BNA0397020 1 Hdmse00181527 NASA SURFACE Hpourdp'nts OPERATED by ROCKWELL/ ROCKETDYNE

Rocketdyne Divisio n Rockwell International Corporation 6633 Canoga Avenu e Rockwell Canoga Park California 91304 International

Telex : 696478 ROCKETDYN CNP K

4 April 1988 In reply refer to 88RC0358 1

Department of Health Services 107 South Broadway , Room 7011 Los Angeles , California 9001 2

Attention : Mrs . Susan Romero

Subject : Surface Impoundment Closure Plans

Gentlemen :

Per your request , this transmittal is to provide information that will assist in the approval of the surface impoundment closure plans submitted by Rockwell International Corporation, Rocketdyne Division . The items enclosed are : I (1) The completed Appendix H of the Environmental Information form received from DOHS .

(2) Groundwater quality summary tables and well proximity to the impoundment from the 1987 sampling of the Engineering Chemistry Laboratory ( ECL) wells by Rocketdyne ' s consultants , Groundwater Resources Consultants , Inc . (GRC) .

(3) Photographs ( 7) taken during your visit to the Santa Susana Field Laboratory on March 15, 1988 , while GRC sampled the Delta and Alfa Bravo Skim Pond ( ABSP) impoundments at places designated by DOHS . As you may remember , the exact locations were identified by a yellow streamer or white glove on a wooden stake so that the photographer could document the activities . The soil samples were then split between Rocketdyne and DOHS so that two sets of laboratory results would be obtained .

Very truly yours ,

ROCKWELL INTERNATIONAL CORPORATION Rocketdyne Division

S S . R . Laf'flam , Manager Environmental Unit Facilities & Plant Operation s

SRL/sj-0288 H

cc w/o enclosures : Suwan Sonkprasha, DOHS

E BNA0397020 1 HDMSe00181527 NASA SURFACE hPOURDP'nTS OPERATED BY ROCKWELL/ ROCKETDYNE

IMMIX B

vll~r rrAl. fl ATIQQ P E L (To Be Oi pleted By Applicant)

Date Filed March 30, 1988

General Information owned/operated by 1 . Name and address of developer or project sponsor .: Rockwell International C orporation, Rocketdyne Division, 6633 Canoga Avenue, Canoga Park, CA 91303 Area 11 at th e 2 . Address of project : Santa Susana Field Laboratory, top of Woolsey Canon Simi Hills, Assessorts Block and Lot Number: 685-0 (07-08- 10 ) CA 3 . Name, address , and telephone number of person to be contacted concerning this project : Steven R. Lafflam, Manager , Environmental Unit (818)700-57 05, Rocketdyne, 6633 Canoga Avenue, Canoga Park, CA 9130 3 4. Indicate number of the permit application for the project to which this I form pertains : Area II= CA1800 090010

I 5. List and describe any other related permits and other public approvals required for this project, including those required by city. regional, state and federal agencies : No city permits . Approvals required by the Re iona l Water Quality Control Board (L .A .) and Region Unntart =Michael Fernande) . Rnrketdyna hac NPDES,Permit CAD0U130ci fnr the SSEI Sit e All of the SSFL is in the Simi Hills of Ventura County, 6. Existing zoning district : and in the Santa Susana mountains_ it is listed as RASA, Rural Agricultural 5 acres, conditional use permiea 248 from Ventura County . 7. Proposed use of site (Project for which this form is )• Discontinue use . The project is to close five surface impoundments that are NASA-owned and Rockwell/Rocketdyne operated . Project Description

8 . Site size. Please see attached table .

9 . Square footage . Please see attached table .

10. Hamer of floors of construction . Does not apply.

il . tiant of off-street parking provided . Does not apply .

12. Attach plans . Please see attached information in the schedule under next item . 13 . Proposed scheduling . Please see attached schedule .

14 . Associated project . Does not apply .

15 . Anticipated incremental development . Does not apply .

16 . If residential , include the number of units, schedule of unit sizes, range of sale prices or rents, and type of household size expected . Does not apply . MHEV BNA0397020 2 HDMSeOOI81528 17. If oaaaercial , indicate the type, whether neighborhood , city or regionally oriented , . square footage of sales arm , and loading facilities . Does not apply. 18 . If industrial , indicate type, estimated employment per shift , and loading facilities . Aerospace operations ; 800 people @ SSFL/shift ; no loading facilities . 19. If institutional, indicate the major function, estimated employment per shift, estimated occupancy , loading facilities, and community benefits to be derived from the project. Does not apply .

20. If the project involves a variance , conditional use or rezoning applica- :tion, state this and indicate clearly why the application is required . Variance request has been submitted to the Department of Health Services . Are the following items applicable to the project or its effects? Discuss below all items checked yes (attach additional sheets as necessary) :

21 . Change in existing features of any bays , tidelands, beaches, or hills, or substantial alteration of ground contours .

22. Change in scenic views or vistas from existing residential areas or public lands or roads.

Z3. Change in pattern , scale or character of general area of X project.

24. Significant amounts of solid waste or litter. x

25 . C' ge in dust , ash, woke, fees or odors in vicinity. x

26 . Change in ocean, bay, lake , stream or ground water quality or x quantity, or alteration of existing drainage patterns .

27. Substantial change in existing noise or vibration levels in x the vicinity.

28 . Site on filled land or on slope of 10 percent or mare .

29 . Use of disposal of potentially hazardous t ;aterials, such as toxic substances, fla=ables or explosives .

30. Substantial change in denaiid for municipal services (police, fire, water, sewage , etc.) . x 31 . Substantially increase fossil fuel coas=ption (electricity, _ oil, natural gas, etc.) .

32 . Relationship to a larger project or series of p rojects . X

The larger project to which this is related is the groundwater remediation Environmental getting project for the entire SSFL site .

33 . Describe' the project site as it exists before the project , including information on topography, soil stability, plants and animals , and any cultural, historical or scenic aspects . Describe any existing structures on the The Hydrogeological Assessment Report describes this section in full . It has hPPn suhmit+.A +r hn+h the DOHS and the RWQCB . MflE E BNA03970203 HDMSe00181529 site, and the use of the structures . Attach photographs of the site . Snapshots or polaroid photos will be accepted .

34. Describe the surrounding properties, including information on plants and animals and any cultural , historical or scenic aspects. Indicate the type of land use (residential , commercial, etc . ), intensity of land use (one- family, apartment houses , shops, department stores , etc.), and scale of development (height, frontage , set-back , rear yard , etc .) . Attach photographs of the vicinity. Snapshots or polaroid photos will be accepted . Please see attached information .

Certif iration

I hereby ce rtify that the statements furnished above and in the attached ex- hibits present the data and information required for this initial evaluation to the best of my ability , and that the facts , statements , and in formation presented are true and correct to the best of my knowledge and belief .

