2 t C 8 0 CCO

O

I . O R I G I N A L C O M M E N T S , MARCH 1986

General Consents

Comment Ho.12345

Location ofChanges or A d d i t i o n sNAN ANANA

NAN ANA

E x p l a n a t i o nA d e q u a t e l y addres s ed.A d e q u a t e l y addres sed.A d e q u a t e l y a d d r e s s e d ,A d e q u a t e l y addre s s ed .The A p r i l 1986 RI Report included method detec t ionl i m i t s for GC/MS organic compounds in waters a m p l e s in T a b l e s 6-9 and 6-12 as requested fcyE P A . Detect ion l i m i t s f o r so l id matrix sampleswere not inc luded in the tab l e s as expla ined onpage 3-11, f i r s t paragraph and page 4-5, paragraph3. T h i s approach was di scussed with and agreed toby EPA prior to the A p r i l submit tal .A d e q u a t e l y addre s s ed .A d e q u a t e l y a d d r e s s e d .T h i s comment is addre s s edresponses to s p e c i f i c comments. through s p e c i f i c

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S p e c i f i c Cosraents

Convent Location ofChanges or Addi t i on s12 Pages 3-20 and 3-22

34567 Section 1.5.3,page 1-10

Explana t i onAdequately addressed.In response to s p e c i f i c comments 2 and 21 andexp lanatory cona&ent 3 r the French Limited TaskGroup believes that the statements requested by EPAto be added on pages 3-20 and 3-22 are conclusionsof law, not statements of f a c t . As such, theinclusion of such statements in the RI Report isnot appropriate . S i m i l a r l y , statements in theprevious d r a f t RI Report making legal conclusionspertaining to CERCLA and RCRA have been altered orde l e t ed to present only statements of f a c t . Inresponse to original s p e c i f i c comments 2 and 21,the French Limited T a s k Group believes that thereis a pauci ty of documented evidence concerning thewastes di sposed of at the site. Accordingly, thereis currently no basis to conclude that thematerials in the lagoon are RCRA-Subpart D wastes.Adequa t e ly addressed.A d e t j u a t e l y addressed.Adequat e ly addressed-A d e q u a t e l y addressed.EPA f i l e observations have been included. It is thepos i t ion of the French Limited T a s k Group that thehorsapan is relevant to the general area surroundingth« French X d m i t a d sit*, but not to French Limitedi t s e l f .

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S p e c i f i c Cements

Cowiaent No,

91011121314

15

1617

Location ofChanges or A d d i t i o n sNAHANAHANANAPage 2-16rFigure 2-7Page 2-19, andFigure 2-6HANA

18 HA19 Page 3-17

E x p l a n a t i o nAdequat e ly addressed.Adequa t e ly addressed.Adequate ly addressed.Refer to attached Work Plan.R e f e r to attached Work Plan.R e f e r to attached Work Plan.1980 data have been added.

I 9 6 0 data have been added.

Adequate ly addressed.end I&N agree that the two sets of water depthmeasurements are in general agreement. The e f f e c t .of s ludge composi t ion upon the water depthsounding devices is not known.

R e f e r to attached Work Plan.Paragraph addre s s ing TOE has been deleted inresponse to the original continents and in l ight ofthe second comments regarding TOC and TQX whichth« French Limited T a s k Group f e e l s would addnothing of value to the El Report.

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S p e c i f i c Consents

Comment No I j o c a t i o n o fChanges or A d d i t i o n sHAPages 3-20 and 3-22RA

24 Page 3-31, f i r s ttwo paragraphs

Explanat ioa:Adequa t e ly addressed.Refer to response to s p e c i f i c comment 2.Adequat e ly addressed.The analytical result s for this ign i tab i l i ty testper fonaed during the HEI 1984 investigation werereported v erba l ly , and no original writtenlaboratory report is available.The intent of the par t i t i on analyses was to ver i fy thes l u d g e / s o i l i n t e r f a c e beneath the lagoon s ludges toycomparing qual i ta t ive organic concentration tovisual observations. In the 1935 F i e l dInve s t i ga t i on , only "soil" samples wer

9 i- £ 80C

S p e c i f i c Coaunents

Comment Location ofChanges or Addi t i on s26

2728

F i g u r e 5-1,page 5-3NAPage 5-8

29 Page 5-8

3031

NAF i g u r e 5-5,page 5-13

32 Page 5-18

Explanat ionData have been added.

