5 JANUARY APRCT 9

Transcription

1 NSTALLATON RESTORATON PROGRAM.. STAGE 3 MCCLELLAN AR FORCE BASE PREPARED BY: ( Radan Corporaton Old Placervlle Road D Sacramento, Calforna JANUARY APRCT 9 FNAL COPY HEDUATR AFL/D WRGHT-PATTERSON AFB, OHO RAA Unted States Ar Force.. Occupatonal and Envronmental Health Laboratory (USAFOEHL) Techncal Servces Dvson (TS) Brooks Ar Force Base, Texas

2 RADAN CORPORATON DCN: NSTALLATON RESTORATON PROGRAM STAGE 3 McCLELLAN AR FORCE BASE, CALFORNA HEALTH AND SAFETY PLAN FNAL HEADQUARTERS AFLC/DEV WRGHT-PATTERSON AFB, OHO January 1989 Prepared by: Radan Corporaton Old Placervlle Road Sacramento, Calforna USAFOEHL CONTRACT NO.: F D-4023, DELVERY ORDER NO USAF PROJECT NO.: PRJY CONTRACTOR CONTRACT NO , DELVERY ORDER NO USAFOEHL TECHNCAL PROGRAM MANAGER JERALD STYLES, CAPTAN, USAF, BSC UNTED STATES AR FORCE OCCUPATONAL AND ENVRONMENTAL HEALTH LABORATORY (USAFOEHL) TECHNCAL SERVCES DVSON (TS) BROOKS AR FORCE BASE, TEXAS Old Placervlle Rd./Sacramento, Calforna 95827/(916)

3 REDAN con PON AT104 NOTCE Ths report has been prepared for the Unted States Ar Force by Radan Corporaton for the purpose of adng n the mplementaton of a fnal remedal acton plan under the Ar Force nstallaton Restoraton Program (RP). As the report relates to actual or possble releases of potentally hazardous substances, ts release pror to an Ar Force fnal decson on remedal acton may be n the publc's nterest. The lmted objectves of ths report and the ongong nature of the RP, along wth the evolvng knowledge of ste condtons and chemcal effects on the envronment and health, must be consdered when evaluatng ths report, snce subsequent facts may become known whch may make ths report premature or naccurate. Acceptance of ths report n performance of the contract under whch t s prepared does not mean that the U.S. Ar Force adopts the conclusons, recommendatons, or other vews expressed heren, whch are those of the contractor only and do not necessarly reflect the offcal poston of the Unted States Ar Force. Copes of ths report may be purchased from: N tonal Techncal nformaton Servce '5 Port Royal Road Sprngfeld, VA 22161

4 REPORT DOCUMENTATON PAGE a & REPORT SECURTY CLASSFCATON lb. RESTRCTVE MARKNGS Unclassfed N/A Za. SECURTY CLASSFCATON AUTHORTY 3 DSTRBUTON, AVALABLTY OF REPORT *N/A 7b. DECLASSFCATON / DOWNGRADNG SCHEDULE N/A 4. PERFORMNG ORGANZATON RLPORT NUMBER(S) 5 MONTORNG ORGANZATON REPORT NUMBER(S) N/A N/A 61. NAME OF PERFORMNG ORGANZATON f6b. OFFCE SYMBOL 7a NAME OF MONTORNG ORGANZATON Radan Corporaton j ce USAFOEHL/TS 6r. ADDRESS (Cry. State, and ZP Code) 7b ADORESS(Cty, State, and ZP Code) Old Placervlle Road Brooks AFB, Texas Sacramento, CA Ba. NAME OF FUNDNG /SPONSORNG lb OFFCE SYMBOL 9 PROCUREMENT NSTRUMENT DENTFCATON NUMBER ORGANZATON (f applcable) USAFOEHL/TS F D-4023 Sc. ADDRESS (Cty. State., aod ZP Code) TO SOURCE OF FUNDNG NUMBERS Brooks AFB, Texas PROGRAM PROJECT TASK WORK UNT ELEMENT NO NO NO ACCE NO 11 TTLE (nclude Securty Casfcaton) Health and Safety 12 PERSONAL AUTHOR(S) Radan Corporaton l. TYPE OF REPORT 113b TME COVERED 14 DATE OF REPORT (Year, Month, Day) 1 s PAGE COUNT Draft Copy FROM / TO /8 8 88,5,19 92 SUPPLEMENTARY NOTATON 77 COSAT CODES 1B SUBJECT TERMS (Contnue on reverse f necesary alnd dentfy by block number) FELD G To be completed. 19 A',VTACT (Contnue on reverse f neces ary and dentfy by block number) Ths document contans the Health and Safety Plan to protect the health and safety of workers conductng currently antcpated aspects of Remedal nvestgaton/feasblty Study (R/FS) work tasks at McClellan AFB. Ths Health and Safety Plan s desgned to ensure that all work tasks assocated wth the R/FS are completed n a safe manner and n accordance to the Occupatonal Safety and :ealth Admnstraton (OSHA) 29 Code of Federal Regulatons Ths plan s wrtten based on the gudelnes outlned n the Occupatonal Safety and Health Gudance.1anual for Hazardous Waste Ste Actvtes (October 1933) prepared as a jont effort by the Natonal nsttute of Occupatonal Safety ana Health, OSHA, the U.S. Envronmental Protecton Agency, and the U.S. Coast Guard and n accordance wth OSHA Standards for General ndustry, 29 CFR , Hazardous Waste Operatons and Emergency Response. /11,. " " - _ 320. DSTRBUTON /AVALABLTY OF ABS1 AACT 121 ABSTRACT SECURTY CLASSFCATON N UNCLASSFED/JNLMTED 0 SAME AS RPT ]OTC USERS Unclassfed 22a. NAME OF RESPONSBLE NDVDUAL 22b TELEPHONE (nclude Area Code) 22c OFFCE SYMBOL R.C. Ostraat, Lt. Col., USAF. BSC (512) USAFOEHL'TS &)D FORM 1473, B4 MAR 83 APR edton may be used untl exhausted SECURTY CLASSFCATON OF 'HS PAGE All other edtons are obsolete. UN CLASS F ED,-