March 30, 198 8 Date Signature S . R Lafflam, Manager For ROCKWELL INTERNATIONAL CORPORATIO N

(Note : This is only a suggested form . Public agenciess OEare free Sto devise their own format for initial studies .)

E BNA03970204 HDMSe00181530 Items 8 and 9

PROJECT DESCRIPTION

NASA SURFACE IMFOUNE[ IS AT SSFL

Surfac e Impoundmen t Nacre ( all located Area i n Capacity in in Area I ite Size Sq Ft Gallons

ABSP 75' x 295 ' 22,125 295,00 0

SPA-1 50' x 25 ' 1,965 41,300 diameter ( oval ) based on 5' depth

SPA-2 20' x 40' 800 18,000 (rectangle) based on 3' depth

DELTA 85 ' x 90' 7,650 572,000 based on 10' depth

PLF 34' x 20 ' 680 20,000 based on 7' depth

NASA-OWNED SURFACE IMPOUNI4EN S : TOTAL AREA IN SQUARE FEET = 33,220

M BNA0397020 5 HDMSe00181531 ENVIRONMENTAL INFORMATION Fie ITEMS 12 & 13 ROCKWELL INTERNATIONAL, ROCKETDYNE DIVISION ENVIRONMENTAL SURFACE IMPOUNDMENTS SSFL

FEB 1S T FY '88 WEEKS: :2 :3 :4 :5 6 :7 8 9 :10 : 11 :12 .1314'15 ] 6'1778'19'2 0 .21 .22 .23 .24 :25 :26 : 27 :28-:---29 :30 :31 : A R PREPARATION DRAT AP pROVAL* APTF/STL I V

FINAL DESIGN P2 BID AND AWARD P1 P2 CONSTRUCTIO N APt 2

ECL FINAL DESIGN Pt P 2 BID AND AWARD

CONSTRUCTION

DEFOLIATION DELTA ABSP STL4-2 17 • DIVERSION SYSTEM ABSP/DELTA • LINER REMOVAL SPA 1 & 2 PL F • SOIL REMOVAL (IF REQUIRED)

• Advanced Capital Funds Approved July Mileston e ISSUE DATE : 2-22.88 Qi Design Revie w REV DATE : 3-25-88 P1 - P2 Phase 1 & 2 O Meeting DOHS/EPA 88RC03581 Item #34 April 4, 198 8

DESCRIPTION OF THE SSFL ENVIRONMENT1

This section provides basic information conce rning the physical , biological, and cultural environment of the Santa Susana Field Laboratory (SSFL ) facility . The surface impoundments are situated in the midst of the 2600-acre site which is located in the Simi Hills of southeastern Ventura County . It is about 29 miles northwest of downtown Los Angeles . The nearest communities are in the Simi Valley , about 3 miles north of the site, and east of the Sa n Fernando Valley , via Woolsey Canyon Road to the flatlands below .

DEMOGRAPH Y

Approximately thirty thousand people live within a five -mile radius of the SSFL facility, and the nearest resident lives within a mile .

LAND USE

The SSFL site is located at the west end of the San Fernando Valley . The Valley has been intensely farmed since the Los Angeles Aqueduct was completed from Big Pine in 1913 . The abundant irrigation water provided by the aqueduct was at first used primarily for citrus orchards and truck farms . According to a vegetation map drawn in 1931 of western Los Angeles County and southeastern Ventura County ( Fig . 2 .4 ), the area at that time consisted of about 31% farm and urban land . It is apparent from the map that almost all this land exists in the San Fernando Valley .

Residential developments , particularly after World War II, have steadily replaced farmland in the Valley . Today the Valley ' s land use is primarily residential covering about 65% of the area ( Table 2.4) . Only a few truck farms remain ( Table 2 .4) .

The SSFL is located in southeastern Ventura County near the crest of the Simi Hills at the western border of the San Fernando Valley . The Simi Hills have never supported intensive farming or development because the terrain is too rugged and rocky . Today , about 73% of the area in a 5-mile radius of NDFL is undeveloped ( Table 2 . 5) . The closest dwellings are in Bell Canyon, more than two miles away from any of the surface impoundments . There are a few acres of immature avocado orchards and one apiary , both on private land immediately adjacent to the SSFL facility . Data on prime or unique farmlands in the region are not available ; however , since the surface impoundments are being closed, the region will be unaffected . Dense residential development begins in the San Fernando Valley about 3-1/2 miles away . Homes are rapidly replacing the farms located there (Table 2 . 5) . Sweet corn and hay for nearby pleasure horses appear to be the primary crops . Other truck farms occur in the Simi Valley . 3 miles north , and in the Thousand Oaks Area , 9 miles southwest of the site .

1Relevant sections taken from the Environmental Impact Appraisal of Atomics International ( AI) Facilities , Canoga Park and Chatsworth , California by U .S . Nuclear Regulatory Commission , September, 1977 .

M 4 BNA0397020 7 HDMSe00181533 I-

(a;l!?r`.:1 BARRE N 0 SAGEBRUSH SEMIBARREN (Crosshatch over any lypel CHAPARRAL SHRUB

GRASSLAND WOODLAND TREE S

CULTIVATED MILES 0 1 2 3 4

0 1 2 3 4 5 6 KILOMETER S

Fig . 2 .4 . Vegetation map (1931 ) of area sur ro unding the SSFL site . Sourc : U.S . Department of Agriculture, U.S . Forestry Service . Vegetation Sypee of California, CaLabaeae Quadrangle, Sheet 1610 . Berkeley, Calif . . 1938 . Table 2 . 5 . Land use in 5-mile radius of SSF L

Percent of Tota l Land Use area ( 78 .5 sq miles )

Agriculture ( including livestock and crops) 0. 1

Commercial 0 . 4

Industrial

Residential 26 . 6

Unused raw land 72 . 9

Total 100 .00

Source : Rockwell International, Atomics International Division , Answers to "Questions Relative to Environmental Reports of Atomics International's Nuclear Fuel Facilities at Los Angeles , California," Canoga Park, California, December 1976, Question 11, Table 4 .

ECOLOGY

Terrestrial biota

San Fernando Valley - common biot a

The potential natural vegetation of the San Fernando Valley is believed to be California Oakwoods . 10 Such vegetation forms a dense to open woodland dominated by several oak species ( Quercus agrifolia , Q . chrysolepis, Q . douglasii , Q . englemanii, Q . lobata, Q . wislizenii ) along with digger pine (Pinus sabiniana ) . The potential vegetation is a matter of conjecture, however, for it has been almost entirely erased - first by irrigated agriculture , then by residential development . Today the west end of the San Fernando Valley contains an urban ornamental vegetation composed primarily of grass and Dichondra lawns, exotic shrubs , and shade and ornamental trees including Eucalyptus spp ., Olea europa, Cedrus deodora, Phoenix spp ., Washingtonia spp ., citrus spp ., and Pinus halapensis .

