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Highlights of the FINAL PROPOSED PLAN for Sites 61 and 104 (PICA 102) - continued
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Robinson Run are provided on page 4: “GPB is located adjacent to Sites 61 and 104 (PICA 102) and flows to the southwest. GPB forks into two branches just north of Site 61 and rejoins as one segment just south of Site 104. The stretch of the brook closest to Sites 61 and 104 (PICA 102) is approximately 15 feet wide and 2 to 3 feet deep. The brook eventually discharges to the Rockaway River, approximately one mile southeast of the Picatinny boundary. Robinson Run flows northwest from the unnamed ridge in Area L and cuts through the southern end of Area F at Site 61 where it eventually drains into GPB. The western edge of Area F, along GPB, is low-lying and swampy. Robinson Run is approximately 3 feet wide and 2 feet deep in the area of Site 61”. The proposed plan refers to the presence of semi-volatile organic compounds (SVOCs) in surface soil on page 6: “SVOCs A total of six SVOCs were identified at levels exceeding LOCs in surface soil samples collected at Site 61. Two SVOCs were identified at levels exceeding the LOCs in Site 104 surface soil. The SVOCs detected at Site 61 included the polynuclear aromatic hydrocarbons (PAHs) benz(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene, benzo(k)fluoranthene, dibenz(a,h)anthracene, and indeno(1,2,3-c,d)pyrene… The SVOCs detected at Site 104 included the PAHs benz(a)anthracene and benzo(b)fluoranthene”. The detection of metals is referred to in the following statements on page 6 : |
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“TAL Metals Arsenic, beryllium, and thallium were identified at Sites 61 and 104 (PICA 102) at levels in excess of LOCs. The highest concentrations of arsenic ranged from 23.8 mg/kg at Site 104 to 83.0 mg/kg at Site 61. These were the only arsenic exceedances identified at Sites 61 and 104 (PICA 102). The highest beryllium concentration at Site 61 was observed at sample location SS61-1A (6.52 mg/kg); at Site 104 the highest concentration was at sample location SS104-4A (4.65 mg/kg). Thallium concentrations ranged from 0.0340 mg/kg to 131 mg/kg at Site 61 sample location TP61-3c and from 0.0440 mg/kg to 181 mg/kg at Site 104 sample location SS104-1A. Copper, lead, mercury, and zinc were detected at Site 104 at levels in excess of LOCs. Mercury was detected at the maximum concentration of 2,700 mg/kg in sample SS104-3A. However, this concentration is considered to be an anomaly, as the result could not be duplicated through additional sampling and analysis of an additional eight surface soil samples from this same location. The maximum concentration of mercury detected in the additional eight samples was 2.68 mg/kg. Copper concentrations ranged from 13.7 mg/kg to 2,900 mg/kg. The only LOC exceedances for cooper were identified in samples SD104-2 (2,900 mg/kg) and 104SD-6 (849 mg/kg). Lead concentrations ranged from 32 mg/kg to 3,100 mg/kg. The only LOC exceedances for lead were identified in samples SD104-2 (3,100 mg/kg) and 104SD-6 (647 mg/kg). Zinc concentrations ranged from 55.7 mg/kg to 4,700 mg/kg in Site 104 surface soil samples. The only LOC exceedance for zinc was identified in sample SS104-2A (4,700 mg/kg)”. |
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On page 7 the report elaborates further on the presence of arsenic and thallium : “TAL Metals Arsenic and thallium were identified at Site 61 at levels exceeding LOCs in subsurface soil. No metals were identified at levels exceeding the LOCs in Site 104 subsurface soil. The highest detected concentration of arsenic was 23.9 mg/kg (LOC = 20 mg/kg) in sample TP61-1C. This was the only sample in which arsenic concentrations exceeded the LOCs. Thallium concentrations ranged from 0.0380 mg/kg to 470 mg/kg. Only two samples (TP61-3D and TP61-2D) had exceedances for this metal”. PCBs were detected and discussed accordingly on page 8 as per the following: “PCB The PCB compounds Aroclor 1016 and Aroclor 1260 were identified at levels exceeding the LOC in surface water sample 104SW-5, which was collected from the area of GPB adjacent to Site 104. Aroclor 1016 was identified at a concentration of 0.320 ug/L and Aroclor 1260 was detected at a level of 0.274ug/L. The LOC for both PCB compounds is 0.000064 ug/L”. Explosive compounds were detected and discussed on page 8 : “Explosives One of five explosive compounds detected in surface water was identified at a concentration exceeding the LOC. Cyclotrimethylenetrinitramine or RDX, which was identified in two surface water samples, was detected at its highest concentration (3.06 ug/l) in sample SWGP-7”. Groundwater contamination was |
