CERTIFIED - RETURN RECEIPT REQUESTEDIn reply refer to 93RC03956

Regional Witter Quality ControlBoard - Los Angeles Region101 Centre Plaza DriveMonterey Pack. CA 91754-2156

Attention: Technical Support UnitCompliance File No. 6027

Subject: February 1993 Monitoring Report Submittal

Reference : NPDES Pltzmit No. CA0001309

Gentlemen :

Pursuant to the referenced permit , Rockwell International Corporation RocketdyneDivision (Rockedyne) hereby submits the enclosed discharge monitoring report for themonth of February, 1993. The enclosed report summarizes atulyrical data collectedduring the discharge of surface water and storm water runoff from the Santa Susana FieldLab (SSFL) through OutfaM 001, 002 , 003. 004,005, 006, and 007 as authorized byNPDES Permit No. CA0001309 . This report also includes a armmary of sewagetreat- .sett plant monitoring activity and rainfall measurement data .

Durinj the month of Februa ry a total of nine rainfall events occurred which resulted in11 .93 inches of rain being measured at the SSFL rain gnuge station. This unusualamount of precipitation resulted in three sampling events at the five northwest slopeoutfall s (003-007 ) and two sampling events for discharges from the SSFL waterreclamation system through outfalls 001 and 002 .

Analytical data for February discharge events indicate several "exceedances" of waterquality objectives for the protection of aquatic life similar to those which occurred inJanuary. In addition, the nowsual amount of precipita ti on impacted sewage treatmentplant operations, r'sulting in periodic instances of effluents exceeding permi trequirements. Attachment 1 includes a discussion of these events and provides follow upinfatuation to Issues raised In the January repo rt. Also, as requested by Mr. King Yu, ofBoard staff, hardness calculations for d►termining effluent limits based on aquatic lifecriteria art included as Atetschment 2. Attachment 3 provides a summa ry of rainfall data,whi le Attachment 4 Is the required summary of monitoring data .

if there are any qques tions regarding this repo rt or Its enclosures, you may contact Mr.Steven R . Ovendale, at (818 ) 586-5945 .

VBNA0356144 1

HDMSE00657303

V= yne Letter, 93RC0395615 April 1993page

Pared under

al of law that this document and all attache is were 1 ed

I my life under Penty

sloe in accordance witha system designed to a suee that Qu

e p~IY gather and evaluate the information submittedl.

ons who manage the systemu or those persons

Based on my ulry of fire pason the otma rnation submitted is, to th e

10 thering trop, the o

owl gear belief, trot. accurate , and complete- IBM as are tth of finebest 'ic

nint penalties for submitting false infomtation, tnc uding the p o

and i oonmc ul for know'ng violations .

ccuted on the 15th day of April. 1993 at Canoga Patti

BNA0356144 2HDMSE00657304

IIDI IDI liD ID IIII II IDI DID II IIII IDI DII

ATTACHMENT I

ISSUE - Water Ulity Qbiectives_for Protection of Aau is life

Analytical results for the month of Februa ry Indicate several Instances of allegedexceedances of permit limits established f rom water quality objectives based on thepro tection of aquatic life . Specifically , exceedances of instantaneous maximum and dailyaverage limits for copper , zinc and lead occurred during the discharge of stormwater runoffthrough Outfalls 001 and 002 . It should be noted that these aquatic li fe c riteria aretypically ten times lower than d rinking water standards, or water quali ty objectivesestablished for the protec tion of human health . There were no discharges which exceededthe thirty day avenge limits b~ zed on c ri teria for the protection of human health .

It Is Rocketdyne's position that the RWQCB required application of total recoverable testmethods for determina tion of compliance with heavy metals aquatic life c ri te ria is overlyrestrictive and does not provide an accurate representation of the water quality dischargedfrom the SSFL site . This position is suppo rted by guidance material published by the EPAon implementation of water quali ty objectives. In requi ring the total recoverable method,versus dissolved metals , concentrations of metals which are not readily available as toxiccompounds are being measured . Due to the significant amount of rainfall and subsequentrunoff, large amounts of sediment and organic material are present In the stormwaterdischarge . This material itself contains concentrations of naturally occur ri ng metals whichare the limn contributors to the "exceedances" of permit limits. Due to thesecircumstances and as required by permit conditions , Rocketdyne has initiated a dailysampling of ponds and available runoff for the metals In ques tion. Preliminary data whichincludes both total and dissolved metals indicates "exceedances " only occur whenmeasuring total metals in the presence of significant sediment and organic material .Rocketdyne will present this data and additional informa tion in next months report .

