# EarthTech 3 0 33 Campus Drive P 763.551. 1 001 Suite 290 F 763 . 551.2499 AT]co lnt m ational

Ltd. Company Minneapolis, MN 5544 1 www.earthtech.com


### Febr uary 21, 2 00 5 Area Engineer, Black HillsArea Offic e U.S. Army Corps o f Engineers 631 Saint Anne Street, Suite 101 Rapid City, South Dakota 57701-4667 Subject: Contract DACW45 -03-D -0032, DO-3 Pride Hangar S

ource Area Treatment/ Updated Work Plan EIIsworth AFB, South Dakota Serial Letter ERS -3 - RA - 158 FXBM 20047001 Dear Mr. Mailander: The purpose of this letter is to present a n updated work plan for the in -situ treatment of trichloroethene (TCE) at the Pride Hangar site source area. Th e Pride Hangar Site and ground water plume are shown in Figure 1. A detail of the TCE source area is shown in Figure 2. Source area treatments were initiated based on high TCE ground water concentrations measured in th e excavation of the former solvent underground storage tank (UST). Stimulation of bio -dechlorination

was select ed for treatment in the saturated soil and ground water, and soil vapor extraction (SVE) was selected for the vadose or unsaturated zone. The status of each treatment and recommendations for co ntinued treatment and monitoring are presented in Sections

2.0 and 3.0. This work plan was sub m i tt ed initially in Serial Lett er No. ERS -03 - RA-149 dated December 21,2004. Comments were receiv ed from South Dakota Department of Environment and Natural Resources (SDDENR) in a lett er dated Janua ry 7, 2005. Those comments, and others, were discussed by the Rem ed ial Project Manager group in a meeting held Janua ry 25, 2005, at EiIsworth AFB . This plan has been revised based on the DENR comments and RPM meeting discussion.Annotat ed co mments are attach ed . 1.0 S C OPE/

_ D PROPOSED MONITORING - IN -SlTU GROUND WATER TREATMENT In -situ remediation of the Pride Hangar ground water source area was initiated to promote bio -dechlorination

of chlorinated

volatile organicco mpounds

(VOCs) in ground

water. The scope of this work was described in a work plan dated September 3, 2003 (Serial Lett er No. 1 -54 - RA -301). This work includ ed installation and initial monitoring

of two new monitoring wells in the target area (MW041101 and MW041102). Injection of emulsified soy oil was performed

after baseline sampling of the new wells and existing well (MW941102). Th e injection points and monitoring

well locations

are shownon Figure

2. 

# 230 0 0 1

# EarthTech A Tyco..Iotematieeal

Ltd. Company 

### Mr . Mark Ma ilander U.S. Army

Corps of Engineers February 21,2005

Page 2 

### Emulsified soy oil was inject ed into the ground water at 14 direct push soil borings within this area during the period January 29 through Februa ry 3, 2004 . Approximately 100 gallons of dilute, emulsified soy oil was injected at each point. A proprieta ry soy oil emulsion concentrate from EOS Re m ediation, Inc. (EOS), was used. This product was select ed due to its perfor m ance at other sites. The EOS product is a concentrat ed , stable emulsion containing soy oil, lactic acid, emulsifier, and vitamins. The inj ection proc ed ure involv ed diluting the EOS concentrate at a 4 to I ratio with water, driving the direct push r od to the depth of co mpetent shale, then injecting as the r od was pull ed up through the saturated zone. It 1 addition to the EOS injection, a culture of known TCE degrading bacteria (purchas ed from Regenesis, Inc.) was injected at two direct push locations near MW041101 and MW041102 in May 2004. This work was pe rf ormed in c oordination with similar work being complet ed at OU -4. Existing monitoring well MW941102 and new wells MW041101 and MW041102 are us ed to monitor the bio -d ec hlorination progress on a monthly basis following injection. Existing well MW941102 is side -gradient of the source area. MW041101 is in the center of the former UST excavation area and MW041102 is southwest of the UST excavation area and the injection area. 1.1 Treatment S

tatus Monitoring results for ground water samples collected from wells MW941102, MW041101, and MW041102 are present ed in Tables 1 through 3 and Figures 3 through 5 for the peri od from pre - injection through January 2005. Monitoring resultsat MW041101 show a rapid initial r ed uction in TCE concentration during the first 3 months followed by slight reduction over the last 8 months. TCE concentration has dropp ed at MW041101 from 16,000 to 1,018 micr og rams per liter (ug/

L). Ground water TCE concentrations at MW041102 show an initial decrease followed by an increase, then a significant decrease with an overall r ed uction from 19,000 ug/ L to 1,270 ug/

L. No signifi ca nt change in ground water TCE concentration was observ ed in side -gradient well MW941102. The increase in TCE concentration at MW041102 may be due to varying ground water flow directions esp ec ially in the summer and fall. At MW041101 and MW041102, ground water concentrations of the first biological reduction pr od u ct , cis -di.c . hloroethene(cis - DCE) were below the detection limit until 6 to 7 months after injectio n . The January 2005 concentrations were 122 and 1,201 ug/ L, respectively. Cis - DCE concentrations at MW941102 remained below 10 ug/ L. Vinyl chloride was not detect ed in any of the wells; however, the detection li m its are above the drinking water s ta ndard of 2 ug/ L (detection limits have ranged from 6 to 1,000 ug/ L). Sulfate concentrations in MW041101 have d ec reased signifi ca ntly from 430 to 35.7 milligrams per liter ( m g/

L) . The variation of su ff ate con c entration with time closely follows the patte rn for TCE. Sulfate concentrations at well MW041102 remain high, ranging from 1,043 initially to 2,350 mg/

L. Sulfate concentrations at MW941102 did not change significantly. 

# 2430 002

# EarthTech ATyco International Ltd. Company M r . Mark Mailander U. S . Army Corp s of En g ineers

Febru a ry

2 1, 2005 Page 3 

### Chemical oxygen demand (COD) monitoring indi cates that sufficient electron donor (soy emulsion) remains at MW041101; however, relatively low concentrations are present at MW041102. The pre - injection and most recent COD concentrations for the two wells are 970/ 7,280 and 14/

2.1 mg/ L, respectively. The COD and sulfate data indicate that the oil injection did not supply a signifi c ant mass of el ectron donorto MW041102. Review of water level data indi cates a northeasterly ground water flow in the source area as opposed to a southeast

flowfor the larger site area, explaining the low COD concentrations

in this southerly

well. The ground

water flow direction

for the source area is presented in Figure 2 based on the March 9, 2004, water level data. The water level will be measur ed each month at all monitoring wells to determine

the ground

water flow direction. In additionto VOC and inorganic ground water monitoring, specific microbiological analysiswas perform ed on ground water sa m ples collect ed from MW041101 and MW041102 on June7,2004. The purpose of this analysis was to measure the concentration of Dehalococ co ides

(DHC), the bacterium proven to be capable of complete bio -d ec hlorination to ethene. Research indi catesthat several types of ba ct eria ca n co nvert TCE to dichloroethene (DCE). However, the DHC bacteria is ne eded to r ed uce DCE to ethene. Polymerase chain reaction(PCR) testing

for numbers

of DHC and target genes per milliliter (mL) was perform ed by Microbial Insights, Rockford, Tennessee . The PCR test results show relatively low concentrations

of DHC (3.22 and 15.5 cells per mL) and no detection of the ta rget genes. Additional microbiological monitoring may be ne eded depending on the changes in VOC concentrations. Recent research has shown the potential for a biologically -assist ed geoche m ical reduction of TCE. Addition

of an electrondonorca n reduce sulfate to sulfide,whi ch reacts with iron naturally present in the saturated soil to generate iron sulfide. Chlorinated solvents such as TCE react with the iron sulfide abioti ca lly, reducing these compoundsa nd releasing chloride ions. No daughter produ ct s such as DCE and vinyl chloride are pr od uced. The mechanism is not fully understood

but is believed

to convert

TCE to acety lene. Both biologi ca land geochemical reduction

of VOCs may be occurring at the Pride Hangar site. The presenceof sulfate ion can impacteach process. In the biological process, sulfate r ed u ct ion co mpetes for

