FIO - PA_MilitaryWash_2006.pdf

US Army Corps of Engineers® Rock Island District

Defense Environmental Restoration Program for

Formerly Used Defense Sites

Military Munitions Response Program

CERCLA Preliminary Assessment

.For the

BORREGO SPRINGS NAVY-MILITARY

WASH

San Diego County, California

Project Number J09CA701105

31 October 2006

B5EDDL9S

Typewritten Text 200-1e J09CA701105_01.09_0500_a

CJ)P~

DEPARTMENT OFTHE ARMY

HUNTSVILLE CENTER, CORPS OFENGINEERS

P.O. BOX 1600

HUNTSVILLE, ALABAMA 35807-4301

CEHNC-OE-CX 31 October 2006

MEMORANDUM FOR Commander, US Army Engineering District, Los Angeles (CESPL-PM-Mffawny Tran),PO Box 2711, Los Angeles, CA 95814-2922

SUBJECT: DefenseEnvironmental RestorationProgram, Fonnerly Used Defense Sites, Ordnance and Explosives, Chemical Warfare Materials, ArchivesSearchReport (ASR), Borrego SpringsNavy-Military Wash, San Diego County, CA,Project No. J09CA70l105 ~

1. Enclosed is the final ASR for the above subject site. In accordancewith the Technical Advisory Group(TAG) review assigneda RAC 4.

2. CEHNC will enter a RAC 4 into FUDSMIS.

3. If you disagreeor have any questions concerningthe action, please call me at 256-895-1797 or DSN 760-1767.

FOR THE DIRECTOR:

Encl

;-~.MARDIS

ArchivesSearch ReportManager

CF:

Commander,US Army EngineerDistrict,Rock Island (CEMVR-ED-DOlBob Hoffman), PO Box 2004, Rock Island, n, 61204-2004 (w/encls)

B5EDDL9S

Highlight

DEFENSE ENVIRONMENTAL RESTORATION PROGRAM

• FOR

FORMERLY USED DEFENSE SITES

MILITARY MUNITIONS RESPONSE PROGRAM

CERCLA PRELIMINARY ASSESSMENT

FOR

BORREGO SPRINGS NAVY-MILITARY WASH

SAN DIEGO COUNTY, CALIFORNIA

PROJECT NUMBER J09CA701105

31 October 2006

Prepared For

U.S. Army Corps of Engineers

Engineering and Support

Center, Huntsville

ATTN:CEHNC-OE

P.O. Box 1600

Huntsville, Alabama 35807-4301

Prepared By

U.S. Army Corps of Engineers

Rock Island District

ATTN: CEMVR-EC-DO

P.O. Box 2004

Rock Island, Illinois 61204-2004

CERCLA PRELIMINARY ASSESMENT

TABLE OF CONTENTS

Section Page

1 . 0 INTRODUCTION••................•.•.........•

2.0 PREVIOUS INVESTIGATIONS 3

2.1 Corps of Engineers Investigations

2.2 Other Reports

3 . 0 SITE DESCRIPTION 4

3.1 Location

3.2 Prior Land Use

3.3 Existing Land Use and Ownership

3.4 Climatic Data

3.5 Topography

3.6 Geology and Soils

3.7 Hydrology

3.8 Natural Resources

3.9 Historical/Cultural Resources and Demographics

4.0 HISTORICAL PROPERTY SUMMARY 6

4.1 Chronological Property Summary

4.2 Historical Military Munitions Usage

4.3 Potential Features of Environmental Interest

4.4 Map Analysis

4.5 Aerial Photograph Interpretation

4.6 Interviews

5. 0 SITE ELIGIBILITY 9

5.1 Confirmed FUDS

5.2 Additional Confirmed FUDS Acreage

5.3 Potential FUDS

http:INTRODUCTION��................�.�.........�

TABLE OF CONTENTS (continued)

Section Page

6 . 0 VISUAL SITE INSPECTION

6.1 General Procedures and Safety

6.2 Property Inspection Synopsis

7.0 PROPERTY MEC/RCWM TECHNICAL DATA 11

7.1 MEC Technical Data

7.2 Munitions Constituents

8.0 EVALUATION OF MEC/RCWM PRESENCE 13

8.1 General Evaluation of MEC/RCWM Presence

8.2 Property-Specific Locations

9.0 PATHWAY AND ENVIRONMENTAL HAZARD ASSESSMENT 15

9.1 Groundwater Pathway

9.1.1 Hydrogeologic Setting

9.1.2 Groundwater Targets

9.1.3 Groundwater Conclusions

9.2 Surface Water Pathway

9.2.1 Hydrologic Setting

9.2.2 Surface Water Targets

9.2.3 Surface Water Conclusions

9.3 Soil Exposure and Air Pathways

9.3.1 Physical Conditions

9.3.2 Soil and Air Targets

9.3.3 Soil Exposure and Air Pathway

Conclusions

10.0 SUMMARY OF MMRP AND HTRW 16

10.1 Summary of MMRP Findings

10.2 Summary of HTRW Findings

11 . a RECOltlM:ENDATION •••••••••••••••••••••.•••••••.•••••• 16

·e

TABLE OF CONTENTS (continued)

APPENDICES

Appendix A REFERENCE SOURCES AND RECORDS REVIEWED Appendix B REFERENCES Appendix C ABBREVIATIONS, ACRONYMS, AND BREVITY CODES Appendix D GLOSSARY Appendix E1 ORDNANCE TECHNICAL DATA SHEETS Appendix E2 PHYSICAL AND CHEMICAL CHARACTERISTICS DATA

SHEETS

Appendix F TEXTUAL REFERENCES Appendix G STILL PHOTOGRAPH REFERENCES Appendix H MAPS/DRAWINGS REFERENCES Appendix I INTERVIEWS Appendix J ABBREVIATED SITE SAFETY AND HEALTH PLAN (ASSHP) Appendix K VISUAL PROPERTY INSPECTION REPORT Appendix L VISUAL PROPERTY INSPECTION PHOTOGRAPHS Appendix M PRELIMINARY ASSESSMENT FORM Appendix N TAG REVIEW FACT SHEET Appendix 0 RESPONSE TO COMMENTS Appendix P REPORT DISTRIBUTION

TABLES

2-1 DERP FUDS PRELIMINARY ASSESSMENT PROJECTS 3

3-1 CURRENT LAND USAGE 4

7-1 AMMUNITION USED AND EXPLOSIVE/CHEMICAL FILLERS 11

7-2 CHEMICAL DATA OF ORDNANCE FILLERS 12

REPORT PLATES

1. SITE MAP

2. TARGET LAYOUT

3. MMRP PROJECT AREAS

4. REAL ESTATE

5. PHOTOGRAPH LOCATIONS

EXECUTIVE SUMMARY

This report is a CERCLA Preliminary Assessment. It presents a historical records search and property inspection for the presence of Munitions and Explosives of Concern (MEC).