5 RADAN PREFACE Radan Corporaton s the contractor for the R/FS program at McClellan AFB, Calforna. Ths work was performed for the USAF Occupatonal and Envronmental Health Laboratory (USAFOEHL) under USAF Contract No. F D-4023, Delvery Order Ths Health and Safety Plan was developed to assure that Remedal nvestgaton work s performed n a safe manner and n accordance wth proper measure to protect the health of the workers nvolved. Ths plan covers feld work for the currently envsoned tasks wth provson for modfcaton for and future actvtes not covered. Key Radan project personnel were: Nelson Lund - Contract Program Manager Jack D. Gouge' - Delvery Order Manager Clve Mecham - Waste Management & Health Rory Morgan - Health & Safety Engneer The work presented heren was accomplshed between November 1987 and December st Lt. Jerald Styles, Techncal Servces Dvson, USAFOEHL s the Techncal Program Manager. Approved: _ - 3 Ason H. Lund Clve Mecham, C..H. Rort. Morgan r 3 Acceson For NTS CRA& OTC TAB 0 Unannounced 0 3 By, Dstbuton Justfcaton Dst Avalablty Codes 3Avad ad or $peclal 1 U 4 Q

6 Secton TABLE OF CONTENTS Pae NTRODUCTON R/FS Actvtes Responsbl s Key Personnel Project Safety Offcer Responsbltes On-Ste Safety Offcer Responsbltes Feld Task Leader Responsbltes Subcontractor Responsoltes Feld Team Responsbltes GENERAL STE NFORMATON Ste Hstory/Descrpton CONTAMNANT CHARACTERZATON U 3.1 Summary of Materals On Ste Groundwater Samplng Data of Specfc Compounds Sol Samplng Data of Specfc Compounds Hstorcal Personal/Area Ar Samplng Data Summary of Health Effects of Specfc Substances HAZARD ANALYSS Physcal Hazards Chemcal Hazards MONTORNG PROGRAM Photoonzaton Detecton Drect-Readng Detector Tubes Vapor Badge Montorng Nose-Level Montorng

7 U U RADAN COOPO.ATON TABLE OF CONTENTS (Contnued) Secton Page CHLORNATED HYDROCARBON HAZARD CRTERA PERSONAL PROTECTVE EQUPMENT STE CONTROL AND WORK ZONES Work Zones Buddy System Decontamnaton Procedures EMPLOYEE/CONTRACTOR TRANNG Health and Safety Tranng MEDCAL CONSDERATONS General Medcal Survellance Project-Specfc Medcal Survellance EMERGENCY RESPONSE PLAN njures Emergency Equpment Needs Operatons Shutdown Fre and Exploson Response Procedures RECORD-KEEPNG REQUREMENTS HEALTH AND SAFETY CERTFCATON FORM EMERGENCY TELEPHONE LST APPENDX A - Ste Summary Tables... A- APPENDX B - Ste Safety Audt Checklst... B-1 ADDENDUM - Health and Safety Plan Ar Montorng 3 Well Samplng... Addendum- 3

8 RADAN CONVOWATON LST OF TABLES Table 3-1 Hazardous Compounds Present at McClellan AFB, Based on Hstorcal Groundwater and Sol Samplng From Hghest Concentratons of Specfc Compounds Detected n Groundwater at McClellan AFB, 6/85 Through 12/ Hghest Concentratons of Specfc Compounds Detected n Sol Samples at McClellan AFB, 10/84 Through 9/ Chlornated Hydrocarbon Crtera and Response Gude Use Gudelne For Personal Protectve Equpment U U

9 LST OF FGURES F vgure 1-1. Project Organzaton Chart Geographc Desgnatons of the Study Area, McClellan AFB Pag~e

10 RAAN C 0a O RAT an 1.0 NTRODUCTON The long-range objectves of the McClellan AFB Remedal nvestgaton/feasblty Study (R/FS) are to assess the extent and magntude of contamnaton from past hazardous waste dsposal and spll stes, and to develop remedes consstent wth the Natonal Ol and Hazardous Substances Contngency Plan (NCP) for those stes that pose a threat to human health or welfare, or the envronment. Ths Health and Safety Plan s desgned to 3 ensure that all work tasks assocated wth the R/FS are completed n a safe manner and n accordance to the Occupatonal Safety and Health Admnstraton 3 (OSHA) 29 Code of Federal Regulatons (CFR) , nterm Fnal Standard for Hazardous Waste Operatons and Emergency Response (51FR45675, December 19, *1986). Ths Health and Safety Plan outlnes the bass of a safety program desgned to protect the health and safety of workers conductng all aspects of R/FS work tasks at McClellan AFB. All Radan employees and ts subcontractors wll follow ths plan. Varances wll be cleared through the Radan Project Safety Offcer, Rory W. Morgan, pror to mplementaton. Ths plan s wrtten based on the gudelnes outlned n the ccupatonal Safety and Health Gudance Manual for Hazardous Waste Ste Actvtes (October 1985) prepared as a jont effort by the Natonal nsttute of Occupatonal Safety and Health (NOSH), OSHA, the U.S. Envronmental 3Protecton Agency (EPA), and the U.S. Coast GuaJ and n accordance wth OSHA Standards for General ndustry, 29 CFR , nterm Fnal Standard Hazardous Waste Operatons and Emergency Response. The plan s desgned to address general health and safety ssues assocated wth the overall mple- 3mentaton of dentfed R/FS work tasks. When more specfc work actvtes are dentfed that warrant specal or unque health and safety procedures, Health and Safety Plan Addendums wll be wrtten and ncorporated nto ths U McClellan Health and Safety Plan. The Radan Project Safety Offcer wll make the fnal assessment of the need for an addendum and wll wrte Health and /JKS 1-1 MCC/H&S

11 RAM"A 3 expand health and safety coverage of specfc actons not covered n Secton Safety Plan Addendums for specfc work actvtes. Addendums wll serve to The contnuaton of Secton 1 dentfes the actvtes that wll occur durng the McClellan AFB R/FS and the responsblty of the ndvduals conductng those actvtes. Secton 2 descrbes the ste hstory and descrpton of McClellan AFB that led up to the requrement for establshng the 3 McClellan R/FS. Secton 3 characterzes the contamnants that have been dentfed at McClellan AFB from past groundwater and sol samplng efforts. 3 Secton 4 evaluates the physcal and chemcal hazards assocated wth the actvtes performed at McClellan AFB as outlned n Secton and the contamnants dentfed n Secton 3. Sectons 5 and 6 dentfy the procedure that wll be followed, va the montorng program and the chlornated hydrocarbon hazard crtera, to establsh what protectve equpment wll be requred. Secton 7 presents these protectve equpment requrements n Sthe carryng out the varous work actvtes at McClellan AFB. Secton 8 outlnes ste control and work zones that wll be establshed durng all work actvtes at McClellan AFB. Employee tranng, medcal consderatons, and 3 emergency response plans are outlned n Sectons 9, 10, and 11; and all necessary records cted n these three sectons are presented n Secton 12. S1.1 R/FS Actvtes 3 The Health and Safety Plan s wrtten to support feld nvestgaton actvtes whch nclude: pathway characterzaton, hydrogeologcal assess- 3 ment, and base-wde ste characterzaton. ndvdual tasks assocated wth the prevous mentoned actvtes nclude: antcpated geophyscal loggng; groundwater, surface water, sol, sol-vapor, and ar samplng; well drllng and nstallaton; and cuttngs dsposal and ste management (ncludng permts, work logstcs, access, dsposal of cuttngs, etc.). Groundwater samplng and analyss actvtes are addressed n Addendum of ths Health and Safety Plan. Addendum 1 was wrtten n 1985 and has been n use for quarterly montorng well samplng snce that tme. to be used for groundwater samplng actvtes. Addendum wll contnue /JKS 1-2 MCC/H&S

