apps.dtic.mil · REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188 Public reportinq burden for this collection of information is estimated to auerage 1 hour per response,

REPORT DOCUMENTATION PAGE Form Approved

OMB No. 0704-0188

Public reportinq burden for this collection of information is estimated to auerage 1 hour per response, including the time for reviewing instructions, searching existing data sources, qatherinq and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information including suggestions for reducing this burden, to Washington Headquarters Services. Directorate for information Operations and Reports, 1215 Jefferson Davis Highway Suite 1204 Arlington VA 22202-4302, and to the Office of Management and Budget. Paperwork Reduction Project (0704-0188), Washington, DC 20503.

1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE 04/00/87

3. REPORT TYPE AND DATES COVERED

TIJ^.AND. .SUBTITLE TAMINATION ASSESSMENT REPORT, PHASE I, SITE 1-10, SOUTH TANK FARM,

TASK 2, SOUTH PLANTS, FINAL, VERSION 3.2

6. AUTHOR(S)

7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)

EBASCO SERVICES, INC. LAKEWOOD, CO

9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRE

ROCKY MOUNTAIN ARSENAL (CO.). PMRMA COMMERCE CITY, CO

5. FUNDING NUMBERS

DAAK11 84 D 0017

8. PERFORMING ORGANIZATION REPORT NUMBER

87127R01

10. SPONSORING/MONITORING AGENCY REPORT NUMBER

11. SUPPLEMENTARY NOTES

12a. DISTRIBUTION /AVAILABILITY STATEMENT

APPROVED FOR PUBLIC RELEASE; DISTRIBUTION IS UNLIMITED

12b. DISTRIBUTION CODE

13. ABSTRACT (Maximum 200 words)

THIS FINAL REPORT DOCUMENTS THE PHASE I CONTAMINATION SURVEY OF SITE 1-10, A STORAGE TANK FARM CONSTRUCTED IN 1942.

30 SAMPLES FROM 13 BORINGS WERE ANALYZED FOR VOLATILE AND SEMIVOLATILE ORGANICS AND METALS WITH SEPARATE ANALYSES FOR AS, HG, AND DBCP. C6H6, DCPD, CH2CL2, CU, ZN, AND HG WERE DETECTED AT OR ABOVE THEIR RESPECTIVE INDICATOR RANGES. HOWEVER, THE CONCENTRATIONS OF CU AND ZN APPEAR TO BE CONSISTENT WITH THE NATURAL LEVELS OF THESE METALS.

A PHASE II PROGRAM CONSISTING OF 22 ADDITIONAL BORINGS AND SOIL GAS SAMPLING IS RECOMMENDED TO 1) DETERMINE THE EXTENT OF CONTAMINATION AND 2) DISCOVER WHETHER POTENTIAL CONTAMINANTS HAVE LEAKED FROM THE TANKS. THE VOLUME OF POTENTIALLY CONTAMINATED SOIL PRESENT IS ESTIMATED AT 74,000 CUBIC YARDS.

APPENDICES: CHEMICAL NAMES, PHASE I CHEMICAL DATA, COMMENTS AND RESPONSES.

14. SUBJECT TERMS

GEOLOGY, HYDROLOGY, GEOPHYSICAL EXPLORATION, SOIL SAMPLING, ANALYTES, CHEMICAL DATA

15. NUMBER OF PAGES

16. PRICE CODE

17. SECURITY CLASSIFICATION OF REPORT

UNCLASSIFIED

18. SECURITY CLASSIFICATION OF THIS PAGE

19. SECURITY CLASSIFICATION OF ABSTRACT

20. LIMITATION OF ABSTRACT

NSN 7540-01-280-5500 Standard Form 298 (Rev. 2-89) Prescribed by ANSI Std. Z39-18

THIS DOCUMENT IS BEST

QUALITY AVAILABLE. THE

COPY FURNISHED TO DTIC

CONTAINED A SIGNIFICANT

NUMBER OF PAGES WHICH DO

NOT REPRODUCE LEGIBLY.

87127R01 ORIGINAL

LITIGATION TECHNICAL SUPPOf C.A.R.

ROCKY MOUNTAIN ARSENAL

n

FINAL PHASE I

CONTAMINATION ASSESSMENT REPORT SITE 1-10

SOUTH TANK FARM VERSION 3.2

April 1987 Contract No. DAAK11-D-0017 TASK NO. 2 - SOUTH PLANTS

Accesion For

NTIS CRA&I DTIC TAB Unannounced Justification

FI By Distribution /

D

Availability Codes

fcfirturr

Dist

M

Avail and/or Special

EBASCO SERVICES INCORPORATED R.L STOLLAR AND ASSOCIATES

CALIFORNIA ANALYTICAL LABORATORIES, INC. UBTLINC. TECHNOS INC. GERAGHTY& MILLER, INC.

1.

DAAK11-84-D-0017

PREPARED FOR

PROGRAM MANAGER'S OFFICE FOR ROCKY MOUNTAIN ARSENAL CLEANUP

LITIGATION TECHNICAL SUPPORT AND SERVICES

ROCKY MOUNTAIN ARSENAL

87127R01 ORIGINAL

i.

FINAL PHASE I

CONTAMINATION ASSESSMENT REPORT SITE 1-10

SOUTH TANK FARM VERSION 3.2

April 1987 Contract No. DAAK11-D-0017 TASK NO. 2 - SOUTH PLANTS

FU£ COPY

Prepared by: Commerce City, u»»

EBASCO SERVICES INCORPORATED f"

I. R. L. STOLLAR AND ASSOCIATES CALIFORNIA ANALYTICAL LABORATORIES, INC.

r UBTL INC. TECHNOS INC. GERAGHTY & MILLER, INC.

Prepared for:

U.S. ARMY PROGRAM MANAGER'S OFFICE FOR ROCKY MOUNTAIN ARSENAL CONTAMINATION CLEANUP

THE VIEWS, OPINIONS, AND/OR FINDINGS CONTAINED IN THIS REPORT ARE THOSE OF THE AUTHOR(S) AND SHOULD NOT BE CONSTRUED AS AN OFFICIAL DEPARTMENT OF THE ARMY POSITION, POLICY, OR DECISION, UNLESS SO DESIGNATED BY OTHER DOCUMENTATION.

THE USE OF TRADE NAMES IN THIS REPORT DOES NOT CONSTITUTE AN OFFICIAL ENDORSEMENT OR APPROVAL OF THE USE OF SUCH COMMERCIAL PRODUCTS. THE REPORT MAY NOT BE CITED FOR PURPOSES OF ADVERTISEMENT.

TABLE OF CONTENTS

Section Page

EXECUTIVE SUMMARY K

1.0 PHYSICAL SETTING x

1.1 LOCATION ±

1.2 GEOLOGY 1

1.3 HYDROLOGY 5

2.0 HISTORY 8

3.0 SITE INVESTIGATION 14

3.1 PREVIOUS SOIL INVESTIGATIONS 14

3.2 PHASE I SURVEY 15

3.2.1 Phase I Program 25

3.2.2 Phase I Field Observations 16

3.2.3 Geophysical Exploration 17

3.2.4 Phase I Analvte Levels and Distribution 18

3.2.5 Phase I Contamination Assessment 24

3.3 PHASE II SURVEY 29

3.4 QUANTITY OF POTENTIALLY CONTAMINATED SOIL 34

4.0 REFERENCES CITED 37

Appendix 1-10-A Chemical Names and Abbreviations

Appendix 1-10-B Phase I Chemical Data

Appendix 1-10-C Comments and Responses

LIST OF TABLES

Table Page

1-10-1 Analysis of Data on Chemical Constituents Detected

During Phase I Field Study 19

1-10-2 Results of Phase I Field Study .... 20

1-10-3 Tentative Identification of Nontarget Compounds 26

iii

EXECUTIVE SUMMARY

SITE 1-10

SOUTH TANK FARM

*

Site 1-10, the south tank farm, is located in the northwestern quarter of

Section 1 at the Rocky Mountain Arsenal. It has included eleven different

tank locations and a pumphouse that were reportedly used to store fuel,

alcohol, bicycloheptadiene bottoms, dicyclopentadiene, water, D-D soil

fumigant, dibromochloropropane, and sulfuric acid. This site was investigated

under Task 2 in the spring of 1985. Thirteen borings, yielding 30 samples,

were drilled to depths ranging from 5 to 10 feet.