__theavailable electron donor and in the abiotic pr ocess sulfate is desir ed . Decre

_ .ses in sulfate co ncentrations have been observ ed at MW041101 with decreases over 80 percent. Further monitoring is needed to determine the magnitude of each of these processes,

and thus if sulfateaddition is ne ed ed. Either direct biologicalreduction or biologically -assist ed r ed u ct ion via iron sulfide formationwill require a sustain edsource of electrondonor. The January2005 COD monitoring indi cates

that insufficient

electrondonor is present at MW941102 and MW041102 . COD concentrations range from 5.8 -2.1 mg/

L in these wells com par ed to 7,280 mg/ L at MW041101. 

# 2 -30 003

# EarthTech A Tyco International Ltd. Company 

### Mr. Mark Mailander U.S. Army Corps o f Engineers February 2 1, 2005 Pag e 4 1.2 Recom m ended El ectron Donor Inj ection Earth Tech recommends injection o f additional

e l ectrondonoroutsid e the Pride Hangar building, just west o f MWl10402. Four n e w monitoring/

injection wells are propos ed as shown on Figur e 6. Monitoring

w e ll MW941102 may also b e us ed f or inj ection as it is outsid e

th e influ e nc e o f previous injections . Rec ent exp erience at other sites indicates that pulsed inj ection of sodium lactat e at low conc entration is effective in terms of treatment, lateral distribution o f electron donor, and the overall cost o f injection. The f ollowing procedure is recommended on a trial basis:
• Obtain Environm ental Protection

Agency (EPA) approval f or lactate injection. A brief lett er requestingpulsed inj ectiono f sodium lactat e will be submi tt ed to EPA and their approvalwill be requested. In addition, the Draft Explanation

o f Signi f i ca ntDifferences will b e r e

vis ed to includ e

sodiumlactat e inj ection.
• Aft er EPA approval is rec e ived, inject batches of s od ium lactate at 1,000-2,000 m g/ L concentration,

approximately

100 gallons p er well, one to two tim es p er we e k. Th e injectionperi odwill extendf rom March 2005 to March 2006 . • Injection

will b e skipp edf or 2 w ee ks prior to sampling

at MW941102. The proposedinj ect ionproc edur e is describ ed

b e low:
• Fill mobile tank ("water buffalo") with 500 gallons o f non-chlorinated water with no dissolv ed

oxygen.
• A dd s od ium lactate,approximately 0.7-1.4 gallons using a 60 percent solution.
• Inje ct solution by gravity to each well using polypropylene tubing f rom the tank to the bottom o f each w e ll. Th er e are s e

veral sourc es o f dilutionwater f or the injection solution at th e Pride Hangar sit e including

potablewater f rom th e bas e system; e ffluent from the Building

6908 treatment

system; and effluent f rom the BG05 Base Boundarysystem. Each potential water sourc e should be t est ed f or dissolv ed

o xy g en and sul f at e co nc entration to ass ess wat er quality and pretre atment r eq uirements. Chlorine can be removed f rom base wat er by running it through e xisting spare activat ed carbon ca nist ers. Alt ernativ e ly, th e building

69 0 8 effluent could b e us ed i f pr e tr eat ed with s od ium bisulfite

to remove dissolved

oxygen. Addition o f a TCE-degradingculturemay be recommendedi f TCE reductions do not occur a fter sul f ate r ed uction. Earth Tech recommends use o f the KB1 culture by SiREM Laboratory if augmenting is need ed . Previous addition o f a culture f rom Regenesis has not pr od u ce d signi f i ca nt improv ements in tr eatm ent. Alt ernativ e ly, sul f at e may be add ed in addition to s od ium lactate to stimulate the bio-geochemical process. The monitoring resu lt s and the bio-g eochemical

proc ess will b e studi edto d e

te rm in e which augmentation approachto use. 

# 2 30 0 04

# EarthTech ATyco Int m ational Ltd. Co m pany 

### Mr. Mark Mailan d er U . S . Army Corps of Engineers February 2 1, 2005 Page 5 1.3 Reco m m ended Monitoring Scope And Proc ed ures Th e f ollowing new soil boringsand monitoring/ inj ection w e lls are r ecomm ended as part o f this work. See Figure 6 for locations:
• Four injection /

monitoring

wells ar e recommend edw est and south o f MW041102 to b e us ed for injection

o f th e sodiumlactat e solution. Each well will be 2-inch diam e ter, with sch ed ule 40 PVC ris er and screen. Th e wells will b e compl e t ed at the top o f the competent shale and will have a 10-f oot scre en. These wells will be complet ed near grade.
• Three monitoring

wells ar e recommend ed insid e the Pride Hangar. These wells will be used to track th e down-gradi ent progr ess

o f TCE tr eatment (see Figure6). The ground wat er monitoring scope will include initial monitoring o f the new wells, f ollow ed by routine monitoring

o f the f ollowing

wells every 2 months:
• MW941102
• MW041101
• MW041102
• The three new wells inside the Pride Hangar Th e monitoring

scop e includ esanalysis o f VOCs, COD, sul f ate, and th e f ield paramet ers pH, conductivity,

and oxidation-redu ct ion pot ential (ORP). Also, field m easurem ent o f dissolv ed oxyg en (DO) will b e p erf orm ed onc e p er year, in th e spring,to provide additional in f ormation

on ground wat er redox conditions. Th e curr ent plan us es an off-sit e laborato ry f or all VOC, sul f at e, and COD analys es. Us e o f the on-site lab is recommended f or future VOC analysis at the Pride Hangar, as oil int e rferences are not exp ected. Sampleswill be evaluatedf or oil content and excessive

odor; i f th ese f a ct ors pose a probl em

f or.th e on-sit e lab, th e VOC analys eswill be pe rf orm ed at an off-s it e lab. Th e curr e nt vinyl c h lorid em e

thod det ect ion limit

f or th e on-sit e lab will b e evaluat ed in F ebrua ry 2005 in an effortto increase the sensitivi ty , given th e 2 ug/

L drinkingwater standard. However, a slightly high er det ection limit f or vinyl chlorid e is not a major conc ern becaus e the Prid e Hangar treatment area is distant from the installation bounda ry . Also, the on-site lab will send approximately

10 percent o f the samples to an off-sitelab f or comparison.