12 RAD4AN CORPORAlON 1.2 Responsbltes The prme responsblty for employee safety wll rest wth: (1) Radan for ts own employees; (2) Radan's subcontractors for ther employees; and (3) wth other partes whose employees wll work under Radan's techncal drecton. All partes partcpatng n on-ste work wll comply wth all requrements set forth n ths Health and Safety Plan. Addendums shall be developed and attached to ths plan for specfc work actvtes not covered 3 n Secton.. As the remedal nvestgaton develops, Health and Safety Addendums shall be ncorporated nto ths plan and compled wth as stated above. Radan, ts subcontractors, and other partes partcpatng n on-ste work also wll comply wth all applcable requrements of the Occupatonal Safety and Health Admnstraton Code, specfcally 29 CFR Key Personnel The Radan project team organzaton, presented n Fgure 1-1, conssts of admnstratve and techncal personnel wth experence n the areas pertnent to the R. Radan and subcontractor personnel who wll have overall respons- * blty for the safe operaton of ths project are: 0 Project Manager: Morey Lews, Radan U Project Safety Offcer: Rory W. Morgan, Radan * On-Ste Safety Offcer: Barbara St. German 6 Feld Task Leaders: Ambent Ar Montorng, Sol Vapor & Sol Samplng: Clark, Radan; Surface Water & Sedment Samplng: Mke Boulay, Radan; Well Drllng & nstallaton: Art Morrll, Radan; Groundwater Samplng: Tyler Thompson, Radan. John /JKS 1-3 MCC/H&S

13 T ++l,, 2 +,!.+ t l El - m + "..2 ;'!" -- ~

14 CONVOWAT*N Fnal selecton of subcontractors for drllng and waste transport/dsposal has not yet been made. Therefore, key safety personnel wth these frms cannot be dentfed at ths tme. All non-supervsory personnel employed by Radan or ts subcontractors wll be responsble for mmedately expressng to a supervsor ther concerns relatng to health and safety. The On-Ste Safety Offcer wll report to the Project Safety Offcer who wll have overall authorty for mplementng changes and mplementaton of ths Health and Safety Plan Project Safety Offcer Responsbltes The responsbltes of the Project Safety Offcer, Rory W. Morgan, 3 wth respect to safety, are: U Sntate contact wth McClellan's Safety Offcer, Ron Camber and test the emergency phone numbers to ensure ther accuracy (see page 12-3 for emergency telephone numbers); 0 mplement the ste safety tranng program as descrbed n ths 3 plan; 0 Mantan the Health and Safety Program Fle n the Project Fle at the Radan Corporaton offce; U * Develop and wrte Health and Safety Addendums; *. Approve any changes or modfcatons to ths plan; and Revew and confrm wth the On-Ste Safety Offcer any changes n personal protectve clothng or respratory protecton requrements /JKS 1-5 MCC/H&S

15 _ RADAN CONVOWATlON _ On-Ste Safety Offcer Responsbltes are: The On-Ste Safety Offcer's responsblty, wth respect to safety, Conduct and document daly Health and Safety Meetngs n the On-Ste Tranng Log of the safe work practces that wll be performed n accordance wth the scheduled actvtes; * Observe ste actvtes to ensure the proper use of ar montorng nstrumentaton and avalablty of applcable personal protectve equpment; Establsh and ensure complance wth ste control areas and procedures; and " Perform on-ste montorng actvtes, e.g., heat stress, arborne volatle organcs and nose montorng Feld Task Leader Responsbltes safety are: The responsbltes of the Feld Task Leaders wth respect to Locate support facltes n an area removed from the potental contamnated areas and stes of sol dsturbance; * Coordnate actvtes wth the Envronmental Management to bref buldng montors when workng near ther buldngs; Ensure that work schedules, dependent on work levels and outsde temperatures, are set each day and adhered to throughout the day; /JKS 1-6 MCC/H&S

16 * RAMAN * ntate outsde emergency phone calls when njures or accdents requre medcal attenton (see page 12-3 for emergency telephone numbers); Ensure that the feld teams observe safe work practces and performs daly actvtes n accordance wth ths Health and Safety Plan; 3 Ensure that safety equpment s mantaned properly; * Report volatons and complance problems to the Radan Project Safety Offcer; and Conduct and document daly Health and Safety meetngs n the On-Ste Tranng Log of the safe work practces that wll be performed n accordance wth the scheduled actvtes Subcontractor Responsbltes to safety, are: The responsbltes of the Subcontractor Supervsor, wth respect * Ensure crew complance wth ths Health and Safety Plan; and * Enforce correctve acton under the drecton of the Radan Project Manager and/or Project Safety Offcer. Complance * problems and safety concerns wll be brought to the attenton of the Subcontractor Supervsor, who wll be expected to correct the safety problems mmedately and respond to the Radan Project Manager and/or Project Safety Offcer regardng * such correctons /JKS 1-7 MCC/H&S

17 _ CONVOWAVON RAMAN _ Feld Team Responsbltes The responsbltes of the feld team members are: Read, understand, and sgn the Health and Safety Certfcaton form n ths plan; * Perform work safely; * Report any unsafe condtons to ther mmedate supervsors; and Be aware and alert for sgns and symptoms of exposure to ste contamnants and/or heat stress /JKS 1-8 MCC/H&S