The fauna in the San Fernando Valley is probably similarly depauperate of nondisturbance species . Characteristic animals of coastal cismontane urban areas include the opossum ( Didelphus marsupialis virginiana), southern pocket gopher ( Thomomys bottae ), Norway rat (Rattus norvegicus), black rat (Rattus rattus ), house mouse (Hus musculus ), barn owl ( Tyto alba) ,

Mflu II BNA0397020 9 HDMSe00181535 mourning dove ( zenaidura macroura ), spotted dove (streptopeiia chinensis), domestic dove ( Columba livia ), mockingbird ( Nimes polyglottos ), Brewer's blackbird (Euphagus cyanocephalus ), house sparrow (Passer domesticus), house finch ( Carpodacus maxicanus ), and brown towhee (Pipilo fuscus) . In more rural , farmed areas , the opossum , striped skunk ( Mephitis mephitis), coyote (Canis latrans ), black-tailed jackrabbit ( Lepus californicus), California ground squirrel ( Citellus beecheyi), southern pocket gopher, deer mouse (Peromyscus maniculatus ), house mouse, sparrow hawk (Falco sparverius ), Western kingbird ( Tyrannus verticalis ), mourning dove, mockingbird , horned lark (Eremophila alpestris ), loggerhead shroke (Lanius ludovicianus ), western meadowlark ( sturnella neglecta ), brown towhee, and the gopher snake (Pituophis melanoleucus ) are also characteristic . The applicant made inquiries to several state and national agencies for further information , but little site-specific information is available to supplement these general species lists .

SSFL Common Biota

The potential natural vegetation of the Simi Hills is mapped as chaparral .11 This plant community forms a very dense vegetation of broad- leaved evergreen sclerophyll shrubs . It is dominated by either chamise (Adenostoma fasciculatum ) or manzanita (Aretostaphylos spp .) and California lilac ( Ceanothus spp .) ; numerous other shrub species are subdominant .

Data from the U . S . Department of Agriculture indicates that much of the Simi Hills crest was semibarren (<50% vegetation cover ), whereas the crest and the remaining upland areas were covered by chaparral which was dominated by (a) Adenostoma fasciculatum ( chamise chaparral ) or by ( b) Salvia apiane, S . leucophylla , and S . mellifera ( coastal sagebrush of ref . 11) . Open grasslands occurred primarily on the lower southeast slopes, and oak woodland (Quercus agrifolia ) appeared only in the canyons near ephemeral streams ( Bell Canyon , Las Virgenes Canyon) .

Inspections of the SSFL in the 1970s revealed that most of the Simi Hills area was dominated by an oak woodland ( Quercus agrifolia) with undergrowth of grass or sage (Salvia) species . Canyon vegetation was dominated by shrub willow (Salix spp .), California bay (Umbellularia californica ), and broom (Baccharis spp .) ; no oaks were evident . Apparently much of the chamise chaparral has been replaced by oak woodland since 1931 . The most likely explanation for this succession is that fire suppression activities allowed the fire-tolerant chaparral vegetation to be replaced by the less fire -tolerant oaks and sages .

Faunal descriptions of the Simi Hills area were rather limited . Animals of rural cismontane coastal areas listed above would likely be present at the Simi Hills site . In addition , animals characteristic of the coastal sage, chaparral , and oak woodland should be common at the SSFL site . These include the mule deer (Odocoileus hemionus ), gray fox (Urocyon cinereoargenteus), bobcat (Lynx rufus ), western gray squirrel ( Sciurus griscus ), brush rabbit (Sylvilagus bachmanni ), dusky-footed woodrat ( Neotoma fuscipes ), nimbl e

BNA0397021 0 HDMSe00181536 kangaroo rat (Dipodomys agilis ), desert wood rat (Neotoma lepiou), 3lifornia mouse (Peromyscus californicus ), California quail ( tophortyx ilifornicus ), mountain quail (Oreortyx pictus ), acorn woodpecke r ,Melanerpes formicicorus ), scrub jay (Aphelocoma coerulescens ), Costa's hummingbird ( Calypte costae ), cactus wren (Campylorhynchus brunneicapiilum), Lazuli bunting ( Passerina amoena), wrentit ( Chamaea fasciata ), plain titmouse ( Parus inornatus ), common bushtit (Psaltriparus minimus ), poor-will (Phalaenoptilus nuttailii ), Bewick ' s wren (Thryomanes bewickii ), black-headed grosbeak (Pheucticus melanocephalus ), California thrasher ( Toxostoma redivivum ), rufous-sided towhee (Pipilo erythrophthalmus ), orange -crowned warbler (Vermivora celata ), sage sparrow (Amphispiza beili), rufous-crowned sparrow (Aimophila ruficeps ), western fence lizard (seeloporus occidentalis), southern alligator lizard (Gerrhonotres multicarinatus ), coast horned lizard (Phrynosoma coronatum), skinks (Eumeces skiltonianus, E . gilberti), striped racer (Masticophis lateralis), western rattlesnake (Crotalis viridis), and red rattlesnake (C . ruber) .1 2

SSFL and San Fernando Valley - endangered species

There are 236 plant species in California classified as endangered .13 Examination of their geographic distributions14 indicates that nine of the species occur in Ventura County or adjacent Los Angeles County . These species are listed in Table 2 .8, along with information regarding their geographic distributions and habitat preferences . Four of the species are unlikely to occur in the western San Fernando Valley or in the Simi Hills (Hemizonia minthornii, Pentachaeta lyonii, Dudleya multicaulis , Astragalus tener var . Titi) because either their habitat preferences or their geographic distributions do not coincide with the sites . Of the remaining species, three are likely to be found in the Simi Hills (Dudleya cymosa, Dioentra ochroleuca , Eriogonum crocatum ), one would be limited to the valley (Chorizanthe leptoceras), and one could occur,at both localities (Berberis nevinii) . The latter two species are unlikely to occur in the western San Fernando Valley today because of the lack of nonurban habitat .

The 25 species of terrestrial California vertebrates classified as endangered are listed with the geographic ranges and/or habitat preferences of each1 5 in Table 2 .9 . Of those listed, only three species (southern bald eagle, prairie falcon, American peregrine falcon) are potential residents of the SSFL area . This conclusion is based on nonspecific range descriptions, rather than on information indicative of the presence of the birds at or near the site .