# 2 30 005

# EarthTech A Tyco International ltd. Company 

### Mr. Mark Ma ilander U.S. Army Corps o f Engine ers February 21,2 0 05 Pag e 6 In addition

to the abov e, th e f ollowing additional

monitoring

is r ecomm ended:
• Dissolved gas analysis is recommend ed at MW041101 and MW04110 2 every 4 months. Dissolvedgas analysis at th e other site monitoring w e lls will be perf ormed annually in the spring. This analysis includesethane, ethene, methane, and acetylene. The ac e

tylen e results may be help f ul in determining th e role o f biogeoch emical reduction. This is a specialtyanalysisthat can be pe rf o rmed by Micros eepsor other quali f i ed specialty

lab.
• One to two events o f biological analysisare recommend edto track potential increases in d ehalococcoid es

populations

at MW041101 and MW041102. CENCUS analysis b y MicrobialInsights

is r ec ommended.
• All sit e monitoring w e lls will b e sampled f or chloride analysis tw o tim es pe r y ear. Th e chlorideresultsmay help to determine the f ate o f chloride

from the r ed uction

o f TCE. The abov e analysis is expect ed to provid esufficientin f ormation to e valuate biod ec hlorination progress. Reliable f ield measurementso f pH, ORP, DO, and conductivity will be sufficient

to def in e the r ed ucingconditions n eed ed . Th e f ollowing proc edur e is r ecomm ended

to obtain th e most reliableORP m easur ements.
• Purg e a nd sampl e w e ll using a submersibl e pump or p eristaltic

pump with ch eck valve. A bailer may be needed at some of the wells due limitations o f d epth or well diamet er.
• Us e a flow-through c e ll or a batch-f ill ed,

s eal ed c e ll with subm erg edORP sensor. The cell shouldbe mix ed using a portable magneticstirrer unless sufficient f low is available f or mixing. 2,0 SCOPE AND PROPO SED MO N ITORING - IN-SlTU SVE TREATME N T This section pr esents a summary o f the SVE work p e rf ormed and recommendations f or co ntinu edop eration

and monitoring

o f the SVE syst em. 2.1 SVE Pilot :

Test SVE pilot testing was perf orm ed in the TCE source area o f the Pride Hangar site during May 2004. Th e purpos e o f th e SVE t esting was to d e t ermin e i f signi f i ca nt

solv ent vapor (mass) existswithin the vadose zone, warrantinginstallation and operation of an SVE system. Results o f th e SVE t esting ar e includ ed in a m emo (Prid e Hangar SVE T esting and Recomm e ndation) prepared by Earth Tech, dated May 24, 2004. 

# 2 3 0 006

# EarthTech A Ty

_oIn t

ernatieeal Ltd. Company 

### Mr. Mark Ma ilander U.S. Army Corps o f Engine ers February 21, 2005 Page 7 SVE pilottesting was perform ed at t emporary

wells SVE1101, SVE1102, and SVE1103 and at e xisting well MW041 1 0 1 (se e Figur e 2). Th e r esults

are summariz ed

below:
• Unsaturated soil has a low permeability to vapor f low as evidenc ed by the lack o f m easurable vacuum obs erved during t esting at nearby wells and th e relativ e ly low extraction

f low rates.
• Testing at SVE1101 and SVEl103 indicat ethat a low concentration o f organic vapors exists up-gradient and approximately 40 feet down-gradient o f the f ormer UST excavation

ar ea.
• Testing at SVE1102 and MW041101 indi catethat signi f icant vapor concentrations

exist within the f ormer UST ex cavation area with sustained vapor concentrations above 100 parts p er million

(ppm) . Bas ed on SVE pilot test results, a tempora ry SVE system was set up and operated to address TCE impact ed

vadose zon e soils at the Pride Hangar site. 2.2 SVE System Construction A tempora ry SVE system was co nstruct ed to remediate

TCE contamination

in the vadose zon e. The system included

the installation

o f f ive additionalSVE wells (SVE1104 through SVE1108). Each w e ll was construct ed o f 2-inch diam e

ter PVC with a 10 - foot screen placed above the wat er surf ace and a hydrat ed b entonit e s eal abov e th e scre en. W e ll locations ar e shown on Figur es

2 and 6. The SVE system utilized six o f the eight SVE wells, including SVE110 2 and SVE1104 through SVE1108. Wells SVE1101 and SVE1103 w ere not used b ecause o f relativ e lylow organic vapor analyz er (OVA) m easur em ents obs e rved during SVE pilott esting. Th e six w e lls w er e conn ect ed to an electri ca lly-power ed 5-hors epower

vacuum pump (blower) via at-grade PVC piping. Soil vapor ext racted f rom th e subsurf ac eis v ent ed dir ectlyto the atmospher e through a discharg e stack which ext ends above the Pride Hangar. 2.3 SVE System Monitoring Results The SVE system was plac ed into operation on July 1 , 2004, and has operated on and off as follows:
• The system was initially operat ed continuously during July 1, 2004, through July22, 2004.
• The syst em was then op erated f or a 24-hour period once per w eek to r ed uce energy consumption and to minimiz e possibl e adv ers e effects on th e ana erobic bio-dechlorination

pr ocess f rom prolonged subsu rf ace aeration. The system was operat ed in this mann er f rom July28 through

November

4, 2004. 

# 007

# EarthTech A T

_ eco Int ernational

Ltd. Company 

### Mr. Mark Ma ilander U.S.Army

Corps of Engineers February 21,2005 Page 8
• The system w a s operated continuously during the week of November 8, 2004, to determine if the rate of TCE removal is high enough for long periods of operation.
• The SVE system has not operated since November 15, 2004. System monitoring included observing and recording system vacuum pressures and collecting vapor samples from individual SVE wells and the system effluent. Vapor samples were collected in Tedla r bags and field scr eened for VOCs using an OVA. System monitoring data is included in Table 4. During the monitoring peri od , vacuum pressures ranged at the blower and the individual wells are fairly co nsistent at 60 inches of water. OVA readings on vapor samples co llect ed from the SVE wells ranged from 9 parts per million (ppm) in SVE1105 (July 7, 2004) to 500 ppm in SVE1106 (July 28, 2004). OVA readings on vapor samples collect ed from the system discharge stack (effluent) ranged from 10 ppm (November 4, 2004) to 105 ppm (October 21, 2004) with lower concentrations the longer the system runs in a cycle. OVA readings on effluent vapor samples were generally less than samples c oll ect ed from individual SVE wells because =m ake -up" air (fresh air) was requir ed by th e blower due to high vacuum pressures, i.e., the vapor stream was dilut ed . OVA results over the week of continuous operation show a low but steady removal. The TCE mass removal rates for the initial operation was estimated at 2.4 Ibs/ day for a total of 83 Ibs removed through November 4, 2004. TCE removal over the week - long test in November is estimated at 0.8 Ibs/ day and the total removal to date is approximately 99 Ibs. 2.4 Recommended System Operation The latest week - long operation event showed a low but steady removal of TCE indicating that continued SVE operation is warranted. However, due to the potential aeration of ground water and its detrimental effect on the anaerobic ground water treatment project, it is recommended that the SVE system is not re -sta rt ed until fu rt her ground water treatment progress is made . The SVE operation may be delay ed until the spring of 2006 and will be evaluated in future status reports .



# 2, 30

# EarthTech ATyco Int ernational Ltd. Company Mr. Mark Ma ilander U.S. Army Corps o f Engine ers

February

2 1, 2005 Pag e 9 

### 2.5 Ambient Monitoring The f ollowing air sampl es hav e been coll ected from within th e Prid e Hangar to d e t ermine whetheroperation

o f the SVE system is impacting air quality

withinthe Prid e Hangar:
• Two samples in June 2004 bef or e operation o f the SVE system to establish baseline lev e ls in the Pride Hangar.
• Two sampl es on Octob er6, 2004, after th e SVE syst em was operatedf or approximat e ly 20 hours.
• Two sampl es on Nov emb er 15, 2004, aft er th e SVE was op erat ed f or 17 days. Each sampl e was coll ect ed ov er an 8-hour period using a SUMMA ®canister and analyz ed f or VOCs. A complet e

s e t o f analyti ca l results

f or th e Jun e and Octob ersampl es was provid ed with Serial Letter Nos. 1-54 - RA-408 and ERS-3-RA-144, respectively. The anal yt ical results f or the Nov ember

2004 samples ar e attached. Anal yt ical results are provided on Table 5. The rang e o f TCE concentrations f or each o f these ev ents is as f ollows: TCE Concentration, Even...__tt parts per billion by volume (ppbv) Prior to SVE Operation <0.0075 Aft er op eration

f or 20 hours 0.14-2.5 Aft er op eration

f or 17 days 0.053-0.062 Whil e th e data is limit ed , it do es sugg estthat op eration o f th e SVE syst em results in incr eas ed TCE air conc entrations withinth e Prid e Hangar. VOC concentrations appear to be high er wh e n the system is initially

started with d ec reased concentrations as the system operates for a longer periodo f time. This is consistent with higher concentrations in the SVE system discharge during the initial periodo f an operating cycle. Bas ed on th es e r esults, a ca rbon tr eatm ent unit is b e ing add ed to the SVE syst em efflu e nt discha l :g e

to r educ e emissions o f VOCs. Additional sampling within the Pride Hangar is recommended

to determine whether the treated SVE vapor discharge has any impact on air quali ty in the building .