18 RAAN CONPOWAT0ON 2.0 GENERAL STE NFORMATON 2.1 Ste Hstory/Descrpton McClellan Ar Force Base (AFB) covers 3,745 acres wthn rregularly confgured boundares approxmately 7 mles northeast of downtown, Sacramento, Calforna's captol cty. McClellan les wthn Sacramento County, adjacent to cty lmts to the west and southwest and bounded by the unncorporated areas of Ro Lnda/Elverta to the northwest and North Hghlands to the east. Most of the land surroundng McClellan s low-densty resdental. The closest resdences le just outsde base boundares n three drectons (the area mmedately south of the base s prmarly commercal/ndustral). Twenty schools are located wthn about 1.5 mles of the base. Parks n the vcnty nclude the golf course known as Del Paso Park due south of the base l and Ro Lnda Park, about 1.5 mles to the west. Fgure 2-1 shows the base n relaton to ts neghborng communtes. McClellan served as a bomber depot durng World War, swtchng to a jet fghter mantenance depot n the early 1950s. Today McClellan operates as an Ar Force Logstcs Command Center. t employs approxmately 23,000 mltary and cvlan personnel for operatons that relate to the management, mantenance, and repar of varous arcraft and electroncs and communcatons equpment. Specfcally, under the Sacramento Ar Logstcs Center s the Ar Force's Technology Repar Center for hydraulcs, flght control accessores, ground communcatons, and electronc components. Due to ts prmary msson to mltarly defend the Unted States through the operaton and mantenance of arcraft, the Ar Force has long been engaged n a varety of operatons that requre the use of toxc and hazardous materals. Some of the hazardous materals that have been used on the base nclude: ndustral solvents and caustc cleaners, metals from electroplatng waste, ols contamnated wth polychlornated bphenyls (PCBs), contamnated jet fuels, low-level radoactve wastes, and a varety of ols and lubrcants. MCC/H&S /JKS 2-1

19 *R N HR NORTH WEST AREA AREA ( ARENMcCLELLAN (aafb * ~AREA mc C T N:S.AE AA ARASUTES ~s- = N FEET A 8NAV8ONRS F ASOSOSL CE STORAGE STES - - OUNOARES OF OFF-BASE AREAS STREAMS Fgure 2-1. Geographcal Desgnatons of the Study Area, McClellan AF'B 1 2-2

20 COUPONATON 3 Hstorcally, most of these wastes were bured n pts along the western edge of the faclty. Today, these wastes are ether placed n drums and transported to an approved Class dsposal ste off base or dscharged nto the base's ndustral Wastewater Treatment Plant (WTP). Sludge from the WTP also s transported to an approved Class dsposal ste. McClellan AFB has, n the past, dsposed of ts waste n a varety of ways from bural pts (refuse, demolton materal, excess mltary equpment, chemcals, etc.), sludge/ol pts, burn pts (refuse, ol, chemcals, etc.), to landflls. ndustral waste sludge also was dsposed of on base at the Class - ste approved by the Central Valley Regonal Water Qualty Control Board. Ths practce has snce been elmnated. The ndustral waste sludge was known to contan hgh concentratons of tetrachloroethylene (PCE), trchloroethylene (TCE), chloroform, and l,l,2-trchloro-2,2,l-trfluoroethane. These types of materals also may have been dsposed of n the sludge/ol pts. Durng the 1940s, TCE and other solvents were dumped nto pts and burned. n the 1950s and early 1960s, the base tred to dstll TCE and reuse the chemcal on base. Ths proved unsuccessful and sgnfcant amounts of TCE wastes contnued to be dsposed of n the burn pts. TCE use contnued untl the late 1970s, when t was phased out because of ar polluton concerns. Other cleanng solvents were substtuted for TCE. n 1976, McClellan began dsposng of all of these wastes at off-base state-approved landflls or reclamaton processes. n late '978, TCE use on base was banned. n 1981, McClellan stopped dsposng ndustral wastewater sludge on base. After 1981, McCle--n lmted on-base dsposal to small amounts of demolton debrs, sewage grt, and treated ndustral wastewater. n 1979, base offcals began to suspect that these past dsposal practces could be harmng the groundwater. A study conducted at the end of that year dsclosed that at least four areas of groundwater contamnaton /JKS 2-3 MCC/H&S

21 generated on base needed to be explored n more depth. shown on Fgure 2-1 and are dentfed as Areas A, B, C, and D. These four areas are Area A. Area A, n the southeast porton of the base, s where Base Wells 1, 2, and '2 were closed due to TCE contamnaton. Area B. Located n the southwest porton of the base, Area B s where low levels of TCE have been found n Base Well 18. t s close to the 3 area where a prvate well and Cty Well 150 were closed n 1979 due to TCE contamnaton. Area C. Tn the western porton of the base, Area C ncludes numer- 3 ous past dsposal stes. Uton. Area D. Located n the northwest porton of the base, Area D ncludes the past sludge/ol dsposal pt stes. Area D also s near the off-base area where several prvate wells were closed due to TCE contamna- Today McClellan has dentfed and nvestgated 68 potental waste stes, and dentfed 86 addtonal potental stes that warrant nvestgaton. Appendx A lsts the 68 nvestgated wastes stes n Table A- and the 86 dentfed addtonal waste stes n Table A-2. Major cleanup actvtes to date nclude constructon of a clay cap over Area D to prevent percolaton, nstallaton of a groundwater extracton and a treatment system n Area C, nstallaton of over 100 montorng wells on and off base, and dentfcaton of further programs to remedate all contamnaton-posng threats to human health or the envronment. 1 Acknowledgng the multtude of waste dsposal actvtes on base over the years, McClellan n ts entrety was recommended for the Natonal Prorty Lst of hazardous waste stes, makng t elgble for remedal acton under the Federal Superfund program. As a federal faclty, McClellan AFB s takng the lead n nsttutng the R/FS /JKS 2-4 MCC/H&S

22 CORWOMATON 3.0 CONTAMNANT CHARACTERZATON Ths secton descrbes health and safety hazards that may be encountered due to ste condtons and the presence of hazardous materals detected n groundwater and sol samples. 3.1 Summary of Materals On Ste Extensve data have been gathered durng groundwater and sol ). Compounds detected from the groundwater and sol samplng and analyss samplng and analyss efforts especally over the past two years (1985 to efforts are lsted n Table Groundwater Samplng Data of Specfc ComDounds The hghest concentratons of specfc compounds above the Calforna Department of Health Servces (DOHS) acton levels, and where applcable, U.S. EPA Prmary Maxmum Contamnant Levels (PMCLs), detected durng groundwater montorng at McClellan AFB from June 1985 to December 1987 are * presented n Table 3-2. These results represent only a small percentage of the total sample pool taken durng ths perod. The majorty of the groundwater samples contaned contamnaton levels for the specfc compounds below 1000 ug/l. Also mportant to note s that Area D was the locaton where the majorty of these groundwater samples contanng the hghest concentratons * above the acton level were taken. 3.3 Sol Samplng Data of Specfc Compounds * The hghest concentratons of specfc compounds detected by sol samples taken at McClellan AFB from October 1984 through July 1986 are presented n Table 3-3. These samples represent the compounds detected most frequently and at hghest concentraton levels from sol samplng. As mentoned n Secton 3.2 wth the groundwater samples, these results represent only a small percentage of the total sample pool taken durng ths perod /JKS 3-1 MCC/H&S

