RADIANC O M P L I C A T I O N

EXH IB I T A

SCOPE OF WORK

This exhibit descr ibes the tasks which will be complet-ed dur ing the Remed i a l Inves t igat ion and Feas ib i l i ty Study at theIndustr ia l Trans former s Super fund Si te .

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The tasks and the assoc ia ted work scope have beenprepared to sat i s fy the fol lowing ob j e c t i v e s :

• Determine the nature and extent of PCB contaminationin surface soil , sed iment , and subsurface soil ,

• De t e rm i n e the nature and exten t of TCE contaminat ionof soils and ground wa t e r ,

• De t e rm i n e the nature and exten t of env i ronmenta lcon tam ina t i on from any other hazardous subs tance , "and

• Determine the range of effect ive remedial alterna-t ives for deal ing with any contaminat ion character-ized by the inves t igat ion .

Rad i an will furnish the personne l , mater ia ls , andserv i ces necessary to perform the Remed ia l Invest igat ion andFeas ib i l i ty Study descr ibed here in , excep t as otherwise noted .

TASK D E S C R I P T I O N

The tasks wi th in this scope of work fall into two broadcategor ie s , Remedial Investigation and Feasibi l ity Study. TheRemed ia l Invest igat ion phase includes the Prepara tory Act iv i t i e s( 1 0 0 task ser ies) and the Site Invest igat ion (200 task ser i e s ) ,The 300 'task ser i e s cons t i t u t e s the Feas ib i l i ty Study.

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RI/FS a c t i v i t i e s wil l be run con cu r r en t l y to the e x t e n tprac t i ca l .

Spec if i c tasks wi th in each of these broad categor i e sare de s c r i bed be low.

1 .0 P R E P A R A T O R Y ACTIVIT IES

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Pr ior to in i t iat ing any field work , Rad i an will com-plete the following t a s k s .

Task 1 0 1 ; Ob t a i n a n d Rev i ew Ex i s t i n g Data

Dat a , r e cord s , and pub l i ca t ions aval iable at thefo l lowing agenc ie s will be r ev i ewed .

• TWC• EPA• USGS• Ci ty of" Hous ton• TDH• HL & P and Entex• Texas Rai lroad

Comm i s s i o n

• Harr i s County• H ighway Depar tmen t• Subs i dence Di s t r i c t• Soi l Con s e rva t i o n Serv i ce• Weathe r Bureau• Un ive r s i t y of Texas Bureau of

Economic Geology• Tax i n g Authorit ies

In add i t ion to rev iewing the files at the above agen-c i e s , Rad i a n wil l r e v i ew ava i l ab l e test imony from invo lvedper son s , aer ia l pho tog raph s , and other ava i l able pert inenti n f o rma t i o n .

RADIANC O R F O M A T I O M

The da t a w i l l be r ev i ewed and ana l y z ed to d eve l op ani n format ion base on ' t h e fo l l ow ing s ub j e c t ma t t e r s .

• Topography, soil character i s t i c , and geology,• Land use at and in the v i c i n i t y of the" s i te ,• E a s em e n t s , r ight-of way s , and underground ut i l i t i e s ,• Surface dra inage , surface water hydrology, and

surface wate rqua l i t y ,• Hydrogeo logy at and in the vic in i ty of the s ite,• Reg i ona l Cl imat i c Cond i t i o n s ,• Vege tau i ona i/eco l og i c a l f ea ture s at the s i te ,• Cultura l features at and around the s i te ,• Surface and subsurface soil con tam ina t i on ,• Groun d wate r use and deve lopment in the vic in ity of

the s i te ,• Ground wate r qual i ty ( bo t h on-s i te and of f- s i t e ) ,• Chrono l o g i c a l h i s tory of the site inc luding waste

h a n d l i n g p r a c t i c e s ,• Chro no l o g i c a l h i s tory of the re spon s e a c t i o n s " a t the

s i t e ,• Wat e r well records wi th in one mile of the site

inc lud ing but not l imited to well locat ion, wellcons truct ion spec i f i cat ions , water quality,dr i l l er ' s log, wel l owner , y ie ld , and use , and

• Legal property boundar ies and landowner names ,a d d r e s s e s , and te lephone number s .

The end product from this data r ev i ew will be aninformal letter repor t wh i ch will also inc lude a base map showings i te lay out , d r a i n ag e pa t t e r n s , e a s emen t s , and nearby wel l s .

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Ex i s t i n g e n v i r o nm e n t a l qua l i t y da ta from the site willbe presented in summary form and eva lua ted .with respect to itsimpact on the current study .

The second aspect of this task will be to in it iatel i terature search on PCB and TCE document i ng known env i ronmenta lchemistry , potent ia l env i ronmenta l and health effects , and likelyremedia l technolog ies for PCB and TCE. Al so , the s i te specif icdata collected in this task will be evaluated and analyzed toidentify potential pathways and receptors .

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Task 1 0 2 : .P r e p a r e a S i t e Managemen t Plan

In this task , Rad ian wil l deve lop specific mobi l i zat ionplans and procedures to initiate field act iv it ies . This willinclude provis ions for:

• Office space needs in the field,• On- s i t e s torage of equ ipment (may include rent ing of

a warehouse space n ea rby ) ,• Plans and procedures for field act iv i t ies and their

coord ina t i on with ex i s t ing commerc ia l operat ions ,• Plans and procedures for conduct ing field activities

in view of the condit ions at the site i . e . , debrisand other d i s carded mater ia l at the site,

• On- s i t e de con tam ina t i on a r ea ,• Needs to handle emergenc i e s - both on-s ite and

off-s i te ,• Requ i rement s for power, wate r , sanitat ion, and

telephone,• Si te secur i ty and sa f e ty , and• Temporary storage of drill cutt ings and groundwater

produced dur ing remed ia l i nve s t i ga t i on and theiru l t ima t e d i sposa l .