Benzene, dicyclopentadiene, dieldrin, and methylene chloride were detected in

samples from Site 1-10. Copper, zinc, and mercury were also detected at

concentrations above their indicator ranges. Copper and zinc were detected at

concentrations that are similar to natural levels known to occur generally in

the Task 2 sampling area soils; however, the other detected analytes warrant

further investigation in a Phase II program.

A Phase II program of 22 additional borings, yielding 60 samples, is proposed

to assess the vertical and lateral extents of mercury and the volatile and

semivolatile analytes detected in Site 1-10, as well as of organochlorine

pesticides, methylisobutyl ketone, and mercury that were detected in adjacent

Site 1-8. Based on the results of the Phase I program, the quantity of

potentially contaminated soil is revised downward from 175,000 to 74,000 cubic

yards.

PHASE I CONTAMINATION ASSESSMENT REPORT

SITE 1-10

SOUTH TANK FARM

ft

1.0 PHYSICAL SETTING

1.1 LOCATION

Site 1-10, the south tank farm, is located in the northwestern quarter of

Section 1 at the Rocky Mountain Arsenal (RMA). The site is north of Lower

Derby Lake and immediately west of Site 1-8, the salvage yard, as shown in

Figure 1-10-1. Tanks 462A, 462B (relocated), 463A, 463B, 463C, 463D

(relocated), 463E (relocated), 463F, 463G, and 463H were originally located at

this site, but tanks have been moved within the site and removed to other

locations over time. Building 461, a pumphouse, is located in the site

northeast of Tank 463B and south of an east-west railroad spur that serves the

area. Site 1-10 is a rectangle 1300 feet (ft) by 340 ft that covers an area

of 442,000 square feet (ft ). It lies at an elevation of about 5265 ft

above mean sea level (msl) with a local relief of approximately 10 ft (Figure

1-10-2). Site 1-10 was investigated under Task 2 in the spring of 1985.

1.2 GEOLOGY

The two uppermost stratigraphic units beneath the south tank farm are

Pleistocene alluvium and the Denver Formation (May, 1982/RIC 82295R01). Wells

completed in the area indicated an alluvial thickness of approximately 4 ft

(Well 01529) to 11 ft (Well 01535) (see Section 1.3). The site is located

near the top of a large east-west trending Denver Formation bedrock ridge (May

et al., 1983/RIC 83299R01). The deepest Phase I boring completed within

Site 1-10 penetrated 10 ft of alluvium consisting mainly of sandy clay and

clay. This boring is pictured in Figure 1-10-3 as it shows the greatest

thickness of section. The other borings completed at the site drilled through

sand, silty sand, and clay, with subordinate clayey silty sand and silty to

sandy clay.

The underlying bedrock of the Denver Formation consists mainly of interbedded

claystone, sandstone, and sandy claystone. Borings and wells drilled in the

Site 1-10 0018C/0062A Rev. 4/23/87

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vicinity of Site 1-10 do not penetrate the formation completely; thus the,

total thickness of the unit beneath this area is unknown. A detailed

description of the Denver Formation is found in May (1982/RIC 82295R01).

Monitoring Well 01012 (see Section 1.3), installed near the northwest corner

of the site^ penetrated approximately 25 ft of bedrock composed mainly of

mudstone with minor claystone.

1.3 HYDROLOGY

The predominant direction of surface water flow in Site 1-10 is toward the

west and south. Water flowing south out of the site enters the west-flowing

ditch south of the site boundary. This ditch terminates near the southwest

corner of the site. A small part of the northern and western portions of the

site are drained by a west-flowing ditch located just north of the site. This

ditch eventually empties into Sand Creek Lateral on the western edge of the

South Plants manufacturing complex. Surface water sampled by Shell Chemical

Company in August 1979 near the western border of Site 1-10 (Figure 1-10-4)

contained dieldrin, bladex, and benzene (Spaine & Gregg, 1983/RIC 83228R01).

The primary groundwater flow direction across RMA is toward the northwest, but

in the vicinity of the South Plants manufacturing complex, a groundwater mound

diverts the direction of the regional groundwater flow (Figure 1-10-5). As a

result, groundwater below Site 1-10 flows radially in a southeast-to-southwest

direction (ESE, 1986b/RIC 86317R01). In the spring of 1986, depth to water in

Monitoring Well 01012, located in the northwest corner of the site, was

measured at an elevation of 5258.4 ft msl, or 5.6 ft below the ground

surface. Water was reached in Phase I Boring 2 at 5254.0 ft msl, or 7.5 ft

below the ground surface.

Upgradient from Site 1-10, organic compounds were detected in groundwater

quality samples from Wells 01518, 01526, and 01530 (Silveira, 1981/RIC

83041R01). The compounds found in these wells were chloroform, benzene,

carbon tetrachloride, chlorobenzene, dichlorobenzene, bicyclohexane,

dicyclopentadiene, methylene chloride, toluene, dimethyl ketone, and

tetrahydrofuran. Within the site itself the organic compounds bicyclohexane,

Site 1-10 0018C/0062A Rev. 4/23/87

;:;i-ioi: Site Boundary

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Prepared by Ebasco Services Incorporated

dicyclopentadiene, -dichlorobenzene, chloroform, benzene, toluene, and

chlorobenzene, all of which were found in the upgradient wells, were found in

Wells 01529, 01534, and 01535 (Silveira, 1981/RIC 83041R01). Downgradient

from Site 1-10, Wells 01028 and 02562 (ESE, 1986b/RIC 86317R01; Silveira,

1981/RIC 83041R01) showed the presence of diisopropylmethyl phosphonate,

chloroform, benzene, toluene, chlorobenzene, and tetrachloroethylene.

Although these compounds were detected in wells within and downgradient from

Site 1-10, because they are representative of the class of chemicals typically

found in the groundwater beneath the South Plants manufacturing complex, their

presence in the groundwater below and downgradient from the site does not

imply that they entered the groundwater from the site.

2.0 HISTORY

Information on the history of the area defined as Site 1-10 was gathered

through a review of aerial photographs and a search of the literature and of

the Shell I, Shell II, and Juris computer databases. Based on a review of

these data, Site 1-10 has been identified as the south tank farm, which has

included eleven different revetted storage tank locations.

Aerial photographs taken between 1948 and 1982 revealed the following

information pertinent to Site 1-10. These descriptions are reported

interpretations taken from Stout and Abbott (1982/RIC 83368R01) unless

otherwise noted.

Photo Date Site Description

1948 Ten tanks are visible at Site 1-10; each tank is revetted

with earth.

1955 No change is apparent at Site 1-10 since 1948.

1966 The revetment for Tank 462B is visible, but the tank has

been removed. No other change is visible.

Site 1-10 0018C/0062A Rev. 4/23/87

Photo Date Site Description

1970 The revetment for former Tank 462B is barely visible.

Tank 462B has not been replaced. No other change is

visible.

1974 No change is apparent at Site 1-10 since 1970.

1976 Tank 463E has been removed (CAP, 1976).

1980 The revetment for Tank 463E is visible. The revetment

for former Tank 462B is barely discernible; the area has

revegetated.