The investigation was performed under the authority of the Defense Environmental Restoration Program for Formerly Used Defense Sites. The investigation concluded that there are MEC concerns on this property.

Borrego Springs Navy-Military Wash, also known as Borego Wash Bomb Target and Target 64, Borrego Wash, was one of several Navy practice bomb targets in the Borrego and Imperial Valleys of southern California. The Navy obtained a permit dated 3 November 1942 from the State of California, Division of Beaches and Parks and comprised 640 acres of land identified as Section 20, Township 11 south, Range 8 East, San Bernardino Base and Meridian. However, this section of the Borrego Desert has never been surveyed and the actual target is to the west. The target was active for practice bombing, strafing, and rocketry from 1 May 1943 to 30 April 1945 and again from 1 May 1949 to April 1953.

Records indicate that the Navy conducted at least one explosive sweep of the area in 1954. During the assessment team's visit in June 2004, only munitions debris consisting of expended .50 caliber and 20-mm projectiles, cartridge links, Mk 23 and M38A1 practice bomb debris, and SCAR practice rockets were observed. However munitions debris is considered MPPEH until technically qualified personnel inspect, verify and certify that it does not present an explosive hazard. In 1996, two 5-inch rockets were found and countercharged in the area.

Based on the forgoing observations and incident, a confirmed MEC presence of 1,460 acres is warranted. This consists of a radius of 4,500 feet around the center of the target. This figure was derived from Navy observations at the time of the 1954 sweep.

Due to the arid nature of the property, any MEC is likely to be still intact and groundwater, surface water, soil, and air are not considered to be factors of concern.

The

Function

On-Site Assessment

Engineering Support

Historical Research

Geographic District Support

Industrial Hygiene

CADD

ACKNOWLEDGMENTS

following persons provided support as indicated.

Name

Joe W.

Vann 111*

Title

UXO Safety Specialist

Organization Telephone

CEMVR-EC-DO (309)794-5163

Warren Vincent

Robert E.

Hoffman

Thomas Reinhardt

Civil Engineering Technician

Environmental Engineer

Quality Assurance Specialist (Ammunition Surveillance)

CEMVR-EC-DO

CEMVR-EC-DO

CEMVR-EC-DO

(309)794-5199

(309)794-5504

(309)794-5225

Michael Harper

James Reynolds

Quality CEMVR-EC-DO Assurance Specialist (Ammunition Surveillance)

Quality CEMVR-EC-DO Assurance Specialist (Ammunition Surveillance)

(309)794-5216

(309)794-5189

Calvin Cox

Cathy Sonnenberg

Jason P.

Jones

Project Manager

Industrial Hygienist

Civil Engineering Technician

CESPL-PM

MCXM-PMA

CEMVR-EC-DO

(213) 452-4031

(309)782-0806

(309)794-5643

* Team Leader

CERCLA PRELIMINARY ASSESMENT

1.0 INTRODUCTION

1.1 Authority

1.1.1 This report presents the findings of a

historical records search and site inspection for Munitions and Explosives of Concern (MEC) located at the former Borrego Springs Navy-Military Wash (see plate 1 for a general location map). The investigation was performed under the authority of the Defense Environmental Restoration Program for Formerly Used Defense Sites (DERP-FUDS) using a CERCLA process.

1.1.2 The investigation focused on approximately

1675 acres located in San Diego County, California. The U.S .

Navy used the property as a strafing and practice bombing from 1 May 1943 to 30 April 1953. During this period the site was officially known as Borrego Wash Target No. 64.

1.2 Subject and Purpose

As this property was used as a strafing and bombing range it is considered to be a Munitions Response Area (MRA). The purpose of this investigation was to characterize the MRA for potential MEC presence, to include conventional ammunition, missiles, and Chemical Warfare Materiel (CWM). The MRA was subdivided into Munitions Response Sites (MRS) to delineate the various hazards in different portions of the MRA. This was achieved by a thorough evaluation of historical records, interviews and an on-site visual inspection.

1.3 Scope

1.3.1 This report presents the site history, site

description, real estate ownership information, and confirmed MEC presence (prior to and after MRA use by the military) , based on available records, interviews, site inspections, and analyses. The analysis provides a complete evaluation of all information to assess current day potential MEC presence, where actual MEC presence has not been confirmed.

1.3.2 For the purpose of this report, MEC includes

the following categories of military munitions that may pose unique explosives safety risks:

1.3.2.1 Unexploded Ordnance (UXO), as defined

in 10 U.S.C. 2710 (e) (9). These are military munitions that have been primed, fuzed, armed, or otherwise prepared for action; have been fired, dropped, launched, projected, or placed in such a manner as to constitute a hazard to operations, installations, personnel, or material; and remain unexploded either by malfunction, design, or any other cause.

1.3.2.2 Discarded military munitions (DMM), as defined in 10 U.S.C. 2710 (e) (2). These are military munitions that have been abandoned without proper disposal of removed from storage in a military magazine or other storage area for the purpose of disposal. The term does not include unexploded ordnance, military munitions that are being held for future use or planned disposal, or military munitions that have been properly disposed of consistent with applicable environmental laws and regulations.

1.3.2.3 Munitions constituents (MC) as

defined in 10 U.S.C. 2710 (e) (4). This is any material originating from unexploded ordnance, discarded military munitions, or other military munitions, including explosive and non-explosive materials, and emission, degradation, or breakdown elements of such ordnance or munitions.

1.3.2.4 Military Munitions includes all

ammunition products and components produced for or used by the armed forces for national defense and security, including ammunition products or components under the control of the Department of Defense, the Coast Guard, the Department of Energy, and the National Guard. The term does not include wholly inert items. None of the materiel addressed in this report is under accountable record control of any DoD organization or activity.

1.3.2.5 Material Potentially Presenting an

Explosive Hazard (MPPEH) may contain MEC. This includes munitions containers and packaging material: munitions debris remaining after munitions use, demilitarization, or disposal and range-related debris. MPPEH additionally includes material potentially contaminated with high enough concentration of explosives such that the material presents an explosive hazard (e.g. equipment, drainage systems, holding tanks, piping, and ventilation ducts. Munitions debris is considered MPPEH until technically qualified personnel inspect, verify and certify that it does not present an explosive hazard.

2.0 PREVIOUS INVESTIGATIONS

2.1 Corps of Engineers Investigations

The Los Angeles District prepared a DERP FUDS Inventory Project Report (INPR) for Borrego Springs, Borrego Springs, California Site No. J09CA7011 on 17 July 1994 (document F-1). This INPR consists of a site survey summary sheet, a Findings and Determination of Eligibility (FDE), and project summary sheets for six separate projects.