# 2 30 009

# EarthTech A Tyco International Ltd. Company 

### Mr . Mark MaU ander U.S. Army Corps of Engineers February 21,2005 Page 10 Recommended

samples are as follows: Time Sample Description Rationale Prior to SVE One sa mple within the Pride Provideadditional background Operation

a Hangar. information withinthe Pride Hangar. One ambient

air sample Determine concentr ations

in ambient upwind of the SVE system, air, unaffect ed b y the SVE system. Begin sampling Two samples (east and west Results obtain ed withinthe withinthe first sides) withinthe Pride Hangar in Octoberand 24 hours Pride Hangar. November 2004 show ed higher following TCE air co ncentrations were observed startupof the when the SVE system is initially turned SVE system on. This resu lt would be us ed if the SVE system

were operated in a = pulse " m ode and provi des

the worst -case scenario. On e ambientair sample Determine concentrations

in ambient upwind of the SVE s ystem, air, unaffect edb y the SVE system. After operation Two samples (east a n d AssessTCE concentrations with of the SVE west sides) within the continuous operation

of the system for Pride Hangar. SVE system. 14 consecutive One ambientair sample Determine concentrations

in ambient days upwind of the SVE s yste m , air, unaffect edb y the SVE s ystem. a The SVE system has not been in operation since November 15, 2004. Ai r quality standards for the Pride Hangar have not been established. Table 5 includes occup ational

standards

for workers, as defined in the Air Force Occupational Safety and Health (AFOSH) Standard 48 -8, Target Indoor A ir Concentrations for residential use, and the USEPA Region III risk based concentrations (RBCs) for ambientair. None is dir ectly applicable sincethe primary

use for the Pride Hangar is recreational exercise and the exposure

times would be different

from the exposure

times used to develop the standards list ed . Analyti ca l results for the recommend edsamples will be reviewed and, if necessa ry , site -specific target ind oo r air concentrations_

may be calculated using co nservative exposure scenarios for the recreational users. 2 .6 Sample Proc ed ures The vapor samples will b e coll ect ed using SUMMA ® canisters as d escribed in Serial L e tt er No. 1-43-RA-386, dat ed July 22, 2002. Each sample will be a co mposite sample co ll ect ed f or a peri od o f 8 hours. Vapor sa mpl es will be an a lyz ed by Pace Anal yt ical (Pace), Minn eapolis, Minn esota, using M e thod TO-15 SIM f or th e VOCs list edon Tabl e 6. Reportinglimits ar e includ ed

on Tabl e 6 but th ese ca n va ry depending on the actual sample volume collect ed and with dilutions. 

# 2 30 o1 0

# EarthTech ATyco I

_ational Ltd. Company Mr. Mark Ma ilander UoS.Army Corps of Engineers

February

21,2005 Page 11 

### Air sample results can be reported in units of ppbv or micrograms per cubic meter (ug/ m 3 ). Units of ug/ m ° require a conversion by the laboratory

and results

will be report ed in ppbv. Both sets of units are included

on Table 6 since air samples have been repo rted in units of ug/ m 3 in previous submittals. 3.0 PRIDE HANGAR SOUR CE TREATMENT STUDY TIMING AN D REPORTING A period of 12 months is considered necessa ry to evaluate the d ec hlorination ground water treatment approach at the Pride Hangar Site. The study results will be summarized in the qua rt erly OU - 11 LTM repo rt s and in status repo rt s to be submitt ed in June and December of 2005. Additional

status may be repo rted in t ec hni ca l memoranda as n ecessary. Completion

of the soil borings

a nd installation

of the four injection

and three monitoring

wells will be sch ed uled

when the work plan is approv edand the injection is approv ed by EPA. Sincerely

_ Keith J. , _ lderson, P.E. Proj ect M'anag er Enclosur es f ile: 74311 /

01.1 503 Tim Pav e k John DeYo e Jim Haggins Joane Lin eburg J e ff Mashburn Bob Todd_ D

_ N ight Pochant Deb Morriss e

y Joe Odegaard Gr eg Brooks Cathy Larson L 5 W O Rk '

3. ER S\74 31 I \

w r_SER IAL LETT ERS

_ . . E :.. R S* 3 - RA- 158 DOC 

# 23 0 0 11TABLE 1

MW941102 MONITORING RESULTS PRIDE HANGAR BIO - DECHLORINATION STUDY ELLSWORTH AFB Pre - lnject Field Measurements Units 1 / 29/ 04 3/

9 1 04 4/

5 1 04 5/

5 1 04 6/

7 1 04 7 1 8/

04 8/

4/04 9 1 2/

04 10/

4/ 04 11 1 3/04 1 2/ 10 1 04 1 1 6 1 05 

### pH 6.84 6.95 7.21 7.17 6 . 7 5 7.32 7.8 7.18 6.96 7 . 03 7 . 03 8 .11 Conductivity uS 1418 1 1511 1492 1486 1059 1437 1479 1508 1527 1527 1531 1 3 89 DO m_

/ L < 0.5 < 0 . 5 i ORP mV -8 -30 -519 -70 -57 0 -26 -90 - 179 -62 -2 3 - 15 Lab Analyses ' TCE ug/

L 230 25 0 220 290 300 324 239 208 3 0 0 222 282. 5 2 0 9 cis - l,2 - DCE u

_ / L 7.3 8.4 7 . 3 6 . 4 6.3 < 10 6 . 6 7.2 11 6.9 10.2 8.2 tr a ns - l,2 - DCE ug/ l

_ < 10 < 10 < 10 < 10 < 10 < 10 < 0.5 <5 <5 <5 <5 <5 Vin y l Chloride u

_ / L <20 <2 0 <20 <20 <20 <30 < 0 . 6 < 6 < 6 < 6 < 6 < 8 DCE fT CE 0.03 0.03 0.03 0 . 02 0.02 0 . 00 0.03 0 . 0 3 0.04 0.03 0.04 0.04 Et h a n e n_

/ L Ethene n

_

/ L Methane n

_

/ L COD m g/

L 9.9 3.6 6.9 <2 0 <20 2.3 < 1 5.6 < 1 2 1.6 5 . 8 Sulfate m

_

/ L 360 394 372 372 417 407 495 404 378 420 395 Observ ations Color clear cle a r clear Clear Clear Clear Cle a r Clear Clear Clear Clear Free O il L ayer None None None None None None None None None None Non e Odor No No No No No No No No No No No Notes: ND - Not detected

NR - Not reported

L: l W orl d E RS I 7431 l

_ 03 1 T ech I Pride H

angar Source Tr

eatm en tI Dechlor-results- PHI MW 941 102 2

_ 3 0 0 1 2TABLE 2

MW041101 MONITORING RESULTS PRIDE HANGAR BIO - DECHLORINATION STUDY ELL S WORTH AFB Pre - lnJect Fi e ld Measurement s Units 1 / 29 1 ()4 3/

