SWMU B-20/21 RL33 Rework Work Plan

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RL33 Work Plan Amendment for Data Quality Rework at SWMUs B-20 and B-21

May 2000

Soils: Crawford and Bexar stony soils, Krum Complex, and Brackett-Tarrant association

Known/Previous Investigations: Results of previous investigations at the B-20 former open burn/open detonation (OB/OD) are summarized in the RL33 Work Plan Addendum.

In 1994 and 1995, a number of surface soil, subsurface soil, sediment, surface water and groundwater samples were collected at the B-20 site, as shown in Figure B20/21-1. Analyses were conducted by Terra Laboratory, with the exception of explosives analyses, which were conducted by ITS Laboratory. Surface clearance of UXO of the entire B-20 site was also initiated during this period.

A total of 13 soil borings have been drilled and sampled at the B-20 site. SB1 through SB10 were part of the initial investigation of the site. SB11, SB12, and SB13 were drilled adjacent to SB10, SB9, and SB2, respectively for collection of samples for synthetic precipitation leaching procedure (SPLP) and toxicity characteristic leaching metals (TCLP) metals.

Subsurface clearance of UXO at the B-20 site was initiated in the spring of 1997. Subsurface clearing was accomplished on approximately 6 acres of soil located in the northern portion of SWMU B-20. These soils were removed and sifted to recover UXO and metal fragments within the soil matrix. Approximately 2,500 cubic yards of sifted soils are currently in piles within the B-20 site. Samples were collected from the soil piles and analyzed for lead by ITS Laboratory. During this period, perimeter areas to the north and south of the site were also surface-cleared of UXO.

In addition, five soil mounds in the eastern part of the site were leveled and each of the thirteen craters scattered throughout the site were filled in with surrounding soils. A majority of the site, with the exception of the northeast corner and the eastern edge of the site was graded, and the site was seeded to prevent soil erosion.

In July 1999, approximately 100 cubic yards of spent small arms ammunition and soil contaminated with lead from SWMUs B-20 and B-21 were removed and disposed as a hazardous waste at the Texas Ecology Landfill located in Robstown, TX. The small ammunition disposal areas, which were removed, are denoted in Figure B20/21-1.

Planned Rework: Replace selected previous analytical chemistry data generated by ITS Laboratory. Because surface soils at the site have been moved, sifted, and graded since the time when surface soil samples were collected and analyzed by ITS, Parsons ES proposes that the rework sampling be focused on the soil boring analytical data. ITS provided explosives analytical chemistry data generated in 1994 under a separate delivery order. Terra Laboratory provided metals chemistry analytical data for these soil borings. To replace analytical chemistry data from ITS, Parsons ES proposes to resample eight soil borings located as close as possible to the original soil borings to gather soil samples for explosives analyses. These borings will be named RW-B20-SB1 through RW-B20-SB8. Three samples from each boring (surface, middle and total boring depth) will be analyzed for explosives. Parsons ES proposes no additional sampling efforts for the borings within the northern portion where soils have been sifted, soil borings B20-SB9 through B20-SB12. Additionally, because B20-SB13 is located in the same position as B20-SB2, Parsons ES proposes not to resample B20-SB13.

ITS has also provided lead data for the approximately 2,500 cubic yards of sifted soil located in the northern portion of B-20. Parsons ES proposes to collect five composite soil samples from the sifted soil piles and analyze them for explosives and lead. Explosives will be analyzed for because ITS conducted explosives analysis of surface soils. The sifted soil consists primarily of surface soil from the northern portion of the site. These samples will also be analyzed for lead because lead was the metal most often detected at elevated concentrations in surface soil. The purpose of these sifted soil samples was to provide data for determining potential disposal or remediation options for the soil. Since lead was the metal detected at the highest concentrations, it is viewed as the most difficult to remediate.

Rationale for Analytical Program: Based on prior usage at the site for ordnance OB/OD activities (B-20) and a disposal area for sand and spend ammunition (B-21), chemicals of potential concern include metals and explosives. Based on previous investigations, lead analysis only is included in the sampling. Ammunition may include explosives residue therefore, an analysis for explosives will be conducted. VOCs analysis is not included in the analytical program. SVOCs are not included at this site since due to the type of items disposed of.

Resampling Activities: The following field activities will be performed to gather data for TNRCC closure submittal of SWMU B-20:

The boring logs from the original drilling of SB1 through SB10 will be copied and reviewed by the supervising geologist prior to beginning any rework at SWMU
B-20. In particular, the geologist will review the PID readings and recovery volumes obtained from the existing boring.

Field locate previous soil boring locations (drilled in 1994).