1982 Tank 463D has been removed. A new tank and concrete pad

are visible between Tanks 463A and 463B (CAP, 1982).

The south tank farm was constructed in 1942 as part of the initial

construction of RMA (USAMC, 1973). Building 461, a one-story concrete and

tile pumphouse, was built, and ten welded steel, vertical storage tanks (462A,

462B, and 463A-H), revetted by soil, were installed at the site. These tanks

were set directly on the ground; undermining was a problem at times (Knaus,

1978).

The tanks were constructed of dismantled salvage material that was shipped to

RMA. In reconstructing the tanks, it was necessary to trim each steel plate

prior to welding the sheets together. Tank dimensions and capacities, once

remeasured and recalibrated were as follows:

Calibrated Capacity (Gallons)

408,562

383,109

189,776

Tank Number

Diameter (Feet)

Height (Feet)

462A 46.2 34.3

462B 44.6 24.5

463A 35.6 26.5

Site 1-10 0018C/0062A Rev. 4/23/87

Tank Number

Diameter (Feet)

35.6

Height (Feet)

26.5

Calibrated Capacity (Gallons)

463B 191,972

463C 33.8 29.2 196,274

463D 33.9 29.5 193,389

463E 34.0 29.2 192,525

463F 35.2 26.5 191,771

463G 34.9 26.5 188,696

463H 35.0 26.5 189,639

In late 1960, Tank 462B was removed from the tank farm. It was relocated in

Section 2, north of Building 325, at the fuel oil storage site for the boiler

house (Williams, 1960a). The tank was renumbered "321E" and used for fuel

storage (Williams, 1960b).

Between 1975 and 1976, a tank was removed from the south tank farm to the

hydrazine facility (Barbieri, 1986). The tank that is presently located at

the hydrazine facility is identified as Tank 463D on the RMA Basic Information

Maps (C0E, 1984). This information agrees with Supplemental Agreement No. 23

to Shell Chemical Company's lease, which indicated that Tank 463D would be

removed from Shell's lease as of August 15, 1975 (Unauthored, 1975). The tank

was apparently returned to the Army at their request (Knaus, 1975).

The 1976 aerial photograph (CAP, 1976) shows that although the tank at the

hydrazine facility is presently labeled 463D, the tank taken from Site 1-10

was taken from the position of Tank 463E shown in Figure 1-10-2, which is

based on RMA engineering drawings (RMA, 1945b). A map used by Shell in 1979

also shows Tank 463D still present in the tank farm and Tank 463E missing

(Unauthored, 1979).

A 1982 aerial photograph (CAP, 1982) of the area shows that the tank

historically identified as 463D has been moved or removed from the site, and a

tank appears in a new location between Tanks 463A and 463B. Anderson (1986)

recalls seeing a crane in the south tank farm in 1980 or 1981 move a tank

within the farm to a site between Tanks 463A and 463B. This tank was

10 Site 1-10 0018C/0062A Rev. 4/23/87

placed on a concrete pad and appropriate containment features were installed.

This tank has been identified as Tank 463E on the BMA Basic Information Maps

(COE, 1984) and by field personnel at RMA.

According to Barbieri (1986), it is unlikely that if Tank 463E was moved by

mistake to the hydrazine facility, it would have been brought back to the

south tank farm and replaced by the historically identified Tank 463D.

Apparently the tank numbers were changed at some unknown time. As the issue

is undecided, discussions of the actual uses of Tanks 463D and 463E must

incorporate the information available for both tanks.

The storage tanks located at Site 1-10 have held a variety of fluids. These

tanks were initially used by the Army and then leased to Colorado Fuel and

Iron (CF&I), Julius Hyman and Company, and Shell Chemical Company. The

following summarizes the contents of these tanks:

Tank Description

462A Used for fuel oil storage by the Army (USAMC, 1973).

Hyman and Shell both used the tank to store

dicyclopentadiene. The tank was cleaned and an

epoxy-coated bottom was installed in the late 1970s

(Hahn, 1985). Inspections of the tank during the 1960s

and 1970s indicated that the tank was pitted and was

leaking (Heifer, 1967, 1969 a-c; Obel, 1969; Reed, 1975)

462B Used for fuel oil storage by the Army, and by Shell for

the storage of crude bicycloheptadiene bottoms. The tank

was moved from the south tank farm in 1960 and renumbered

321E. It is now located west of Building 242 and north

of Buildings 321 and 325.

463A Used for alcohol storage by the Army. Both Hyman and

Shell used the tank for storage of isopropyl alcohol and

water for their endrin processes. The tank was later

used to store spent sulfuric acid for the planavin plant.

Site 1-10 0018C/0062A Rev. 4/23/87

11

Tank Description

463B Used for alcohol storage by the Army. Shell used the

tank to store D-D soil fumigant (Knaus, 1973) and spent

sulfuric acid.

463C Used for alcohol, dicyclopentadiene (Knaus, 1973), and

dichloropropene-dichloropropane storage (Shell, 1985).

463D Used to store alcohol by the Army. Shell used it to

store bicycloheptadiene bottoms and spent sulfuric acid.

Tank 463D was removed from its historical location after

1980. It is not certain whether Tank 463D, now at the

hydrazine facility, is in fact the historical tank.

463E Used to store alcohol, bicycloheptadiene bottoms,

sulfuric acid, and dibromochloropropane, successively.

Old Tank 463E was removed from its historical location.

It is uncertain whether the tank presently identified as

463E is in fact the old tank.

463F Used to store alcohol and bicycloheptadiene bottoms,

successively.

463G Used to store alcohol, dicyclopentadiene bottoms, and

sulfuric acid, successively.

463H Used to store alcohol and then sulfuric acid.

Four pumps in Building 461 were used to unload liquids from tank cars and

trucks located on the tracks and road north of the building (RMA, 1945).

Two of the pumps were used for unloading fuel oil into Tanks 462A and 462B.

Fuel oil from these tanks was pumped out and fed to a burner that provided

energy for the electrical system of RMA (Justice, 1985). Bicycloheptadiene

12 Site 1-10 0018C/0062A Rev. 4/23/87

and dicyclopentadiene bottoms were also used as fuel for the burners

(Justice, 1985). The other two pumps in Building 461 were used to pump

fluids from Tanks 463A through H. The piping of these tanks allowed the

delivery of fluid from any tank and the transfer of fluids between tanks

(RMA, 1945)*.

Because sediment accumulated in the bottom of the tanks, they periodically

required cleaning (Bisted, 1985). When a tank was cleaned it was first

emptied. Then a hole the size of a tractor was cut into the tank's side. A

portable pump was then used to remove as much of the sediment as possible,

and men with squeegies and shovels pushed the remaining sediment out of the

hole. The sediment that was removed flowed into a pit adjacent to the tank

and contained within its diked area (Knaus, 1985; Eck, 1985). The sediment

was then buried. An unidentified Shell employee believed that in 1967 Tanks

463B, 463F, and 463G were cleaned out in a fashion similar to that described

above (Unauthored, 1982). Dicyclopentadiene bottoms reportedly were removed

from these tanks (unauthored, 1982; Dreier, 1985).

Boyd (1985) and Knaus (1985) recalled a cleanup at the south tank farm in

which contaminated soil was placed in 55 gallon drums and taken off RMA.

Six documented spills at Site 1-10, the south tank farm, are summarized in

chronological order below.

Date

1948

Responsible Party

CF&I

Description of Spill

100,000 gallons (gal) of benzene spilled in

the area. The specific location of the spill

is unknown (Hahn, 1985; Denver Post, 1978;

Kauffman, 1980).