A d e q u a t e l y addressed.A d d i t i o n a l c l a r i f i c a t i o n i s o f f e r e d with A p p e n d i xdata snore c o m p l e t e l y r e f erenced , A more completecorrelat ion between soil contamination andre s i s t iv i ty values around the lagoon will bedeve loped as part of the proposed Work Plan (seea t t a c h e d ) .A d d i t i o n a l c l a r i f i c a t i o n is presented/ morec o m p l e t e l y corre la t ing the text with Figure 5-3.P r o f i l e location numbers were omitted f rom Figure5-3 to preserve c l a r i t y , but can be referenced fromthe f u l l scale drawings ( F i g u r e s A6~l and A6-2) inthe A p p e n d i x .R e f e r to attached Work Plan.The f o l l o w i n g note has been added to Figure 5-5: Someof the deep s t ra t i graphy has been pro j e c t ed from thefence diagram contained in Append ix €f correlated bythe f our de ep borings. «here stratigraphy isrepresented without accompanying boring or conesyabols, these data have been projected.*The second d r a f t was intended to c l a r i f y theprevious language set f o r t h in Section 5.3 todescribe a continuous agu i c lude as a part of theBeaumont F o r m a t i o n , It is certainly accurate thatthe B e a u f f l o n t Formation is a mu l t i l i t h i c zone

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L I £80C

S p e c i f i c Comments

Comment Ho. Location ofChanges or A d d i t i o n s

33 Page 5-20

343536

NANAN A

E x p l a n a t i o ncontaining sands, s i l t s , and clays. Section 5*3is meant to describe a continuous clay stratumwithin this f ormat i on which could serve as anaguic iude , prevent ing s i gn i f i can t verticalmigration of waste constituents. The text hasbeen m o d i f i e d to remove the word "regional*, asthis r e f er ence has a p p a r e n t l y caused somecon fu s i on . The 15-foot thick (minimum) claystratum described as an aguiclude has beendemonstrated to be continuous beneath the site andits inaaediate environs, and has also beeni d e n t i f i e d beneath the nearby Sike s site*It is c er ta inly agreed that contaminants do moveat d i f f e r e n t rates through d i f f e r e n t types ofs o i l s , which is probably the reason contaminantshave not reached the d e p t h predicted assuming anaverage permeabi l i ty of the alluvium beneath thelagoon. The method is not intended to be rigoroussince s i g n i f i c a n t l y more data (i.e. a compositep e r m e a b i l i t y va lue) would be required. Rather, itis a "worst case11 assessment to bracket themigration po t en t ia l of waste constituents. Somea d d i t i o n a l c l a r i f i c a t i o n is pre sented, but thedata do not lend themselves to further conclusions.A d e q u a t e l y addre s s ed .A d e q u a t e l y addre s s ed.A d e q u a t e l y addre s s ed .

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S p e c i f i c Coanents

Comment HO. Location ofChanges or Addi t i on s3736

MA

•

ExplanationA d e q u a t e l y addressed.The sole purpose of the leachate impact evaluationwas to determine whether the organics present ins l u d g e leachate could adversely a f f e c t thepermeabi l i ty of the in situ clays forming theaguiclude beneath the site. As such, there vas noat t empt to achieve equilibrium conditions,necessary to calculate organic adsorption capacityof the soils. The addi t ion of a normalized soiladsorption rate and the attendant conclusionsdrawn from those data is believed to be thegreatest extent to which the data can beu t i l i z e d . To that extent, the original s p e c i f i ccomments are addressed as f o l l o w s :l< Figure 5-6 provides the jaost cosipleteadsorption isotherm data available, eventhough equilibrium was not achieved.2. As discussed in the report, no analyses wereperformed on the leachate to determine itschesdcal composition. It is not surprisingthat the passage of one pore volume ofleachate would indicate partial breakthrough,since d i sp lac ement of the pore volume byleachate was the intent of the test. Hadbreakthrough not occurred, we could not beconf iden t that the impact o± organicconst i tuents on the c lay p e r m e a b i l i t y Masassessed.

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S p e c i f i c Citmtt nta

J f i o Location ofCbanqes or Additionsof the leachate was not measured;however, alkal ine leachates t y p i c a l l y migrateat lover rates than acidic leactetes.H o r a a l i z i n g adsorption rates to soil weightused in the two tests demonstrates siailaradsorption properties , with the d i f f e r e n c e s indata p l o t s attributable to initial organic

S .