TABLE 2-1

DERP FUDS PRELIMINARY ASSESSMENT PROJECTS

Project DERP Present

Number Cateqory Location

J09CA701101

CommentsPhase

MMRP 33 0 22' 37"N

Artillery

Naval/Mech.SI 116 0 16' 12"W

(Impact/Buffer) J09CA701102 MMRP SI Camp Ensign 33 0 11 ' 45"N

Cantonment 116 0 09 ' 52"W Area, Dumpsite

J09CA701103 33 0 20' 10"N

Dry Lake

MMRP EECA Navy Clark's 116 0 17' 20"W

J09CA701104 MMRP 33 0 OS' 30"N

Emergency

SI Target Area and 116 0 06' 01"W

Landinq Field

J09CA701105 MMRP 33 0 12' 08"N

Wash Navy MilitaryS1

116 0 09 ' 24"W

J09CA701106 MMRP 33 0 09' 04"N

Target/Safety Practice BombS1

116 0 08' 09"W Zone

2.2 Other Investigations

2.2.1 Archaeological Site Survey Reports for the

Former Borrego Maneuver Area were prepared from August 1983 to September 1989 by Robert S. Bergole, a volunteer archaeologist for the Anza-Borrego Desert State Park (document F-2). Some of the features, such as bulldozed mounds were not visible at the time this site visit was made. Mr. Bergole also speculates widely on the purpose of the features noted in the reports.

2.2.2 A final report entitled ~Recent Military

Operations in the Anza-Borrego Desert State Park" was completed 31 October 1991 and revised January 1992 by

F.L. Orell for the Anza-Borrego Desert Natural History Association (document F-3). A description of debris and man made artifacts found in this area are included, but again, there is a great deal of admitted speculation as to their original use.

3.0 PROPERTY DESCRIPTION

3.1 Location

it, Military Wash, or lies three miles almost due Bor Wash as the Navy called north of Ocotillo Wells and rego

Benson's Dry Lake in San Diego County, California (plate 2)

TABLE 3-1

I

MRS

Area A

Former Usage

Target Area

CURRENT

Present

Owner State of

California

LAND USAGE

Present

Usage Nature Area

Anza-Borrego Desert State

Size/ Acres

Comments See Plate 2

I

Park B Remaining

Lands State of

California Nature Area

Anza-Borrego Desert State

215 See Plate 2

Park Total Acreage 1675

3.2 Prior Land Use

Prior to Naval use, the property was owned by the State of California, Division of Beaches and Parks and was a part of Borrego Desert State Park (documents F-3 and F-8) .

3.3 Existing land Use and Ownership

All of the land affected by Naval use in Military Wash is owned by the State of California and is a part of the Anza-Borrego Desert State Park (Map H-6). This is not likely to change in the future.

3.4 Climatic Data

A part of the Colorado Desert System, the Borrego Desert is one of the hottest places in the United States. The average annual maximum temperature is 87.5° Fahrenheit (F) with average high exceeding 100°F during the months June, July, August, and September. The annual average minimum temperature is 58.2°F, but even in the coldest months the average is above freezing. Average annual rainfall is only

5.94 inches. January and February are the only months where the average rainfall exceeds 1 inch (reference B-27) .

3.5 Topography

The subject property is a fairly level desert wash. Vegetation is extremely sparse and low growing consisting of mostly creosote brush and tufts of desert grasses(Photographs L-1, L-2, L-5, L-6, and L-7).

3.6 Geology and Soils

3.6.1 Quaternary alluvial, lacustrine, and eolian

deposits predominate in this area, which is a gently sloping alluvial fan. The Borrego Valley is aligned northwest along the San Jacinto and Coyote Creek faults. The largest earthquake to hit in historic times was the 9 April 1968.

measured 6.4 on the Richter Scale with an epicenter near Borrego Mountain (reference B-28) .

It

3.6.2 The soil is mostly Typic Torrifluvents on

younger alluvial fan and is composed of cobbly fine sandy loams over fractured mica schist. The soil is excessively a drained and soil temperature regimes are hyperthermic. Soil temperature regimes are aridic (reference B-29) .

3.7 Hydrology

3.7.1 The groundwater basin is an alluvium-filled

valley underline by crystalline bedrock. The valley fill consists of three aquifers: upper, middle, and lower. The upper aquifer is comprised of Holocene to Pleistocene age alluvial, fan, playa, and eolian deposits. The unit ranges to 1,000 feet thick at the north end of the basis. Specific yields for these deposits range from 15 to 25 percent. This aquifer is the principle source of groundwater in Borrego Valley and well yields are as much as 2,000 gallons/minute (reference B-30). However, the closest well to the site is more than five miles away in the Ocotillo Basin. This well, identified as state well number 12S09E2D001S, has a depth to groundwater in excess of 210 feet (reference B-31). The middle and lower aquifers are Pleistocene age continental deposits, including moderately consolidated sand, gravel, and boulders. Thickness ranges to 700 feet in the middle aquifer and is thickest near the center of the valley, but thins towards the southeast. The lower aquifer reaches 1,800 feet thick in the south-central part of the valley. Specific yield ranges from 5 to 10 percent in the middle aquifer and 1 to 5 percent in the lower aquifer. Groundwater generally flows southeast through the valley (reference B-30) .

3.7.2 There is no surface water on the property.

Runoff is rapid from alluvial fans and slow from basin floor.

Drainage is to the Salton Sea. Streams have no water in some years and are dry most of each year in other years. There is temporary ponding on playas, or dry lake beds, in some years (reference B-29) .

3.8 Natural Resources

Mr. Hollenbeck is the Ecological Resources Manager for Ocotillo Wells State Vehicle Recreation Area (SVRA). He stated that there are no cultural or historical resources in this particular area other than the remains of the bombing and strafing targets and the rake stations. He further stated that there are no Federally listed protected species. There are, however, two California Species of Concern reptiles, the Flat Tailed Horned Lizard (Phrynosoma mccaullii) and the Colorado Desert Fringe Toed Lizard (Uma notato). In addition, the California Native Plant Society lists two species of concern: Orchatts Woody Aster and Pyllostyles thurberri, which is a parasite of the dye plant (interview 1-3) .

3.9 Historical/Cultural Resources and Demographics

3.9.1 Other than the remains of the bombing and

strafing targets, no historical or cultural resources were noted in the Archaeological Survey of this area performed by the Anza-Borrego Desert State Park (document F-2)

3.9.2 The area itself is uninhabited. The

surrounding area has a population density of 6.5 persons per square mile outside of the state park lands. The nearest town of any size is Borrego Springs, with a population of 2,854 (reference B-32) .

4.0 HISTORICAL PROPERTY SUMMARY

4.1 Chronological Property Summary

4.1.1 A letter dated 13 March 1941 from E.L.

Gunther, Commanding Officer (District Air Officer, u.S. Naval Air Station, San Diego, California lists Borego Wash as a horizontal bombing target, only. It also states that the property is leased by the Navy (document F-4) .