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Task 1 0 1 : Pr e p a r e Pro j e c t P l a n s

In o r d e r to comp l e t e f ie ld s tud i e s in a cos t e f f e c t i v eand technica l ly app r op r i a t e manne r as wel l as prov ide a fulldocumen ta t i o n of cond i t i o n s and procedure s for ob ta i n i ng samp l e s ,Rad i a n will prepare the fo l lowing pro j e c t p lann ing document s .

• Samp l i n g P l a n ,• Hea l t h and Safe ty P l an ,• QA/QC P l a n , and• Pro j e c t Managemen t P lan .

The con t en t s of the above plans are br i ef ly descr ibed be low.

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The Samp l i ng Plan will be a conc i s e statement descr ib-ing all field ac t i v i t i e s in suff i c i ent deta i l to guide fieldpersonne l in all a spe c t s of the field i nve s t i ga t i on . It willinc lude the fol lowing:

• Number of samp l e s , sample locat ions , and type s , .f ield tes t ing procedures and equ ipment , samplep r e s e r va t i o n , and sh ipment and laboratory require-men t s ,

• Methods for dri l l ing and instal l ing wells andspec i f i cat ions for field per formance ,

• Methods for obta in ing soil and ground water samples ,• Methods for obta in i ng run-off and sed iment samples ,• Documentat ion of sample acquis it ion act ivit ies:samp l i ng t rack ing from field to laboratory ,• Procedure s to eva luate fie ld results and operat ions

and modify them accord ing ly ,• De s c r i p t i o n of the mann e r in which Rad ian will

manag e , s to r e , and d i spose of waste mater ia l s ,inc lud ing but not l imited dril l cut t i ngs , produced

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ground wa t e r , and d e c e n t am i n a t i odu r i n g the s i t e i n v e s t i g a t i o n ,c o n s i d e r e d the genera tor of was tthe site inves t igat ion . Rad ianwa s t e s . p r o d u c e d dur ing the on-s isuch a manne r as to preven t thec on t am i n an t s to the surface wateair . Rad ian shall dispose of aloff-s i te in a manner appropr ia teand approved by the TWC, , and

n wa t e r , g e n e r a t e dThe TWC shal l bees produced du r i n gshall store thete act iv i t i e s inre lease of ther, ground wat e r , orl wastes generatedto its compos i t ion

• Personne l , equipment, and supplies requirements.

The Heal th and Safety Plan will be a concise ly wri t tenstatement of procedures to be used to protect the health andsafety of pe r sonne l : engaged in RI/FS ac t iv i t i e s . It willident ify an on-s i t e health and safety off icer and include hisresponsibi l it ies and authorit ies. The plan will describe overallproject safety organ i za t ion and admin i s trat ion . The plan willident ify required protec t ion levels for each type of fieldac t iv i ty , on-s i te health and safety mon i tor i ng requ i rements , safework ing levels for chosen ind icator pararae ter (s ) , and proceduresto be adopted in case of emergenc i e s . The Health and Safety Planwill be prepared in • ac cordance with EPA gu idance document(Occupat i ona l He • 1 t h and Safe ty Manua l , EPA , Wash i n g t o n , D . C . ) .Included in the Health and Safety Plan will be procedures toprotect the health and safety of per sonne l , tra in ing require-ments , use and ma i n t e nan c e of safety equ ipment , and mechan ics forreporting problems. The health and safety plan will comply withappropr ia te regu lat ions o f CERCLA [Sec t i on I I I ( c ) ( 6 0 ) ] , OSHA ,a n d N IOSH .

The Q A / Q C Plan will be a conc i se ly wr i t t en s tatement ofprocedures to be used for samp l i ng , ana lys i s , data handl ing, andsample cu s tody . I t wil l ident i fy a pro jec t QA/QC manage r andwill inc lude m i n imum Q A / Q C requ i r emen t s for field sampl ingact iv i t i e s , analyt ical work, and data reduct ion.

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RADIANC O R P O R A T I O N

This plan will also i n c l ude n e c e s s a r y s i gn-of f procedures forf ie ld samp l i ng ac t iv i t i e s and cha in of cu s tody procedures forsamples . The plan will be prepared in accordance with EPAgu idance document s on RI/FS s tud ie s and TWC gu idance on QA(Gu i d a n c e i n Remed ia l Inves t igat ions unde r C E R C L A , U S E P A ; Guid-ance i n Feas ib i l i t y study under C E R C L A , U S E P A , and Qua l i tyAssurance Pro j e c t Plan for TWC for Env i ronmen ta l Mon i tor ing andMeasurement Act iv i t i e s Relat ing to the R C R A ) .

A project management plan will be prepared to track thecost and performance s of the pro j e c t . This will con ta i n :s chedu l e s , cos t , manpower , and equipment requ i rement s , andspec if ic output for each task . It wil l a l so include proposedmeet ing and other ma j o r m i l e s tone s .

It is noted that no field act iv i t i e s will be in i t iateduntil written approval of all of the above plans has been received

Task 1 0 4 : Mob i l i z e f o r Field Ac t i v i t y

Upon rece ipt of approva l of al l pro ject plans (Task1 0 3 ) , Radian will mobi l ize to initiate field work. Mobilizationwill be accompl i shed as per the Site Management Plan (Task 1 0 2 ) .

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Prior to mobi l i zat ion , a site vis i t will be conducted .The purpose of this s i te visit will be to spec ify prel iminarysampl ing locat ions , , ver ify the access ib i l i ty of sampl ing loca-t ions , locate underground uti l it ies, rev i ew site access anddecontaminat ion pad locat ion, conf irm exist ing well locations,rev iew site dra i nage , coord inate with on-s i t e bus inesses ,f i na l i z ed de s c r i p t i on of ex i s t ing land use s , and obta in officespace and s torage a r e a s .

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Upon comp l e t i o n of this s i te v i s i t , Rad ian willin i t iate effor t s to have an off i c e , s tart cons t ruc t i on of anon-s i te d e con t am i na t i o n a r e a , fence area as n e c e s s a ry , obta innecessary uti l i t ies, order drums and other equipment and mater i-als. Al so , if deemed neces sary and feas ib le , a magnetometersurvey will be conduc ted to locate bur i ed drums , e tc . It ise s t imated that mob i l i za t i on act iv i t i e s may take up to three weeksto complete .