It is 1 ikely that low solecular weightalcohols and r pos s ib ly, chlorinated solventsare the initial constituents contributing toTOC breakthrough. No data are available toconf irm this theory, and the data do notrelate to any observed contamination in toelower aquifer.S u f f i c i e n t organic contaminants were app l i edto the clay sasple in the permeability testsuch that if an iapact of orgaaics on clayperaeabi l i ty would have occurred, it wouldhave been observed. The conclusion readied isthat peraeabil ity of the aquic ludf i is not« f f o c t « d by organic constituents l i f c e l y to bepresent in any leachate from tbe FrenchLiaited lagoon.M e t a l s t y p i c a l l y adsorb onto clay soils andtheir nigration is attenuated so long as thesoil pH value is near or above neutral. Sinceneither pH nor netals concentrations were

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s p e c i f i c n mmt nitsno* location ofChanges or Addi t i on s

3940

41424344

45464748

KATable 6-3,6-3 and 6-4KAKAKAPage 6-9, 4

KAXA

Explanat ionaeasured under the purpose of this test, no f inalconclusions regarding aaetals adsorptioc caxa be xtraaraf ron the data.Befer to attached Work Plan.Data suppl i ed by EPA have been added.

Adequately addressed.Adequate ly addressed.Adequately addressed.

Hoveaaber 1, 1965 LRH letterm o d i f i e d perreceived in Harch 1986.Adequately addressed.Refer to attached H o r f e Flan .Adeojua t e ly addressed.GM-l and df-4 are ault iple-zone ccoBplctiora well sand, there fore , s lug test data froos these wells arenot usable. If GH-6 did have a cracked casing, thenit could also di sp lay aultiple-zone ccapletioncharacteristics and, therefore, these data were notused.

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S p e c i f i c ConventsCocaaent Ho. Location ofChanges or Addi t ions

4950

51

52535455/56

MA

MA

ExplanationAdequately addressed.Refer to attached Work Plan.HOTE: There are no written f i e l d data for t&eo p t i H U H punping rate determination. Thisevaluation was accomplished by observing tbepunping rate at which the pump lost suction andthen reducing this rate s l igh t ly tor the ******'!pUBping test.Revised Groundwater F l o w Bate Calculat ion sheet isprovided.Adequately addressed.Adequately addressed.Refer to attached Work: Plan.RB! has reviewed the M a n u f a c t u r e r ' s w>mv>1s andvarious li terature sources regarding interpretivetechniques for resistivity (conductivity) data.Me do not believe that other data reductiontechniques would provide any more usefulin format ion , but would welcome any sp e c i f i csuggestions for consideration. Since dry weatherconditions have occurred in the last severalnonths, addi t ional f i e l d resistivity data havebeen obtained and are currently being reduced andinterpreted. Revisions to Section S.o will be

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S p e c i f i c CementsLocation ofCoaaaent No. Changes or A d d i t i o n s

575859

NANANA

6061€ 263646566

NANANANANANANA

Explanat iondeve l oped over the next few weeJcs based upon theseaddi t ional da ta , and will be submitted for EPAreview.Adequat e ly addres sed.A d e q u a t e l y addres s ed.See discuss ion in response to Comment No. 24,A l s o see T a b l e s 3-3 and 3-4 relative tocontaminant concentrations associated with thepercent o^-ganics in contaminated soils.Refer to attached Work Plan.R e f e r to attached Work Plan.A d e q u a t e l y addres sed.Refer to attached Work Plan.A d e q u a t e l y addressed.R e f e r to attached Work Plan ,Th« water quali ty standards presented iia the textare not based upon a risk assessment which is tobe provided in the fu tur e as a separate document.That document would be the more appropriate formatfor presenting addi t ional health relatedcriteria. The discussion in the text was only

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V f f

illS p e c i f i c Comments

Cogent No. Location ofChanges or A d d i t i o n s

6768

697071

72

i

NAFigure 11-2,page 11-12NANAPage 11-17,paragraph 4

NA

73 T a b l e 11-3,Page 11-19

E x p l a n a t i o nintended to provide guidance as to the magnitude ofgroundwater contamination- For purposes of tbe Kt rwe believe it is adequate.Please r e f er to response to Coaunent No. 32.Changes for c l a r i f i c a t i o n have been made to Figure 11-2Refer to attached Work Plan.Refer to attached Work Plan.Refer to attached Work Plan.Reference to A p p e n d i x 6 ca l cu la t i on s has been added.

The Phase I and Phase II RMCL's announced by £PA oftOctober 11, 1985 are l i s t e d in T a b l e 11-2 for thosecompounds f ound in concentrations greater than theH M C L ' s , T h e de s ignat ion "French Limited Alluvial2one" in the t i t l e of the table is consistent withthe nomenclature used throughout the RI Report.As a result of our discussions with SPA and IAK, thevinyl chloride concentration of 3,2 ag/1, with ananalytical recovery range of 0-250%, has beenincluded to r e f l e c t the highest concentration foundin any sazaple from G W - 2 5 .