4.1.2 The Navy applied to the California State

Commission for Beaches and Parks to use the area for "aircraft training purposes for a period of one year from November 3, 1941." The petition was acted upon at the Commission meeting of April 19 and 20, 1941 when it was unanimously approved without recorded discussion (document F-3) .

4.1.3 On 3 November 1942, Permit No.

NA11/N19(390224)U from the State of California, Division of

Parks and Beaches, was issued to the Department of the Navy.

This permit was for the use of 640 acres of land. This area was further identified as Section 20, Township 11 South, Range 8 East, San Bernardino Base and Meridian. The official designation of this area was Target 64, Borrego Wash (document F-8) .

4.1.3 The permit issued on 3 November 1942 was

cancelled by the Navy in a letter identified as BuDocks ltr NDll/NI-13, X5-4-NI-2, F-5-3/WWB:mr of 15 Apr 1947. A copy of this letter has not been located, but apparently the site was considered excess to the needs of the Navy. The situation changed quickly and on 30 April 1947 it was requested that Target 64, Borrego Wash be reactivated (document F-8).

4.1.4 In September 1953, the Navy began

decontamination of Target 64, Borrego Wash, and on 22 January 1954 certificates of decontamination were issued to private landowners within a 4,500-foot radius of the target. It is also alluded to that the target was decontaminated sometime prior to 30 April 1945 (document F-9). No further Department of Defense use is known

4.2 Historic Military Munitions Usage

4.2.1 As stated previously, document F-4 states

that Borrego Wash in 1941 was to be used as a horizontal bombing target only. However, document F-5, dated 24 August 1944 describes the target as consisting of concentric circles with an adjacent airplane silhouette for strafing. It further states that the target was for high altitude and dive-bombing and the type of ordnance used was practice bombs and strafe.

4.2.2 In the decontamination of the lands

surrounding the target large numbers of .50 caliber and 20 millimeter inert projectiles were found (document F-9).

4.3 Potential Features of Environmental Interest

No other eligible areas of potential environmental interest were noted.

4.4 Map Analysis

4.4.1 Maps H-l and H-2 both show the bomb target in

the same location. However, Section 20 has never been actually surveyed and its location is by projection. Map H-3 labels the target as "Borego Wash BTu, but shows no further details.

4.4.2 A detail in Map H-4 shows a danger area for

pilots approximately centered on Target 64, Borrego Wash. The borders shown for Ocotillo Wells SVRA in Map H-5 are very inaccurate and this map was only included to show the trails leading to the site. The correct borders are shown in Map H-6. The entire site is within the borders of Anza-Borrego Desert State Park.

4.5 Aerial Photo Interpretation

Only one aerial photograph, dated 16 June 1996 was available for study. So little remains of the site that any interpretation from a single photograph taken so long after use of the site is mostly a matter of conjecture, however, the major features are labeled (document 8-1)

4.6 Interviews

4.6.1 Ms. K. Eastman is the State Park Ranger

assigned to patrol that area of Military Wash Road within Ocotillo SVRA. Although Ranger Eastman is aware of the site, she has only been there for a year. She is not aware of any reports of MEC in the area (interview I-I) .

4.6.2 Mr Mark C. Jorgensen is the Superintendent of

Anza-Borrego Desert State Park. Mr. Jorgensen has worked at the park for 32 years and has lived in the area most of his life. Mr. Jorgensen stated that as the area is all state land and his rangers are law enforcement personnel, any incidents involving Military Munitions of Concern would be reported directly to 710 t h Ordnance Co. (EOD). Local municipal and county authorities are not involved. Mr. Jorgensen stated that he remembers as a teenager scouring the area and finding .50-caliber ammunition, which he would link into belts.

However, that was many years ago. He stated that although links can be found in the area, it has pretty well picked over in the intervening years and he cannot recall any incidents of Military Munitions of Concern being found in Military Wash (interview 1-2) .

4.6.3 Mr. Erik Hollenbeck is the Ecological

Resources Manager for Ocotillo Wells SVRA. He stated that there are no cultural or historical resources in this particular area other than the remains of the bombing and strafing targets and the rake stations. He further stated that there are no Federally listed protected species (interview 1-3) .

5.0 PROPERTY ELIGIBILITY

5.1 Confirmed FUDS

A total of 400 square miles were identified as eligible in the INPR. No acreage was assigned to this individual project. However, at total of 1,675 acres are involved in this project (plates 1 and 3) .

5.2 Additional Confirmed FUDS Acreage

No additional acreage was identified.

5.3 Potential FUDS

No Potential Formerly Used Defense Sites were identified.

6.0 VISUAL PROPERTY INSPECTION

6.1 General Procedures and Safety

6.1.1 On 9 June 2004, members of the Preliminary

Assessment team traveled to the Borrego Springs Navy-Military Wash site located in San Diego County, California. The primary purpose of the PA team was to assess the MEC presence or potential of these areas. The inspection was limited to non-intrusive methods; e.g., subsurface sampling was not authorized nor performed.

6.1.2 A site safety plan was developed and utilized

by the SI team to assure safety from injury during the inspection of this site (appendix J). A safety briefing which stressed safety and that military munitions should only be handled by military EOD personnel was conducted prior to the inspection for all personnel attending the on-site inspection.

Site safety was maintained at all times by the inspection team during the on-site inspection.

6.1.3 Prior to the site visit, a thorough review of

all available reports, historical documents, texts, and technical ordnance reference materials gathered during the historical records search portion of the PA was made to ensure awareness of potential ordnance types and hazards.

6.1.4 The site inspection consisted of a vehicle

and foot search of the site. The primary focus of the site visit was to locate evidence of MEC surface presence or a potential MEC burial site.

6.2 Property Inspection Synopsis

6.2.1 At approximately 0830 hrs, 9 June 2004, the

Property Inspection (PI) Team met with Calvin Cox, Project Manager for Los Angeles District, at the Ocotillo Wells SVRA ranger station. Following the directions of Superintendent Jorgensen, we proceeded in two vehicles to the site as follows: on Quarry Road to Shell Reef Expressway to Fault Wash to Military Wash. All of these are simply paths in the sand, but the intersections are marked with signage. Shortly after crossing the marked border between Ocotillo Wells SVRA and Anza Borrego State Park, the team came upon the remains of a collapsed Rake Station (photograph L-3). The vehicles were parked at this location and the team proceeded on foot for the remainder of the visit.

6.2.2 Using a hand-held Magellan GPS 2000 set for

NAD 27, the team set out for the historical coordinates given for the target: 33 0 II' 45"N 116 0 09' 15"W. Upon arriving at the coordinates, which were southwest of the rake station, very little was observed in the area (photograph L-1). There were a few scattered .50 caliber links and the remains of one M38A2 practice bomb, but nothing like would be expected at the center of a bombing target (photographs L-12 and L-15). It was determined after reviewing the remaining features that the bombing target center was actually located north of the first rake station (photographs L-2 and L-5) .

