2008 Site Environmental Report for Pantex Plant

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2008 Site Environmental Report for Pantex Plant Temperature (F) Rainfall (inches) 90 80 70 60 50 40 30 20 5 4 3 2 1 0 Pantex Monthly Rainfall Amarillo NWS Monthly Temperature Range JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Month in 2008 FIGURE 1.4 ⎯ Pantex Plant Monthly Temperature Range and Amarillo National Weather Service (NWS) Precipitation during 2008 1.5 Geology The primary surface deposits at Pantex Plant are the Pullman and Randall soil series, which grade downward to the Blackwater Draw Formation. This formation consists of about 15 meters (50 feet) of interbedded silty clays, with caliche, and very fine sands, with caliche. Underlying the Blackwater Draw Formation, the Ogallala Formation consists of interbedded sands, silts, clays, and gravels. The base of the Ogallala Formation is an irregular surface that represents the pre- Ogallala topography. As a result, depths to the base of the Ogallala vary. At Pantex Plant, the vertical distance to the base of the Ogallala varies from 90 meters (300 feet) at the southwest corner to 220 meters (720 feet) at the northeast corner of the Plant. (Purtymun and Becker, 1982) Underlying the Ogallala Formation is sedimentary rock of the Dockum Group, consisting of shale, clayey siltstone, and sandstone. A detailed discussion of rocks older than Triassic age, as well as the regional structural setting, is provided in Chapter 3 of the Environmental Information Document (EID) (Pantex Plant, 1998). The deep geology (1,200 meters or 4,000 feet) below the Plant has a major influence on the 1-10
1-11 Introduction natural radiation environment, because radon is released from the granitic rocks there. (See Section 4.3.3 of this document for more information concerning natural radiation.) 1.6 Hydrology The principal surface water feature on the Southern High Plains is the Canadian River, which flows southwest to northeast approximately 27 kilometers (17 miles) north of the Plant. Plant surface waters do not drain into this system, but for the most part discharge into onsite playas. Storm water from agricultural areas at the periphery of the Plant drains into offsite playas. From the various playas, water either evaporates or infiltrates the soil. Two principal subsurface water-bearing units exist beneath Pantex Plant and adjacent areas: the Ogallala Aquifer and the underlying Dockum Group Aquifer. The vadose, or unsaturated, zone above the Ogallala Aquifer consists of as much as 140 meters (460 feet) of sediment that lies between the land surface and the Ogallala Aquifer. 1.6.1 Ogallala Aquifer The water-bearing units within the Ogallala Formation beneath Pantex Plant are the perched aquifer in the vadose zone and the Ogallala Aquifer below. A discontinuous perched aquifer is present above the main zone of saturation. Perched aquifers form above clayey layers that have lower permeability. Data collected from wells at Pantex Plant indicate that the zone of saturation in the perched aquifer varies in thickness by as much as 15-25 meters (~70 feet). Depths from the surface to the perched aquifer range from 64 to 85 meters (209 to 280 feet). The main Ogallala Aquifer lies beneath the perched water zones. Depth to the main Ogallala Aquifer ranges from 102 to 168 meters (~325 to 500 feet) below ground surface. The saturated thickness varies from 12 to 98 meters (~39 to ~400 feet; Panhandle Ground Water Conservation District [PGWCD], 1980). The aquifer is defined as the basal water-saturated portion of the Ogallala Formation and is a principal water supply on the High Plains. The regional gradient of the Ogallala Aquifer beneath Pantex Plant trends from the southwest to the northeast, where the zone of saturation is thickest. The Plant's production wells are located in this northeast area. The City of Amarillo's Carson County Well Field is located north and northeast of Pantex Plant's well field. 1.6.2 Dockum Group Aquifer The Dockum Group Aquifer lies under the Ogallala Formation at Pantex Plant. Water contained in sandstone layers within the Dockum Group supplies domestic and livestock wells south and southeast of Pantex Plant. Other wells reaching the Dockum Group Aquifer are located 16 kilometers (10 miles) south and west of the Plant. The aquifer may be semiconfined with respect to the overlying Ogallala Aquifer because of lateral variations in the Ogallala and shale layers within the Dockum Group. 1.6.3 Water Use The major surface water source near Pantex Plant is the Canadian River, which flows into man-made Lake Meredith approximately 40 kilometers (25 miles) north of the Plant. Many local communities use water from Lake Meredith for domestic purposes. The major groundwater source in the vicinity of the Plant is the Ogallala Aquifer, which is used as a domestic source by numerous municipalities, and by industries in the High Plains. Historical groundwater withdrawals, and long-term pumping from the Ogallala in Carson County and the surrounding eight-county area, have exceeded the natural recharge rate to the Ogallala.
Page 1 and 2: 2008 Site Environmental Report for
Page 3 and 4: 2008 Site Environmental Report for
Page 5 and 6: Help Us Make This Site Environmenta
Page 7 and 8: i Contents FIGURES ................