23 * RAMAN TABLE 3-1. HAZARDOUS COMPOUNDS PRESENT AT McCLELLAN AFB, BASED ON HSTOR- 3 CAL GROUNDWATER AND SOL SAMPLNG RESULTS FROM A. Volatle Organcs Benzene Chlorobenzene Ethylbenzene Methyl ethyl ketone (t4ek),1,2, 2-Tetrachoroethane Tetrachoroethene (PCE) 1,1,1-Trchoroethane (TCA) Trchloroethene (TCE) To luene Styrene Xylenes Chloroform 1, l-dchloroethene Dchlorome thane trans-1,2-dchloroethene l,l-dchloroethane 1,2-Dchloroethane B. Base/Neutral Extractable Orzancs Vnyl chlorde Acenaphthene Ntrobenzene bs(2-ethylhexyl)phthalate Hexachlorobutadne 1, 3-Dchlorobenzene Acenaphthylene Benzo(a)pyrene Benzo (a) anthracene Pyrene Benzo(g,h, )perylene Phenanthrene Chrysene Anthracene 1,2 -Dchlorobenzene Benzo(k)fluoranthene 1,4-Dchlorobenzene D-n-butylphthalate Fluorene Dbenzo(a,h)anthracene ndeno(l,2,3-cd)pyrene 3,3-Dchlorobenzdne nntooehlmn HexahlooetanePolynuc..ear Aromatc Hydrocarbons C. Acd Extractable Oreancs 2,4-Dmethylphenol 2,4, 5-Trchlorophenol D. Pestcdes. Herbcdes. and Polychlornated Bphenyls (PCBs) Arochlor 1254 Chlorodane 3E. Metals Beryllum C adm umn Chromum Copper Mercury Lead Nckel Znc /JKS 3-2 C/&

24 CORPORATON TABLE 3-2. HGHEST CONCENTRATONS OF SPECFC COMPOUNDS DETECTED N GROUNDWATER AT McCLELLAN AFB, 6/85 THROUGH 12/87 DOHS Well Concentraton Acton Level Compound Number Area Date (ug/l) (ug/l) Benzene EW-84 D 10/24/87 26 BL Chromum MW-12 D 10/23/ a l,l-dchloroethene MW-l D 10/27/87 40, ,2-Dchloroethane MW-l0 D 10/26/ Dchloromethane MW- D 0/ 2 7 / 8 7 b 1, Lead MW-1012 NE 11-12/ a Tetrachloroethene EW-73 D 11/03/ C 4 Toluene EW-73 D 10/24/ ,l,l-Trchloroethane MW-11 D 10/28/8g 10, Trchloroethene MW-335 C 7-8/87 52,000 5 Vnyl Chlorde EW-73 D 12/02/87 2,700 C 2 a 50 ug/l s a U.S. EPA Prmary Maxmum Contamnant Level; DOHS has not establshed acton levels for norgancs. b These results ndcate a two-month samplng perod. BL - Compound also detected n laboratory blank. SC - Presence of compound confrmed by second column /JKS 3-3 MCC/H&S

25 RAMAN COWPOWAVON TABLE 3-3. HGHEST CONCENTRATONS OF SPECFC COMPOUNDS DETECTED N SOL SAMPLES AT McCLELLAN AFB, 10/84 THROUGH 9/86 * Concentraton Compound Area (ug/kg) Benzene A 4,100 Chromum D 31:000 a ll-dchloroethene D 6,800 1,2-Dchloroethane C 870 D--'loromethane D L' D 4:500 a Tetrachloroethene D 36,000 Toluene D 330,000 1,1,1-Trchloroethane D 300,000 Trchloroethene D 350,000 Vnyl Chlorde D 15,000 a Concentraton n mg/kg. Reference: Basewde Source Control and Remedal Acton Plan, McLaren Engneerng, July /JKS 3-4 MCC/H&S

26 CORPORATON Also, as descrbed n Secton 3.2 wth the groundwater samples, the majorty of the sol samples wth the hghest concentratons were located n Area D. 3.4 Hstorcal Personal/Area Ar Samplng Data 3 ng data also were used to ad ndvduals responsble for the health and safety of employees n ther selecton of approprate personal protectve Personal and area ar samplng were performed durng bore hole drllng actvtes assocated wth Stage 2-2, 2-4, and 2-5 of the Phase nstallaton Restoraton Program (RP) at McClellan AFB. The ar samplng was performed to determne employee exposure to volatle organc compounds potentally encountered whle drllng montorng wells on base. The ar montor- equpment. Types of measurements and ar samples collected durng Stage 2-2 work ncluded photoonzaton detector (PD) readngs, passve dffuson organc vapor montors, and detector tube grab samples. PD measurements revealed no persstent or sgnfcant elevatons from baselne, at any montorng well stes. A total of 137 detector tube samples were collected for trchloroethene, l,l,l-trchloroethane, perchloroethene, chloroform, and vnyl chlorde. l,l,l-trchloroethane was perodcally detected at trace levels, defned as perceptble color detectable on the tube, but below the stated mnmum detecton lmt for that tube. Two detector tube samples resulted n concentratons of 50 parts per mllon (ppm) for l,l,l-trchloroethane. These samples were collected at well stes 113 and one detector tube sample ndcated a concentraton of 25 ppm for trchloroethane at well ste The other area ar samples taken by detector tube for the varous chlornated solvents ndcated concentraton levels below the lmt of detecton (none detected). Personal breathng zone samples were collected from one employee on each drllng rg (commonly the drller's helper). The samples were collected /JKS 3-5 MCC/H&S

27 RADMAN by passve dffuson organc vapor montors attached to the lapel of the 3 employee's unform. The samples were analyzed for organc solvents and vnyl chlorde, usng NOSH methods. The results from the personal breathng zone samples yelded concentratons from 0 to 2.0 ppm detected for l,l,l-trchloroethane. No other chlornated solvents or vnyl chlorde were detected from the personal breathng zone samples. 3.5 Summary of Health Effects of Specfc Substances The most lkely types of substances expected to be encountered, based on past envronmental and personal samplng data as dscussed n Secton 3.2, 3.3, and 3.4, wll be: l,l,l-trchloroethane, trchloroethene, 1,2- dchloroethane, l,l-dchloroethene, and vnyl chlorde. * followng paragraphs: Health effects of these hazardous substances are summarzed n the. l,l,l-trchloroethane (TCA). TLV ppm. Lke other chlornated hydrocarbons, nhalaton and lung absorpton of TCA vapor n ar s the most mportant and rapd route of absorpton nto the body. The prncpal effect of over-exposure nvolves a general depresson of the central nervous system. At extreme exposure, cardac effects may occur. Chronc toxcty from TCA s very mnor. Unlke other chlornated hydrocarbons, TCA has not been assocated wth clearly evdent lver or kdney damage. Because no evdence of carcnogencty exsts n epdemologc and/or anmal data, trchloroethane s classfed by the U.S. EPA as Non-Carcnogenc for Humans. Trchloroethene (TCE). TLV - 50 ppm. The toxc effects from exposure to TCE are related to a depressant acton on the 3 central nervous system. Acute exposure zo TCE vapors (1000 ppm /JKS 3-6 MCC/H&S