6.2.3 North of the bombing target and running in a

straight east-west line for approximately a mile is raised area in the wash. This feature has been the source of much speculation in post-use documents as to its purpose. It has been referred to as a "railroad" for towing targets. A close examination reveals that the "ties" are actually the remains of empty artillery ammunition boxes placed every two feet.

Most of the boxes above ground have been burned, most likely due to wild fires to which the area is prone. Nothing remains but the nails and a few bits of wood (photographs L-6, L-7, L 8, L-9, and L-10). It is the conclusion of the site investigation team that this feature was most likely a simulated railroad used for strafing.

6.2.4 A second rake station was noted to the west

and north of the first (photograph L-4). Both rake stations are slightly elevated above and on the edge of the wash in which the bombing target and "railroad" are located. The columns supporting the roofs have collapsed.

6.2.5 Throughout the area are expended munitions, none of which appear to contain energetic elements. The high alkali content of the soil has caused the cast iron miniature practice bombs to fracture into small pieces (photographs L II, L-12, L-13, L-14, L-16, L-17, and L-18) .

6.2.6 The sum total of metal items on the site, including the nails would probably not fill a 55-gallon drum.

7.0 PROPERY MEC/RCWM TECHNICAL DATA

7.1 MEC Technical Data

Table 7-1 is a listing of ammunition and explosive fillers that were used or present at one time at Borrego Springs Navy-Military Wash. Table 7-2 is a summary of site ordnance fillers that has been developed based on Table 7-1.

These tables are based on review of historical documentation and specifications listed in Appendix E. Tables 7-1 and 7-2 do not indicate a current presence but are only a listing of ordnance that had been present at Borrego Springs Navy Military Wash and are included for reference purposes only.

TABLE 7-1

AMMUNITION USED AND EXPLOSIVES/CHEMICAL FILLER

ITEM

Small Arms Ammo .50 Cal with gilding metal jacket

Propellant

Primer

I

MODEL/TYPE I FILLER/ I FUZE

WEIGHT

M2 Ball Soft Steel N/A Ml Tracer Tracer MlO Tracer Composition

Tracer Composition double base (DB) powder

Primer composition

Cartridges, 20MM Mk l/M55/M99, TP Soft Steel N/A

Bomb, Practice, 3 lb AN-MK 23 w/signal

Signal AN-MK 4 Mod 4

Inert (cast N/A iron)

Smokeless Powder Zinc Oxide

AMMUNITION

TABLE 7-1

USED AND EXPLOSIVES/CHEMICAL FILLER

ITEM

I

MODEL/TYPE I FILLER/ I FUZE

WEIGHT

Bomb, Practice, 100 lb w/spotting charge

Rocket, 2.25-inch, SCAR

Rocket, 5-inch, Aircraft, HEAT

M38A2 80 lbs. N/A M1A1 Sand

3D-cal.

blank cartridge Inert (sand filled) 3 lbs.

black powder

Mk 2, Mk 3

Complete assembly Mk 32 Mod 1 Head Mk 25 Mod 1 Motor Mk 10 Mods

Inert N/A (Solid)

1. 8 lbs Propellant Nonsolvent Double base

1. 503 lbs.

Mk 149

7.5 lbs.

CaMP B

23.9 lbs.

Nonsolvent Doublebase

7.2 Munitions Constituents

Based upon Table 7-1, the munitions constituents are presented in Table 7-2. None of the constituents are listed by Chemical Abstract Service Registry Number (CASRN) in 40 CFR

302.4 except for nitroglycerine as found in rocket propellant and small arms propellant. However, this would have been consumed in the use of the rockets and the projectiles when fired from the aircraft.

TABLE 7-2

CHEMICAL DATA OF MUNITIONS CONSTITUENTS

Filler Synonym(s) Chemical Formula

CASRN

Black Powder Sodium Nitrate Black powder 73% Sodium Nitrate 11% Sulfur 16% Charcoal

NaN03

S

7631-99-4 7704-34-9 7440-44-0

CHEMICAL

Non solvent Doublebase

COMP B

Double Based Powder

Zinc Oxide Tracer Composition R-256

TABLE 7-2

DATA OF MUNITIONS CONSTITUENTS (cont.)

Rocket propellant Double Based powder 56.5% Nitrocellulose 28% Nitroglycerin 11% Dinitrotoluene 4.5% Ethyl centralite .5% Carbon black (added) 1.5% Potassium sulfate (added) .08% Candilla wax (added) (B-35) None

60% RDX

39% TNT

Smokeless Powder 74.4% Nitrocellulose 15% Nitroglycerine 0.75% Diphenylamine 0.25% Graphite (B 34) None

8.3% Calcium Resinate 26.7% Strontium Peroxide 26.7% Magnesium Powder 33.3% Strontium Nitrate

C6HaN20g

CH2N03CHN03CH2N03

CH3C6H3(N02) 2

C17H20N20

C

Unspecified

C3H6N606

CH3C6H2(N02) 3

C6HaN20g

CH2N03CHN03CH2N03

(C6Hs ) 2NH

C

ZnO

Mg

Sr (N03 ) 2

9004-70-0 55-63-0 121-14-2 85-98-3

1333-86-4

7778-80-5

None

121-82-4 118-96-7

9004-70-0 55-63-0 122-39-4 7782-42-5

1314-13-2

9007-13-0

1314-18-7

7439-95-4

10042-76-9

8.0 EVALUATION OF MEC/RCWM PRESENCE

8.1 General Evaluation of MEC/RCWM Presence

8.1.1 Each MRS was evaluated to determine

confirmed, potential, or lack of MEC presence.

8.1.2 Confirmed MEC presence is based on

verifiable historical record evidence or direct witness of MEC items with explosive components since MRA closure. Additional field data are not needed to identify a confirmed MRS.

8.1.1.1 Verifiable historical record evidence

is based on MEC items located on site since site closure and documented by: historical records (archive records, Preliminary Assessment Reports, Site Investigation Reports) , local fire departments and law enforcement agencies/bomb squads, military Explosive Ordnance Disposal (EOD) Units, newspaper articles, photographs, or maps.

8.1.1.2 Direct witness of MEC items consists

of the site inspection team(s) and other credible witnesses as determined by the PA Team Leader (landowners, workers on-site, soldiers who served there, etc.) verifying that they have seen MMRP presence on the surface or subsurface since MRA closure.

8.1.3 Potential MEC presence is based on a lack

of confirmed MMRP presence. Potential MEC presence is inferred from records, present day site features, non-verifiable direct witness, or indirect witness.

Additional field data is needed to confirm potential MEC sites.

8.1.3.1 Inference from historical records is

based on no MEC items reported on the MRA since closure and would include documentation (records, aerial photographs, maps) indicating possible MEC/MPPEH presence derived from common practice in production, storage, use, or disposal at that time and from records indicating known MMRP usage.