Site 1-10 0018C/0062A Rev. 4/23/87

13

Date

1963

Responsible Party

Shell

Description of Spill

17,000 gal of dicyclopentadiene were pumped

onto the ground when a tank car ran over a

hose (Shell, 1963).

August 8,

1976

Shell 1548 gal of dicyclopentadiene bottoms and

No. 6 fuel oil spilled from a broken line

between Tanks 463F and 463G (Hahn, 1985)

September

1978

Shell 50,864 gal of bicycloheptadiene and No. 6

fuel oil were lost from a broken line.

(Hahn, 1985).

Mid to Late

1970s

Shell A large spill of D-D soil fumigant occurred

at the D-D unloading spot. The failure of

a belly valve on a tank car caused the

spill (Wedler, 1985).

Undated Shell Spent acid was spilled during the filtering

of Tanks 463F and 463G. A hose hooked up

to a potable water line was used to dilute

and wash the acid into a ditch (Wedler,

1985).

3.0 SITE INVESTIGATION

3.1 PREVIOUS SOIL INVESTIGATIONS

The regional soil type in the vicinity of RMA is of the Ascalon-Vona-Truckton

Association. This association consists of loamy and sandy soils formed in

wind-laid deposits on uplands that are somewhat excessively drained to well

drained (Kolmer & Anderson, 1977/RIC 81295R07). Soil at Site 1-10 is a

Truckton loamy sand with a 1 to 3 percent slope on the west and a 3 to 9

percent slope on the east (USDA, 1974).

14 Site 1-10 0018C/0062A Rev. 4/23/87

In late 1979, Shell collected and analyzed soil samples from the south tank

farm (Kauffman, 1980). Benzene was detected in the vicinity of Tank 463F at

concentrations that ranged from 48 parts per million (ppm) to an excess of 89

ppm.

3.2 PHASE I SURVEY

3.2.1 Phase I Program

Using the methodology in the Task 2 Technical Plan (Ebasco, 1985/RIC 87006R01)

13 borings, yielding 35 samples, were to be drilled to depths ranging from 5

to 15 ft at a boring density of 1/34,000 ft2.

A field reconnaissance of the site was performed to assess and stake the

boring locations prior to drilling. A geophysical clearance of the Site 1-10

boring locations was conducted to ensure that drilling would not penetrate

underground piping, although no unexploded ordnance or other buried objects

were believed to be in the immediate vicinity of the site. Slight changes to

boring locations were made as a result of this survey (Technos, 1985). The

locations of Borings 5, 7, 8, 11, 12, and 13 were moved a few feet in order to

avoid pipes. The locations of four other borings (1, 2, 3, and 10) were

altered in order to ensure complete coverage of the site. Boring 1 was

inadvertently drilled just south of the site boundary. All other borings (4,

6, and 9) were located at their originally planned locations. No changes to

the site boundaries were made. Figure 1-10-2 shows the locations of the Phase

I borings as they were actually drilled. The sampling program was altered

because of an unexpectedly high water table and because of high volatile

organics readings.

Thirteen borings, yielding 30 samples, were actually completed at Site 1-10 as

follows:

Boring No. Depth (ft) No. of Samples

15 2

2 10 4

3 5 2

15 Site 1-10 0018C/0062A Rev. 4/23/87

Borine No. Depth (ft) No. of Samples

4 5 2

5 5.5 3

6 5 3

'7 5 2

8 5 2

9 5 2

10 5 2

11 5 2

12 5 2

13 5 2

All samples were analyzed by gas chromatography/mass spectrometry (GC/MS) for

volatile organics (except the 0-1 ft interval) and semivolatile organics; by

an inductively coupled argon plasma (ICP) screen for metals; and by separate

analyses for dibromochloropropane, arsenic, and mercury. Appendix 1-10-A

presents the specific target analytes for which laboratory analyses were

conducted. A summary of the results of these analyses is presented in

Table 1-10-1, Section 3.2.4, of this report.

3.2.2 Phase I Field Observations

Site 1-10 is a tank farm that currently contains eight tanks. Each tank,

462A, 463A, 463B, 463C, 463E, 463F, 463G, and 463H, has a soil or concrete

berm around it. Each berm is approximately 2 ft thick and at a 10 ft distance

from each tank. The area is flat, sparsely vegetated with grass, and

surrounded by roads on all four sides.

To ensure safety, in-situ air monitoring was conducted during drilling

operations using a photoionization detector (HNU) and an organic vapor

analyzer (OVA). HNU readings significantly above background were recorded at

Borings 1, 2, 4, 5, 6, and 11. OVA readings significantly above background

were recorded at Borings 2 and 5. The results of the volatile organic

readings down the borings at the sampled depths are presented in Table 1-10-2,

Section 3.2.4, of this report.

16 Site 1-10 0018C/0062A Rev. 4/23/87

Because of unusual air monitoring measurements and water levels in the soil,

additional samples were taken at the 5.8 to 6.2 ft interval of Boring 2, the

5.0 to 5.1 ft interval of Boring 5, and the 3.6 to 3.8 ft interval of Boring

6.

An M8 alarm and M18A2 test kit were used to monitor for the presence of

chemical agents in the borehole or soil samples per standard operating

procedures. The M8 alarm is used specifically to detect sarin (GB) and VX at 3

detection levels of 0.2 and 0.4 milligrams per cubic meter (mg/m ) after a

response time of 2 to 3 minutes (USAMDARC, 1979; USAMDARC, 1982). However,

many other substances in addition to these two target compounds can cause the

M8 alarm to respond, including smoke and engine exhaust. The M18A2 is used as

a backup test if an M8 alarm is triggered, as a substitute for an M8, and as a

specific check for the presence of mustard. The M18A2 detects G agents

(including tabun, GA; sarin, GB; and soman, GD); V agents; all forms of

mustard (mustard, H; distilled mustard, HD; thickened mustard, HT; nitrogen

mustard, HN); cyanogen chloride, CK; phosgene oxime, CX; lewisite, L;

ethyldichloroarsine, ED; and methyldichloroarsine, MD (HDOA, 1976). The 3

detection limit for mustard agents is 0.5 mg/m ; the detection limit for GB 3

is 0.2 mg/m .

The M8 alarm sounded at a depth of 10 ft during the drilling of Boring 2;

however, the reading could not be verified by a second M8 or by the M18A2 test

kit. No other indications of possible chemical agents were detected by these

instruments. An M260 meter was used to detect oxygen concentrations and

explosive levels. No significant deviations from background were noted. No

unexploded ordnance, buried metal, or other buried objects were detected

during drilling. No unusual coloring or staining of the core samples was

noted.

3.2.3 Geophysical Exploration

Although boring locations were cleared for safety purposes using geophysical

techniques to avoid buried pipelines, no geophysical exploration was conducted

at Site 1-10, as no other buried objects were expected to be present.

17 Site 1-10 0018C/0062A Rev. 4/23/87

3.2.4 Phase I Analvte Levels and Distribution

Benzene, dicyclopentadiene, dieldrin, and methylene chloride were detected and

copper, zinc, and mercury were found within or above indicator range in

samples from Site 1-10. The number of samples containing each analyte; and

the concentration range, median, mean, standard deviation, detection limit,

and indicator level are listed in Table 1-10-1. The results of geologic field

observations, air monitoring during drilling, and the chemical analysis of

each soil sample are summarized in Table 1-10-2. The results of geologic

field observations, air monitoring during drilling, and the chemical analysis

of each soil sample are summarized in Table 1-10-2.

Indicator levels and ranges were established to assess the significance of

metal and organic analytical values. The indicator level is the method

detection limit for organic compounds. The indicator range for metals

reflects the concentrations expected to occur naturally in RMA alluvial

soils. Selection of these ranges is discussed in the Introduction to the

Contamination Assessment Reports (ESE, 1986a).