28 EADA COMWOMAT80M for two hours) produces headache and drowsness, and adversely affects coordnaton. n addton, prolonged exposure to hgh levels of TCE results n mucous membrane rrtaton and even 3 depresson of the heart rate. Research ndcates that the kdney and lver are the prmary targets n chronc exposure. Anmal studes even show kdney effects at the subchronc level of exposure. Based on expermental evdence from anmal studes, trchloroethene s classfed by the U.S. EPA as a Probable Human Carcnogen. 5 1,2-Dchloroethane (Ethylene Dchlorde). TLV - 10 ppm. Studes n laboratory anmals ndcate that 1,2-dchloroethane 3 s rapdly and extensvely absorbed followng ether oral or nhalaton exposure. mmedate symptoms of a hgh level acute exposure to 1,2-dchloroethane are central nervous system depresson, and rrtaton of the respratory tract and eyes as well as nausea and vomtng. n addton, clncal evdence of 3 lver and kdney dysfuncton exsts. Chronc low-level exposure may produce ndcaton of CNS depresson along wth nausea and vomtng. Pathologcally, chronc exposure to 1,2- dchloroethane has been shown to damage the lver, kdneys and adrenal glands. Based on laboratory anmal studes, the compound has been classfed by the U.S. EPA as a Probable 1 Human Carcnogen.. l,l-dchloroethene (Vnyldene Chlorde). TLV - 5 ppm. As n the case wth most chlornated organc 3olvents, oral or nhalaton exposure provdes 1,1-dchloroethene wth easy 3 access nto the body. Acute exposure to arborne l,l-dchloroethene results prmarly n central nervous system, depresson wth the assocated symptoms of hampered coordnaton, stupor, drunkeness, and even unconscousness. Chronc exposure, ether orally or through nhalaton Drocedures, has strkngly smlar results /JKS 3-7 MCC/H&S n both cases, the lver and kdneys are the prmary

29 ~RAMAN~ targets. Based on laboratory anmal studes, ths compound has 5 been classfed by the U.S. EPA as a Probable Human Carcnogen. 0 Vnyl Chlorde. TLV - 5 ppm, PEL - 1 ppm. Vnyl chlorde s consdered to have a low order of acute toxcty. Contact of the skn or eyes wth the lquefed gas can produce freezng U and frostbte. Central nervous system depresson wll occur when anmals and man are exposed to moderately hgh levels of 3 the gas. Humans exposed to vnyl chlorde n ar at a concentraton of 6,000 ppm for one-half hour experenced dzzness 3 and drowsness. Ths latter property made vnyl chlorde at one tme a canddate for an anesthetc agent, but other toxcty problems developed at the concentratons necessary for anesthesa. t s also now consdered to be a lver toxcant. Based on epdemologc studes supportng a causal assocaton between exposure to vnyl chlorde and cancer, ths compound has been classfed by the U.S. EPA as a Human Carcnogen /JKS 3-8 MCC/H&S

30 CORPOWAVON 4.0 HAZARD ANALYSS Tasks conducted durng the remedal nvestgaton phase of the R/FS wll nvolve potental rsk to feld and laboratory personnel. The physcal and chemcal hazards, assocated wth the antcpated work actvtes outlned below, wll be analyzed n the followng subsectons. Antcpated work actvtes nclude: 3 nques; 0 Montorng well nstallaton usng hollow-stem augerng tech- Montorng well nstallaton usng ar-percusson drllng technques; 3 * Development and pumpng of montorng wells; 3. Montorng well samplng; Handlng and dsposal of drll cuttngs; 3. Ambent ar montorng, sol vapor and sol samplng; * Packagng and shpment of samples; and * Sample preparaton and analyss of samples. 4.1 Physcal Hazards The general types of physcal hazards assocated wth the work actvtes dscussed above nclude: * Mechancal. Cuts; contusons; beng struck by or strkng 5 objects; beng caught between objects; becomng entwned n rotatng tools; and fallng objects /JKS 4-1 MCC/H&S

31 RAM comvlaton " Electrcal. Possble excavaton of bured cables and exposure 5 of overhead power lnes durng drllng; lghtenng hazards durng electrcal storms; and electrcal shock by electrcal 3 pumpng equpment and electrcal laboratory equpment. * Fre. Possble excavaton of bured gas lnes; grass fres; and equpment fres. 3. Thermal. Exposure to outsde temperature extremes (above 70 Fahrenhet) whle wearng protectve clothng. * Acoustcal. Exposure to excessve nose durng drllng operatons nvolvng hollow-stem augerng and ar-percusson drllng. To ensure employee protecton from these physcal hazards, the followng safety precautons wll be mplemented. * Protectve clothng, as outlned n Secton 7.0, wll be 3 requred durng all routne on-ste drllng operatons. * Durng the plannng/moblzaton phase of the program, the Project Safety Offcer and/or Task Leader shall consult wth base/muncpal personnel about the locaton of utlty lnes and other such underground hazards. All McClellan AFB-requred permts wll be obtaned ncludng weldng, drllng, and radoactve source permts. f drllng cuttngs ndcate the possble presence of underground drums or cylnders, drllng 3 wll be stopped mmedately and the borehole wll be closed. The closure procedures wll be coordnated wth base personnel. * * All movng equpment are road legal vehcles and wll observe all the traffc regulatons at McClellan AFB. Mantenance wll be conducted on a routne (as needed) bass at the work ste or /JKS 4-2 MCC/H&S

32 COMPORATON RADMAN stagng area. Pror to any drllng and mantenance operatons 3 and for overnght securty, the work ste wll be cordoned off wth yellow carton tape and/or reflectve safety flaggng to prevent any vehcle or pedestran nterference wth the work ste. Also, no work ste wll mpede wth any normal traffc ways wthout provdng orange traffc delneators to drect traffc around the workng ste. 3 The On-Ste Safety Offcer or Task Leader must be alert for the sgns and symptoms of heat stress. A hazard exsts when 3 ndvduals are requred to work n warm temperatures (above 70 Fahrenhet) whle wearng protectve clothng. Heat stress montorng wll be performed by the On-Ste Safety Offcer when these condtons are encountered. Feld team members wll also be observed for the followng sgns and symptoms of heat stress: 3 Dzzness; * Profuse sweatng; * Skn color change; - ncreased heart rate, 110 bpm (beats per mnute) as 3 measured by pulse beats, 15 seconds x 4 or 30 seconds x 2; - Body temperature n excess of 00 F, as measured by fever detectors (forehead straps); and Vson problems. Any team member exhbtng any of these symptoms wll be r -oved from feld work mmedately and requested to consume 2 3 to 4 pnts of electrolyte flud or cool water every hour whle /JKS 4-3 MCC/H&S