8.1.3.2 Inference from present day site

features would be the indication of possible MEC presence from such obvious features as target circles, depressions, mounds/backstops, OB/OD areas/pits, etc.

8.1.3.3 Indirect witness would be people who

have stated that they have heard of MEC presence on the MRA (hearsay evidence) .

8.1.3.4 Presence of munitions debris, i.e.

MPPEH, that has not been certified as free of explosives is considered to be potential MEC presence.

8.1.4 MRA with no MEC presence areas are based

on a lack of confirmed or potential MEC evidence. All historical records, evidence, and present day site inspections do not indicate confirmed or potential MEC presence. There is no reasonable evidence, either direct or inferred, to suggest present day MEC presence. Additional field data is not needed to assess no MEC presence areas.

8.1.5 No evidence was developed to suggest any

RCWM was ever present at the site.

8.2 Property-Specific Locations

8.2.1 MRS A: Target Area

This area is considered to have a confir.med MEC presence. This is based on the two 5-inch rocket warheads found in 1996 (document F-10).

8.2.2 MRS B: Remaining Land

This area is considered to have no MEC presence.

This is the remaining area of Section 20. It is more than 4,500 feet from the target and there have been no reports of MEC since MRA closure. No MPPEH has been observed in this area.

9.0 PATHWAY AND ENVIRONMENTAL HAZARD ASSESMENT

9.1 Groundwater Pathway

9.1.1 Hydrogeologic Setting. There are no wells on

the MRA, and there are no wells within a four-mile radius of MRS A: Target Area.

9.1.2 Groundwater Targets. The groundwater is not

directed towards any drinking water wells within a four-mile radius. There are no drinking water wells within a four-mile radius.

9.1.3 Groundwater Conclusions. As the groundwater

flowing from the MRA is not directed toward any drinking water, and there are no secondary targets, the groundwater pathway is not a concern.

9.2 Surface Water Pathway

9.2.1 Hydrologic Setting. The area is desert and

dry. There is runoff to the southeast on those rare occasions when precipitation falls.

9.2.2 Surface Water Targets. There are no intakes

from surface waters within 15 miles of the MRA.

9.2.3 Surface Water Conclusions. There are no

surface water concerns at this MRA.

9.3 Soil Exposure and Air Pathways

9.3.1 Physical Conditions. MPPEH are known to be

present on the surface so there is a possibility of a soil exposure or air pathway being present.

9.3.2 Soil and Air Targets. Vehicle traffic of

visitors to the park is limited to marked routes and street legal vehicles. Visitors to this remote area are rare.

9.3.3 Soil Exposure and Air Pathway Conclusions.

The lack of targets would make soil exposure and air pathway concerns minimal at this site.

10.0 SUMMARY OF MMRP AND HTRW

10.1 Summary of MMRP Findings. MRS A: Target Area has a

confirmed MEC presence. MRS B: Remaining Lands has no MEC presence. MRS B: Remaining Lands has no MMRP concerns, either from MEC or MPPEH.

10.2 Summary of HTRW Findings. Nitroglycerin was present

in the propellant used for .50 caliber and 20-mm ammunition and in rocket grains. However, this would most likely have been consumed during the use of these munitions.

Diphenylamine is a very small constituent of the propellant used in .50 caliber and 20-mm ammunition. Again, this would most likely have been consumed during the use of these munitions. RDX and TNT may be present in a containerized condition if any 5-inch rocket warheads, such as those found in 1996, remain on the MRA. The standard for soil for RDX and TNT are <400 mg/kg and <1500 mg/kg respectively. Deflagration of these constituents leads to only gaseous products so it is extremely unlikely that either of these would be present in the soil at these levels. As this MRA was only supposed to be used for practice ammunition, the presence of the rocket warheads may have been an aberration.

11.0 RECOMMENDATION

11.1 A site investigation should be performed on MRS A:

Target Area.

11.2 The assessment team believes that No Further DoD

Action is Indicated (NDAI) for MRS B: Remaining Lands.

11.3 In the area of HTRW, the assessment team believes

that No Further DoD Action is Indicated (NDAI).

APPENDIX A

REFERENCE SOURCES

e e e

The following organizations and personnel are acknowledged for their support

Organization Name Telephone Nature of Support

GOVERNMENT

FEDERAL AGENCIES

Department of Defense

Defense Technical Information Computer Search (703) 427-8274 No Relevant Information Center and Secure Stinet (DTIC/STINET) (DTIC) 8725 John J. Kingman Road (703) 767-8228 Suite 0944 (STINET) Fort Belvoir, VA 22060-6218

DoD Explosives Safety Board Computer Search (703) 325-1369 No Relevant Information 2461 Eisenhower Ave. (DDESB) Alexandria, VA 22331-0600

710 t h Ordnance Company (EOD) Staff (619) 553 -7291 No record of responses to site, Naval Submarine Base San Diego (619) 553 -7293 but records only extend back P.O. Box 6376 two years.

San Diego, CA 92166

U.S. Army Center Of Military Staff (202) 685-2733 See Appendix B, Section II, History DSN (325) Parts A and B

103 Third Ave.

Ft. Mcnair, DC 20319-5058

USACE, Office Of History Staff (703) 428-6554 See Appendix B, Section II, Humphreys Engineer Center Parts A and B

ATTN: CEHO-ZA

7701 Telegraph Road Alexandria, VA 22315-3865

JMC History Office George Eaton (309) 794-1450 No Relevant Information

ATTN: AMSJM-PA (HISTORY)

Bldg. 390 Rock Island, IL 61299

Rock Island Arsenal Museum Kris Leinicke (309) 782-5021 Technical Manuals

ATTN: SIORI-CFS-M FAX 782-3598

Bldg. 60 Rock Island, IL 61299-5000

GOVERNMENT

Army (cont.)

U.S. Army RDECOM

ATTN: AMSRD-SCI-H

5232 Fleming Road

APG, Aberdeen, MD 21010

U.S. Army Military History Institute Reference Library

22 Ashburn Drive

Carlisle Barracks

Carlisle, PA 17013-5008

Institute Archives Branch

Carlisle, PA 17013

Institute Photo Archives

Carlisle, PA 17013-5008

U.S. Army Ordnance Museum

Bldg. 2601, Aberdeen Blvd

APG, MD 21005-5201

USACE, Los Angeles District

Cadastral Branch

915 Wilshire Boulevard

Los Angeles, CA 90017-3401

Real Estate Division

Kathleen Ciolfi

Louise Friend John Slonaker

David Keough

Mike Winey

Dr. Atwater

Richard Nagle Armando Moneu

Delores Henderson

Gill Gonzalez

(410) 436-4430

DSN 584-4430

(717) 245-3103

DSN 242-3103

Fax DSN 242

(717)

DSN

(717)

DSN

(410)

DSN

(213) (213)

(213)

(213)

245-3189

242-3189

245-3434

242-3434

278-3602

298-3602

452-3137

452-3138

452-3165

452-3719

No Relevant

No Relevant

No Relevant

No Relevant

No Relevant

No Relevant

No Relevant

INPR

Information

Information

Information

Information

Information

Information

Information

DERP/FUDS

GOVERNMENT

Army (cont.)