ISSUE- - Smite 31calment Plant ions

As occurred in January , significant rainfall Impacted sewage treatment plant operationsand contributed to periodic instaLces of noncompliance with permit requirements . At STP3, noncompliance with turbidity standards occurred due to Infiltra tion and intrusion into adeteriorated sewer line. Rocketdyne has just completed the design for installation of 1300feet of new sewer line to replace damaged lines . This project Is ex ted to go out forcompetitive bid net month, with construc tion scheduled for July 1993 .

Turbidity standards were also exceeded at the STP I due to the Impact of heavy rainfall . Inaddition , Rocketdyne has identified malfunctioning filter backwash contro ls as contributingto the noncompliance. Due to the faulty controls, filters must be backwashed manually,rather than automatically as desigred . This condition causes upset of the filter media bed,thus lowerin filtra tion efficiency . Roeketdyne has obt ained funding for this pro ect whichIs currently in the design stage . Additional information r arding the status of this projectwill be included in next months report .

In addition , both the previously submitted January report and this February report Indicateexceedances of disinfection requirements concerning total colif'orm in STP

110

BNA03561444HDMSE00657306

effluent. Daily testing for free and total chlorine indicated adequate chlorina tion fordisinfection purposes . however, laboratory results continually indicated the presence ofboth total and fecal eolifonm In late Februa ry. Rocketdyne entered into discussions withthe sub -contracted mic robiology lab conduc ting the coliform analy fis in an attempt toidentify the problem. It was learned that the laborato ry was using test methods andsimple volumes designed for drinking water samples and not those designed for sewagetreatment plant effluent (see attached letter) . The inappropriate test methods wereyielding false results . As a result of this finding, the test method was changed .Subsequent monitoring data indicates consistent compliance with the requireddisinfection standwd has been meieved.

ISSUE - Northwest Slone Radioactivity Monitoring

In the January monitoring report . Rockeidyne reported a laboratory result whichindicated an questionably high value for Sr-90 at Outfall 004 (SRE) . Rocketdyneatt ributed this result to laboratory error/contamination. This position is further supportedby the results of the three storrnwater monitoring events conducted during the month of

hich indicate essentiall y=%71n non-detectable levels of Sr-90, well below dischargeaddition, soil, water. and sediment samples taken fr+1m the surrounding area

an indicated non-detectab le levels of Sr-90. It Is Rocketdyne's &al position that theabnormall high result reported in January was not representative of storrnwater qualitydischarged dhmugh Outfall 004 and should be discounted

Please note that the results of Tritium analyses for the 2118 and 226 sampling eventswere not available at the time of submitting this report. This is due to a tremendousbatddog of stormwater samples at CEP analytical laboratory. Retvlts will be submittedimmediately upon receipt .

BNA0356144 5HDMSE00657307

LAk

ASSOCIATED LABORATORIESON Nas 0"'1 too C; =0 6 t OX W rreea • r14/7714 MPAZ7J4/ 3&1201

April 14, 1993

AQ! 3nvironzwktel Services, Inc .Atln t Tom BrownF.D. Box 3049Costa Kasa , C.A 11262 8

Dear IOC. Drown

per your telephone conversation with our xiorobiologist,IArira Kackin, requrdinq the testing methods for Rockwell'sMater seapla•, the volume vas changed from fifty millilitersto one hundred aillilitars .

After our discussions with Rockwell, we wars notified thewater yes troy their sewage treatment plant ■nd was not aa drinking water sample . Our microbiologist recommendeda serial dilution calif ore teat (using 11 .15-tubes) based onthe above information .

we are sorry for any inconvenience this isay have causedyour ooaepapany. Please feel tree to conta«t us, if you haveany questions.

Sincerely,

by

rWTWC ♦ OO,gULYVMC

MBNA03561446

I IHDMSE00657308

I IBNA03561447

To determine water quality objectives based on the hardnes . (CaCO3) of the discharge,Standard Methods (16th ed.) No. 314 A. "Hardness by Calculation" is used. For eachdischarge , calcium and magnesium concentration are measured and converted tohardness equivalent CaCO3/L.

2!8193 Discharge - QlttfallDO I Sht 002

Ca -18.9 mg/1 Ca - 24.7 mg/iMg-8.0mg/1 MS -7.7mg/1

Hardness (001) - 2 .479(1& .9) + 4.118(8) - 80.137Hardness (002) - 2.479(24 .7) + 4 .118(7.7)

Hardness (001) •2 .479 (18 .4) + 4 .118(6.1) -Haadrtesa (002) - 2.479(24 .7) + 4 .118(7.7) - 102.7

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