U BNA0397021 1 HDMSe00181537 Table 2 . 8 . Endangered plant speciesa of Ventura and Los Angeles counties, Californi a

Family, genus , species subspecies b Habitat and geography b

1 . Astereae -Hernizonia Chaparral zone ; Santa Susana Mountains mintborni i

2 . Astereae - Pentachaeta Valley grassland ; coastal Los Angeles Count y lyonii ( Chaetopappa lyonii) c

3 . Berberidacase - Coastal sage scrub and chaparral ; San Fernando (Berbaris nevinii ) Valley

4 . Crassulaceae - Chaparral ; Santa Monica Mountains , southern Dudleya cymosa Ventura County spp . marcescens

5 . Crassulaceae - Chaparral ; Los Angeles County Dudleya multicauli s

6 . Fabaceac - Astragalus Coastal strand ; coastal Los Angeles Count y tener var. Titi

7 . Fumaraceae - Dicentra Dry disturbed places below 3000 ft in chaparral ; ochroleuca ( Papaveraceae) c

8 . Polygonaceae - Coastal sage scrub and San Fernando Valle y Chorizanthe leptocera s

9 . Polygonaceae - Rocky slopes at about 500 ft, coastal sage scrub ; Eriogonum crocatum northern base of Santa Monica Mountains , Ventura County aFrom Smithsonian Institution, "Report on Endangered and Threatened Plant Species of the United States," Serial No . 94 A, U .S . Government Printing Office, Washington, D .C ., 1975 . bUnless otherwise noted, nomenclature and range of habitat from P . A . Munz, "A Flora of Southern California," University of California Press, Berkeley, California, 1974 . cFamily or genus classification from footnote a .

V BNA0397021 2 HDMSe00181538 Table 2 . 9 . Endangered Wildlife of Californi a

Common name Habitat and geography

Blunt-nosed lizard Cuyana River Valley, San Joaquin Valley San Francisco garter snake San Francisco are a Santa Cruz long-toed salamander Santa Cruz County, two localitie s Desert slender salamander Santa Rosa Mountains , Riverside County only Tehachapi slender salamander Kern County onl y Limestone salamande r Mariposa County Shasta salamander Lake Shasta Inyo County toad Inyo County, onl y California brown pelica n Anacapa Island, Ventura County , ( 40 miles SW of site ) Aleutian Canada goos e Occasional winter visitor to northern Californi a Tule-white - fronted goose Winters in central Californi a California condo r Tehachapi Mountains and north ( 40 miles N of site ) Southern bald eagle Nests in California Prairie falcon Nests in Baja California and possibly in southern Californi a American peregrine falcon Nests in California California clapper rail Central California coas t Light-footed clapper rail Santa Barbara County and south in salt marshes Yuma clapper rail Lower Colorado Rive r California least tern Coastal California , San Francisco south to Baja Californi a Spotted ow l Northern California , Southern California mountains ; forests onl y Santa Barbara song sparro w Not available ; assumed to be in Santa Barbara County Morro Bay kangaroo rat San Luis Obispo County, sandy soils on southern side of Morro Ba y Salt Marsh harvest mouse San francisco Bay region San Joaquin kit fox Western side of San Joaquin Valley, Kern County and nort h

Source : U .S . Department of the Interior, Fish and Wildlife Service, " Threatened Wildlife of the United States ," Resource Publication 114, U .S . Government Printing Office, Washington, D .C ., 1973 .

BNA0397021 3 HDMSe00181539 REFERENCES

for Description of the SSFL Environment

1 . G . Schumacher , The Deepest Valley : Guide to California ' s Owens Valley and Its Mountain Lakes, Roadsides and Trails , Wilderness Press, Berkeley, Californi a

2 . U .S . Department of Agriculture , U .S . Forestry Service, Vegetation Types of Califo rnia , Calabasas Quadrangle , Sheet 161D, Berkeley , Calif . 1938 .

3 . R . W . Peterson , Council on Environmental Quality , letter to Heads of Agencies , Aug .30 , 1976, "Analysis of impacts on prime and unique farmland in environmental impact statements . "

4 . U .S . Department of the Interior , National Park Service, The National Register of Historic Places, Superintendent of Documents , Washington, D .C ., 1972 ; supplement, 1974 .

5 . W . D . Thornbury, Regional Geomorphology of the United States, John Wiley & Sons, Inc ., New York, N .Y ., 1965, pp . 545-46 .

10 . Rockwell International , Atomics International Division , Answers to "Questions Relative to Environmental Reports of Atomics International's Nuclear Fuel Facilities at Los Angeles , California ," Canoga Park , Calif ., December 1976 .

11 . A . W . Kuchler, Potential Natural Vegetation of the Conterminous United states, American Geographical Society Special Publication 36, New York, N .Y ., 1964 .

12 . E . C . Jaeger and A . C . Smith, introduction to the Natural History of Southe rn Califo rnia , University of California Press , Berkeley , Calif ., 196 6

13 . Smithsonian Institution , Report on Endangered and Threatened Plant Species of the United States , Serial No . 94-A, U .S . Government Printing Office, Washington , D .C ., 1975 .

14 . P . A Munz, A Flora of Southern Califo rn ia , University of California Press , Berkeley , Calif ., 1974 .

15 . U .S . Department of the Interior, Fish and Wildlife Service, Threatened Wildlife of the United States , Resource Publication 114, U .S . Government Printing Office, Washington , D .C ., 1973 .

BNA0397021 4 HDMSe00181540

ROCKWELL/ROCKETDYNE r, SURFACE IMPOUNDMENTS

Ak u11 8

ENVIRONIMNM ZIt'FCEt>d&T 10N FQ31I (Tb Be Completed By Applicant)

Date Filed March 30, 1988

General Information owned/operated by 1. Name and address of developer or project sponsor: Rockwell International Corporation. 6633, Ca a CA 91303 Areas I, III, and IV at the 2. Address of project : Santa Susana Field Laboratory, top of Woolsey Canon, Simi Hills, Assessor ' s Block and Lot Number: Area I = 685-05 (05-16-17) CA Area III= 685-05 (09-11) ; Area IV= 685-05 (09-11-12 ) 3 . Name , address, and telephone number of person to be contacted concerning this project : Steven R . Lafflam, Manager,Rocketdyne Environmental (818) 700-5705 Rocketdyne, 6633 Canoga Avenue, Canoga Park, CA 9130 3 4 . Indicate number of the permit application for the project to vbich this form pertains: EPA# CAD 093365435 (Areas I&III) ; CAD000629972 (Area IV)

5. List and describe any other related permits and other public approval s required for this project, including those required by city, regional , state and federal agencies: No city permits . Approvals required by Region al Water Quality Control Board (L .A .) and EPA Region IX (contact = Michael Fernandez ) . Rocketdyne does have . an NPDES permit for the SSFL° site =CAOnn13n9- All of SSFL is in the Simi Hills of Ventura County, 6. Existing zoning district: and in the Santa Susana mountains . It is listed as RASA, Rural Agricultural 5 acres, conditional use permit #248 from Ventura County . 7 . Proposed use of site (Project for which this form is filed) : Discontinue use . The proiect is to close five Rockwell/Rocket yne-owne surface impoundments . . Project Description

8 . Site size . Please see attached table .

9. Square footage . Please see attached table .

10 . Number of floors of construction . Does not apply.

11 . Amount of off-street parking provided . Does not apply .

12 . Attach plans . Pleas e see attached information in schedule under nex t item .

13 . Proposed scheduling . Please see attached schedule .

14 . Associated project . Does not apply .

15 . Anticipated incremental development . Does not apply .