MANSCEN Library Dr. Wright (573) 563-4109 No Relevant Information 597 Engineer Loop Base Historian DSN 676-4109 Bldg. 3202, Suite 200 Fort Leonard Wood, MO 65473

Air Force

(AFHRA) Joe Caver (334) 953-5834 No Relevant Information Air Force Historical Research Agency Research Divison 600 Chennault Circle Bldg 1405 Maxwell AFB, AL 36112-6424

(AFHRA) IRIS System (334) 953- No Relevant Information Air Force Historical Research Sheila Roten 6884/2439

Agency IRIS Microf ilm FAX 953-7428 Information Systems Division Essie Roberts DSN (493) 600 Chennault Cir, Bldg. 1405 Maxwell AFB, AL 36112-6424

Air University Library Staff (314) 953-2888 No Relevant Information 600 Chennault Cir., Bldg. 1405 DSN 493 Maxwell AFB, AL 36112-6424

Marine Corps Historical Center Staff (202) 433 -3447 See Appendix B, Section II, Washington Navy Yard DSN 288-3447 Parts A and B 901 M St., SE washington, DC 20374-5040

Naval Construction Battalion Brian Thompson (80S) 982-1124 No Relevant Information Center (NCBC) DSN 551 Technical Information Center

ATTN: CODE 72

1100 23 r d Ave.

Port Hueneme, CA 93043

Organization

Navy (cent.)

Naval Construction Battalion Center (NCBC)

NAVFAC Historian Office CB Logistics Center, CODE 09

(BLDG 99)

4111 San Pedro Street Port Hueneme, CA 93043

Naval Historical Center Washington Navy Yard Navy Department Library 901 M St., SE Washington, DC 20374-5060

Naval Historical Center Washington Navy Yard Naval Aviation History Branch 901 M St., SE Washington, DC 20374-5060

Naval Historical Center Washington Navy Yard Operational Archives 901 M St., SE Washington, DC 20374-5060

NAVEODTECDIV

Technical Library 2008 Stump Neck Road Indianhead, MD 20640-5070

U.S. Naval War College Archives

686 Cushing Rd.

Newport, RI 02841-1207

U.S. Naval War College Library 686 Cushing Rd.

Newport, RI 02841-1207

Name

GOVERNMENT

Carol Marsh Gina Nichols

Staff

Staff

Staff

Dawn Risko

Dr. Evelyn Cherpack

Alice Juda Maggie Rauch

Telephone

(805) 982-5563

DSN 551-5563

(202) 433-4132

DSN 288-4132

(202) 433-4407

DSN 288-4407

(202) 433-2833

DSN 288-2833

(301) 743 -6834

(401) 841-2435

(401) 841-4551

Nature of Support

No Relevant Information

See Appendix B, Section II, Parts A and B

See Appendix B, Section II, Parts A and B

See Appendix B, Section II, Parts A and B

No Relevant Information

No Relevant Information

No Relevant Information

Organization

Navy (cont.)

Name Telephone

GOVERNMENT

Nature of Support u.S. Naval War College Museum 686 Cushing Rd.

Newport, RI 02841-1207

Tony Nicolosi Bob Cembrola

(401) 841-4052 No Relevant Information

National Archives and Records Administration

NARA-Archives I Old Military And Civil Textual Division

Pennsylvania Ave. and 7t h St Nw Washington, DC 20408

Staff (202 ) (202 ) (202 )

208-1903 219-6273 208-0370

See Appendix B, Parts A and B

Section II, National Archives, Archives II (Cartographic/Architectural) 8601 Adelphi Road College Park, MD 20740

Staff (301 ) 713-7040 See Appendix B, Parts A and B

Section II, National Archives, Archives (Motion Picture, Sound, And Video Branch)

8601 Adelphi Road College Park, MD 20740

II Staff (301 ) 713-7060 See Appendix B, Parts A and B

Section II, National Archives, Archives (Still Picture Branch)

8601 Adelphi Road College Park, MD 20740

II Staff (301 ) 713 -6660 See Appendix B, Parts A and B

Section II, National Archives, Archives (Textual Branch) 8601 Adelphi Road College Park, MD 20740

II Staff (301 ) 713 -7250 See Appendix B, Parts A and B

Section II, National Personnel Records Center

9700 Page Ave.

St. Louis, MO 63132-5100

Wilson Sullivan John Daly

(314) 538-4085 See Appendix B, Parts A and B

Section III, National Archives and Records Administration (cont.)

NARA-Pacific Region Bill Doty (949) 360-2641 See Appendix B, Section III, (Laguna Niguel) Paul Wormser Fax 360-2624 Parts A and B

24000 Avila Road P.O. Box 6719 Laguna Niguel, CA 92607

NARA-Pacific Region John Hedger (650) 876-9018 See Appendix B, Section III, (San Francisco) Robert Glass Fax 876-0920 Parts A and B.

1000 Commodore Drive San Bruno, CA 94066-2350

Washington National Records Staff (301) 457-7190 See Appendix B, Section III, Center Parts A and B

4205 Suitland Road Suitland, MD 20409

Library of Congress

Library of Congress Staff (202) 707-5522 See Appendix B, Section II, Geography And Map Division Parts A and B 101 Independence Avenue SE Washington, DC 20536

Library of Congress Staff (202) 707-5000 See Appendix B, Section II, Prints And Photographs Parts A and B Division

101 Independence Avenue SE Washington, DC 20540-4650

Department of the Interior

NOAA Staff (828) 271-4800 Information on climatic data of National Climatic Data Center Press 2 California.

151 Patton Avenue, Room 120 Fax 271-7627 Asheville, NC 28801-5002

The following organizations and personnel are acknowledged for their support

Organization

State

California State Archives 1020 0 Street Sacramento, CA 95814

Name

Mr. Metzer

Telephone Nature of Support

GOVERNMENT

(916) 653-2246 No Relevant Information

California State Library California History Section 914 Capital Mall, Library and Courts Building

Sacramento, CA 94237-0001

State Historical Preservation Office (SHPO)

Office of Historic Preservation

Department of Parks and Recreation

P.O. Box 942896 Sacramento, CA 94296

California State Library Government Publications Section

4201 Sierra Point Drive Suite 112

Sacramento, CA 95834

John Gonzales Sybille Zemitis

Staff

Internet

(916) 654-0176 No Relevant Information Fax 654-8777

(916) 653-6624 Prior to any intrusive remedial activities on this site, contact with the State Historical Preservation Officer (SHPO) is required to obtain information regarding all locations of archaeological, historical, and cultural resources.