Complete ten soil borings in the approximate locations of the first set of soil borings, completed in 1994. Boring locations are shown in Figure B20/21-1. The rework soil samples will be collected from each boring from the same depth intervals as the first set of surface and subsurface soil samples. The total depth of each boring will be at approximately the same depth as the first set of soil borings (SB1 = 16 feet, SB2 = 15 feet, SB3 = 21 feet, SB4 = 21 feet, SB5 = 20 feet, SB6 = 16 feet, SB7 = 21 feet, and SB8 = 21). Each rework sample will be analyzed for explosives, as indicated in the table below. Additionally, collection of five composite soil samples from the sifted soil piles will be accomplished. Each composite soil sample will be analyzed for explosives and metals. QA/QC samples will be collected as described in Section 2.4 of the FSP.

Boring logs for the rework soil borings will not be completed. Instead, the original boring logs created from the boring completed in 1994 will be available onsite during rework activities. Changes to the boring logs will be made if field personnel observe a difference in the rework boring from the original soil boring.

Water is not expected to be encountered in the borings at the site. However, if water is discovered in any of the soil borings, AFCEE and CSSA will be notified immediately. Completion of monitoring wells is not included in the scope of the rework as no wells were previously installed at the site.

Handle IDW as specified in the FSP.

Analytical results of the B-20 sifted soil material, along with additional analytical chemistry data generated under a separate delivery order, will be used to determine potential treatment and disposal options as described in the RL83 amendment. QA/QC samples will be collected as described in Section 2.4 of the FSP.

Historical Analytical Program and Rework Sampling Plan (highlighted in bold)
SWMU B-20