16 . If residential , include the number of units, schedule of unit sizes, range of sale prices or rents, and type of household size expected . Does not apply .

BNA0397021 6 HDMSe00181542 17. If dial, indicate the type. Tbether neighborhood , city or regionally oriented, . squaxe footage of sales area, and loading facilities. Does not apply . 18 . If industrial , indicate type , estimated ®ployment per shift , and loading facilities. Aerospace operations ; 800 people @ SSFL/shift; no loading facilities . 19.- If institutional , indicate the major function , estimated employment per ' shift, estimated occupancy, loading facilities , and ccmmunity benefits to be derived from the project . Does not apply.

20. If the project involves a variance , conditional use or rezoning applica- = tion , state this and indicate clearly why the application is required . Variance request has been submitted to the Department of Health Services . Are the following items applicable to the project or its effects ? Discuss below all items checked yes (attach additional sheets as necessary);

21 . Change in existing features of any bays, tidelands , beaches, or hills, or substantial alteration of ground contours .

22 . Change in scenic views or vistas from existing residential areas or public lands or roads.

23. Change in pattern, scale or character of general area of x project .

24 . Significant amounts of solid waste or litter . x x I 25. Change in dust , ash, smoke, ftma s or odors in vicinity . 26 . Change in ocean , bay, lake , stream or ground water quality or x quantity , or alteration of existing drainage patterns .

27. Substantial change in existing noise or vibration levels in x the vicinity.

28 . Site on filled land or on slope of 10 percent or more .

29 . Use of disposal of potentially hazardous materials , such as toxic substances , flammables or explosives .

30 . Substantial change in demaiid for municipal services (police, fire, rater, sewage , etc .) . x 31 . Substantially increase fossil fuel consumption (electricity, oil, natural gas, etc.).

32. Relationship to a larger project or series of p rojects . x The larger project to which this is related is the groundwater remediation Envirosmental Setting project for the entire SSFL site .

33 . Describe the project site as it exists before the project, including information on topography, soil stability . plants and animals , and any cultural, historical or scenic aspects . Describe any existing structures on the The Hydrogeological Assessment Report describes this section in full . It has been submitted to both the DOHS and the RWQCB . U A II BNA03970217 HDMSeOO181543 site , and the use of the structures. Attach photographs of the site . Snapshots or polaroid photos will be accepted .

34 . Describe the surrounding properties, including information on plants and _ animals and any cultural, historical or scenic aspects . Indicate the type of land use ( residential , commercial , etc.), intensity of land use (one- family, apartment houses, shops , department sto res, etc .), and scale of development ( height, frontage , set-back , rear yard , etc .) . Attach photographs of the vicinity . Snapshots or polaroid photos will be accepted . Please see attached information .

[3ertificatioc

I hereby certify that the statements furnished above and in the attached ex- hibits present the data and information required for this initial evaluation to the best of my ability , and that the facts, statements, and in formation presented are true and correct to the best of my knowledge and belief .

March 30, 1988 Date Signature S . R . afflam, Manage r

For ROCKWELL INTERNATIONAL CORPORATIO N ROCKETDYNE DIVISION (Note: This is only a suggested form . Public agencies are free to devise their own format for initial studies .)

II BNA0397021 8 HDMSe00181544 Items 8 and 9

ROCKWELL/ROCKTTDYNE SURFACE IRPOUNI77IFNlS AT SSF L

Surface Impoundment Name and Site Size Area in Capacity in P Location Sq. ft . Gallons

APTF-1 26' x 30' 780 40,600 Area I - based on 7' depth

APTF- 2 40' x 55' 2,200 131,600 Area I based on 8' depth

STL-IV- 1 83' x 112' 9,29 6 278,14 0 Area III i STL-IV- 2 50' x 118' 5,900 441,000 Area III based on 10' depth

ECL Oval shaped 1,200 44,000 i Area III Weedy pond

ROCKETDYNE-OWNED SURFACE IMFOUNIt4ENTS : TOTAL AREA IN SQUARE FEET = 19,376 sq . ft .

BNA0397021 9 HDMSe00181545 4 ENVIRONMENTAL INFORMAT 1RM --ITEI1S 12 & 13 ROCKWELL INTERNATIONAL/ ROCKETOYNE DIVISION ENVIRONMENTAL SURFACE IMPOUNDMENTS SSFL

FEB 1ST FY '8 8

WEEKS: 1 : 2 ' 3 :4: :5 6 :7: . 8 :9 :10 : `11 :12 :13 :14 15 i6 "17 :18'19 :20 :21 :22 :23 : :25 : 26 :27 :28 :29 : 30 :31: A R PREPARATION bang APpRovA L APTF/STL I V FINAL DESIGN • P2 BID AND AWARD P1 P2 CONSTRUCTION Pt 2

ECL FINAL DESIGN P t P 2 BID AND AWARD

CONSTRUCTION

• DEFOLIATIO N DELTA ABSP STL4-2 • DIVERSION SYSTEM ABSP/DELTA • LINER REMOVAL j . SPA 1 & 2 PLF • SOIL REMOVAL (IF REQUIRED)

• Advanced Capital Funds Approved July Mileston e ISSUE DATE : 2-22-88 REV DATE : 3-25-88 171 Design Revie w P1 - P2 Phase 1 & 2 0 Meeting DOHS/EPA ENVIRONMENTAL INFORMATION FORM ITEM 03 4

DESCRIPTION OF THE SSFL ENVIRONMENT 1

This section provides basic information concerning the physical , biological, and cultural environment of the Santa Susana Field Laboratory (SSFL ) facility . The surface impoundments are situated in the midst of the 2600-acre site which is located in the Simi Hills of southeastern Ventura County . It is about 29 miles northwest of downtown Los Angeles . The nearest communities are in the Simi Valley , about 3 miles north of the site, and east of the San Fernando Valley, via Woolsey Canyon Road to the flatlands below .

DEMOGRAPHY

Approximately thirty thousand people live within a five-mile radius of the SSFL facility, and the nearest resident lives within a mile .

LAND US E

The SSFL site is located at the west end of the San Fernando Valley . The Valley has been intensely farmed since the Los Angeles Aqueduct was completed from Big Pine in 1913 . The abundant irrigation water provided by the aqueduct was at first used primarily for citrus orchards and truck farms . According to a vegetation map drawn in 1931 of western Los Angeles County and southeastern t Ventura County ( Fig . 2 .4 ), the area at that time consisted of about 31% farm and urban land . It is apparent from the map that almost all this land exists in the San Fernando Valley .

Residential developments , particularly after World War II , have steadily replaced farmland in the Valley . Today the Valley's land use is primarily residential covering about 65% of the a rea ( Table 2 . 4) . Only a few truck farms remain (Table 2 .4) .