The single occurrence of benzene was recorded at 7 micrograms per gram (ug/g)

in the 9 to 10 ft interval of Boring 2. Boring 2 was the only boring drilled

deeper than 5.5 ft, and the 9 to 10 ft interval was the only sample below the

water table. Methylene chloride was reported in the 4 to 5 ft intervals of

Borings 1, 2, and 3, all of which are located in the western portion of the

site. The concentrations of methylene chloride ranged from 2 to 90 ug/g.

Dicyclopentadiene was detected by the volatile organic compound analytical

method in Borings 4, 5, and 6 in the center of the site. It was found at a

concentration of 200 ug/g in the 4 to 5 ft interval of Boring 4, where it was

also detected by the semivolatile method, at 1 ug/g in the 5 to 5.1 ft

interval of Boring 5, and at 4 ug/g in the 3.6 to 3.8 and 4 to 5 ft intervals

of Boring 6. Dieldrin was detected at 2 ug/g in the surface (0-1 ft) interval

of Boring 3, and at 20 ug/g in the surface interval of Boring 4.

18 Site 1-10 0018C/0062A Rev. 4/23/87

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23

Metals detected within or above their respective indicator ranges in samples

from Site 1-10 were copper, zinc, and mercury. The amounts detected appear to

be uniformly distributed both laterally and vertically throughout the site.

Mercury was detected at 0.2 ug/g in the 4 to 5 ft interval of Boring 1.

Copper and zinc were within or above their indicator ranges in samples from

Borings 2, 5, 10, and 13. The distribution of analytes detected within or

above their indicator ranges at Site 1-10 in the Phase I program is presented

in Figure 1-10-6. A tabulation of all analytical data associated with the

Phase I program is presented in Appendix 1-10-B.

In addition, several compounds were detected by GC/MS that were not

conclusively identified. Table 1-10-3 lists the boring number, sample

interval depth, relative retention time (shown as "unknown number" on the the

table), concentration, sample number, lot, best-fit identification, and

comments for these nontarget compounds. It should be noted that an individual

compound may have more than one retention time, and also that a particular

retention time may be assigned to more than one compound. Therefore, Table

1-10-3 provides only a general indication of additional compounds that may be

present. In the nontarget fraction, 1,1,2,2-tetrachloreothane was tentatively

identified in Boring 12 (at the 0-1 ft interval), and a benzene was

tentatively identified in Boring 4 (4-5 ft interval). Low concentrations of

chlorinated unknowns were also found in Boring 4 (0-1 ft interval).

3.2.5 Phase I Contamination Assessment

Phase I samples from Site 1-10 had detectable levels of benzene,

dicyclopentadiene, methylene chloride, and dieldrin, and concentrations of

copper, zinc, and mercury within or above indicator range.

Benzene was detected in the single soil sample from the water table at Site

1-10, and may be a reflection of the benzene found in the groundwater

underlying the site. Although there was a benzene spill reported in the south

tank farm area, there was no indication of this compound in the near-surface

soils. Detected dicyclopentadiene concentrations were clustered in the

24 Site 1-10 0018C/0062A Rev. 4/23/87

0-1 Zn 64 4-5 CH2CL2I0

5.8-6.2 Zn 63 9-10 Benzene T

Zn 86

,'\

Dieldrin 4-5 CH2CL2 90

,'4e2B;

0-1 1 Dieldrin 20 DCPD

0-1 4-5

BIL

CH2CL2 2

cr

/

Legend

Phase I borings

Cu 23 Zn 60

[463Q, Former tank location and number

(463A)

Sampling ■ Interval (feet)

Tank and number

Analyte

0-1 I Cr 15 — Level (ug/g)

CH2CL2-Methylene Chloride

DCPD - Dicyclopentadiene

200 400

Prepared for'




FIGURE 1-10-6

Analytes Detected Within or Above

Indicator Levels



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28

vicinity of Borings. 4, 5, and 6. Historical data indicate that tanks in this

vicinity (Tanks 463A and 463F) were used to store alcohol; Tank 463F was also

used to store bicycloheptadiene but not dicyclopentadiene. Tanks 462A, 463C,

and 463G were used to store dicyclopentadiene at some time in their recorded a,

usage. There is no apparent correlation between the distribution of

dicyclopentadiene concentrations detected during Phase I and the locations of

these tanks. The distribution of methylene chloride was limited to the

western portion of the site. The two locations at which dieldrin was detected

(Borings 3 and 4) were adjacent to each other in the western portion of the

site, in the surface samples from the same borings.

The distribution of metals detected across the site showed no discernible

pattern. The single concentration of copper and the concentrations of zinc

that exceeded indicator range were all associated with clay or claystone and

are within the normal range of these metals in western soils. The only

detected concentration of mercury (Boring 1) was above its indicator range and

will be investigated further in the Phase II program.

The semivolatile method, although not certified for volatile compounds, has

been shown to be capable of detecting tetrachloroethylene, toluene,

chlorobenzene, ethylbenzene, and xylenes in the nontarget fraction. The

absence of these compounds in the nontarget results for this site is an

indication that there is no contamination present from these compounds.

3.3 PHASE II SURVEY

Based on the results of the Phase I program, a Phase II program is proposed to

further assess:

o The vertical and horizontal extent of methylene chloride in the

vicinity of Borings 1, 2, and 3;

o The horizontal extent of dieldrin in the vicinity of Borings 3 and 4;

29 Site 1-10 0018C/0062A Rev. 4/23/87

o The vertical and horizontal extent of mercury in the vicinity of

Boring 1;

o The vertical and horizontal extent of dicyclopentadiene in the

vicinity of Borings 4, 5, and 6;

o Whether organochlorine pesticides, methylisobutyl ketone, and mercury

extend into the northeast corner of Site 1-10 from Site 1-8;

o Whether potential contaminants have leaked from the tanks onto

adjacent areas; and

o Whether the benzene concentrations detected in soils in or near the

saturated zone at this site are the result of groundwater

contamination.

To satisfy the first five objectives listed above, a boring program will be

undertaken during Phase II. Hand-augered samples will also be taken to assess

whether potential contaminants have leaked from the tanks. These eleven

samples will be hand-augered where drill rig access is difficult. They will

be taken to 5 ft below the surface inside the dike and adjacent to each tank

or former tank location in Site 1-10. This part of the Phase II program will

be drilled and sampled as shown in Figure 1-10-7.

The last objective will be addressed with a Phase II soil gas program that is

proposed for Site 1-10 and portions of Sites 1-9, 2-13, and 2-2 (Figure

1-10-8). This program will assess the presence of a possible benzene plume in

the groundwater beneath these sites to explain the presence of the benzene

detected in Boring 2 of Site 1-10 and of benzene near the water table in other

sites. Soil gas survey points will be placed at 50 ft grid spacings. The

grid will be adjusted locally to avoid cultural features such as roads,

buildings, and pipelines. An estimated 700 soil gas survey points will be

placed.

30 Site 1-10 0018C/0062A Rev. 4/23/87

2-3 POH 4-5 POH 9-10 POH

0-1 OCP 2-3 OCP, POH 4-5 POH 7-8 POH

0

0-1 DCPD 4-5 DCPD 9-10 DCPD

OCP, POH,DCPD

OCP, Hg QCP,MIBK,Hq OCP,MIBK,Hg MIBK

©

(462^

Sampling-O- Interval 1 (feet)

OCP — Organochlorine pesticides

POH — Purgeable organohalogen

DCPD — Dicyclopentadiene

Hg — Mercury

Proposed phase I borings

Proposed phase I borings

Former tank location and number

Tank and number

1 DCPD . —Analyte

Sampling Plan for Borings

24,25,26,27,28,29 30,31,32,33,34

0- 4-5

SVO SV0,V0

200 400

VO - Volatile organics (PhaseI Scan)

SVO - Semivolatile organics (Phase I Scan)

MIBK - Methylisobutyl ketone

Prepared for'




FIGURE 1-10-7 Proposed Phase It Borings and Sampling Plan



31

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The number of borings and samples to be taken at specific depths during Phase II are tabulated below.