Sample ID	Sample Matrix	Sample Depths (ft)	Laboratory	Original Sample date	VOCs SW8240	SVOCs SW8270	Explosives SW8330	Metals* SW6010/ SW7000	Comment
B20-SB1	Soil	5, 16	ITS/ Terra	12/8/94			X	X	Original sample location.
B20-SB1	Groundwater	10.5	ITS/Terra	12/14/94			X	X	Original sample location.
*RW-B20-SB1*	Soil	*5, 16*	*Data Chem*	*TBD*			X		*Will be drilled adjacent to SB1.*
*RW-B20-SB1*	*Groundwater*	NA	*Data Chem*	*TBD*			X		*Will be collected if groundwater is encountered.*
B20-SB2	Soil	5, 15	ITS/ Terra	12/8/94			X	X	Original sample location.
*RW-B20-SB2*	Soil	*5, 15*	*Data Chem*	*TBD*			X		*Will be drilled adjacent to SB2.*
B20-SB3	Soil	15.6, 21.3	ITS/ Terra	12/9/94			X	X	Original sample location.
*RW-B20-SB3*	Soil	*15.6, 21.3*	*Data Chem*	*TBD*			X		*Will be drilled adjacent to SB3.*
B20-SB4	Soil	16.5, 21	ITS/ Terra	12/9/94			X	X	Original sample location.
*RW-B20-SB4*	Soil	*16.5, 21*	*Data Chem*	*TBD*			X		*Will be drilled adjacent to SB4.*
B20-SB5	Soil	15, 20	ITS/ Terra	12/8/94			X	X	Original sample location.
*RW-B20-SB5*	Soil	*15, 20*	*Data Chem*	*TBD*			X		*Will be drilled adjacent to SB5.*
B20-SB6	Soil	10.5, 16	ITS/ Terra	12/12/94			X	X	Original sample location.
*RW-B20-SB6*	Soil	*10.5, 16*	*Data Chem*	*TBD*			X		*Will be drilled adjacent to SB6.*
B20-SB7	Soil	16.8, 20.8	ITS/ Terra	12/12/94			X	X	Original sample location.
*RW-B20-SB7*	Soil	*16.8, 20.8*	*Data Chem*	*TBD*			X		*Will be drilled adjacent to SB7.*
B20-SB8	Soil	15.5, 21	ITS/ Terra	12/12/94			X	X	Original sample location.
*RW-B20-SB8*	Soil	*15.5, 21*	*Data Chem*	*TBD*			X		*Will be drilled adjacent to SB8.*
B20-SB9	Soil	4, 14.7	ITS/ Terra	12/13/94			X	X	Original sample location.
B20-SB10	Soil	6, 15.6	ITS/ Terra	12/13/94			X	X	Original sample location.
B20-SB11	Soil	5.4, 15.4	Terra	9/5/95					Original sample location. Analyzed for TCLP and SPLP metals only.
B20-SB12	Soil	4.0, 15.5	Terra	9/5/95					Original sample location. Analyzed for TCLP and SPLP metals only.
B20-SB103	Soil	15.5	Terra	9/5/95					Duplicate of B20-SB12 at 15.5 feet.
B20-SB13	Soil	14, 15.6	Terra	9/6/95					Duplicate of B20-SB12 at 15.6 feet.
B20-SS1	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS2	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS3	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS4	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS5	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS6	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS7	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS8	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS9	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS10	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS11	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS12	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS13	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS14	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS15	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS16	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS17	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS18	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS19	Soil	0.5	ITS	12/14/94			X		Original sample location.
B20-SS20	Soil	0.5	ITS	12/14/94			X		Original sample location.
B20-SS21	Soil	0.5	ITS	12/14/94			X		Original sample location.
B20-SS22	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS23	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS24	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS25	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS26	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS27	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS28	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS29	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS30	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS31	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS32	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS33	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS34	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS35	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS36	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS37	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS38	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS39	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS40	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS41	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS42	Soil	0.5	ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SS43	Soil	0.5	Terra	12/14/94				X	Original sample location.
B20-SS44	Soil	0.4	Terra	9/6/95				X	Original sample location.
B20-SS45	Soil	0.4	Terra	9/6/95				X	Original sample location.
B20-SS46	Soil	0.4	Terra	9/6/95				X	Original sample location.
B20-SS47	Soil	0.4	Terra	9/6/95				X	Original sample location.
B20-SS48	Soil	0.5	Terra	9/6/95				X	Original sample location.
B20-SS49	Soil	0.4	Terra	9/6/95				X	Original sample location.
B20-SS50	Soil	0.5	Terra	9/6/95				X	Original sample location.
B20-SS51	Soil	0.5	Terra	9/6/95				X	Original sample location.
B20-SS52	Soil	0.3	Terra	9/6/95				X	Original sample location.
B20-SS53	Soil	0.3	Terra	9/6/95				X	Original sample location.
B20-SS103	Soil	0.3	Terra	9/6/95				X	Duplicate of B20-SS53 at 0.3 feet.
B20-SS54	Soil	0.3	Terra	9/6/95				X	Original sample location.
B20-SS55	Soil	0.4	Terra	9/6/95				X	Original sample location.
B20-SS56	Soil	0.3	Terra	9/6/95				X	Original sample location.
B20-SS104	Soil	0.4	Terra	9/6/95				X	Duplicate of B20-SS57 at 0.4 feet.
B20-SS57	Soil	0.4	Terra	9/6/95				X	Original sample location.
B20-SS58	Soil	0.4	Terra	9/6/95				X	Original sample location.
B20-SS59	Soil	0.5	Terra	9/6/95				X	Original sample location.
B20-SW1	Water		Terra	12/14/94				X	Original sample location.
B20-SW2	Water		Terra	12/14/94				X	Original sample location.
B20-SW3	Water		ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SW4	Water		ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SW5	Water		ITS/ Terra	12/14/94			X	X	Original sample location.
B20-SE1	Sediment		Terra	12/14/94	X	X		X	Original sample location.
B20-SE2	Sediment		Terra	12/14/94	X	X		X	Original sample location.
B20-SE3	Sediment		Terra	12/14/94	X	X		X	Original sample location.
B20-SE4	NA	NA	NA	NA	NA	NA	NA	NA	Sample not collected.
B20-SE5	Sediment		ITS/Terra	12/14/94	X	X	X	X	Original sample location.
B20-SE6	Sediment		ITS/Terra	12/14/94	X	X	X	X	Original sample location.
B20-SE7	Sediment		ITS/Terra	12/14/94	X	X	X	X	Original sample location.
B20-SE8	Sediment		ITS/Terra	12/14/94	X	X	X	X	Original sample location.
B20-SE9	Sediment		ITS/Terra	12/14/94	X	X	X	X	Original sample location.
B20-SSP1	Composite		ITS	7/97			X	X	Original sample location.
B20-EX1	Soil	0.5	ITS						Original sample location . Analyzed for TCLP Lead only.
B20-Pit 3	Soil	0.5	ITS					Lead only	Original sample location.
B20-Sift 1	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 1.
B20-Sift 2	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 2.
B20-Sift 3	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 3.
B20-Sift 4	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 4.
B20-Sift1A	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 1.
B20-Sift1B	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 1.
B20-Sift1C	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 1.
B20-Sift1D	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 1.
B20-Sift2A	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 2.
B20-Sift2B	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 2.
B20-Sift2C	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 2.
B20-Sift3A	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 3.
B20-Sift3B	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 3.
B20-Sift3C	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 3.
B20-Sift3D	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 3.
B20-Sift4A	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 4.
B20-Sift4B	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 4.
B20-Sift4C	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 4.
B20-Sift5A	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 5.
B20-Sift5B	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 5.
B20-Sift5C	Soil	0.5	ITS					Lead only	Composite soil sample collected from Mound 5.

* Analytical methods (EPA SW-846) for metals: arsenic SW7062; mercury SW7471; barium, cadmium, and chromium SW6010; lead SW6010 or SW7420.

Note: ITS Laboratories performed all explosive analyses and Terra Laboratories Ltd. performed all metal analyses from 1994 through 1996. ITS Laboratories provided all analytical data during the 1997 UXO removal efforts.