(916) 654-0069 No Relevant Information Fax 653-6114 organization Name Telephone Nature of Support

State (cont.)

Anza-Borrego Desert State Park Mark Jorgensen (760) 767-4962 Interview and Map.

200 Palm Canyon Drive Superintendent Borrego Springs, CA 92004

Ocotilla Wells SVRA K. Eastham (760) 767-5391 Interview and Map.

5172 Hwy 78 Ranger Ext. 314 P.O. Box 360 Borrego Springs, CA 92004

NON-GOVERNMENT

National

FirstSearch Computer Search (918) 420-8771 No Relevant Information 6565 Frantz Road Dublin, OH 43017-3395

Coast Defense Study Group Mark Berhow (309) 794-5163 No Relevant Information 1560 Somerville Road Bel Air, MD 21015

Council on America's Past Heliogram (800) 396-4693 No Relevant Information 518 West Why Worry Lane Publication Phoenix, AZ 85021

Scientific & Technical Computer Search (918) 420-8771 No Relevant Information Information Library System (STILAS) DSN 956-8771

Defense Ammunition Center John L. Byrd Jr. Technical Library

ATTN: SIOAC-ESM

1 C Tree Rd McAlester, OK 74501-9002

APPENDIX B

REFERENCES AND ABSTRACTS

REFERENCES AND ABSTRACTS

TABLE OF CONTENTS

SECTION

SECTION

SECTION

I:

II:

III

BIBLIOGRAPHY

NATIONAL CAPITOL REGION RECORDS SEARCH

PART A:

PART B:

POSITIVE FINDINGS

NEGATIVE FINDINGS

REGIONAL NATIONAL ARCHIVES FINDINGS

PART A

PART B

POSITIVE FINDINGS

NEGATIVE FINDINGS

SECTION I: BIBLIOGRAPHY

8-1 Army Regulation (AR) 200 - 1, Environmental Quality, Environmental Protection and Enhancement, DAr 23 Apri l 1990 (not enclosed in this ASR) .

B-2 ER 200-3 -1, Environmental Quality, Formerly Used Defense Sites (FUDS) Program, 10 May 2004.

B-3 Site Safety Pl an for OEW Investigations, U.S. Army Corps of Engineers, Rock Island Dist r ict, dated 25 June 1992, W/ Appendix A-314.

B-4 Ordnance Data Sheets, U.S . Army Corps of Engineers r St. Louis District . (E-1, E- 2 , E - 3 , E-4, E-5, E- 7, and E-8)

B-5 Aerial Photograph, U.S. Geol ogical Survey, Acme Labs r h tt :/ / ma er.acme .com /?la t~33.201373&lon

116 .1S 979&scal e -ll , 16 June 1996. (F-1)

B- 6 Report of Availability of Inact ive Naval Air · e

Installations in the Eleventh Naval District, 29 March

1954, NARA II, RG 71, Entry 1001, Box 114.

B-7 Inactive Naval Air Installations in the Eleventh Naval

District; Report of as Excess, 2 August 1 955 r NARA II, RG 71, Entry 1001, Box 115.

8 - 8 Map, undated, showing World War I I era Eleventh Naval District Facilit ies, NAVFAC, San Bruno, CA. (H-1)

D-9 Map, Land and Sea Operating and Danger Areas r Southern Sector r Western Sea Frontier, Naval Air Control Center, San Diego, 1943, NARA, Pacific Region (Laguna Niguel) r RG 181, Box 50, Folder AS-I . (H-2)

8 -10 Let t e r, Congressional Inquiry Relative to Alleged Navy Contaminat .ion of Lands Owned by V. A. Pearl, 4 March 1 953, NARA, Pacific Region (Laguna Niguel), RG 181, Box 242 r Commandant's Office, Nl-1. (F-9)

B-ll Lett e r, Request for Reactivation of Target 64, Borrego Wash, 30 April 1947, NARA, Pacific Region (Laguna Niguel), RG 181, Box 561, Commandant's Office, QT. (F - 8 )

B-12 Defense Environmental Restoration Program, Formerly Used Defense Sites, Inventory Project Report, Borrego Springs, Borrego Springs, California, Site No. J09CA701100, U.S. Army Corps of Engineers, Los Angeles District, 17 January 1995. (F-l)

B-13 Teletype Message, Area and Target Assignments for the week of 19 Feb r ua r y 1945, 16 February 1945, NARA, Pacifi c Region (Laguna Niguel), RG 181, Box 66, Commandant's Office, General Correspondence, A5-6. (F-7)

B-14 Map, Location Map of Naval Reservations in San Diego, .Tmperia.l and Portions of Orange and Riverside Coun ties, California, Eleventh Naval District, San Diego, CA, 30 June 1942, NAVFAC Historian's Office, Port Hueneme, CA. (H-2)

B-1 5 Map, Local Aeronautical Chart, San Diego, U.S. Coast and Geodetic Survey, October 1948, NARA, Pacific Region (Laguna Niguel), RG 181, Box 119-4 181-04-001, Commandant's Office, General Correspondence, NI-9 1950. (H-4 )

B-16 Map, Ocotillo Wells State Vehicular Recreation Area, California Department of Parks and Recreation, OHMVR Division, October 2002. (H-5)

B-17 Map, Anza-Borrego Desert State Park, California State Parks, 200 3. (H··6)

B-18 Memorandum, Termination of use of the Borrego Maneuver Area by the Army, 7 October 1944, NARA, Pacific Region (Laguna Niguel), RG 181, Box 38, Folder A5-1 . (F-6)

B-19 Memorandum, Navy Operating Areas in Borego and Imperial Valleys , 13 March 1941, NARA, Pacific Region (Laguna Niguel), RG 181, Box 38 . (F-4)

8-20 Memorandum, Bombing Targets in Southern California Sector, Western Sea Frontier, 24 August 1944, NARA, Pacific Region (Laguna Niguel), RG 181, Box 38. (F-5)

B-21 Archaeologi cal Site Survey record Reports for the Former Bo r rego Maneuver Area, August 1983 to September 1989, State of California, Department of Parks and Recreation. (F-2)

B-22 Orell, F.L., Recent Military Operations in the Anza Borrego Desert State Pa r k, Final Report, 31 October 1991, Revised January 1992, Anza-Borrego Desert Natural History Association . (F - 3)

B-23 EPA/S40/G-91/013, Publication 9345.01-01A, Guidance for Performing Preliminary Assessments Under CERCLA, Envi ronrnental Prot.ect i o n Agency, September 1991.

B-24 Handbook on the Management of Or dn ance and Explosives at Closed, Transferring, and Transferred Ranges and Other Sites, Interim Final, Environmental Protection Agency, February 2002.

B-25 Archives Search Report, Findings for the…