No. of Borines Depth (ft) No. of Samples

11 (hand-auger) 5 22

7 8 24

4 10 14

The number of samples to be tested by each analytical method is listed below:

Analytical Method No. of Samples

Organochlorine pesticides (OCP) 11

Dicyclopentadiene (DCPD, volatile method) 9

Purgeable organohalogen (POH) 24

Mercury (Hg) 15

Volatile organics (V0) 11

Semivolatile organics (SVO) 22

Methylisobutyl ketone (MIBK) 3

Soil Gas Survey No. of Samples

Benzene 700

Ethylbenzene 700

Toluene 700

Xylenes 700

The draft final version of this report and the proposed Phase II program have

been reviewed in an on-post M0A meeting of January 14, 1987. Comments were

received from the Colorado Department of Health on November 21, 1986, and from

Shell Chemical Company on November 17, 1986. These comments were considered

in the preparation of this final report. EPA comments are an integral part of

the report review process, and previously have been incorporated into this

report. Comments and responses are provided in Appendix 1-10-C.

33 Site 1-10 0018C/0062A Rev. 4/23/87

3.4 QUANTITY OF POTENTIALLY CONTAMINATED SOIL

The originally calculated estimate of the extent of potentially contaminated

soil (EMACCPMT, 1984/RIC 84034R01) was:

Estimated Areal Extent = 473,600 ft ;

Estimated Vertical Extent = 10 ft; and 3

Estimated Volume = 175,000 cubic yards (yd ).

As a result of Phase I analyses, the estimated volume of potentially 3

contaminated soil has been revised to 74,000 yd based on the following

data. The 9 to 10 ft interval of Boring 2 is the deepest interval sampled

during Phase I, and it contained detectable levels of benzene. However,

groundwater was reached at 7.5 ft in the same boring. The benzene is

considered to be associated with a groundwater plume and its extent will be

investigated in the Phase II program.

Dicyclopentadiene and methylene chloride were detected in the 4 to 5 ft

intervals of Borings 1, 2, 3, 4, 5, and 6. The area encompassing these

borings is bounded by the site boundaries on the north, south, and west and by

a north-south line passing through Boring 11 on the east. The area of this 2 portion of the site is 261,800 ft . In addition, a circle with a radius of

50 ft around Boring 1 is assumed to be potentially contaminated (Figure

1-10-9). The area of the part of the circle beyond the site boundary is 5333 2 2

ft measured by planimeter, giving a total area of 267,133 ft . This area

is considered to be potentially contaminated to a depth of 7.5 ft, the depth

to the water table. Therefore, the total estimated volume of potentially 3

contaminated soil is 74,000 yd .

Results from the Phase I survey were used to generate a most conservative

(worst-case) estimate of the volume of potentially contaminated soil at Site

1-10. This delineation of the boundaries of potential contamination should

not be construed to indicate the actual presence of contamination within the

volumes outlined. In addition, this approach is not intended to imply that

any or all of the soil within the potentially contaminated volume must be

34 Site 1-10 0018C/0062A Rev. 4/23/87

\ ■

/ \

7 ,-X / s

/ /

Legend

© Phase 1 borings

>Z Area of Potentially Contaminated Soil (0- 7.5 ft.)

(462B/ Relocated tank and number

462AJ Tank and number

t N

] 200 400

FEET

Prepared for--




Drafted = 2/28/87

FIGURE 1-10-9

Quantity of Potentially Contaminated Soil Rocky Mountain Arsenal, Task 2

Prepared by- Ebasco Services Incorporated

35

mediate*, nor does it «a*« any —Ption — *■ «" ° ^ ^ ^

My be reared. Rather; this •»»«* * «■"— " P-«*P »° » TtiMates of the -*- —««• vol«e of eontaainated »arerials for

planning purposes only.

«, estimated »I- of potentially contaminated soil »ill U refined fnrther

after the results of the Phase II program «re obtained.

R. L. St

th R. L.

Computer

36

Site 1-10 0018C/0062A Rev. 4/23/87

Compute

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ocky Mo neer Di

t of 40

s Compu

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THIS PAGE

IS MISSING

IN ORIGINAL

DOCUMENT

HDOA (Headquarters-Department of the Army). 1976. Technical manual, detector kit, chemical agent, ABC-M18A2. TM3-6665-254-12.

Helfer, M.G. 1967, June 19. Inspection report titled, acetylene tank farm. Shell Chemical Company, Microfilm RSH925, Frames 1013-1013.

Helfer, M.G.* 1969, January 22. Inspection report - Tank 462A. Shell Chemical Company, Microfilm RSH925, Frame 1012.

Heifer, M.G. 1969, July 15. Inspection report - Tank 462A. Shell Chemical Company, Microfilm RSH925, Frames 1009-1010.

Heifer, M.G. 1969, August 7. Inspection report - Tank 462A. Shell Chemical Company, Microfilm RSH925, Frame 1008.

HDOA (Headquarters-Department of the Army). 1976. Technical manual, detector kit, chemical agent, ABC-M18A2. TM3-6665-254-12.

Justice, K.L. 1985, June 19. Juris deposition, v. 1. Juris Computer Database.

Kauffman, G.W. 1980a, March 24. Water Analysis - Denver Plant leasehold wells. Shell Chemical Company. Microfilm RSH815, Frames 2048-2049.

Kauffman, G.W. 1980b, September 10. Soil samples - south tank farm - Denver chemical plant. Shell Chemical Company. Microfilm RSH912, Frames 0979-0983.

Knaus, J.H. 1973, July 27. Air contaminant emission notice. Microfilm RSH925, Frames 1765-1768.

Knaus, J.H. 1975, September 10. Letter from Shell to Histerek requesting that Tank 463D be released from its lease. Microfilm RSH928, Frames 1753-1753.

Knaus, J.H. 1978, March 31. Letter from Shell discussing the renovation of the south tank farm. Microfilm RSH867, Frames 1676-1693.

Knaus, J.H. 1985, October 15. Juris deposition, v. 3. Juris Computer Database.

RIC 81295R07 Kolmer, J.R., and G.A. Anderson. 1977. Installation restoration of RMA,

part I - pilot containment operations final environmental impact statements. Microfilm RMA065, Frames 0484-0485.

RIC 82295R01 May, J.H. 1982. Regional groundwater study of Rocky Mountain Arsenal,

Colorado: Report #1, hydrogeological definition. USAEWES. Microfilm RMA040, Frames 1851-1931.

38 Site 1-10 0018C/0062A Rev. 4/23/87

RIC 83299R01 May, J.H., J.K. Crabtree, R.W. Hunt, and W.L. Murphy. 1983, September.

Hydrogeology of Basin A/South Plants Area, Rocky Mountain Arsenal, Denver, Colorado, phase I. USAEWES. Microfilm RVA001, Frames 1132-1297.

Obel, J.A. 1969, October 24. Inspection report - Tank 462A. Shell Chemical Company, Microfilm RSH925, Frame 1007.

Reed, R.A. 1975, August 14. Inspection report - Tank 462. Shell Chemical Company. Microfilm RSH925, Frame 1004.

RIC 82096R01 Resource Consultants, Inc. 1982, March. Surface water hydrologic analyses.

Rocky Mountain Arsenal. USATHAMA.

RMA. 1945a, August 15. History of Rocky Mountain Arsenal - 1945, part VII, production operations, Section 6, H manufacturing plant. Microfilm RSA009, Frames 1058-1077.