The SSFL is located in southeastern Ventura County near the crest of the Simi Hills at the western border of the San Fernando Valley . The Simi Hills have never supported intensive farming or development because the terrain is too rugged and rocky . Today, about 73% of the area in a 5 -mile radius of NDFL is undeveloped ( Table 2 . 5) . The closest dwellings are in Bell Canyon, more than two miles away from any of the surface impoundments . There are a few acres of immature avocado orchards and one apiary , both on private land immediately adjacent to the SSFL facility . Data on prime or unique farmlands in the region are not available ; however, since the surface impoundments are being closed , the region will be unaffected . Dense residential development begins in the San Fernando Valley about 3-1/2 miles away . Homes are rapidly replacing the farms located there ( Table 2 . 5) . Sweet corn and hay for nearby pleasure horses appear to be the primary crops . Other truck farms occur in the Simi Valley, 3 miles north , and in the Thousand Oaks Area , 9 miles southwest of the site .

'Relevant sections taken from the Environmental Impact Appraisal of Atomics International (Al) Facilities , Canoga Park and Chatsworth , California by U .S . Nuclear Regulatory Commission , September, 1977 .

V BNA0397022 1 HDMSe00181547 .-,aa:;_~.! BARRE N SAGEBRUS H SEMIBARREN (crosshatch over any Iypel CHAPARRAL SHRUB GRASSLAN D WOODLAND TREES CULTIVATED MILE S 0 2 3 4

O 2 3 4 S KILOMETER S

.4 . o193 Agriculture,V DepartmentZof 1re)tof are a 1610, Berkeley , (F Service , vagetationeXpeeFof bias : U Calif ., 1938 . Catifornia, Calabaoae .S . qr,adM"gle, Sheet Table 2 . 5 . Land use in 5-mile radius of SSF L

Percent of Tota l Land Use area ( 78 .5 sq miles )

Agriculture ( including livestock and crops) 0 . 1

Commercial 0. 4

Industrial <0 . 1

Residential 26 . 6

Unused raw land 72 . 9

Total 100 .00

Source : Rockwell International , Atomics International Division , Answers to "Questions Relative to Environmental Reports of Atomics International's Nuclear Fuel Facilities at Los Angeles , California ," Canoga Park , California, December 1976, Question 11, Table 4 .

ECOLOGY

Terrestrial biota

San Fernando Valley - common biot a

The potential natural vegetation of the San Fernando Valley is believed to be California Oakwoods . 10 Such vegetation forms a dense to open woodland dominated by several oak species ( Quercus agrifolia , Q . chrysolepis . Q . douglasii, Q . englemanii , Q . lobata , Q . wislizenii ) along with digger pine (Pinus sabiniana ) . The potential vegetation is a matter of conjecture, however, for it has been almost entirely erased - first by irrigated agriculture , then by residential development . Today the west end of the San Fernando Valley contains an urban ornamental vegetation composed primarily of grass and Dichondra lawns , exotic shrubs, and shade and ornamental trees including Eucalyptus spp ., olea europa, Cedrus deodora, Phoenix spp ., Washingtonia spp ., Citrus spp ., and Pinus halapensis .

The fauna in the San Fernando Valley is probably similarly depauperate of nondisturbance species . Characteristic animals of coastal cismontane urban areas include the opossum ( Didelphus marsupialis virginiana ), southern pocket gopher ( Thomomys bottae ), Norway rat ( Rattus norvegicus ), black rat (Rattus rattus), house mouse ( Mus musculus ), barn owl (Tyto alba) ,

BNA0397022 3 HDMSe00181549 ourning dove ( Zenaidura macroura ), spotted dove ( Streptopelia chinensis), T. omestic dove (Columba livia), mockingbird ( Nimus polyglottos) . Brewer' s blackbird ( Euphagus cyanocephalus), house sparrow ( Passer domesticus), house finch (Carpodacus maxicanus), and brown towhee (Pipilo fuscus) . In more rural, farmed areas, the opossum, striped skunk (Mephitis mephitis), coyote (Canis latrans), black-tailed jackrabbit (Lepus californicus), California ground squirrel (Citellus beecheyi), southern pocket gopher, deer mouse (Peromyscus maniculatus), house mouse, sparrow hawk (Falco sparverius), Western kingbird (Tyrannus verticalis), mourning dove, mockingbird, horned lark (Eramophila alpestris), loggerhead shroke (Lanius ludovicianus), western meadowlark (Sturnella neglects), brown towhee, and the gopher snake (Pituophis melanoleucus) are also characteristic . The applicant made inquiries to several state and national agencies for further information, but little site-specific information is available to supplement these general species lists .

SSFL Common Biot a

The potential natural vegetation of the Simi Hills is mapped as chaparral .11 This plant community forms a very dense vegetation of broad-leaved evergreen sclerophyll shrubs . It is dominated by either chamise (Adenostoma fasciculatum ) or manzanita ( Arctostaphylos spp .) and California lilac (Ceanothus spp .) ; numerous other shrub species are subdominant .

Data from the U . S . Department of Agriculture indicates that much of the Simi Hills crest was semibarren (<50% vegetation cover), whereas the crest and the remaining upland areas were covered by chaparral which was dominated by (a) Adenostoma fasciculatum (chamise chaparral) or by (b) Salvia apiana, S . leucophylla, and S . mellifera (coastal sagebrush of ref . 11) . Open grasslands occurred primarily on the lower southeast slopes, and oak woodland (Quercus agrifolia) appeared only in the canyons near ephemeral stream s (Bell Canyon, Las Virgenes Canyon) .

Inspections of the SSFL in the 1970s revealed that most of the Simi Hills area was dominated by an oak woodland (Quercus agrifolia) with undergrowth of grass or sage (salvia) species . Canyon vegetation was dominated by shrub willow (Salix spp .), California bay (Umbellularia californica), and broom (Baccharis spp .) ; no oaks were evident . Apparently much of the chamise chaparral has been replaced by oak woodland since 1931 . The most likely explanation for this succession is that fire suppression activities allowed the fire-tolerant chaparral vegetation to be replaced by the less fire-tolerant oaks and sages .