9/ 04 4/5/04 5/5/ 04 6/

7/ 04 7/

8/ 04 8/

4/ 04 9/

2/ 04 10/

4/04 11 /

3/ 04 12/ 10/ 04 1 / 6/ 05 pH Conductivity uS DO mg/

L ORP rnV L a b Analy s es TCE : u

_ L 16 000 1 6 00 0 4 1 O 0 11 00 3 000 8 97 1 150 7 34 1 2 0 5 8 53 137 0 10 1 8 cis - 1,2 - D CE u

_

/ L < 100 <100 <100 < 100 < 100 <5 1 8 .4 2 0 156 . 5 112 90 1 22 trans - 1,2 - DCE ug/ L < 100 < 100 < 100 < 100 < 100 <5 <5 <25 <25 <2 5 <2 5 <25 Vinyl Ch l oride ug/ L <2 00 <1000 <2 00 <200 <2 00 <30 < 6 <30 <30 <30 <30 <30 DCE/ TCE 0.02 0.03 0.13 0.13 0.07 0.12 Ethane ng/

L Ethene ng/

L Methane ng/

L CO D rn g/

L 9 70 1 300 0 0 7 8 0 0 0 17 00 0 1 3 000 1 0900 10500 8 90 0 94 2 0 940 0 74 20 72 80 Sulf a t e m_

/ L 4 3 0 290 220 76 160 138 87.9 82.8 82.3 65 49 . 4 35 . 7 DHC C e l V

mL 3.2 O bs e rv ations Milky / Cloudy / Milky Milky Milky Milky Milky Milky Cl ea r , Color whit e whit e Whit e Whit e Whit e Whit e Whit e Whit e Whit e Free Oil L aye r Non e Non e Non e Non e Non e Non e Non e Non e Non e Odor No Yes Yes Yes Yes Yes Yes Yes Notes: ND - Not det e ct e d NR - Not re ported DHC - D e h a loco c coides ethenog e nesTABLE 3 ,

MW041102 MONITORING RESULTS PRIDE HANGAR BIO-DECHLORINATION STUDY ELLSWORTH AFB Pre-lnJect Pre-lnject Reld Measurements Unlts 1 / 6/ 04 1 /

29/ 04 3/ 9/ 04 4/

5/ 04 5/

5/ 04 6/

7/ 04 7/ 8/ 04 8/

4/ 04! 9/

2/ 04 10/ 4/ 04 11 /

3/ 04 12/

10/ 04 1 / ,6/ 05 pH 7.12 7.1 8.96 7.12 7.24 7.09 7.3 8.96 7.09 8. 9 4 7.07 7.2 5 7.37 Condu c tivity u S 1640 2377 2796 3511 3466 3562 3218 3165 32 25 3436 2700 3608 3413 DO rng/

L

_ ' ORP mV 514 -534 -31 -55 - 143 - 161 - 132 - 152 - 140 - 2 4 2 - 136 - 1 43 -91 Lab A nal ys ea T CE u

_

/ L 1 9000 15000 12000 7 4 00 11000 28 1 60 26300 22150 27270 14910 7410 1270 cis - l

_2 - DCE u

_ L <50 <200 <500 <500 <500 <200 111 <400 710 8 03 2480 1201 trans - 1,2 - DCE u

_ / L <50 <2 00 <500 <500 <500 <200 <5 <500 <500 <500 <500 <50 Vin y l Chloride ug/ L < 100 <400 < 1000 < 1000 < 1000 • < 600 < 6 <600 < 50 0 < 600 < 600 < 50 DCF J' I -CE 0 . 00 0.03 0.04 0 . 33 0.95 E t hane n

_ / L Ethen e ng/

L Met han e n

_ / L CO D mg/

L 14 <20 18 19 26 39 . 7 4 2 .4 32 . 2 28.5 40 3 . 6 2.1 Sulf at e rr

_

/ L 10 43 1529 20 20 2045 2000 1500 1 56 0 154 0 1730 1 450 20 4 0 2350 DHC Cell /

mL 11.5 Observations Cloudy, C l ear, C lea r, C lea r, C l ear, C l ear, C l ear, C lea r, C lea r, Col o r Clear Clear Gr ey

_ rey

_ rey

_ rey

_ rey

_ lre

_ / grey gr ey gr ey C lea r Free Oil Layer None N on e N on e N on e N on e N on e N on e N one N one Non e Non e N(

_ ne Odor No No No No No No Yes No No Slight Y es Y ea Notes: ND - Not detected NR - N o t report ed DH C - D eh alo c o co ol d es et henogenes

. L:

_ W_r_ d .TERC

_ 74311 -_3l Tech l Pride

H a ng a r S_urce Trea tment

_ Dech

_ r -resu_s - PH V V iW_411_2 2 L

_ 3 0 0 14TABLE 4 SVE OPERATIONAL

MONITOR I NG

RESULTS Pride Hang a r

SVE System Ellsworth

Alr Force Base Dat e Blower Di ff , R o w Dis c h, Rnal SVE11 04 SVE11 0 5 SVEl1 0 6 SVE1102 SVE 1 1 0 7 SV E 1 1 08

Vacuum Pres s, Temp. E ff luen t h2o/ pp m h2o/

pp m h2o/

ppm h2o/

ppm h2o/

pp m h2o/

ppm i n h2o in h 2 o ' d

m Dec

j F ppm VAC OVA VI C OVA VI C OVA VI C OVA VAC O VA VAC OVA 7/ 1 / 2004 62 2 72,9 325 62 * 70 * 62 * 60 225 5 0 * 58 45 7/ 1 1 2004 3 5 * 90 400 2 2 5 65 38 7/2/ 2004 60 2 73 , 1 154 24 60 * 68 60 60 78 58 100 48 80 58 60 7/ 6/ 20 04 61 2 73,0 15 61 * 61 21 61 16 60 48 48 60 58 37 7/ 7/ 20 04 60 2 73 , 1 18 60 35 60 9 60 40 60 30 48 13 57 20 7/ 12/ 2004 61 2 73,0 14 61 45 61 40 61 6 0 60 120 48 36 58 20 7/22/ 2004 61 1 , 9 71 , 2 18 60 115 58 55 59 114 58 115 45 46 55 45 7/ 28/ 20 04 60 2,1 74 , 9 30 42 * 59 * 60 500 59 165 48 95 57 30 7/29/ 2004 60 2,1 74 , 9 22 60 130 58 40 59 250 58 130 47 50 57 22 8/6/2004 60 1,9 71 , 3 20 60 105 60 55 61 250 59 106 48 60 58 30 8/ 13/2004 59 2,4 80 , 2 15 59 68 58 55 60 100 58 95 46 60 56 35 8/ 19/ 2004 60 2,2 76 , 7 25 60 * 58 * 59 * 58 250 48 * 57 * 8/ 20/20 04 59 2,4 80,2 23 60 * 59 62 60 200 58 125 47 75 57 46 8/ 26/2004 60 2,2 76 , 7 125 59 * 58 * 58 * 57 260 47 * 56 * 8/27/2004 60 2 , 5 81,8 20 59 100 58 70 59 205 57 55 47 105 55 38 9/ 2/2004 59 2,1 7 5 , 0 20 60 * 58 100 60 300 58 55 49 20 57 9 0 9/3/2004 59 2,3 78 , 5 23 59 105 58 85 59 175 57 150 48 75 55 55 9/ 9/ 200 4 60 2 73 , 1 60 61 * 61 * 63 * 60 100 50 * 58 150 9/ 10/ 2004 60 2 73 , 1 30 60 * 60 85 61 40 0 59 150 49 75 58 70 9/ 16/2004 59 2,3 78 , 5 56 58 * 57 * 60 * 58 250 47 * 56 * 9/ 17/2004 59 2 , 3 78,5 17 58 65 58 75 59 225 58 120 47 70 56 65 9/23/ 20 04 60 2,2 76,7 45 59 * 57 * 0 600 58 120 48 275 56 90 9/24/2004 60 2.2 76,7 30 60 * 59 130 60 310 59 120 48 90 57 90 9/30/ 2004 60 2,1 74,9 60 60 * 59 * 60 * 58 125 48 260 56 175 10/ 1 /2004 60 2 , 4 80,1 24 60 130 60 125 61 225 57 90 49 80 58 80 10/5/ 2004 60 2,1 74,9 60 60 * 59 450 60 * 58 85 48 60 57 100 10/6/2004 60 2 , 1 74.9 26 60 65 59 80 60 100 58 55 48 7 5 57 65 10/ 14/ 2004 60 2 73,1 80 60 * 58 * 60 * 58 210 48 350 57 200 10/ 15/2004 60 2,4 80 , 1 30 59 * 58 130 59 500 57 100 47 125 56 100 10/ 21/2004 59 2,2 76,8 105 59 400 58 * 55 550 58 70 47 330 56 210 10/22/2004 60 2,2 76 , 7 30 59 160 58 250 60 300 58 110 48 95 56 100 11 / 4/2004 60 2 , 4 80 , 1 10 60 120 5 8 150 61 90 58 40 48 N / S 57 10 11 / 8/2004 60 2,7 85,0 18 58 180 57 120 59 225 57 75 47 50 . 56 36 11 / 9/2004 60 2,7 85.0 22 58 200 57 150 59 250 5 7 70 47 45 56 37 11 / 12/ 2004 60 2 . 6 83,4 20 59 200 58 141 59 250 57 50 47 35 56 33 Operating Note s : Blower shut down 7-2 3-04, operated approx 24 hours 7/ 28 -7/ 29 , 8/ 5 -8/ 6, 8/ 12-8/ 13 , 8/