RMA. 1945b. Engineering drawings D-675A and D-673.

RIC 84034R01 RMACCPMT. 1984. Decontamination assessment of land and facilities at

Rocky Mountain Arsenal, draft final report and executive summary. RMA, USATHAMA, and D'Appolonia.

Shell (Shell Chemical Company). 1963, September. Cyclo unit operations, Denver Plant. Microfilm

RSH928, Frames 0575-0576.

Shell, 1985. Shell's response to Army Interrogatory #3. Department of Justice.

RIC 83041R01 Silveira, E.J. 1981. Analysis of Denver water samples. Shell Technical

Progress Report No. M-9-81.

RIC 84100R01 Spaine, P.A., and R. Gregg. 1983. Surface water quality study of the

South Plants Area.

RIC 83368R01 Stout, K. and L. Abbott. 1982, October. Installation assessment,

Rocky Mountain Arsenal, v. I and II. Bionetics Corporation, EPA, USATHAMA. Microfilm RAA020, Frames 1451-1498, 1578-1701.

Technos (Technos Inc.). 1985. Geophysical investigation at the South Plants area of Rocky Mountain Arsenal, Denver, Colorado. Prepared for Envirosphere Company and USATHAMA. Ebasco No. 32523.

39 Site 1-10 0018C/0062A Rev. 4/23/87

Unauthored. 1975. Supplemental agreement No. 23 to Lease No. W025-075-ENG-7886. Shell Chemical Company lease with Army. Microfilm RSH931, Frames 0794-0803.

unauthored. 1979. Map titled, south tank farm, benzene, ppm. Microfilm RSH808, Frames 0437-0437.

*

Unauthored. 1982. Past landfill activity. Microfilm REX001, Frames 0055-0075.

USAMC (U.S. Army Materiel Command). 1973. Army Materiel Command contamination survey, Rocky Mountain Arsenal. Microfilm RMA031, Frames 1312-1392.

USAMDARC (U.S. Army Materiel Development and Readiness Command). 1979. Safety regulations for chemical agent H. DARC0M-R 385-31. Department of the Army.

USAMDARC. 1982. Safety regulations for chemical agents GB and VX. DARC0M-R 385-102. Department of the Army.

USDA (United States Department of Agriculture). 1974, October. Soil survey of Adams County, Colorado. Soil Conservation Service.

Wedler, E.H. 1986, April 29. Juris deposition, v. 1. Juris Computer Database.

Williams, O.M. 1960a, November 14. Letter from Shell discussing the reassignment of Tank 462B. Microfilm RSH934, Frame 0705.

Williams, O.M. 1960b, December 2. Letter from Shell discussing the installation of Tank 462B. Microfilm RNA009, Frames 0703-0704.

40 Site 1-10 0018C/0062A Rev. 4/23/87

Appendix 1-10-A

Chemical Names and Abbreviations

APPENDIX 1-10-A Chemical Names and Abbreviations

Analytes

Volatile Organics 1,1-Dichloroethane 1,2-Dichloroethane 1,1,1-Trichloroethane 1,1,2-Trichloroethane Benzene Bicycloheptadiene Carbon tetrachloride Chlorobenzene Chloroform Dibromochloropropane Dicyclopentadiene Dimethyldisulfide Ethylbenzene m-Xylene Methylene chloride Methylisobutyl ketone o- and p-Xylene Tetrachloroethylene Toluene trans-1,2-Dichloroethylene Trichloroethylene

Semivolatile Organics 1,4-Oxathiane 2,2-bis(Para-chlorophenyl)-

1,1-dichloroethane 2,2-bis ( Para-chlorophenyl)- 1,1-1-trichloroethane

Aldrin Atrazine Chlordane Chlorophenylmethyl sulfide Chlorophenylmethyl sulfone Chlorophenylmethyl sulfoxide Dibromochloropropane Dicylopentadiene Dieldrin Diisopropylmethyl phosphonate Dimethylmethyl phosphonate Dithiane

Synonymous Names Used in AoDendix B Abbreviations

1,1-Dichloroethane 11DCLE 1,2-Dichloroethane 12DCLE 1,1,1-Trichloroethane 111TCE 1,1,2-Trichloroethane 112TCE Benzene C6H6 Bicycloheptadiene BCHPD Carbon Tetrachloride CCL4 Chlorobenzene CLC6H5 Chloroform CHCL3 Dibromochloropropane DBCP Dicyclopentadiene DCPD Dimethyldisulfide DMDS Ethylbenzene ETC6H5 m-Xylene 13DMB Methylene Chloride CH2CL2 Methylisobutyl Ketone MIBK Ortho- & Para-Xylene XYLEN Tetrachloroethene TCLEE Toluene MEC6H5 Trans-1,2-Dichloroethene T12DCE Trichloroethene TRCLE

1,4-Oxathiane OXAT Dichlorodiphenylethane PPDDE

Dichlorodiphenyltrichloro- PPDDT ethane

Aldrin ALDRN Atrazine ATZ Chlordane CLDAN p-Chlorophenylmethyl sulfide CPMS p-Chlorophenylmethyl sulfone CPMS02 p-Chlorophenylmethyl sulfoxide CPMSO Dibromochloropropane DBCP Dicyclopentadiene DCPD Dieldrin DLDRN Diisopropylmethyl phosphonate DIMP Dimethylmethyl phosphate DMMP Dithiane DITH

Site 1-10 0018C/0062A Rev. 4/23/87

APPENDIX 1-10-A (Continued)

Synonymous Names Used Analvtes in Appendix B Abbreviations *

Semivolatile Organics (Continued) Endrin Endrin ENDRN Hexachlorocyclopentadiene Hexachlorocyclopentadiene CL6CP Isodrin Isodrin ISODR Malathion Malathion MLTHN Parathion Parathion PRTHN Supona 2-Chloro-l (2,4-Dichlorophenyl)

vinyldiethyl Phosphates SUPONA

Vapona Vapona DDVP

ICP Metals Screen Cadmium Cadmium CD Chromium Chromium CR Copper Copper CU Lead Lead PB Zinc Zinc ZN

Separate Analyses Dibromochloropropane Dibromochloropropane DBCP Arsenic Arsenic AS Mercury Mercury H6

Site 1-10 0018C/0062A Rev. 4/23/87

Appendix 1-10-B

Phase I Chemical Data

APPENDIX 1-10-B Phase I Chemical Data

The analytical results of the laboratory analysis of soil samples collected as

part of the4Phase I program comprise the first part of Appendix 1-10-B. Data

are listed sequentially by boring number and successive depths below the

surface. Within each depth, all analytes for which the samples were tested

are listed alaphabetically. Results are given as less than (LT) the detection

limit for the test laboratory, or as detected concentrations above this

limit. Based on the accuracy of laboratory test methods, values for volatile

and semivolatile compounds are considered accurate to one significant figure,

values for dibromochloropropane when tested separately and for metals are

considered accurate to two significant figures.

The second part of Appendix 1-10-B contains data from the blanks associated

with Phase I analytical work. Blanks for Phase I soil samples were based on a

homogenized subsample of composited samples from a known uncontaminated soil

that is stratigraphically similar to the RMA soils. Blanks for Phase I water

samples were based on distilled water. Control samples, or blanks, are

introduced into the train of environmental samples to function as monitors on

the performance of the analytical method. These samples function as quality

control (QC) samples, and are an integral part of the quality assurance (QA)

program for the project. The method blanks listed in this Appendix were

utilized to verify that the laboratory was not a source of sample

contamination. If contamination were detected in a method blank, corrective

actions were taken to assure that reported concentrations of target analytes

reflected sample analytes, and not analytes introduced by the laboratory

process.