33 RAAN CORPORATON restng n a shaded area. The ndvdual should not return to 3 work untl symptoms are no longer recognzable. f the symptoms appear crtcal, persst or get worse, medcal attenton 3 wll be sought mmedately. * Feld personnel exposures to nose from drllng actvtes wll be montored usng sound level meters. f nose levels are detected at or above recommended exposure levels ( Threshold Lmt Values*, as establshed by the Amercan Conference of Governmental ndustral Hygensts) for contnuous or ntermttent nose, all personnel potentally exposed to those nose levels wll be requred to wear hearng protecton devces. 3 OSHA 29 CFR , Compressed Gases (general requrements) * All personnel wll follow the safety procedures specfed n when usng gas cylnders. 4.2 Chemcal Hazards The chemcal hazards assocated wth the work actvtes dscussed n Secton 4.0 result from chemcals detected n the groundwater and sol at McClellan AFB. 3 Durng the development, pumpng and samplng of montorng wells, the feld team may encounter contamnants present n the groundwater and sol. Sgnfcantly contamnated sols and groundwater, f encountered, wll produce elevated arborne concentratons and elevated pont source concentratons that are readly detected when samplng splt-spoon sol samples or cuttngs wth drect-readng nstruments. nhalaton of fugtve organc vapors s the most lkely route of personnel exposure n the work area; however, real-tme ar montorng nstruments wll ndcate the presence of vapors before a chronc nhalaton hazard exsts. Snce ar montorng nstruments wll detect /JKS 4-4 MCC/H&S

34 CORPORATON RAA elevated arborne vapor concentratons and elevated pont source concentra- 3 tons before a chronc nhalaton hazard can exst, potental skn absorpton and ngeston exposures are consdered remote. The preparaton of samples for analyss may expose laboratory techncans to routne hazards assocated wth laboratory work. Standard laboratory safety procedures wll be used to prepare and analyze these samples. Partcular hazards arse n the use of corrosve and flammable lquds. 3 These samples should be treated wth care and wll be handled nsde a properly operatng laboratory hood due to ther potentally hazardous nature. 3 the followng safety precautons wll be mplemented: To ensure the employee protecton from potental chemcal hazards,. Protectve clothng wll be requred durng the varous work actvtes, as outlned n Secton An ar montorng program as outlned n Secton 5.0 wll be mplemented to measure arborne concentratons of volatle 3 organc compounds potentally encountered durng on-ste R/FS work. 1 Chemcal-resstant protectve clothng and respratory protecton wll be avalable at all work stes, n the support zone, n the event ar montorng results ndcate the presence of elevated concentratons of organc vapors n ar. U /JKS 4-5 MCC/H&S

35 mr OMPO vtew 5.0 MONTORNG PROGRAM Personnel exposure to hazards and excessve nose wll be montored to ensure that exposures do not exceed acceptable lmts. Arborne contamnaton wll be measured by three methods: (1) photoonzaton usng an HNu detector, equpped wth an 10.2eV lamp; (2) drect-readng Draegere ndcator tubes; and (3) organc vapor detector badges. Nose wll be montored wth contnuous and mpulse sound-level meters, partcularly durng ar-percusson 3 drllng. 3 A member of the Radan ndustral Hygene Staff wll conduct audts to ensure complance wth ths safety plan and to provde any addtonal support requred. Specfc procedures for the montorng program wll be added to ths plan as remedal nvestgatons occur. An audt checklst s ncluded n Appendx B. 5.1 Photoonzaton Detecton An HNu photoonzaton detector (PD) wll be taken nto the feld and operated durng drllng actvtes (one nstrument per rg) and other sol dsturbng actvtes where contamnated sol or groundwater may be encountered. Each nstrument wll be calbrated usng known calbraton gases pror to leavng for the feld each day. and obtaned from Scott-Marrn, nc. (A chlornated span gas wll be used 2001-H Thrd Street, Rversde, CA , ) The approprate HNu detector lamp wll be selected for chlornated speces. 5.2 Drect-Readng Detector Tubes m A Draeger detector tube kt wll be used to determne arborne concentratons of specfc/key contamnants durng work actvtes where HNu Sfor PDs are beng used to screen for volatle chlornated hydrocarbons. Durng drllng or other work, a member of the feld team wll take perodc readngs certan chlornated hydrocarbons as drected by the response crtera (Table 6-1). Detector tubes wll be avalable for: /JKS 5-1 MCC/H&S

36 CON WONAT son * 1,1,1-Trchloroethane; 3. Trchloroethene; 0 1,1-Dchloroethene; 3. 1,2-Dchloroethane; and * Vnyl chlorde. These chlornated hydrocarbons represent the most frequently detected speces reported, based on past groundwater and sol sample analytcal results. 3 The readngs are taken by drawng a known volume of ar through a detector tube and observng a colormetrc ndcaton of arborne concentraton. Measurements wll be taken n areas where the feld team members are workng and at the well-head durng drllng. A log of the detector tube observaton results wll be made part of the permanent McClellan R/FS program fle. The -;me, date, locaton, type of detector tube, any observed color change, and the name of the ndvdual takng the measurement wll be recorded n the program fle Vapor Badge Montorng Personnel exposure to organc vapors wll be montored usng 3M Brand #3520 organc vapor montorso (badges). Only personnel workng closest to the well-head openng wll be montored. The procedures to be followed 3 when usng these montors are: 3 * Open the badge, and remove the plastc cap coverng the charcoal bed. 1 * Mark the date and samplng start tme on the badge. * * Place the badge on an ndvdual who spends the most tme near the well openng (greatest potental of beng exposed to organc vapors) /JKS 5-2 MCC/H&S The badge should be placed on the outsde of