19 -8/ 20, 8/ 26 -8/ 27, 9/ 2 -9/ 3, 9

_ -9/

10 , 9/

16 -9/ 17 , 9/ 23 -9-24, 9/

30-I0/ 1,10/ 5 - 10/ 6, 10/

14 - 10/ 15, 10/

21- 10/ 22, 10/ 29 - 11 / 15 (problem with FID 11 / 2)

- - Sample extinguished

flame onOVA

I " \ Work

_ ERS

_74311 \

Tech

_ Prlde Hang a r Source Treatment

_SVE RA L PH SVE 2 l_J L 3 0 015TABLE 5 SUMMARY OF DETECTED RESULTS IN AIR SAMPLES Evaluation of the Pride Hangar SVE System - Event #3 ' Ellaworth Ai r For c e Base, South Dakota EPA Pre-SVE Oper ation Durin g SVE Operation OSHA ACGIH AFOSH T arget Indoor Air Region III Pride H a ng a r E Pride Hangar W Pride H a ng ar E Pride.H a ng a r E Pride Ha nga r W P ride Ha ngar W Trip Blank Anal

_e Units PEL TLV I Sta n dard Concentration" RBC c 6/ 2/ 2004 6/

'2/ 2004 10/

6/ 2004 11 /

15/ 2004 10/

6/ 2004 11 /

15/ 2004 3/

15/ 2004 _a rbon T e

trachlodde ppbv 10,000 5 , 000 5

_000 0.026 0.019 < 0.0077 < 0.0077 0.1 0.1 0.11 0 . 055 < 0.066 Chloroform pp b v 50,000 = 10

_000 10,000 0.022 0.016 < 0 . 0077 < 0.0077 < 0.0077 < 0.026 < 0.012 < 0.030 < 0.066 C hl oromet he ne ppbv 100 , 000 60 r000 50

_000 1.2 4 . 6 0.034 < 0 . 0077 < 0.0077 0.37 0.13 0.43 0.16 1,1-Dichloroethane ppbv 100,000 100,000 100 , 000 120 12 . 6 < 0.016 < 0.016 <0.016 < 0.055 < 0 . 025 < 0.063 < 0 . 14 1

_ . - Dlchloroethane ppbv 50 , 000 10rooo 10

_000 0.023 0.017 < 0 . 0077 < 0.026 < 0.012 < 0 . 030 1,1 - Dlchloroethene ppbv none 5,000 5,000 50 5.6 < 0.0077 < 0.0077 < 0 . 0077 < 0.026 < 0.012 < 0.030 < 0.066 cis - 1

_2-Dtchloroethe na ppbv 200,000 200

_000 200,000 8.8 0.935 < 0.0077 < 0.007 7 0.026 < 0.026 0.47 < 0.030 < 0.066 bamp 1

_2 - Dk:htoroethene p

_ 200,000 200,000 200,000 18 1.8 <0.0077 <0.0077 <0 . 0077 <0.0 26 <0.012 <0.030 <0.066 Meth

_ kme Chk)d da ppbv 26,000 50

_000 26,000 1.6 1.1 0 . 26 0.12 6 0 . 09 1,1,2r2 - Tetrachlor ne thane ppbv 6

_000 l r000 1,000 0.0061 0.005 < 0 . 0077 <0.0077 <0.0077 <0 . 026 <0.012 <0.030 <0.066 Tetraddoroethene ppbv 100,000 26r000 25,000 0.12 0 . 046 < 0.0077 < 0.0077 < 0.0077 0 . 048 0.2 < 0.030 < 0.066 1 ,l

_ l-Trlcldoroetha ne ppbv 350,000 350

_000 350,000 400 42.2 < 0 . 0076 < 0.0075 < 0.0076 < 0.0 26 < 0 :012 < 0.029 < 0 . 064 1 ,lr2 - Tdchloroethane ppbv 10 , 000 10,000 10,000 0.028 0.020 < 0.0077 < 0.0077 < 0.0077 < 0.026 < 0.012 < 0.030 < 0.066 Trlc hl oroethe ne ppbv 100

_000 50,000 50,000 0 . 0041 0 . 003 < 0.0075 < 0.0076 0.14 0.053 2.5 0.062 < 0.064 Vinyl Chlodde pp b v 1,000 1,000 1,000 0.11 0 . 028 <0.0075 < 0.0076 < 0.0075 <0.026 <0 . 012 <0.029 < 0.064 ' and He al th Administration' s (OSHA) pe rm issible exposure limits (PELs). ACGIH TLV - Amedcan Co nference of Industrial Hygienists' (ACGIH) threshold limit value (TLV). AFOSH - Air Force Occupational Safety and Health (AFOSH) Standard 48 -8. • - Draft Guidance for Ev a luating the Vapor Intrusion to Indoor Air Pathway from Ground Water a nd Soils. Nov. 2002 . The values s ho wn are for a cancer risk level of 1E -6 and a hazard quotie nt of 1 for no n -canc er risk .

- E x po sure shall at no time exceed the e xpo s ure limit given. If instantaneous m on it oring i s not feasible, then t he ceiling s he ll be asse ss ed a s a 15-minute time weight ed average ex po s ure which she ll not be exceed ed at a ny time during the woddng d ay. o . RBC - Risk-bas ed c oncentration (U.S . EPA, October 8, 2004) . RBC s for no ncorci no gens divid ed by 10 to a ccountfor poten tial additive affects. RBC s convert ed fro m units of ug/ m 3 to ppbv ue l ng the eq uation: ((Val ue in ug/ m 3) Im ol e cular w al ght)*24.486.

