ML20207E724
| ML20207E724 | |
| Person / Time | |
|---|---|
| Site: | 07003085 |
| Issue date: | 02/28/1999 |
| From: | AFFILIATION NOT ASSIGNED |
| To: | |
| Shared Package | |
| ML20207E715 | List: |
| References | |
| PROC-990228, NUDOCS 9903110059 | |
| Download: ML20207E724 (16) | |
Text
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PARKS Shallow Land Disposal Area 1999 Field Program Work Plan i
Date issued: February 1999 9903110059 990226 PDR ADOCK 07003085 C
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i TABLE OF CONTENTS 1.0 -
WORK PLAN OVERVIEW 1
1.1 INTRODUCTION
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1.2 BACKGROUND
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l 1.3 ORGANIZATION OF THIS WORK PLAN 1
1.4 POSSIBLE CHANGES TO THIS PLAN 1
2.0 OBJECTIVES 2
3.0 DESCRIPTION
OF THE FIELD ACTIVITIES 3
3.1 TEMPORARY PIEZOMETERS 3
1 3.1.1 Overview 3
3.1.2 Locations 3
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3.1.3 installatior-3 i
3.2 GEOCHEMICAL TESTING 4
4.0 DATA ANALYSIS 6
5.0 HEALTH AND SAFETY PROCEDURES 7
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8 TABLES Table 1 -
Summary of Proposed Piezometer and Staff Gauges Table 2 Proposed Locations for in-situ Eh and pH Measurements I
FIGURES Figure 1 Proposed Locations 4
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1.0 WORK PLAN OVERVIEW
1.1 INTRODUCTION
This is a Work Plan for the 1999 field data collection at the Parks Shallow Land Disposal Area l
(SLDA) in Armstrong County, Pennsylvania.
1.2 BACKGROUND
The field work erTort is to be undertaken to provide data needed for the evaluation of remediation alternatives. The data will be utilized to refine the range of potential groundwater exposure scenarios used to calculate potential future dose.
1.3 ORGANIZATION OF THIS WORK PLAN The tasks presented in the following sections are organized into units based on technique, location, schedule, or logistical considerations.
1.4 POSSIBLE CHANGES TO THIS PLAN Because the actual conditions encountered during the field effort may vary from those anticipated, this Work Plan is intended as a guide for the data collection effort. In addition to specifying the planned approach, this Work Plan provides the data objectives. This will allow the field f,ersonnel to modify the approach so that the objectives are met, even if unanticipated conditions are encountered. All changes or modifications to the program will be documented and contained in the report of results.
All work will be conducted under the control of B&W Services, Inc. (BWSI). All work will be done under BWSI standard operating procedures for technical activities and the Site Health and Safety Plan. All work will be subject to standard BWSI procedures for quality control and quality assurance.
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- 2.0 OBJECTIVES The primary objective for the proposed 1999 data collection effort is to obtain the data needed to perform a fate and transport analysis. The specific information is needed to funher define the groundwater flow paths, hydraulic characteristics, and geochemical conditions downgradient from the upper trenches.
Specific objectives include:
Deterrnining the direction of groundwater flow between Dry Run and the soil zone at various locations along the section north of the upper trenches; Determining the direction of groundwater flow in the first shallow bedrock zone (FSB) below and north of Dry Run; Characterizing the geochemical conditions in the various hydrogeologic units e
downgradient of the upper trenches; and Evaluating the hydraulic conditions in the vicinity of existing well MW-42.
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3.0 DESCRIPTION
OF THE FIELD ACTIVITIES
.1 TEMPORARY PIEZOMETERS
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1 3.1.1 Overview
. A total of eight temporary piezometers (TPZ) are proposed (three in the overburden above the top of bedrock and five in the first shallow bedrock zone) to evaluate the groundwater flow paths. In addition, four staff gauges will be installed in Dry Run adjacent to TPZ locations to evaluate the gro'mdwater flow direction between Dry Run and the adjacent soil zone or bedrock. Table i provides the estimated depth and target zone for each piezometer.
Most zones in the soil and bedrock at the SLDA site have low porosity and low permeability. A large diameter well will lag in responding to hydraulic head changes in the formation due to the storage capacity of the well. Therefore, the TPZ's are intended to be as small in diameter as practical. Six of the TPZ's will be constructed of 1-inch ID porous polyethylene tips and %-inch ID PVC riser pipe. The two TPZ's scheduled for in-situ oxidation / reduction measurements (PZO4 and PZ05) will be constructed of 2-inch 10 PVC screen and riser pipe. Because the TPZ's will be used only for water level and in-situ measurements, a protective steel casing and concrete j
pad will not be required. They will be completed at the surface with grout and a secure cap on the PVC riser. Detailed construction specifications for the piezometers are provided in Section 3
3.1.3.
An experienced geologist will log the cuttings of materials encountered during drilling operations to determine the appropriate depth for completion. Table 1 provides an estimate of the completion depth ar4d screened zone for each piezometer. Because the estimates are believed to be reasonably close to the actual depths, cuttings will be sufficient to determine the completion depth and target zone for each TPZ. It will not be necessary to collect split-spoon or core samples other than those scheduled for geochemical testing (Table 1).
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> ocations The proposed locations for the temporary piezometers and staff gauges are intended to provide the characteiization information necessary to perform fate and transport analysis and are shown on Figure 1. n. !ocations were selected to provide complete coverage of the downgradient groundwater flow paths from the trenches.
