• . ,- . • ES 2901 NORTH IN'T'ERREGIONAL

AUSTIN. TEX.I.S 78722

ENGINEERING-SCIENCE, INC. (512) 417.990 1

,, ' ..... , .

03 November 1987

John ~!eyer (6H-EC) Superfund Compliance Section Bailey Waste Disposal Site U.S. Environ1:1-'!ntal Protection Agency Region VI 1445 Ross Avenue Dallas, TX 75202-2733

Dear ~1r. \ley~r:

On 17 September 1987, Engineering-Science, field work, "n behalf of the Bailey Task Force, disposal site. The EPA-approved work plans were activities.

Inc. (ES) completed at the Bailey waste implemented for these

Due to field conditions. modifications to the waste characterization work plan wese necessary. These changes, which were approved by you, enhanced the •ample collection procedures. The changes were:

Borehole cuttings were collected when waste samples were too wet and/ or ,,ily to collect with a Shelby tube or split-spoon sampler. This method was appropriate since the waste was difficult to handle, and it was important to chara_cterize all types of waste for treatment and/or disposal.

Son:e boreholes were sampled with Shelby tubes without the use of hollow-stiim augers. These procedures were used when the waste was "stiff" snd the borehole walls were stable. The quantity of downhole equip mer: t was reduced, as was the decontamination time.

Al one 9ampling location, a flight of auger and a b:t were grossly contaminated with waste, tar, and barbed wire. The auger and bit were placed back into the borehole and grouted in place and the boring location cleat•ly marked.

Laboratory t<'!sting will fication protoccl outlined However, some modifications as described below.

AU057 .03/CBA.22

A 5UBSIOIARV OF THE P.A.ftSONS CCAPORATION

be performed in accordance with the solidi­in the waste characterization work plan. and changes to the protocol will be req•1ired,

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ENGINEERING-SCIENCE, •.

John Meyer 03 November 1987 Page 2

• Solidification and testing oi the ran waste material will be

performed at Disposal Systems, lnc. (OSI) in Deer Park, Texas. A pro­posed schedule for the solidification testing is enclosed. Southwestern Laboratories (SWL) will maintain this schedule as closely as possible; however, adjustments may be required as the testing progresses.

TEST METHODS

The tests will be conducted in accordance with the EPA and ASTM procedure., specified in the solidification protocol, with three excep­tions.

The two ASTM procedures specified for bulk density (D2922 and D2937) are applicable for field determination of density, There is no current ASTM procedure for laboratory determination of bulk density, However, the bulk density of the composited raw samples and the solidified waste with the optimum quantity of admix will be computed based on the volume determined by ASTM D297B (volume of processed peat materials), For this procedure, a cylindl'ical, 0,5-cubic-foot container will be used in lieu of a square container, Use of 4 cylindrical container will minim;ze the difficulties with complete filling that occur with a square con ta-~ner.

Unconfined compression tests v.·i.U be performed in accordance with ASTM D1633 as '3pecified; however, the test3 will be performed according t'l method B rather than method A. The difforence in these methods is the :sample diameter (2 ,8 inches for method A, and 4 ,0 inches for method B). The method specified for sample preparation (AS fM 01632) produces a sample diameter of 2 ,8 inches, The smaller diameter is also required for compression test equipment.

It may also be necessary to cha'lge the method specified for the wet/dry test ( ASTM 0559) from method B to method A, Method A is used ivhen 100 percent of the soil passes the No. 4 sieve, and method B i.s used when the &oil passes a 3/4-inch ~ieve and a portion is retained on the No, 4 sieve, Once the soil is composited, it is anticipated that all of the material will pass the No, 4 sieve,

SAMPLE PREPARATION

In addition to the moisture/densitf relation tests ( AST'.d D558) specified in the solidification protocol (at the optimum quantity of cement and fly ash), moisture/density tests will also be required for the waste, both raw and at a selected quantity of admix, These additional tests are needed to determine a density at which t;; mold the unconfined compressio,1 test samples for both the !'aw waste and the initial samples with 5, 10, 21), 30, and 50 percent admix, The later samples will be

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John ~!eyer 03 November 1337 Page 3

• molded to approximately l5 percent of the maximum density determined for an admix content of 30 percent.

SAMPLE CURING

I~ will not be pos;ible to moist cure the initial compression test samples ( with 5, 10, 20, 30, and 50 percent admix) since DSI 1oes not have any moist-cul'ing facilities. Given time constraints :md the possibility of sample disturbance, it is not recommended that the samples be transported to SWL for moist curing, Instead, to provide a relatively constant temperature and humidity, the molded samples will be wrapped in thin plastic, placed in watertight plastic bags, and immersed in water in the DSI laboratory,

It should also be noted that the permeability, wet1 dry, compression test, and TCLP samples, molded at the optimum quantity of each admix, will be placec! in water as specified above at OSI for approximately 2 days after molding, before transport to SWL for moist curing. This will allow the samples to attain initial set (strength) prior to transport and should minimize any potential sample disturbance.

if you have any QL'.estions or need additional information r'!garding these modifications, pleas'! do not hesitate to contact me.

