Quarterly Environmental Radiological Survey Summary Fourth Quarter 2002 100 200 300 and 600 Areas [report]

S M MCKINNEY
2003 unpublished
EXECUTIVE SUMMARY This report provides a summary of the radiological surveys performed in support of the near-facility environmental monitoring program at the Hanford Site. The Fourth Quarter 1996 survey results and the status of actions required from current and past reports are summarized below: rn Of the routine environmental radiological surveys scheduled during October, November, and December 1996, five were unable to be performed due to conetructionjremediation activities in the areas to
more » ... e surveyed. Ninety four environmental radiological surveys were performed during the fourth quarter 1996, 38 at the active waste sites and 56 at the inactive waste sites. Contamination above background levels was found at four of the active waste sites and five of the inactive waste sites. Contamination levels as high as 150,000 disintegrations per minute (dpm) were reported. Of these contaminated surveys seven were in Underground Radioactive Material (URPI) areas and two were in contamination areas. The contamination found within five of the URM areas was immediately cleaned up and no further action was required. were posted and will require decontamination. Problem Reports (RPR's) were issued and the sites were turned over to the landlord for further action if required. In the remaining two sites the areas Radiological D During 1996, 20.6 hectares (50.9 acres) were stabilized and radiologically down posted from Contamination Area (CA)/Soil Contamination (SC) to URM. The area near the 241-ER-152 Diversion Box southwest of B Plant was the focus of radiological contamination. The ground surface, contaminated by animaljinsect intrusion (figure ll), was stabilized by the placement of clean gravel fill on top of the contamination and the area was down posted from CAjSC to URM, 0 . 5 hectares (1.2 acres). m An area northwest of the 216-A-25 pond overflow was identified from the airborne radiological survey conducted by Bechtel Nevada. This new area covers 0.8 hectares (1.9 acres). The BC control Area (UN-216-E-11) was significantly enlarged to a size of approximately 3,849 hectares (9,511 acres). During the investigative radiological survey scheduled specifically for boundary definition of the BC Control Area contamination was located outside the original posted BC Control Area. The survey was continued over open land directly south of the 200 East area. Eight areas of contamination with levels up to 20,000 dpm betajgamma were identified. i
doi:10.2172/810113 fatcat:jrhlumysfraozo5riiqhi3wjwq