Faunal descriptions of the Simi Hills area were rather limited . Animals of rural cismontane coastal areas listed above would likely be present at the Simi Hills site . In addition, animals characteristic of the coastal sage, chaparral, and oak woodland should be common at the SSFL site . These include the mule deer (Odocoileus hemionus), gray fox (Urocyon cinereoargenteus), bobcat (Lynx rufus), western gray squirrel (Sciurus griscus), brush rabbit (Sylvilagus bachmanni), dusky-footed woodrat (Neotoma fuscipes), nimbl e

BNA03970224 HDMSe00181550 4. . 'oo rat ( Dipodomys agilis ), desert wood rat (Neotoma lepida), lifornia mouse ( Peromyscus californicus ), California quail ( Lophortyx .iifornicus ) . mountain quail (Oreortyx pictus ), acorn woodpecker (Melanerpes formicicorus ), scrub jay (Aphelocoma coerulescens ), Costa's hummingbird (Calypte costae), cactus wren (Campylorhynchus brunneicapillum), Lazuli bunting (Passerine amoena ), wrentit (Ch ea fasciata ), plain titmouse ( Parus inornatus ), common bushtit ( Psaltriparus minimus), poor-will (Phalaenoptilus nuttallii), Bewick's wren (Thryomanes bewickii), black-headed grosbeak (Pheucticus melanocephalus), California thrasher (Toxostoma redivivum), rufous-sided towhee (Pipilo erythrophthalmus), orange-crowned warbler (Vermivora celata), sage sparrow (Amphispiza belli), rufous-crowned sparrow (Aimophila ruficeps), western fence lizard (sceloporus occidentalis), southern alligator lizard (Gerrhonotres multicarinatus), coast horned lizard (Phrynosoma coronatum), skinks (Eumeces skiltonianus, E . gilberti), striped racer (Masticophis lateralis), western rattlesnake (Crotalis viridis), and red rattlesnake (C . ruber) .1 2

SSFL and San Fernando Valley - endangered specie s

There are 236 plant species in California classified as endangered .13 Examination of their geographic distributions14 indicates that nine of the species occur in Ventura County or adjacent Los Angeles County . These species are listed in Table 2 .8, along with information regarding their geographic distributions and habitat preferences . Four of the species are unlikely to occur in the western San Fernando Valley or in the Simi Hills ( Hemizonia minthornii, Pentachaeta lyonii, Dudleya multicaulis, Astragalus tener var . Titi) because either their habitat preferences or their geographic distributions do not coincide with the sites . Of the remaining species, three are likely to be found in the Simi Hills ( Dudleya cymosa , Dioentra ochroleuca, Eriogonum crocatum), one would be limited to the valley (Chorizanthe leptoceras), and one could occur at both localities (Berberis nevinii) . The latter two species are unlikely to occur in the western San Fernando Valley today because of the lack of nonurban habitat .

BNA0397022 5 HDMSe00181551 Table 2 . 8 . Endangered plant speciesa of Ventura and Los Angeles counties , Californi a

Family, genus , species subspecies b Habitat and geography b

1 . Astereae - Hernizonia Chaparral zone ; Santa Susana Mountain s minthorni i

2 . Astereae - Pentachaeta Valley grassland ; coastal Los Angeles Count y lyonii (Chaetopappa lyonii) c

3 . Berberidacase - Coastal sage scrub and chaparral ; San Fernando (Berbaris nevinii ) Valley

4 . Crassulaceae - Chaparral ; .Santa Monica Mountains , southern Dudleya cymosa Ventura Count y spp . marcescens

5 . Crassulaceae - Chaparral ; Los Angeles County Dudleya multicauli s

6 . Fabaceae - Astragalus Coastal strand ; coastal Los Angeles Count y tener var . Titi

7 . Fumaraceae - Dicentra Dry disturbed places below 3000 ft in chaparral ; ochroleuca ( Papaveraceae) c

8 . Polygonaceae - Coastal sage scrub and San Fernando Valley Chorizanthe leptocera s

9 . Polygonaceae - Rocky slopes at about 500 ft, coastal sage scrub ; Eriogonum crocatum northern base of Santa Monica Mountains , Ventura County aFrom Smithsonian Institution , " Report on Endangered and Threatened Plant Species of the United States ," Serial No . 94 A, U . S . Government Printing Office, Washington , D .C ., 1975 . bUnless otherwise noted, nomenclature and range of habitat from P . A . Munz, "A Flora of Southern California," University of California Press, Berkeley, California, 1974 . cFamily or genus classification from footnote a .

II BNA0397022 6 HDMSe00181552 Table 2 . 9 . Endangered Wildlife of Californi a

Common name Habitat and geograph y

Blunt-nosed lizard Cuyana River Valley, San Joaquin Valley San Francisco garter snake San Francisco area Santa Cruz long-toed salamander Santa Cruz County, two localitie s Desert slender salamander Santa Rosa Mountains , Riverside County only Tehachapi slender salamander Kern County onl y Limestone salamande r Mariposa County Shasta salamander Lake Shasta Inyo County toad Inyo County, onl y California brown pelica n Anacapa Island , Ventura County , ( 40 miles SW of site ) Aleutian Canada goos e Occasional winter visitor to northern Californi a Tule-white- fronted goose Winters in central Californi a California condo r Tehachapi Mountains and north (40 miles N of site ) Southern bald eagle Nests in Californi a Prairie falco n Nests in Baja California and possibly in southern Californi a American peregrine falcon Nests in California California clapper rail Central California coas t Light-footed clapper rail Santa Barbara County and south in salt marshes Yuma clapper rail Lower Colorado Rive r California least ter n Coastal California , San Francisco south to Baja Californi a Spotted ow l Northern California, Southern California mountains ; forests onl y Santa Barbara song sparrow Not available ; assumed to be in Santa Barbara County Morro Bay kangaroo rat San Luis Obispo County, sandy soils on southern side of Morro Bay Salt Marsh harvest mouse San francisco Bay region San Joaquin kit fox Western side of San Joaquin Valley, Kern County and nort h

Source : U .S . Department of the Interior, Fish and Wildlife Service, "Threatened Wildlife of the United States," Resource Publication 114, U .S . Government Printing Office, Washington, D .C ., 1973 .

UI II BNA0397022 7 HDMSe00181553 REFERENCES

for Description of the SSFL Environmen t

1 . G . Schumacher, The Deepest Valley : Guide to Califo rnia ' s Owens Valley and Its Mountain Lakes , Roadsides and Trails , Wilderness Press, Berkeley, Californi a

2 . U .S . Department of Agriculture , U .S . Forestry Service, Vegetation Types of California , Calabasas Quadrangle , Sheet 161D, Berkeley , Calif . 1938 .

3 . R . W . Peterson , Council on Environmental Quality , letter to Heads of Agencies , Aug .30 , 1976, "Analysis of impacts on prime and unique farmland in environmental impact statements . "

4 . U .S . Department of the Interior , National Park Service , The National Register of Historic Places , Superintendent of Documents, Washington, D .C ., 1972 ; supplement, 1974 .

5 . W. D . Thornbury . Regional Geomorphology of the United States , John Wiley & Sons , Inc ., New York , N .Y ., 1965, pp . 545-46 .

10 . Rockwell International , Atomics International Division, Answers to "Questions Relative to Environmental Reports of Atomics International's Nuclear Fuel Facilities at Los Angeles , California ," Canoga Park, Calif ., December 1976 .

11 . A . W . Kuchler , Potential Natural Vegetation of the Conterminous United states, American Geographical Society Special Publication 36, New York, N .Y ., 1964 .

12 . E . C . Jaeger and A . C . Smith, introduction to the Natural History of Southern California , University of California Press , Berkeley, Calif ., 1966

13 . Smithsonian Institution, Report on Endangered and Threatened Plant Species of the United States, Serial No . 94-A, U .S . Government Printing Office, Washington, D .C ., 1975 .