74 Adequa t e ly addressed.

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VZZQQC

S p e c i f i c Consents

Coaaent757677

7879808182

83

Location ofChanges or Addit ionsHAHAPage 11-23,paragraph 1

HAHAHA

Page 12-2

ExplanationRefer to attached W o r f c Plan.Refer to attached Work F l a n .Grout rod size has been included.

Adequately addressed.Adequate ly addressed.Refer to attached Work Plan.

W i t h respect to present use of the groundwaterresource, this statement is accurate. Thep o s s i b i l i t y of fu ture iapact could depend upon theexistence and e f f e c t i v e n e s s of the alluvialremnant in preventing s i gn i f i can t wasteconstituent Migrat ion into the Riverdale waters u p p l y wel l s if the gradient were to reversedirection. T h i s issue is more f u l l y addressed inthe attached Work Plan.The coament of concern has been m o d i f i e d to betterr e f l e c t conclusions supportable by thedata base.Adequate ly addressed,

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t Ho Location ofObancres or Addit ionsHe? CoMMents, Hay 19861 MA

Explanation

Refer to attached Work Plan.M O T E : QVQC informat ion for the SEO3 PCS analysd.6has not teen forwarded to IAS by £S£.Refer to attached Work Plan.Regarding the calculation of precision for tbenine saaples in table 3-17 of the Q& Report, ttisstatistical parameter was, by de f ini t ion in theQ A P j P , a ooaparison of the aean and standarddeviation of QC replicate analyses. For thosesamples in question, the QC replicate results wereWD (not de t ec t ed) - A statistical cooparison of SBcould be done by assuming that ND is equivalent tozero or the method detection limit.In either case, this would result in avalue of Ot --riaicb is equivalent to perfectreplicate analysis and, therefore, the ultimate inprecision. »e considered, however, thats tati s t ical comparison of non-numerical values wasinappropriate and, therefore, chose not to performsuch a comparison -

Regarding the ETC report f ormat , ETCsamples in "lots" or groups of varying sizes.Fron each sample l o t , SRC's QC department selectsone sample to serve as a "blind QC replicate" aodone sasple for spiking with fcncwn n o n t a a i n a f f a tconcentrations. Since ETC analyzes numeroussanples frov around the nation, any single

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New Consents

Consent Ho. Location ofChanges or Addi t ions

6

910

Table 6-12rpage 6-33

ExplanationW e l l Ho. DateGH-12GW-25REI-3-4REI-7

09-05-8509-05-8510-08-8507-02-8508-30-8508-30-8510-08-85

Elevation ( f t - M S L )-68.90-68,66-68.47-69.19-69.52-69.88-69.71

Reference has been deleted.

See response to s p e c i f i c comments 5 5 / S 6The data from T a b l e 9-1, and the "Stabilized S l a d g eBead-Space* column of T a b l e 9-4 are compared onT a b l e 9-4 under the "Percent Suppression" oolttaoa.These data show that 13 of the 22 compoundsdi sp layed suppressed potential v o la t i l i za t i on , andthat eight other compounds had increasedT o l a t i l i z a t i o n po t en t ia l . T h i s e f f e c t i s typical laacoaaplex Mixtures of v o la t i l e compounds vfcere, underthe lavs of partial pressures, wtten someconstituents* v o l a t i l i t y is s i g n i f i c a n t l y decreased,the vapor phase concentration of others couldincrease. A comparison of the total Bassconcentrations off the coapounds detected shows 6,654u g / i t t t f o r * »t*biliz*tion and 4,842 ug/1 a f t e rs tab i l i za t i on , for a net volat i le s suppression of 27%.

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New Comments

Coraent No.

1112

13

14

Location ofChanges or A d d i t i o n s

NAPage 6-10 andA p p e n d i x 7

NA

E x p l a n a t i o nThe i m p l i c a t i o n s o f this v o l a t i l i z a t i o n suppressionupon l e a c h a b i l i t y is not known. The compounds being" f ixed" appear to be those showing suppression laT a b l e 9-4.Refer to attached Work Plan.Four groundwater contour maps are included for datacollected on 1 1 / 1 / 8 5 , 3 / 6 / 8 6 , 3 / 1 0 / 8 6 , and 6/3/B6,as requested by EPA on May 5, 1986,The ETC letter requested by EPA in April 1986 wassent under separate cover to EPA on June 10, 1986. !See response to new comment 2.

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barcode: *1006778*barcodetext: 1006778