2 . 0 SITE INVEST IGATION

This phase of the project deals with acqu ir ing samplesfrom the fie ld, obta in i ng analytical resu l ts , and performing datareduc t ion to charac ter i z e and quant ify the nature and ex t en t ofcontaminat ion in all env i ronmenta l med ia and the potent ia l forcon tam inan t m i g ra t i o n . Also inc luded in this phase will befurther conf i rmat ion of p'oten tial receptors and env i ronmenta lcharacter i s t i c s of the s i t e . Da t a will be suff ic ient to allowthe deve lopment and preparat ion of the Feasibi l i ty Study .

Table 1 ident i f i e s the max imum number of samples foreach sample type that Rad i a n may, at the direct ion of the TWC, berequ ired to col lect , and ana l y z e . In add i t i on to the max imumnumbe r , the text of this scope of work spec i f i e s the min imumnumber of samples for each sample type that Rad ian will collectand ana l yz e . The goal of ident ify ing the min imum and maximumnumber of samples for each sample type is to provide flexibi l i tyto mod ify and/or further ref ine the work plan within prescr ibedl imits in the Samp l i n g P l a n or dur ing field act iv i t i e s . In theevent that the TWC d irect s Rad i a n to col lect less than themax imum number of samp le s , Rad i a n will upon further ins truct ion

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Tab l e 1

SAMPLE S U M M A R Y

TaskNumber

201

202

203

205

207

208

209

SampleType

Water

Soil

Soi l

Soil

Soil

Wa t e r

Water

Air

Number ofSamp le s

1 0

38

66

69

22

18

7

8

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OpParame t e r s

VPOP -2, TCE-8

PCB -30 , TCE-5POP -2~, D i ox i n - 1

PCB-40 , TCE-20POP -5 , D iox i n - 1

PCB -55 , T C E - 1 0POP -2, D i o x i n -2

PCB-22

T C E - 1 4 , VPOP * * -4

PCB-5 , POP* -2

PCB-8

* - Pr io r i t y organ ic pol lutants

* * - Volat i l e pr ior i ty organ ic po l lu tants

RADIANC O M ^ O H J i T I O M

from the TWC per fo rm other mutua l ly ag r e e ab l e s e r v i c e s at a tota lcost not to e x c e e d . the budge t ed cos t s a l l o c a t e d to those sample snot co l lected.

Rad i a n wi l l co l lect , s to r e , t r an s po r t , and ana lyze a l lsamples in accordance wi th the approved Samp l i ng and QA/QC p lan s .

This phase of the project will inc lude the fol lowing

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ta sk s :

Task 2 0 1 : Ex i s t i n g Water Well Inventory and Sampl ing

Task 101 will prov ide a documen ta t i o n of avai lable fileinformat ion on wells wi th in one mile of the s ite . In this task area sonab l e effort will be made to contact each tenant/occupant ofeach property wi th in a half mile rad iu s of the s ite. This willinc lude a well informat ion form which will be deve loped andmailed to owner s . The form wil l requ ire informat ion on use ofwell , withdrawal ra te s , depth of wel l s , well construct ion det-ai ls , date of well insta l lat ion , name of dril ler, well log, andwater qual ity. To further complete this i nven tory , a house-to-house survey will be conducted with in a half mile radius for thepurposes of ver ify ing the file informat ion as well as for loca-ting wells not recorded in file. Ver i f i ca t ion will be conductedto the extent it is safe and access is avai lable to these houses .If feas ible, the occupant s will be in terv iewed to fill anymiss ing informat ion in the file. Part i cu lar at tent ion will begiven to the on-s i te wel l , the well at Equip Co n , and the well atthe Southwes tern Bell fac i l i ty .

To the ex t e n t it is feas ib le and appropr i a t e , waterlevel measuremen t s wi l l be made in all wells and 4 wells will besampled twice on separa te oc ca s i on s . Eight samples will beana lyzed for TCE and two for pr ior i ty vo la t i l e o rgan i c s .

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RADIANC O H P O M A T I O M

It is noted tha t this task wi l l be in i t ia ted uponcomplet ion of Task 101 and the TWC approva l of the Ex i s t i n g Wat e rWell Inventory Pro c e d u r e s .

Task 2 0 2 : Su r f a c e Soil and Sed im e n t Ana lys i s CQ*O°*The purpose of this program will be to ver ify the past ®'Odata and to obta in add i t iona l data to further exam ine the contain- Q

inat ion in surface 'soi ls and s ed imen t s . The d i s t r ibut ion cons id-era t i on s for se lect ing the number and locat ion of surface soiland s ed imen t s samples a r e :

• Site history,• Prev i o - u s samp l i ng ,• Dra i nag e d i t ches ,• Downg r a d i e n t locat ions , and• Upgr a di en t/"back ground .

The actua l number and locat ion of soil samples will bespec if ied in the Samp l i n g P lan .

The samples will be col lected using sta in less steeltrowe l s and p laced in j a r s wi th teflon l id l iners and screenedwith HNu . Trowels wil l be c leaned with ace tone and water betweensamp le s . The sample j a r s will be placed in coolers and sh ippedovern igh t to Rad i a n for ana lys i s . A total of 20 to 30 soilsamp le s will be col lected and ana lyzed for P C B . Based upon HNus c r e e n i n g , 3 to 5 samp l e s will be ana lyzed for TCE and 1 to 2samples w i l l . b e ana lyzed for organ i c pr ior i ty po l lutants . Al so ,the sample showing h ighes t PCB conc en t ra t i on will be analyzed ford i o x i n .