14 . P . A Munz , A Flora of Southern Califo rnia , University of California Press, Berkeley , Calif ., 1974 .

15 . U .S . Department of the Interior , Fish and Wildlife Service , Threatened Wildlife of the United States , Resource Publication 114, U . S . Government Printing Office , Washington , D .C ., 1973 .

V BNA0397022 8 HDMSeOO181554 I

TABLE I

GROUNDWATER CJALITY SUMMARY TABLE ENGINEERING CHEMISTRY LABORATOR Y ECL IMPOUNDMEN T S(WLE ORGANIC COMPOUND CONCENTRATION IDENTItIER DATE SAMPLED (Detected at rnncentration greater than Ion ugfl* )

RS-12 06 /05/87 Trichloroethylene 1100 SH-1 06 /06/87 1,1-Dichloroethylene 42 0 1,1,1-Trichloroethane 13 0 Trichloroethylene 260 SH-2 06/06/87 Carbon Tetrachloride 270 Trans-1,2-Dichloroethylene 12 0 Trichloroethylene 11 0 SH-3 06/06/87 Carbon Tetrachloride Chloroform 83 0 420 1,1-Dichloroethane 20 0 1,2-Dichloroethane 210 1,1-Dichloroethylene 390 1,1,1-Trichloroethane 580 Trichloroethylene 35 0 SH-4 06/06/87 Carbon Tetrachloride 23,000 Chloroform 31,00 0 1,2-Dichloroethane 59,000 1,1-Dichloroethane 10 0 1,1-Dichloroethylene 70 0 Methylene Chloride 70 .000 Tetrachloroethylone 400 1,1,1-Trichloroethane 2,40 Trichloroethylene 0 00 N-- 1 1 600 Toluene 800 J0 Z -% o pM ug/1 = Mi w crograms per liter . ~ W 0Ln0 2 l 10 N U) N m c0 0 0 i

TABLE I

GROUNDWATER QUALITY SUMMARY TABLE ENGINEERING CHEMISTRY LABORATOR Y ECL IMPOUNDMENT

SAMPLE ORGANIC COMPOUND CONCENTRATION IDENTIFIER ATE SAMPLED (Detected at concentration greater the 100 ua/1' ) (ma/11 )

RS-12 06 /05/87 Trichloroethylene 1100

SH-1 06/06 / 87 1,1-Dichloroethylene 420 1,1,1-Trichloroethane 130 Trichloroethylene 260

SH-2 06/06/87 Carbon Tetrachloride 270 Trans-1 ,2-Dichloroethylene 12 0 Trichloroethylene 110

SH-3 06/06/87 Carbon Tetrachloride 830 Chloroform 420 1,1-Dichloroethane 200 1,2-Dichloroethane 210 1,1-Dichloroethylene 390 1,1,1-Trichloroethane 580 Trichloroethylene 35 0

SH-4 06/06/87 Carbon Tetrachloride 23,000 Chloroform 31,000 1,2-Dichloroethane 59,000 1,1-Dichloroethane 100 1,1-Dichloroethylene 700 Methylene Chloride 70,000 Tetrachloroethylene 400 1,1,1-Trichloroethane 2,400 Trichloroethylene 1,600 Toluene 800

ug/1 = Micrograms per liter . I

TABLE I ( continued )

GROUNDWATER QUALITY SUMMARY TA13L E ENGINEERING CHEMISTRY LABORATOR Y ECL IMPOUNDMENT

SAMPLE ORGANIC COMPOUND IDENTIFIER DATE SAMPLED CONCENTRATION - ( Detected at concentrat ion greater than 100 ug/l*) (ug/1_ ) SH-5 06/ 06/87 Chloroform 290 1,2-Dichloroethane Trans- 160 1,2-Dichloroethylene 100 Trichloroethylene 100 SH-8 06/06/87 Carbon Tetrachloride Chloroform 300 270 Trans-l,2-Dichloroethylene 15 0 Trichloroethylene 110 SH-9 06/06/87 Carbon Tetrachlorid e 41 0 Chloroform 54 0 1,1-Dichloroethane 170 1,2-Dichloroethane 530 1,1-Dichloroethylene 18 Trans- 0 1,2-Dichloroethylen e 410 Trichloroethylene 15 0 SH-10 06/06/87 Chlorofor m 190 1,2-Dichloroethane Trans- 170 l,2-Dichloroethylene 130 ES-14 04/28/87 Trichloroethylene 1,500 ES-24 04/28/87 1,1-Dichloroethane 52 0 1,1-Dichloroethy lene 1,500 Trans-1 .2-Dichloroethylene 3 90 z Trichloroethylen e Z 17,000 O ES-3 0 04/28/87 Trichloroethylene 22 0 ug/l = Micrograms per liter . 2 l C) O 0) Ca) m 0 0 oD Ui 4Ui 88RC03581 April 4, 1988

TABLE I I PROXIMITY OF WELLS TO IMPOUNDMENT EC L WITHIN 1000 FOOT RADIUS WELL IDENTIFIER APPROXIMATE DISTANCE (FEET) HAR 26 85 RS-11 1000 RS-12 950 WWS-8 1000 WS-11 900 RD-8 25 RD-11 80 RD-12 145 SH-1 100 SH-2 2 5 SH-3 1 5 SH-4 5 SH-5 70 SH-6 (DRY) 220 SH-7 150 SH-8 40 SH-9 50 SH-10 120 SH-11 23 0 ES-14 95 0 ES-24 1000 ES-25 900 ES-30 1000

BNA0397023 2 HDMSe00181558 88HC03581 April 4, 1988

RocKetdyne ' s SSFL Surface Impoundments Photographs from March 15, 1988 Split Sampling ( DOHS & Rocketdyne) Identifier Tabl e

Photo Identification No . (lower right hand corner) Remark s

60Z 11-3/15/888-S-10* Alfa Bravo Skim Pond ( ABSP) GRC hydrologists Hawkins & Fouschee ; Rocketdyne Environmental ' s Matsushita

6DZ11-3/15/88-S1N* Same as above, other end of ABS P

6DZ11 -3/15/88-S1G* ABSP, panoramic view 6RC's Hawkins & Fouschee samplin g

6DZ11 -3/15/88-SiC * Delta DOHS Staff Members Romero & Sonkprasha with Rocketdyne Environmental ' s Fujikawa ; Matsushita with Hawkins & Fousche e

6DZ11 -3/15/88-SlE* Delta Proposed sampling places ; only two were used because of soil saturated with groundwate r

6DZ11-3/15/88-S1M* Ice chest ( GRC's) with ice and soil sample containers at Delta

6DZ11-3/15/88-S1K* GRC' s Fouchee showing sample boring, slide hammer for boring, and stake with yellow marker ; Hawkins making log at Delt a

Note : The original volume of the Alfa Bravo Skim Pond ( ABSP) was 295,000 ; Delta ' s capacity was 572 , 200 gallons .

BNA0397023 3 HDMSe00181559