trailers and prepare them to be demobed.
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