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Task 2 0 3 : ' Sha l l ow Bor i ng . P r o g r am

Bas ed upon t h e resu l t s o f Task s 101 and 2 0 2 , 15 to 20locat ions wil l be i d en t i f i ed for shal low bor ings (depths of 4f e e t ) . Compos i t e soi l samples at depths of 0-2 feet and 2-4 willbe obta ined us ing a ^She lby Tube . This sampl ing scheme yie lds amin imum of 30 and a max imum of 40 soil samples for laboratoryeva l ua t i on . The locat ion for the bor ings will be based uponrev iew of ex i s t i ng data and wil l be g iven in the Sampl ing P lan .Throughout the dr i l l ing, a geologist will be present and will berespons ib le for keep ing a bor ing log. All samples as they areex t r ud ed will be screened us ing an HNu . The analyt ical programwill be as fo l lows: ,

• 30 to 40 samples will be ana lyzed for PCB ,• 10 to 20 samples hav ing h ighest HNu read ings will be

ana lyzed for TCE , and• 3 to 5 samples showing h ighest HNu read ings will be

ana lyzed for pr ior ity organ i c s , and• The sample hav i ng h ighest PCB concentrat ion will be

ana lyzed for d iox in .

All dril l cutt ings will be placed in plastic bags andmarked with bor ing number . Plast ic bags will subsequently beplaced in drums. Mater ia l s will be appropr iate ly d isposed in anoff-s i te landfi l l . All bor ings will be immediate ly grouted withcement/benton i t e m ix tu r e .

Task 204 :_Deeper Soil Bor i ng Prog r am

Rad ian shall complete bor ings at a min imum of 3 and amax imum of 5 locat ions to max imum depths not to exceed 50 feet .Bor i ng s will be performed us ing a cont inuous fl ight hollow stemaug e r . An e ight inch PVC surface ca s i ng wil l be supp l i ed for the

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RADIANC O E T P O H A T I O M

f irst ten feet of the bo r i n g . Samp l i n g wil l be accomp l i s hed wi tha She lby t ub e , sp l i t s poon , or other app rop r i a t e sample s advan c e dwith in the hol low s t em auge r . A dri l l s i t e geo log i s t wil l berequ i red to select approp r i a t e sample s , mon i t o r HNu sampl ing , andlog the bo r i n g s . Samples will be co l l ected to the depth of thebor ing a s de s c r i bed below a t the fo l lowing i n t erva l s : 0, 2 . 5 r ,5 f , 7 . 5 ' , 1 0 ' , 1 5 ' , 2 0 T , 2 5 ' , 3 0 ' , 4 0 ' , a n d 5 0 ' . A boring m a y b et e rm ina t ed at a depth of less that 50 feet prov i d ed :

1„ The bor ing ha s penetrated t h e uppermos t water-bear ing zone (shal low aqu i fer ) and at several feetinto the f irst under ly ing clay un i t , and

2. The bor ing has pene tra ted to a suff ic ient depth thatthe last 2 samples co l lected conta in no detectab levolat i le organ ics us ing the HNu .

Rad ian shall col lect a min imum of 33 and a max imum of55 soil samples . All soi l samples col lected shall be ana lyzedfor PCS . Rad i a n shal *L ana lyze a m in imum of 3 and a max imum of10 soil samples for TCE . One to two samples will be analyzed forpr ior i ty organ ics . One to two samples will be analyzed ford iox i n . TCE and pr ior i ty organ i c s samples will be selected fromthose 'hav ing the h ighest HNu read ings and the d iox in samples willbe those hav ing the h ighest PCB values .

Cutt i ng s and dri l l ing fluid from each boring will beplaced in drums . The drums will be marked with boring numbersand depths . Upon rece ip t of analyt ical resu l ts , cutt ings will beappropr iate ly d isposed in an approved off-s ite landfill.

All bor i ng s not conver ted to shallow mon i tor ing wells,will be immediate ly grouted with cement /ben ton i t e mixture fromthe bottom up to the top . At least two samples from each strata(for a total of up to 10) will be sub jec t to geotechnica l tes t ingwhich inc ludes permeab i l i t y , gra in s ize ana lys i s , Atterburgl imit, and plast ic i ty i n d ex .

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RADIANC O f » » O M J t T I O M

Rad i a n wi l l at the d i r ec t i on of the TWC , conver t 2deeper bor ings to sha l low mon i t o r i n g we l l s .

Task 2 0 5 : Mon i tor Wel l Instal lat ion

Us i n g up to 350 feet of dr i l l ing , Rad ian will insta l l4-6 wells in the upper water bear ing zone and one well in thelower water bear i ng zone . Initial locat ions of wells will begiven in the Sampl ing Plan . One of the shallow wells will benear the on-s i te well . Based upon data col lected in Task 204(pr imar i l y depth of water bear i ng z o n e ) , number of wells and welll ocat ions will be ad ju s t ed to sat isfy the resource avai l abil ityand the requ i r ement to limit the screen intervals to 10 feetonly.

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Shallow wells will be dri l led us ing hollow stem auger .The deep well will have an 8 inch outer cas ing installed using acont inuous fl ight auger . Once the 8 inch cas ing is instal led,the deep well will be drilled us ing a hollow stem auger or otherappropr ia te methods as de te rm ined in the field in consu l tat ionwi t h ' t h e TWC.

Shal low wells will be completed f irst . They will beconstructed of 2 inch stain less steel . Based upon HNu screen ing ,a deeper well will be re located near one of the shallow wel ls .The deep well will b"e a 4 inch s ta in l e s s steel well . The wellsconstructed will have appropriate sartd pack, bentonite seals andben ton i t e/cemen t groat to the surface . Tht construct ion detailswill be fully i l lustrated in the Samp l i ng P l a n . All wells willbe deve loped us ing compres sed air . Stee l barr i er posts (asr e qu i r e d ) , locking caps , and concre te pads wil l be cons truc ted ateach well.

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All cu t t i ng s and dr i l l i ng fluid wi l l be placed in drumsand labeled. Cut t i ng s wil l be ana lyzed for PCS for properd i sposa l . It is e s t ima t e d that there wil l be 22 samples r equ i r edto properly complete the disposal a c t i v i t y .