3.1.3 installation i
Temporarv Piergpeters The TPZ's installed in the soil zone will be constructed by drilling to the top of bedrock using the hollow stem auger method. The maximum auger size will be 6-inch OD (4.5-inch OD is preferred). The soil piezometers will consist of a 1-foot long piezometer tip and %-inch ID riser pipe. The tip will be set at the bottom of the boring (top of rock) and sand will be placed in the annular space to the top of the target zone elevation specified in Table 1. A 1-foot thick bentonite seal will be placed above the sand and the remaining annular space will be tremie grouted to the surface. A secured vented cap will be placed on the tcp of the riser pipe.
The bedrock TPZ's will be installed by first drilling with augers to the top of bedrock. A steel l
casing will be placed in the auger boring and set into the top of bedrock. The casing will then be 3
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'l tremie grouted in place to isolate gro.ndwater in the soil zone from the bedrock. The bedrock
. will then be drilled using either air-rotary or air-percussion methods to tl e appropriate depth. The boring in rock will be between 4-and 6-inches ID. The projected depths for each TPZ are provided in Table 1. Where specified in Table 1, samples will be obtained for geochemical testing.
Six of the TPZ's will consist of a 1-inch ID by 1.0 orl.5-foot long piezometer tip and %-inch ID PVC riser pipe. The two TPZ's scheduled for in-situ testing (TPZO4 and TPZ05) will be constructed using 2-inch ID by 10 foot long,0.010-inch slotted, PVC screen and a 2-inch ID flush joint PVC riser pipe. The length of the screened section will be adjusted to accommodate the actual depth and thickness of the target formation if different than estimated in Table 1.
Staff Gauaes The statTgauges will consist of % to 1-inch diameter steel rods securely driven into the streambed of Dry Run. Unless bedrock refusal is encountered sooner, the rods will be driven a minimum of two feet into the streambed. if bedrock refusal is encountered, the rods will be d:iven into a pilot hole drilled a minimum of 1 foot into the bedrock.
I The location and elevations of each piezometer top of casing, ground surface and top of staff gauge will be surveyed to +/- I foot for location and to +/- 0.01 foot for elevations.
j 3.2 GEOCHEMICAL TESTING I
Geochemical testing will focus on the condition: downgradient of the upper trenches. The program will include the following activities:
Collection of samples of soil and weathered bedrock for use in batch sorption experiments
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Collection of water samples for use in sorption experiments i
e Measurement ofin-situ pH and Eh in downgradient welb and piezometers j
e Batch sorption experiments to obtain sorption coefficients for uranium e
Calculations to obtain representative sorption coefficient values The collection of soils, weathered bedrock and waters will be governed by existing BWSI procedures. The measurement ofin-situ pH and Eh will follow standard procedures for pH and Eh measurement. The batch sorption experiments will be performed using a standard ASTM procedure.
The solid samples to be used in the batch experiments will be chosen from soil and weathered bedrock materials recovered from piezometers located downgradient of the trenches. The wells and piezometers from which samples may be obtained are specified in Table I and the respective locations are shown on Figure 1. Soil samples will be collected from the auger borings used to install the soil piezometers. Particular emphasis will be placed on obtaining samples from the bottom of soil / top of bedrock transition zone. Previous efforts obtained soil samples by using a l
split spoon above the depth of auger refusal anti core samples of bedrock below that depth. The transition zone consisted of bedrock fragments mixed with clayey soil derived from weathering of the bedrock. The coring process washed away the soil materials resulting in samples consisting of only the bedrock fragments. During the 1999 field program, every effort will be made to obtain split-spoon samples of the interface. This will allow accurate measurement of the distribution coefficient (Kd) of this zone. Samples of competent bedrock (middle of the 1
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1 wrathered bedrock zone and first shallow bedrock zone) specified in Table I will be collected by obtaining a 1-foot long core section during the drilling operation.
In-situ measurements of pH and Eh will be made in TPZO4 and i PZ05 and selected existing wells. The existing wells proposed for in-situ measurements are listed in Table 2. These measurements are intended to characterize the water composition downgradient of the trenches in tenns of parameters that are important to uranium mobility. Water samples for sorption tests will be obtained from the TPZ's and existing wells used for in-situ measurements.
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g 4.0 DATA ANALYSIS The hydrologic data will be used to evaluate the downgradient groundwater flow paths from various locations with'n the trenches. The groundwater flow velocity, groundwater flow volume and distance traveled + ?.1 be calculated and used to develop a conceptual model of groundwater flow. The resulting fk v model will be used along with the data on geochemical conditions to calculate the potential utes of migration of uranium. The results of the calculations will be used to evaluate the relative,erformance of the various options being considered.
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5.0 HEALTH AND SAFETY PROCEDURES l
Applicable BWSI standard operating procedures, including health and safety procedures,
- prepared for previous site characterization efforts will be followed throughout the 1999 field l
program.
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6 TABLES i
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TABLE 2 PROPOSED LOCATIONS FOR IN-SITU Eh and pH MEASUREMENTS f
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LOCATION ID FORMATION EXISTING MW11-D 2nd Shallow Bedrock MW-11S Soil MW-12D 1st Shallow Bedrock MW-17 2nd Shallow Bedrock MW-25 1st Shallow Bedrock MW-26 1st Shallow Bqdrock MW-27 1st Shallow t>g iock MW-28 1st Shale MW-41 1st Shallow Bedrock MW-42 1st Shallow Bedrock PZ-01 Soll/ Weathered bedrock PZ-02 Soil / Weathered bedrock PZ-03A Soil / Weathered bedrock NEW TPZ's TPZO4 1st Shallow Bedrock TPZ05 1st Shallow Bedrock
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FIGURE 1 PROPOSED I
LOCATIONS we ARCO SLDA 2s 1998 Fi.id Work Pl.n ws SS =
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