THE DOVER NJ MGP SITE REMEDIATION RESULTS OF THE PERIMETER MONITORING PROGRAM 2000-2001

摘要

The First Phase of remediation of the Dover NJ MGP Site was completed in January 2001. An integral facet of the approximately 190 day remediation program was a perimeter monitoring network comprised of eight fixed stations. The monitoring network designed, installed, operated and maintained by TRC Environmental under contract to GPU Energy was in continuous operation at all times that remedial activities were in progress at the site. Each of the eight (8) monitoring stations was outfitted with the following types of instrumentation: a GT-640A (now Met One) particulate monitor fitted with a PM10 inlet impactor for monitoring of particulate matter < 10u in aerodynamic diameter, a TECO 580 EZ PID monitor for the measurement of Total Volatile Organics (TVOC) as PID ionizable organics, a Baseline 1030 GC/PID for monitoring of BTEX, a canister sampling system for the collection of integrated volatile organic samples for analyses employing EPA Method TO-14 and a General Metal Works High-Volume air sampler for the collection of integrated air samples for eventual PAHs analyses employing EPA Method TO-13A. During the term of the approximately 192 day program more than 197,500 PM10 and TVOC data points were collected. All data were collected as 1 minute averages and compiled as 5 minute composite averages for reporting purposes. All data points were collected as raw averages and reported on a background corrected basis. This presentation will examine the particulate data collected during the Dover MGP Site remediation. Particular attention will be focused on causative agents for the small number (approximately fifty (50)) 5 minute averages (0.025% of the 197,500 PM10 data population) that exceeded the predetermined action level of 150 ug/M3. Both on and off-site specific conditions unrelated to actual remediation activities primarily responsible for the majority of these exceedences will be presented and discussed. EPA Method TO-13A was employed for the collection of integrated or time-weighted composite samples in those instances when the PM10 background corrected concentration exceeded the 150 ug/M3 action level at any of the stations for three (3) consecutive five (5) minute intervals. It should be noted that there was not a single instance during the 192 day monitoring program whereby a TO-13A sample was triggered for collection on the basis of the PM10 exceedance criteria. Samples were collected, however, on a biweekly basis at a subset of the eight stations to augment the background or baseline data base which began prior to the active remedial activities. The results of this approximate 60 sample database will be summarized and presented. The latter will include quality control data specific to the PAHs measurements such as precision data representative of the combined sample collection and analyses scheme as determined through use of collocated field samples. Lastly, this presentation will examine “lessons learned” from the Dover perimeter monitoring program and in particular what does the program data tell us about what constitutes practical monitoring for cost-effective remediation of MGP sites in the future.