Site 1-10 0018C/0062A Rev. 4/23/87

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Appendix 1-10-C

Comments and Responses

COLORADO DEPARTMENT OF HEALTH Richard D. Lamm V+Ê!^'*^ Thomas M. Vemon, M.D. Governor ^îRlb^S Executive Director

November 21, 1986

Colonel W. Quintrell Deputy Program Manager RMA Contamination Cleanup AMXRM-EE, Bldg. 4585 Aberdeen Proving Ground Maryland 21010-5401

Dear Colonel Quintrell:

Enclosed are our review comments on Tasks 2, 7 and 12, Draft Final Source Reports for the following sites: source

Task 2

Site 1-10 South Tank Farm Site 1-8 Salvage Yard Site 2-6 Salt Storage Pad

Task 7

Section 1 Uncontaminated Areas Section 2 Uncontaminated Areas

Task 12

Site 1-2 Upper and Lower Derby Lakes Site 11-1 Buried Lake Sludge Site 6-2 Eastern Upper Derby Lake Site 1-12 Trash Dump Site 12-JL Rod and Gun Club Pond

If you have any questions on the enclosed comments, please contact Mr Chris Sutton with the Water Quality Control Division.

Sincerely,

Thomas P. Looby Remedial Programs Director

cc: Howard Kenison, Colorado Attorney General Office Robert Duprey, ÜSEPA, Region VIII Robert Lundahl, Shell Oil Company

4210 EAST 11TH AVENUE DENVER, COLORADO 80220 PHONE (303) 320-8333

RESPONSES TO COMMENTS OF

COLORADO DEPARTMENT OF HEALTH ON

DRAFT FINAL CONTAMINATION ASSESSMENT REPORT

SITE 1-10, TASK 2

Comment 1; We disagree with the characterization that "None of the nontarget p. 1-10-26 compounds detected were of sufficient significance to affect

Phase II planning." It appears there may be a substantial fuel-related contaminant plume above the water table extending through Borings #1, 2, 4, 5, 6 and 11. The Phase II investigations should be designed to better characterize the extent of this contamination.

Response; An additional 22 borings and 64 samples are being proposed in Phase II for this site. Of this total, 11 borings will be drilled to analyze for both volatile and semivolatile organic compounds utilizing Phase I methods and a scan for nontarget compounds will be conducted. A soil gas study is also being proposed for Phase II investigations in the entire site area to delineate and define the extent of possible volatile organic contamination.

Comment 2; It is not clear that there are sufficient Phase II borings in p. 1-10-26 the vicinity of Borings 3 and 4 to identify the horizontal

extent of dieldrin in this area.

One Phase II boring (#18) is insufficient to characterize the vertical and horizontal extent of mercury near Boring #1.

One of the Phase II objectives should be to determine the vertical and horizontal extent of DCPD found in Borings 4, 5 and 6 at up to 200 ppm. One Phase II boring (#16) is insufficient to achieve this objective. More borings should be constructed north and south of these borings.

Response; Borings 15, 16, 21, and 22 have been added to define the horizontal extent of dieldrin.

Borings 17, 18, 19, and 20 have been added to determine the horizontal and vertical extent of mercury.

Borings 21, 22, and 23 have been added to determine the horizontal and vertical extent of DCPD.

Site 1-10 0018C/0062A Rev. 4/30/87

Comment 3: p. 1-10-25

Response;

Comment 4: p. 1-10-28

It appears that the vertical extent of contamination extends into-the saturated zone at this site. Phase II borings should extend to at least 15 ft below surface beneath the areas of highest contamination with depth.

Monitoring well data from this site indicate that the groundwater is contaminated with organic compounds. We agree that Phase II borings should extend at least to the water table. It was reached at 7.5 feet in Phase I, but many Phase II borings are being planned to 10 feet in the event that the water levels have dropped. If the saturated zone is not reached at 10 feet, the borings will be extended. Groundwater contamination is being related to saturated soils in Task 23.

We disagree that the extent of contamination has been characterized in Phase I and therefore we do not concur with the revised estimates of soil contamination. In particular, the vertical extent should not be reduced from the original 10 ft estimate at this time.

Response: The estimate of soil contamination is for the unsaturated zone only, and is based upon the depth at which the saturated zone was reached during Phase I drilling (7.5 ft).

Site 1-10 0018C/0062A Rev. 4/30/87

Shell Oil Company

One Shell Plaza

P.O. Box 4320

Houston. Texas 77210

November 17, 1986

USATHAMA Office of the Program Manager Rocky Mountain Arsenal Contamination Cleanup ATTN: AMXRM-EE: Chief: Mr. Donald L. Campbell Bldg E4585, Trailer Aberdeen Proving Ground, MD 21010-5401

Dear Mr. Campbell:

Enclosed herewith are Shell's comments on the draft final copies of Contamination Assessment Reports for Sites 1-8, 1-10, and 2-6.

Very truly yours,

k^< C. 4C. Hahn Denver Site Project

RDL:ajg

Enclosure

cc: USATHAMA Office of the Program Manager Rocky Mountain Arsenal Contamination Cleanup ATTN: AMXRM-EE:.Mr. Kevin T. Blose Bldg E4585, Trailer Aberdeen Proving Ground, MD 21010-5401

Mr. Thomas Bick Environmental Enforcement Section Land & Natural Resources Division U.S. Department of Justice P.O. Box 23896 Benjamin Franklin Station Washington, D.C. 20026

Major Robert J. Boonstoppel Headquarters - Department of the Army ATTN: DAJA-LTS Washington, DC 20310-2210

BRHM8631101

RESPONSES TO COMMENTS OF

SHELL CHEMICAL COMPANY ON

DRAFT FINAL CONTAMINATION ASSESSMENT REPORT

SITE 1-10, TASK 2

Comment 1; Paragraph describing 1980 photo. First paragraph of 2.0 History p. 1-10-7 states that the pump house was built in 1942.

Response: The pumphouse was built in 1942; the sentence on p. 1-10-7 under the 1980 aerial photo description is misleading and has been deleted.

Comment 2; Figure 3.1-1

Response;

Comment 3; p. 1-10-8

Response;

Comment 4; p. 1-10-9

Response;

The legend title should be revised to: "Analytes Detected Above Indicator Level Range at Site 1-10".

The title of this figure is being revised to read "Analytes Detected Within and Above Indicator Levels" in all reports.

DD Soil Fumigant, but not Nemagon, was stored in Tank 463C.

Our original research showed that Nemagon (Army Interrogatory #3) was stored in Tank 463C. We searched our records and agree that D-D soil fumigant and not Nemagon was stored here.

The 50,864-gallon spill was reported to be a mixture of bicycloheptadiene bottoms and No. 6 fuel oil.

Our research has verified that the 50,864 gallon spill was a mixture of bicycloheptadiene bottoms and No. 6 fuel oil. The text has been revised.

Comment 5; A triangle of borings should be drilled around Boring 1 Fig. 3.1-2 establish the lateral and vertical extent of mercury

contamination.

to

Two borings, one south and one east of Boring 3, should be drilled to establish the lateral and vertical extent of methylene chloride contamination.

In addition to Boring 15, two other borings should be drilled to triangulate Borings 3 and 4 to establish lateral and vertical extent of dieldrin contamination. This will also provide a triangulation of Borings 4, 5, and 6 to establish lateral and vertical extent of DCPD contamination.

Site 1-10 0018C/0062A Rev. 4/30/87

Response; Four additional borings have been placed around Boring 1 to determine the vertical and lateral extent of mercury.

Two additional borings have been placed around Boring 3, and Boring 15 have been moved closer to Boring 3 to complete the triangulation.

Borings 21, 22, and 23 have been added to determine the horizontal and vertical extent of DGPD.

Site 1-10 0018C/0062A Rev. 4/30/87

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