37 RAM AN Son the ndvdual's clothng, near the breathng zone. the collar wll be suffcent). (The lapel 3 The badge wll collect organc vapors automatcally. 0 At the end of the samplng perod (usually eght hours), place the plastc cap on the badge, mark the end of the samplng 3 tme, and forward the badge to the Project Safety Offcer. A representatve number of badges wll be analyzed for 1,1,1-3 trchloroethane, trchloroethene, 1,l-dchloroethane, vnyl chlorde and 1,2-dchloroethene, usng gas chromatography. Drect readng ar montorng data and observatons noted n the feld wll mandate the selecton of badges to be analyzed. The results wll be made part of the permanent program fle. Excessve exposures wll be reported mmedately to the affected ndvdual and hs/her supervsor. 5.4 Nose-Level Montorng 3 Feld personnel exposures to nose durng drllng actvtes wll be montored usng sound-level meters. The procedures to be followed n 3 measurng nose exposure are: " Calbrate the sound level meter usng the calbraton devce provded wth the nstrument. Place the calbrator over the mcrophone and turn t on. The calbratng devce s pre-set 3 to delver a specfc decbel level. Check to see that the nstrument s readng the exact pre-set level. Adjust the 3 sound level meter as requred. After calbraton of the nstrument, set the scales, and record the nose levels at specfc work locatons durng any drllng actvtes suspected of producng excessve nose. MCClH&S /JKS 5-3

38 RAMAN COtwoRATON 0 Nose-level readngs wll be recorded n a log, notng the 3 scale, response settng, tme, date, analyst, type of actvty, U U U ndvduals potentally exposed, and the nose-level readng. These records wll be made part of the permanent program fle..f excessve nose levels are detected, then correctve actons wll be taken as specfed n Secton 4.1. U /JKS 5-4 MCC/H&S

39 RAMA COMPONATON 6.0 CHLORNATED HYDROCARBON HAZARD CRTERA Chlornated hydrocarbon hazard crtera have been developed to assst Task Leaders and On-Ste Safety Offcers n decdng when the use of resprators and Tyvek coveralls may become approprate. Exposure to elevated levels of lornated hydrocarbons presents potental health rsks that need to be properly controlled. Where el.ated 3 exposures persst, respratory protecton wll be the prmary control method to protect personnel from nhalaton of chlornated hydrocarbon vapors. 3 Elevated levels n the ar serve as presumptve evdence of elevated chlornated hydrocarbon levels n the sol or water. The use of chemcally mpervous Tyvek suts, ntrle rubber gloves, and neoprene safety boots wll be the prmary control measure to protect personnel from dermal exposure to chlornated hydrocarbons. 3and 1,2-dchloroethane. Vnyl chlorde gas may also be encountered. The chlornated hydrocarbons potentally encountered durng drllng actvtes are composed of a varety of ndustral solvents, ncludng: 1,l,l-trchloroethane, trchloroethene, 1,l-dchloroethene, 3 These contamnants present lmted exposure potental, requrng mnmal controls at the concentratons expected. n the event personal and area ar montorng efforts detect hydrocarbon concentratons that present the potental for personnel exposure, the use of personal protectve equpment wll be upgraded from U.S. EPA Level D equvalent to U.S. EPA Level C (respratory protecton, Tyvek coveralls, and chemcal resstant gloves and boots). A Chlornated Hydrocarbon Crtera and Response Gude (Table 6-1) has been compled for gudance as to when to upgrade personal protectve equpment and how to determne when to stop work. At any pont that ar montorng results ndcate the need to upgrade personal protectve equpment, that level of protecton also wll become necessary for all subsequent actvtes at that locaton. The McClellan AFB safety offcer wll be notfed /JKS 6-1 MCC/H&S

40 RADAN a a' 0 Ol V TABLE 6-1. CHLORNATED HYDROCARBON CRTERA AND RESPONSE GUDE Chlornated Hydrocarbon Response Concentraton Level (CHC) Response #1 2-5 ppm total Collect detector tube samples for vnyl chlorde CHC by photo- at the well head and at worker breathng zone onzer (BZ) evary 30 mnutes or addtonal 10 feet depth drlled, or untl photoonzer readngs drop below 2 ppm. Ar suppled resprators, TyvekO suts, ntrle gloves, and neoprene boots must be worn by all employees when results by detector tubes for vnyl chlorde and 1,2- dchloroethane are postve when collected at worker's BZ. # ppm Collect detector tube samples at the wellhead total CHC by and at worker breathng zone (BZ) for all photoonzer parameters a every 30 mnutes or addtonal 10 feet depth drlled; or untl photoonzer readngs drop below 5 ppm. Ar suppled resprators, TyvekO suts, ntrle gloves, and neoprene boots must be worn by all employees when results by detector tubes for vnyl chlorde and 1,2- dchloroethane are postve. See #5. # ppm Ar purfyng resprators Tyvek suts, ntrle total CHC by gloves and neoprene boots rust be worn by all photoonzer employees wth the excepton of vnyl chlorde and 1,2-dchloroethane. See #5. Contnue col- 3 lecton of detector tube samples. 3 #4 > 500 ppm Work stops. Contnue collectng detector tube total CHC by samples whle ntatng acton to suppress photoonzer vapors (water spray, contan cuttngs, etc.). Work crew postons themselves upwnd from cuttngs/borehole. #5 > TLV for Ar purfyng resprators, Tyvek suts, ntrle any parameter gloves, and neoprene boots must be worn by all by detector feld team members for all parameters wth the tubes excepton of vnyl chlorde and 1,2-dchloroethane. f vnyl chlorde and/or 1,2-dchloroethane s detected above ther TLV, then ar suppled resprators wll be substtuted for ar purfyng resprators. #6 >10 tmes the Work stops. Suppress vapors. Reevaluate. TLVO for any parameter by detector tubes.21588/jks 6-2 MCC/H&S (Cont nued)

41 RADAN COMPONATON TABLE 6-1. (Contnued) TLVs6 - (Threshold Lmt Values recommended by the Amercan Conference of 3 Governmental ndustral Hygensts for ) 1,1,1-Trchloroethane ppm Trchloroethene - 50 ppm 1,1-Dchloroethene 5 ppm 1,2-Dchloroethane - 10 ppme * Vnyl Chlorde - ppm U U a Samplng parameters are: l,l,l-trchloroethane, trchloroethene, 1,1- dchloroethene, 1,2-dchloroethane, and vnyl chlorde. Vnyl chlorde detector tubes wll be used for detecton of l,l-dchloroethene. Vnyl chlorde tubes respond at 1:1 rato for both contamnants. c 1,2-Dchloroethane detector tubes have a lower lmt of detecton of 100 ppm, and therefore, wll not be used as crtera for response level #5. d Methyl bromde detector tubes wll be used for detecton of 1,2-dchloroethane. These tubes wll detect 1,2-dchloroethane at 50 ppm, whch also s the Occupatonal Safety and Health Admnstraton Permssble Exposure Lmt 29 CFR e Occuptatonal Safety and Health Admnstraton Permssble Exposure Lmt 29 CFR /JKS 6-3 MCC/H&S