Task 206 : Te s t i ng of Wells

Upon complet ion and deve lopment of wel ls , Slug testswill be conducted on each of the wells to determine the aquifercharacter i s t i c s . A known quant i ty of water will be pumped intothe well and measurements of the change in water level will bemade . The data will be analyzed to prov ide the permeabil ity ofthe aqu i fer . The procedures and equat ions to be used for dataanalys i s will be spec i f i ed in the Sampl ing P lan . If appropr iateand if the budget a l lows , a pump test will be performed on thedeep well.

Task 2 0 7 : Ground Water Sampl ing and Ana ly s i s

All newly installed wells will be sampled twice with a2 morfth interval be tween sampl ing excurs ions . In all instances,water levels will al'so be mea su r ed . In the f irst round, allwel ls will be sampled for TCE only . In the subsequent round, the4 wells showing high'est TCE will also be sampled for organicpriority volatile pol lutants . 7 to 14 samples will be analyzedfor TCE and 2 to 4 wil l be ana lyzed for volat i le organ i c pr ior i typol lutants .

Task 2 0 8 : Storm Water Samp l i ng

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Attemp t s wi l l be made to ob ta i n samples from a run-offeven t dur ing f ie ld ac t i v i t i e s . Up to 5 samp le s may be obta inedand ana lyzed for PCB ! . A l s o , 2 of the 5 sample s (1 on-s i te and 1background) will be 'analyzed for organic prior ity pol lutants.

RADIANC O V B " O I I J t T I O M

Task 2 Q Q : A i r Samp l i n g

Hi-Vol samples wil l be co l l e c t ed upw ind and downwind ofthe s i te . Amb i en t air samples will be col lected dur i ng two j^,e ight-hour per iods subsequent to the s tar t of any field act iv i- ^t ies and dur ing two, e ight-hour per iods dur i ng any field act iv i t i e s . CD

C?"aSamples will be ana lyzed for total part iculates and t v v

PCB . Site will also be mon i tored for wind us ing an accumulator Ttype mon i tor .

Task 2 1 0 : Site Survey

A reg i s tered land surveyor will survey the site todetermine property boundary , install a permanent bench mark , andprovide e levat ions for wells and bor ings . In add i t ion , eleva-t ions may be mea su r ed at 3 add i t iona l po i n t s . Together , thesee levat ion points will be suffic ient to construct a topographicmap of the s ite.

Task 2 1 1 : Rec ep to r Iden t i f i ca t i on

In this task , Radian will ident ify potential receptor s .This will be based upon determinat ion of:

• Re s i d e n t and trans ient popu lat ion within 3 miles ofthe site,

• Cur r e n t and future use of surface and ground wa t e r s ,• Curren t and future land use in and around the site,

and• Bio log i ca l r e cep tor s in the immedi ate a r ea .

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RADIANC O M P O t t A Y I O M

Task 2 1 2 : D a t a Ana l y s i s

All da t a co l l e c t ed du r i ng the s ite i nve s t i ga t i on incon junct ion with previous ly collected data will be reduced todeterm ine the na ture and the ex t e n t of con tam i na t i o n and poten-tial r e c ep tor s . Spec i f i ca l ly the data will be analyzed toprov ide :

• A min imum of two geo log ic cross sect ions ,• Area of surfac ia l contaminat ion ,• Maps showing contaminated subsurface at d i fferent

con c en t ra t i o n leve l s ,• Ground wa t e r levels,• Charac t e r i s t i c s of aqu ifer ,• Potent ia l for movement of contaminants through a ir ,

surface water , and groundwater pathways. Simpleanalyt ica l models may be used to asse s s potent ialmovemen t s , and

• An Assessment of environmental input which may beexpec ted from the site on a short term and long termbas i s .

Task 2H: Prepare R/I Report

The R/I report will include all data utilized in thissite inves t i ga t ion , i . e . , pre-ex i s t i ng data plus data col lecteddur ing s ite inves t igat ion , al l analys is completed, and proceduresused for der iv ing per t i nen t conc lu s ions .

The following is a proposed outl ine of the R/I report .

Execu t i ve Summary1 . 0 In t roduc t ion1 . 1 S i t e Backg round1 .2 Nature and Ex t e n t o f Prob l em

oboo

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RADIANC O K P O W A T I O M

1 . 3 Remedia l I n v e s t i g a t i o n Summary1 .4 Ov e r v i e w o f Repo r t2.0 S i t e Feature s Inves t igat ion2.1 Demography CS2.2 Land Use *O2.3 Natural Resour c e s .P *2.4 Cl imato logy " °

O3.0 Hydrogeologic Inves t igat ion3 . 1 Soil - - - - '3 .2 Geology3 . 3 Groundwa t e r3.4 Summary of soil, subsurface and ground watercontaminat ion4.0 Surface - Wat e r and Sed imen t Invest igat ion4 . 1 Surface Water4 .2 Sed iment s4.3 Flood Potent ia l4 . 4 Dra i nage4.5 Summary o f surface wate r and sed imentcontaminat ion5 .0 A i r Invest igat ion6.0 Publ ic Health and Env i ronmen ta l Concerns6. 1 Potent ia l Receptors6.2 Publ ic Health Impacts6.3 Env ironmenta l ImpactsReferencesAppend i c e s

Initial ly, 5 copies of the draf t report will be submit-t ed . Upon rece ip t and sat i s factory Incorporat ion of TWC and EPAcomment s , Rad i an will issue 20 copies of the R/I report .

Dur i ng s ite i nve s t i ga t i on , a month ly report will besubm i t t ed by the 5th of each month . This wil l include a narra-t ive de s c r i p t i on of ac t i v i t i e s plus a tabu lar descr ipt ion of thepercen t of work comp le ted and the percen tage of funds expendedfor each ta s k .

RADIAKC O M P O N M T I O M

Task 2 1 4 : D i s p o s a l o f Dri l l Cut t i n g s , Dri l l i ng . . Fluidsand Gro u n dwa t e r Produc ed and other Mater i a l s

Based upon the analytical results of soil and groundwater , these mater ia l s will be appropr iate ly disposed. Rad ianwill prepare nece s sary papers , e . g . , man i fe s t s for TWC andcoord inate the disposa l of al l mater ia l s , i . e . , soi l , water ,d isposable clothing, e t c . , at an approved faci l i ty. In casedioxin are observed, the material will have to be stored on-site.