- - Not analyzed

L: l Worl dTE RC1 7 4311

_ O3

t Tech t Prkle Hang

a t t Da ta . Pride HangarS VE event3 Rev

_ op bv 2/21/2005 

# 2, 130 OJ 6, D 

### TABLE 6 LIST OF VOCS FOR PRIDE HANGAR AIR STUDY EIIsworth Air Force Base, South Dakota Reporting Target Indoor EPA Reporting Target Indoor EPA J 

### Limit Air C oncentration Region III Limit Air Concentration Region III Analyte (ug/ m3) a (ug/

m3) b ( ug/

m3)c (PP bv) a (ppbv)b (ppbv)C Carbon tetrachloride , 0.0333 0.16 0.12 0.0052 0.026 0.019 Chloroform 0.0258 0.11 0.077 0.0052 0.022 0.016 Chloro m ethane 0.019 2.4 9.5 0.0052 1 . 2 4.6 1,1 - Dichloro e thane 0.045 3 500 51 0.011 120 12.6 1 i 1 - Dichloroethene 0.021 200 22 0.0052 50 5.6 cis - 1,2 - Dichloroethene 0.021 35 3.7 0.0052 8.8 0.935 trans - 1,2 - Dichloroethene 0.021 70 7.3 0.0052 18 1 . 8 1,1,2,2 - Tetrachloroethane 0.0363 0 . 042 0.031 0.0052 0.0061 0.005 Tetrachloroethene ( PCE) 0.0359 0.81 0.31 0.0052 0 . 12 0.046 1,1 t 1 - Trichloro e thane 0.0283 2200 230 0.0051 400 42.2 1,1,2 - Tri choro e thane 0 . 0288 0.15 0.11 0.0052 0.028 0.02 Trichloroethen e ( TCE) 0.0279 0.022 0.016 0.0051 0.0041 0.003 V i n y l C hl o r i d e 0 . 0133 0.2 8 0.0 7 2 0,00 51 0.1 1 0 .02 8 a . The reporting limit f or each sampl e and compound will vary bas ed on the amount o f th e time w e i ghted sample tak en an d i f th ere w a s a dilution p erf ormed on th e sample. b. Dra ft Guidance f or Evaluating th e Vapor Intrusion to Indoor Air Pathway f rom Ground Water and Soils. Novemb er 20 0 2. Low er value o f th e canc er risk at 1 E-6 or a hazard quoti ent o f 1 f or non-canc er risk. c. RBC - Risk-bas ed conc entration (U.S. EPA, Octob er 8, 2004). RBCs f or noncorcinog e ns divided by 10 to account f or potential additiv e e

ff ects. RBCs convert ed from units o f ug/ m3 to ppbv using th e equation: ((Value in ug/ m3)/ mol ecular w e ight)*24.486.

L: l Work l ERS I 7431

l

_ 03 1 Tech I Pnde

Hangar I Reporting

Limits Vapor

- Pr i de Hangar

SVE 2 i_ 3 0 0 1 ?DATE -Mon Feb 21 10:31:48 200 5 

## " '. " " ' ,. . .% .... : \ ',,

_ _r' 

# 1

. ,,." .. " :- " . ..,. ",- , - ,: .... _!,, //.. , ,

.. :'. _, , , ; ",.,_, . " . .,._:,_, . .% . .'. .. . ' , ,\ ". _'

_ , , ,._ / " , - ....... O " " , *" ...... " , 3"_-,7

;' "" "_" < _"*"_ ' , \" "--.

__._Y "'" / ,'" \ ".,."x, ....... •

_ , / "\. , ,,i " . ... "_,_., . " .,.. ,.... ,.. _., , _. , _ x, -' " ", ._ :
_ i • . " " ; ' " ". " I "

_ " , " ; " " "_,_ " J •

_ , , \ , \, ".... , _..: , ,.._,;._ , ," j' . , ,/: " .,_, • ...... ," • ,_ , , • .,. "_('_, . ," -\ . . _..

_. ,_. ! D :.. :C t , _ _ :

_ I " , : :

_ , , , Y" . ",, ., , , , "" \, ) /" /

/ / "' _"

_ " ' "_"x.

" 1% 3 " "-- . '

_ " I t , . Cl

_ I_O x_,, , * " - - . I /I ' " • 

# ,,, , ._:,, .. : , . "., : ..- , _% , ., PR I

DE HAN G AR
- , " "" '<" "% .,,, _ .., ) . , ' ' , ,.

" , , Z ; ' , , N , • . , . , ,, , _" <. "_ x . , 

## . . . _..., ,- . , > " , . , L EGEND
- .... '- --- " ....... , -* "_o-" ,, A

LTO/ LTM GR O U N D

WATER . . . - '_' '-b MON I TORING L O C AT ION •

_ . . ...... _ E XTR AC T

IO N WE LL ",,, . ... ",...
, _._. " • _. . , ,, _ " " -
_ . ",, . , 

## DCE I CHL O ROETHENE "_.. . _ , % -- -- - - ", "" - - TCE TR I CHLOROETHE N E 1 CONTOUR

L I NES BASED ON " PRIDE HANGAR EXTRA C

T I ON W ELL S SAMPLED OCTOBER

200 1 , SAMPLING LOCATIONS/ ORGANIC CONCENTRATIONS D I RECT PUSH LOCAT I ONS SAMPLED J ANUARYAND LTO/ LTM APRIL 2004 EVENT OU ' I ! APR I L 2002, A ND MON I TOR I NG W ELL S SAMPLED ELLSWORTHAFB, SOUTH DAKOTAD ATE - Mon Feb 21 10 : 31,44 2 0 05 DG N -\\ usminsOl \doto\

work \ terc\63842 54\codd \ PRIDE\aw_flow.d a n 1 FI I '

_ I I I II I III II / I I / III I[ I I I I I II II I IIII 

# , , ,, ,, ,, _ t oc= % " / J / • i / "\, 

### \. " ,, ,, '

_ , _ . _ ,- ," "- M W 94110 2 22.T : 3216.14 319 3 ,44

• \ , _3%

_ >'

0 ¢o

_ " ,- "_ • / / s 

### \" . ,,_ 4 - .......... , ,," ,-'" ,- " MW041101 2 , 2.9 3215. 81 3192. 91 \ , _,_.{ , _ , ._ ,, PA RKI NG , ",, . \_, , , ....

\ ,' " .....

. ,, ,' " 1

_0 4 1102 2 3 ,25 3 215.98 3 192.7 3 ,,_ .. , . ,-" -,. , '" / / \ s "\'N, ., . . ,• • / • ._ ",, _: 2 " . - "X , " • ' ,._- .p= 

# ",_ '/,

SVE 1 1 0 1-- .....