Sincerely,

I

/_). Annette S. Ponds

cb enc. xc: Hilton Frey/EPA

Debra Norris/F&J Bailey Task Force Technical Committee E ,J. Schroeder/ES Atlanta

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• •

10/28/87 (Wed)

10/29/87 (Thur)

10/30/87 (Fri)

Note:

10/31/87 (Sat)

LABORATORY SCHEDULE Bailey Waste Disposal Site

Orange County, Texas

Activity

1. Composite Samples from Beth Areas 2. Run Moisture Content(s) for Both Areas 3. Rutl Max. Den./Opt. Moist. for 30%

Cement and Fly Ash for Both Areas

1. Complete Max. Den./Opt. Moist. from Wed. (if necessary)

2. Run Max. Den./Opt. Moist. for Raw Material from Both Areas

3. Run Paint Filter Test for Raw Material from Both Areas

1. Mold Unconfined Compression Test on Samples at 5, 10, 20, 30 and 50% Cement and Fly Ash for Both Areas (See Note)

2. Performed Physical Description of Raw Materials from Both Areas

3. Run Bulk Density for Raw Material from Both Areas

4. Perform pH test for Raw Material from Both Areas

Unconfined Compression Test Samples will be Molded at a Water/Cement Ratio of 0.4 to a Density of Approximately 95% of the Maximum Density Determined for 3Q% Cement and Fly Ash

1. Run Unconfined Compression Tests on Samples Molded Friday

2. Run Max. Den./Opt. Moist. for Optimum Quantity of Cement and Fly Ash for Both Areas

No, of Samoles

2 2 (min.)

4

2

20

2

2

2

20

4

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LABORATORY SCHEDULE (Continued)

• Date Activity

11/2/87 (Mon) 1. Run pH, Bulk Density & Physical Description of Samples with Optimum Quantity of Cement and Fly Ash

2. M<'ld Wet/Dry Samples for Both Areas 3. Mold Permeability Samples for

Both Areas 4. Mol,1 Unconfined Compression Test

Sat es for Both Areas 5. Mo: · TCLP Test Samples for Both Areas

Note: All samples will be molded with the optimum quantity of cement and fly ash to 95% of maximum density at optimum moisture content.

11/3/87 (Tues) 1. Mold Unconfined Compression Tesc Samples of Raw Materials from Both Areas

11/4/87

11/5/87

11/6/87

2. Hold Permeability Samples of Raw Materials from Both Areas

3. Begin Permeabili~y Test on ~amples of Raw Materials from Both /reas

Note: All samples will be molded to 9~~ of maximum density ~t optimum moisture content.

(Wed) 1. Run Unconfined Compression Tests on Samples of Raw Materials from Both Areas

2. Run Atterberg Limit Tests on Samples of Raw Materials from Both Areas

3. Tran$port Stabilized Samples Molded On Monday to Houston Lab for Moist Curing

(Thur) 1. Complete Permeability T~st on Samples of Raw Materials from Both Areas

2. Complete Remaining Physical Tests on San;ples of Raw Materials from Both Areas

3. Break Dotm Lab Equipment & Move to Houston Lab

4. Perform 3-Day Unconfined Compression Tests at Houston Laboratory

(Fri) 1. Complete Removal of Lab Equipment and Clean Lab Area

No. of Samples

4

8 4

20

4

2

2

2

2

2

36

4

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L_ ________________________ SOUTHWESYltAH LA.90~A1'0AIES _ _J

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• Date

11/9/87 (Mon)

11/16/87 (Mon)

11/30/87 (Mon)

12/2/37 (Wed)

12/9/87 (Wed)

12/18/87 (Fri)

1.

2.

1.

2.

3.

• LABORATORY SCHEDULE

(Continued)

Activity

Perform 7-Day Unconfined Compressjon Tests on Stabilized Samples

Perform 14-Day Unconfined Compression Tests on Stabilized Samples Begin Wet/Dry Tests on Stabilized Samples

Perform 28-Day Unconfined Compression Tests on Stabilized Samples Begin Permeability Tests on Stabilized Samples TCLP Sample.s to Be Shipped

1. Complete Permeability Tests on Stabilized Samples

1. Conclude Wet/Dry Tests on Stabilized s~mples

1. Final Report Mailed to Engineering-Science

No. of Samples

4

4

8

' . 4

'. 4

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