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Task 2 1 6 : As s i s t a n c e i n Commun i t y Re la t i on s

Radian will assist TWC in re spond i ng to public inqui-ries, in conduct of public meet ings, and in legal testimony. TWCwill have the lead for this task.

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RADIANC O M » 0 « * T I O M

3 . 0 FEASIBILITY STUDY

The work to be performed for the Feasibi l i ty Study isdescr ibed here in . The Feasib i l i ty Study will be prepared ina c co rdan c e wi th the EPA Guidance on Feasibi l i ty Stud ies , Apr i l ,1 9 3 5 . The Feas ib i l i t y Study cons i s t s of the fol lowing tasks andsub ta sk s .

Task 301 - Descr i p t i on of Cur r e n t S i tuat ionTask 302 - Pre l im inary Remed ia l Techno log iesTask 303 . - Deve lopment of Al te rna t ive s

Subta sk 3 0 3 - 1 - Es tab l i s hmen t o f Remed i a lTechnologies

Subtask 3 0 3 . 2 - Identif icat ion of RemedialA l t e r n a t i v e s

Initial Screen ing of Alternat ivesEvaluat ion of Alternat ives

- Draf t ReportFina l Report

Task 3 0 1 : Descr ipt ion of Current Situat ion

In this task , Rad ian will summar ize the current situa-t ion as deve loped in Remed ia l Inves t igat ion . It will summarizethe nature , ex t e n t , and level of con tam ina t i on in surface andsubsurface soi l s , s ed imen t s , surface wate r , and groundwater .Al so summar i z ed here wil l be remedial ob j e c t i v e and correspong ingnumer i ca l c r i t e r i a . The cr i ter ia will be appl ied to definec on t am i nan t r em o v a l , a n d t r ea tment and/or mi t igat ion needs at thesource or in the pathway .

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RADIANC O K P O K A T I O M

Task ^ 0 2 : Pre l im i na ry Remed i a l Te c h np l . p g j e g

Based on the s i te-spec if ic problems and statement ofpurpose ident i f i ed in Task 3 0 1 , Rad i a n will identify a list ofpotential ly feas ib le and innovat ive technolog ies . These techno-logies will addre s s both on-s i te and off-s i te remed i e s . Thislist will be s c reened based on site cond i t i o n s , waste charac ter-i s t i cs , and techn ica l requ irements to e l iminate or modify thosetechnologies that may prove extreme ly diff icult to implement,that would require unreasonab le time per iods and/or would rely oninsuff ic ient ly deve loped technolog ies . The list of screenedtechnologies will be presented to the TWC prior to proceeding toTask 3 0 3 . 2 .

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Task 30V: Deve l opmen t of Al t e rna t i v e

Rad i a n wil l deve lop a limited number of a l ternat ivesfor source contro l or off-s ite remedia l ac t i on s , or both, on thebasis of ob j e c t i ve s estab l i shed for the re sponse , which in turnwill be based on the resu l ts of the remedia l invest igat ion andcons iderat ion of prel iminary remedial technologies (Task 302) .

Subtask 3 0 3 . 1 : Establ ishment of Remedial ResponseObjec t i ve s

The FS ob jec t ive s will be set through d iscuss ions withTWC pr ior to the deve lopment of a l ternat ives from the list ofs c reened techno log i e s . Levels of clean-up will be establ ishedfor a ir em i s s i on s , d irect con tac t , con tam ina t ed soil, groundwater , sed iments , and surface water and final ized with TWC.

Rad ian will identify the potent ia l object ives of theremed ia l ac t i on program for each ma jor con t am i nan t pathway basedon ex i s t i n g and p ro j e c t e d l and , ground wa t e r , and surface waterusage , the ex t en t and magn i t ude of con t am i na t i o n and populat ionat r i s k . These s ite spec i f i c o b j e c t i v e s wil l be based on

21

RADIAN

c o n t am i n an t act ion levels deve loped from appl i cab le EPA and TWCs t a nda rd s and gu i dan c e for the c o n t am i n a n t s of c o n c e r n .

Ob j e c t i v e s for source contro l mea su r e s will be deve-loped to prevent or s i gn i f i can t ly m i n im i z e migrat ion of con t am i -na t i on from the s ite . Ob j e c t i v e s for managemen t of m ig ra t i onmeasure s will preven t o r m i n i m i z e impacts of con tam ina t i on thatmay have migrated from the s i te . Rad i an will develop the poten-tial remed ia l re sponse ob j e c t i ve s in consu l ta t ion with the TWC.

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Subta sk 3 0 3 - 2 : Ident i f i cat ion o f Remedia l Al ternat ive s

Rad i a n will deve lop s ite specif ic remed ia l a l ternat iveswhich will meet the response ob j ec t ive s and any other require-ments the TWC may feel are appropr i a t e for each migrat ion pathwayby comb in i ng those remed i al techno log ies ident if ied and screenedi n Task 302 above into operable un i t s .

A l t e r na t i v e s wil l be deve loped which include thefol lowing;

o Al t e r na t i v e s for off-site treatment of disposal , asappropr i a t e ,

o Al t e rna t i v e s which atta in appl icab le and/or relevantFederal publ ic health or env i ronmenta l s tandards ,

o Al t e rna t i v e s which exceed appl icable and/or re levantpubl ic health or env i ronmenta l s tandards ,

o Alternat ive s which do not at ta in applicable and/orre levant publ ic health or env i ronment ! standards butwill reduce the l ikel ihood of present or futurethreat from the hazardous substances , including ana l t ernat ive which closely approaches the level ofprotect ion prov ided by the appl icable or re levants tandards , and

o No act ion .