Page 9 and 10: iii Contents 5.3.3 Data Interpretat
Page 11 and 12: FIGURES v Contents 1.1 Pantex Plant
Page 13 and 14: TABLES vii Contents 1.1 Pantex 2008
Page 15 and 16: aCi attocurie Ag silver As arsenic
Page 17 and 18: ARPA Archaeological Resource Protec
Page 19 and 20: Activity - The rate of disintegrati
Page 21 and 22: Derived Concentration Guide - The c
Page 23 and 24: Historic - Of, relating to, or exis
Page 25 and 26: Plague - An acute infection caused
Page 27 and 28: Slug test - An aquifer test made ei
Page 29 and 30: xxiii Acknowledgements This report
Page 31 and 32: xxv Executive Summary The U.S. Depa
Page 33 and 34: xxvii Executive Summary in complian
Page 35 and 36: xxix Executive Summary Please compl
Page 37 and 38: Introduction The Pantex Plant site,
Page 39 and 40: 1-3 Introduction The employees of B
Page 41 and 42: 1-5 Introduction The drinking water
Page 43 and 44: Introduction Table 1.1 is a compila
Page 45: NORTH 20% 16% 12% 8% 4% WEST EAST S
Page 49 and 50: FIGURE 1.5 — Population Distribut
Page 51 and 52: Compliance Issues and Activities Pa
Page 53 and 54: Regulatory Description Authority ME
Page 55 and 56: 2-5 Compliance Issues and Activitie
Page 57 and 58: TABLE 2.2 C Tracked Emission Source
Page 59 and 60: 2-9 Compliance Issues and Activitie
Page 61 and 62: 2-11 Compliance Issues and Activiti
Page 63 and 64: TABLE 2.5 ⎯ Permits Issued to Pan
Page 65 and 66: 2-15 Compliance Issues and Activiti
Page 67 and 68: Waste Type Non-hazardous Waste Sani
Page 69 and 70: 2.12 Toxic Substances Control Act 2
Page 71 and 72: Environmental Management Informatio
Page 73 and 74: and the environment • Cultural, h
Page 75 and 76: 3-5 Environmental Management Inform
Page 77 and 78: Gallons 90000 80000 70000 60000 500
Page 79 and 80: Environmental Management Informatio
Page 81 and 82: 3-11 Environmental Management Infor
Page 91 and 92: 3.6 Educational Resources and Outre
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3-27 Environmental Management Infor
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Environmental Radiological Monitori
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4-5 Environmental Radiological Moni
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4.3.3. Dose Comparisons Environment
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TABLE 4.5 ⎯ Environmental Doses M
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5-1 Air Monitoring Radiological amb
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5-3 Air Monitoring Seventeen radiol
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Location TABLE 5.1 ⎯ 2008 Schedul
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5-7 Air Monitoring Any tritiated wa
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Pantex operations. 5-9 Air Monitori
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Groundwater Monitoring and Plume Ma
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6-3 Groundwater Monitoring and Plum
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Analyte # Samples # Detections 6-11
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6-13 Groundwater Monitoring and Plu
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6-15 Groundwater Monitoring and Plu
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7-1 Drinking Water By regulation, B
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TABLE 7.1 — Drinking Water and Pr
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7.5.4 Biological Monitoring (30 TAC
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Substance or Contaminant Radionucli
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Wastewater B&W Pantex owns and oper
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8-3 Wastewater Control (UIC) author
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Analyte TABLE 8.2 — Water Quality
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Surface Water Analytical data obtai
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9-3 Surface Water Industrial efflue
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Storm Water from Zone 4, Zone 11 Ea
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Outfall STORM01 9.2.1 Playa 1 Basin
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9-9 Surface Water Permit-required m
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9-11 Surface Water Permit-required
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10-1 Soil Onsite soil monitoring re
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silver were well below their respec
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11-1 Fauna Radionuclide concentrati
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Location Tritium Zone 4 Zone 12 Sou
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12-1 Flora Radionuclide concentrati
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FIGURE 12.2 ⎯ Offsite Vegetation
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12-5 Flora and 238 U in wheat and g
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Quality Assurance Quality is an int
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13-3 Quality Assurance • Sample o
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Duplicate and Replicate Analyses 13
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Percent Useable 125 100 75 50 25 95
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Appendix A Analytes Monitored in 20
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Analytes Monitored in 2008 A-3 Anal
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Analyte Chloride Chlorine residual
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Analyte Benzyl alcohol bis(2-chloro
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Analyte Necropsy Total coliform bac
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APPENDIX B Birds Identified at Pant
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Appendix C References Brady, Ray. W
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C-3 References prairie rattlesnakes
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C-5 References Seyffert, K.D. Check
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Multiple 1 H 10 3 1 H 10 -2 1 H 10
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2008 Site Environmental Report for Pantex Plant

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