RADIANC O N ^ O M A T I O M

Al t e r n a t i v e s outs ide of these ca t egor i e s may a l so bedeve loped , such as non-c leanup a l t e r na t i v e s ( e . g . , a l t e rna t i v ewater supply, re loca t ion ) . Rad ian will develop the alternat ivesin close consu l tat ion w i th the TWC. Rad i a n will document the ^irat iona le for exc l ud i ng any techno log ies ident if ied in Task 302 *&̂*in the deve lopment of a l t e rna t i v e s . Rad i a n will submit a list of O

Oident if ied a l t ernat ive s to the TWC before proceeding to Task 3 0 4 . ^

Task 3 0 1 : Initial Scr e en i ng of Al t e rna t i ve 1

The initial listing of alternatives will be evaluatedwith respect to their impact on publ ic health and the env i ron-ment . Alternatv i e s which may have s ignif icant adverse impact ordo not adequate ly protect the publ ic health or the env ironmentmay prove extreme ly diff icult to imp lement or will not ach ievethe remedial object ives within a reasonable time, will be.modif i ed or e l im inated .

Upon complet ion of the s c r e en i ng of a l ternat ives forpubl ic health and env i ronment l impacts , those remain ing alterna-tives will be evaluated with respect to their implementation andtheir operat ion and : ma in t enance (O&M) cos t s . Costs will becomputed us ing read i ly ava i lab le da ta such as the "Remedia lAct ion Cost Compend ium" (EL I , 1 9 8 4 ) , Handbook : Remedia l Act ion a tWast e Disposa l S i t e s , ( E P A , 1 9 8 2 ) , a n d s tandard cost ind ices .The costs will be calculated to an accuracy of -50 to + 100per c en t .

Once the init ial costs are ca lcu lated , a pre sen t worthana lys i s based on a th irty year opera t i ng life will be performed .Rad ian will then compare present worth costs of the alternat ives .Those a l t e rna t i v e s cos t i ng an "order of magn i t ude " more and whichoffer s imi lar or small env i ronmen ta l or publ ic health benef i t s ,

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RADIANC O R P O R A T I O N

but no better re l iab i l i ty that compe t i ng a l t e r n a t i v e s will beel iminated. Alterna t i ves that are more exp e n s i v e but offersubstantial ly greater env ironmenta l and/or publ ic health benefitswill not be e l im i na t ed . For any a l t e rna t i ve determined unaccept-able , a ju s t i f i ca t i on for d i s card i ng wil l be ma i n ta i n ed andreferred to in the feas ib i l i ty s tudy . A summary of the d i s cardedal ternat ives will be inc luded in the feas ib i l i ty study.

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Task 305 : Evaluation of the Alternat ives

I n accordance with Sect ion 3 0 0 . 6 8 ( i ) of the N C P , Radianwill perform a deta i l ed analys is of a l ternat ives including atleast one a l ternat ive which addre s s e s :

• Off-site treatment or disposal ,• Alternat ives which attain applicable and/or relevant

Federa l public health or environmenta l s t andard s .• Al te rna t ive s which exceed appl icab le and/or re levant

publ ic health or env i ronmenta l s tandards , as appro-pr iate ,• Alternat ives which do not attain applicable and/or

re l evant publ ic health or env i ronmenta l s tandardsbut will reduce the likelihood of present or futurethreat from the hazardous substances . This mustinclude an alternat ive which most closely approachesthe level of protect ion provided by the applicableor re levant s tandards , and

• No act ion .

Radian will perform a detailed analysis on a maximum ofseven a l t ernat ive s . Each a l ternat ive will be evaluated todetermine its e f f e c t i v e n e s s , rel iabi l i ty, implement abil ity ,safety , and cos t . The technical ana lys i s will include:

• A descr ipt ion of appropriate treatment, storage andd i sposa l t e chno log i e s ;

I1IRADIANC O M ^ O R A T I O M

A d i s cu s s i on of how the a l t e rna t ive does or does nocomply with specif ic requ irements of other environ-menta l programs . When an a l t e r n a t i v e does notcomply , a d i scuss ion of how the a l ternat ive prevent sor min imizes the migrat ion of wastes and publichealth or env i ronmenta l impacts and a descr ipt ion ofspec ia l des ign needs will be inc luded, where appro-priate to achieve compl iance;

• An out l ine of operat ion ,requirements;

ma i n t enan c e , and mon i tor ing

• The ident i f i cat ion and eva luat ion of off-sitefacilities with respect to compliance with applica-ble RCRA and other EPA environmenta l programrequ i rements , both current and proposed . Potent ia ld isposal facil ities will be eva luated to determinewhether off-site management of site wastes couldresult in a potent ia l for a future re lease fr,pm thedisposal facil ity;

• An ident i f i cat ion of temporary storage requ i r ement s ,off-s ite d isposa l needs and transportat ion p lans ;

• A descr ip t i on of whether the a l ternat ive if imple-mented : will result in a permanent t rea tment ordestruct ion of the was te s , and , if not, the poten-tial for future re leases into the env ironment ;

• An out l ine of safety requ i rement s for implementat ionof the, a l ternat ive ;A descr ipt ion of how the alternative could be phasedinto ind iv idua l operable un i t s . This descr ipt ionwill include a d i scuss ion of how various operableunits could be implemented individually or in groupswhich would result in a s ign if i cant cost savings orimprovement to the env i r onmen t ;

• A descr ip t ion of how the a l ternat ive could besegmented into areas to allow implementat ion indiffering phases ; and

• A des c r i p t i on of spec ia l eng ineer i ng requirements ofthe a l ternat ive or site preparat ion requ irements .

Foi lowing the Technical Analys is of the alternat ives,Rad ian will perform an Environmental Asses sment (EA) of eacha l ternat ive . The EA will assess the benefic ial and adverse

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RADIANC O H P O K A Y I O M

effects of each a l t e rna t i v e and de s c r i be the measure s ne c e s sa ryto mit igate any adverse effects . The "No-Act i o n Alternat ive"will serve as a base l ine for this ana lys i s .

Rad ian will perform a Pub l i c Hea l th analys i s in accor-dance with the Superfund Publ ic Health Eva luat ion Manual datedDecember 18, 1 9 8 5 . This analysis will assess the extent to whicheach a l ternat ive mi t igates long-term exposure to any res idualcontamint ion and protect s the public health both during and afterits implementat ion. The assessment will descr ibe the levels andcharacterist ics of contaminants on-s:Lte, potential exposureroutes , and potent ia l ly affected populat ions . Aga in , the "No-Act ionAlternat ive" will be descr ibed in terras of both short terra, andlong term effects on public health and will serve as a basel inefor evaluation of the levels of exposure to contaminants and therelat ive reduct ion in contaminants over t ime . For Management ofMigra t i on Measu r e s , Rad ian will determine the relat ive reduct ionin impact by compar ing res idual levels of each alternat ive withexist ing criteria, standards , or guidelines acceptable to EPA.In this evaluat ion, , Rad i an will use establ i shed Cr i t e r i a/Standard s ,background and/or site specif ic health based risk levels asdef ined in the Superfund Publ ic Health Eva luat ion Manual .

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Radian will perform an "inst itut ional analysis" of eacha l ternat ive to determine the regulatory requ irements , permits ,agency coord inat ion , and community re lat ions requirements of eachalternat ive.

Final ly, a ref ined cost analys is of each a l ternat ivewill be performed . The costs will be computed , within a -30 to+50 percent accuracy , as present worth cost inc luding implementa-tion and annual O&M costs . Both monetary and non-moneta ry costswill be inc luded . A d i s t r i bu t i on of costs over time will beinc luded in this ana ly s i s .

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RADIAN

Rad i an will prepare a summary of the a l t e r n a t i v e s for use ins e l e c t i ng or r e commend i n g an a l t e rna t i ve to EPA . The summarywill be pre s en t ed in tabu lar format with the fo l lowing d a t a "pre s en t ed :

• Pre s en t Worth of Cap i ta l Cos t s - The net presentvalue of capital and O&M costs will be presented .

• Health Informat ion - For the No-Act i on Al t e rna t i v e ,EPA prefers a quant i tat ives s ta tement , including anestimated range of maximum individual risks. Wherequant if i cat ion is not poss ib le , a qual itat iveanalysis will be performed. For source controloptions, a quantitative risk assessment is notrequ ired . For management of migration measures , aquant i tat ive risk asses sment , including an est imatedrange of maximum individual risks, will bepresented .

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• Environmentalrisks will be

Effects - Onlysummar ized .

the most important

• Techn ica l Aspec t s of the Remedia l Al t e rna t i ve s - Thetechnical advantages and disadvantages will belisted, 'based on profess ional eng ineer ing judgmentand famil iarity with the site and the remedialtechnologies compris ing the alternative.

• Regulatory Compl iance - The ex t en t to which eachalternative meets all current and proposed regulatorycr i ter ia and standards as appl icable to the site.

• Community Effects - the extent to which each alter-nat ive impacts on daily community life such astraff ic , re locat ion, temporary health risks, andperceived public react ion,

• Off-Si te Disposa l - Whether the remedy involvesoff-site disposal and will document compl iance withEPA Criter ia for selecting an approved disposalfacil ity for the disposal of mater ia l s from a CERCLAs i te .

Task 106 : Draft Report

Radian will prepare a draft Feas ib i l i ty Study Reportfor rev i ew. This report will be prepared in accordance with theF5 gu idance document r e commended report format as fol lows:

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RADIANC O H P O H f l T l O M

Execut ive Summary1 . 0 Introduct ion

1 . 1 Si te Background Informat ion1 .2 Nature and Ex t e n t of Prob l ems1 -3 Ob j e c t i v e s o f Remed ia l Act i on

2.0 Screen i ng of Remed ia l Technolog ies2. 1 Technical Cr i t e r i a2.2 Remedial Act ion Alternat ives Developed2 * 3 . Env i ronmenta l a n d Pub l i c Health Cr i ter ia2.4 Other Screening Criter ia2.5 Cost Cr i t e r i a

3-0 Remedia l Act ion Alternat ives3.1 Alternat ive 1 (no-act ion)3.2 Al terna t ive 23 . 3 . . .3.4 Alternat ive N

4.0 Ana ly s i s o f Remed ia l Act i on Alternat ives4 . 1 Non-cost Cr i t e r i a Analys i s

4 . 1 . 1 Technical Feas ib i l i ty4 . 1 . 2 Env i ronmenta l Eva luat ion4 . 1 . 3 Institutional Requ irements4 . 1 . 1 Publ i c Health Eva lua t ion

4 . 2 Cost Analysis5.0 Summary of Alternat ivesReference sAppend i c e s

Radian will provide five copies of the draft report to the TWC.

Task 3 0 7 : Final Report

Rad ian will prepare a final feasibi l i ty study reportincorporat ing all TWC rev iew comment s . Rad i a n will bind in thefinal report a copy of the re spons ivene s s summary on publiccomments prepared by the TWC. Rad ian will submit twenty (20)copies of the final feas ib i l i ty study report to the TWC.

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EXHIBIT B

SCHEDULE OF DEL IVERABLES

1 . Project Plans (Task 1 0 3 ) 3 weeks from receipt of as igned con t rac t .

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2. Draft R/I Report (Task 2 1 3 ) 4.5 months from receipt o fapproved project plans .

3- Final R/I Report (Task 2 1 3 )

Remed ia t ion Ob j e c t i v e s -Informal Report (Task 303 )

2 weeks after receipt-ofcomments from TWC and E P A .

3 months from receipt ofapproved project p lans .

5. Draft Feasibi l i ty Repor t(Task 306)

6. Fi'nal F/S Report (Task 3 0 7 )

7 months from receipt ofnot i ce to proceed with F/S,

2 weeks from receipt ofcomment s from TWC and EPA ,

7. Monthly Reports On or before the 5th of eachmonth unti l submiss ion offinal F/S Repor t .

Assuming 2 week rev i ew per iods and in i t iat ion of F/S no laterthan 8 weeks from rece ipt of a s igned , R/I draft will be ava i l-able at 6.0 months from signing of the contrac t and F/S draftwill be avai lable at 9-0 months from s igning of the contract .