,, , 105

"" .. \, 1106 OI LAREA IN JECT I O N H Y DR AN T . DPO2PHOI(sEE N OTE1oT 1 ) PR ID E HAN G AR--

__ SV E110 4 S VE1 1 08 MW041 101 MW041102 3192.91 3192.73 S V E 1 1 02 UST E X C AVATI O N \ \ 

### " \ O ' 10' 20 ' _3./ "'"" , S CALE

\, . \ NO T E : / I_1I_tLII ILIIlk 

# SV E11 \. \ "- 1. 30 , 590 u g/

I TC E D E T E CTED IN EX I STING M ONI TOR IN G MW9 4t102 \, " .... GR O U N D WATER S A MPLE CO L L E CT ED

_ C

_ WE L L L OCA T I ON 3 19 3.44 ", \" FR OM DI R E CT PUSH S OI L B OR I NG ( 2002 ). (

_ FORME R DIR E C T P USH ' ' ' ' ' ' '"" "' ' ' S Ol L B OR I NG LOCATIO N 

# FIGURE 2 GW F LOW 3/

9/ 04 • SVE PILOT TEST WELL LOCAT IO N PRIDE H A NG A R SITE C) SVE W ELL LOCATI O NS ELL S WORTH A FB , SOUTH D A KOTA PREPARED FOR U . S . ARMY CORPS OF

_ ENGINEERS

_ I II I IIIII III I I I I IIII ¢ 

# 30 01 9

### Figure 3 MV ¢ 941102 Dechlorinization Results 600 5 0

5 00 - 5 0

400 -150 300 - 25 0
o

_ 2 00 - 35 0 M o I00 -45 0

g i 0 , -- 'r

_ ', " , _ t'

_ , , • r T , T , , T - 550 1 / 29 / 04 2 / 28 / 04 3/

29 / 04 4 / 28 / 04 5 / 28 / 04 6 / 27 / 04 7 / 27 / 04 8 / 2 6 / 04 9 / 2 5 / 04 10 / 2 5 / 04 11 / 24 / 04 12 / 24 / 04 Date , mm

/ dd / yy [ '- O '-TCE "I - c is.I, 2 -DCE • - VinylChlorid ¢ - i t-SO 4 --
_ -- O RP] 

# 2 3 0 0 20

### Figure 4 MW04110 1 D e chlorinization Results 1 8 000 5 00 1 60 0 0 450 400 14000 35 0 ! 12000

_ 

# 3 oo
•
_ 1 0000 i 2 5 0 o 80 0 0

_ 20 0 

# 6 o0o 1 5 0 _" 4000 100 20 00 5 0
0 ._ -N . - _ m - t

_ i . Hi - - _ , 'r m ._t,-- v

_ l _" 't

_ ' i

_ 0 1 / 29 1 04 2

/ 28 1 04 3 1 29

/ 04 4 / 28 / 04 5 / 28 / 04 6 / 27 / 04 7 / 27 / 04 8 / 2 6 / 04 9 / 2 5 / 04 1 0 / 2 5 1 04 11

/ 24 1 04 12

/ 24 / 04 Date , mm

/ dd / yy I -'*--T C E - "ll- eis-l , 2-DCE -* - Vinyl Chlorid e - I g--SO 4 1 

# 24 30 0 21Figure 5 MW041102 Dechlorinization Results 30000 2900 2400 2 5 000 1 900

_

_ 20000 _, " 1 400 

## 900 

# oooo

5 000 M- -I00

_ 0 , , -600 1 1 6 1 04 2

/ 5 / 04 3 1 6 1 04 4 1 5 1 04 5 1 5 1 04 6 / 4 / 04 7 1 4 1 04 8

/ 3/ 04 9 / 2 / 04 10 / 2 / 04 11 1 1

/ 04 1 2/ 1

/ 04 12 / 3 1 1 04 Date , mm

/ dd / yy 

# I-'-TCE

" - I -cis-I,2-DCE

_ORP

_ Vinyl Chlorid e -')

_ Sulfate [ 

# 2{ 30 0 22DAT E - Mon F eb 21 10:31:36 2005



### MW 04 1 10 1 141102 S VE 1102 ....

" % -.._. 

### LEGEND . " , , "\

_ p . " ,, . ,, , O' 10' 20'

_) EXISTING M O N I TORING ",,, W ELL LOCAT ! ON SVE

_ , 1 03 ,. , \ S C A LE (

_ FORMER DI RECT PUSH \ " S 0 1L B O RING L O CAT IO N " "" SVE P I LOT TEST W ELL L O CAT I ON (

_) MW9 41 1 02 .... . , . , , " \

" \ . _ . . _ o. " % 

### C) SVE W EL L L O CATI ON S ". , A .,, , '_ , " ,, ,, ................ FIGURE 6 PROP O SED GR O U N D WATER INJECT I O N W EL L PROPO S ED GROU N DWATER INJECTIO N PROP O SE D MO N I T O RI N 6 W ELL AND MONITORI N G L OCATIO N S PRIDE HANGAR SITE ELLSWORTH AFB, SOUTH DAKOTA PREPARED FOR

__ U . S . ARMY

_ CORPS OF

_ _ ENGINEER S 

# 2, '.30 0231700 Elm $tree L Suit e 200 Mi

_ , MN 55414 Phone:(612) 6

07-1700 Fax: 607-6444 

### December 0 2, 2004
Ms. Cathy Larson Earth Tech 3033 Campus Drive N Plymouth, MN 55441
RE: Project: 103214 Project ID: EAFB ERS 74311.01.1504 Dear Ms. Larson: Enclosed are th e analytical results f or sample(s) receiv ed by th e laboratory on Nov ember 1 6, 2004. Results reported herein con f orm to the most current NE LAC standards, where applicabl e, unless oth erwise narrat ed in th e body o f th e report. If you have any questions concerning this report, please feel f ree to cont act me . Sincerely, Daryl Peterson Daryl.Peterson@pacelabs . co m
IHinois Certi fi catio n #: 200011 Minnesota Certificatio n #: 027 -053 - 137 W ' sco n si n C

er Ufi calJon #: 9999407970 Enclosures

- T

• Page I o1 " 10 

### REPORT

OF I. A BORATORY

ANALYSIS Tlds mlx

_ = d w ll

no( be

_ mduced , except In ful, vdtho u t he

_ ltl m n cocse

_ (: 4

Pace Analytical

Se

_ c es. Inc . 

# 2, 13 0 0 2 4

# "

_ eAnalytical, "_" *' _""'_"®_" * "", -- '_ f Www . _ s. com MInn

_ , MN 5541 4 Phone:(612)607-1700 Fax: (612)607-6444 S AM PLE SUMMARY Project: 103214 Project ID: E A FB ER $ 74311.01.1 5 04 La b ID Sample ID Matrix Date Col l ec t ed Dat e Receiv ed 103214001 S36-PRIDEHANGAR-W A ir 11 / 15/ 04 15:05 11 /

16/ 04 09:30 103214002 135-PRIDEHANGAR-tE A ir 11 / 15/ 04 1 5: 05 11 1 16/

04 09 : 30

Pa g e 2 of 10 REPORT OF LABORATORY ANALYSIS This mpod

_ ml l ,or be

_ , e xcept in fu ll , w il hout t he wd ll mn

conse

_ o f I=

_e/

_ naly U cM Services,

Inc . 

# 2

/ ' , 30 0 25

# "

_ eAnalyti

cal ° e Pace / _JudytJ cal Ser v

ices, Inc. 1700 Elm Stree

_ Sure 200 ww w . pac e/ a bs ; c o m Minneapolis, MN 55414 Phone: (612)607 - 1700 Fax : (612)607-6444 SAMPLE ANALYTE COUNT Project: 103214 Project IO: EAFB ERS 74311 . 01 . 1504

_a

_tes Lab ID Sample ID Method Reported 103214001 636 - PRIDEHANGAR-W TO-15 by SIM 15 103214002 135.PRIDEHANGAR-E TO-15 by SIM 15

- 7

Page 3of 10

REPORT OF LABORATORY ANALYSIS Thls mpofl s h sl no

/ be reproduced,exce

_ In

_I,

_U

_ut lh e wn

_en consent of Psce Analy

_c

_ Servkm, Inc. 

# __:_ 2 4 3 0 0 2 6_ n

_ l l /

_ // . _ / 1 7 00 Elm Street S . 200

_ , MN 55414 f ww w.

_ bs. com Phone:(612)607-1700 Fax. (612)607-6444 

### ANALYTICAL RESULTS Project: 103214 Project ID: EAFB ERS 74311.01.1504 Solid results are repotted on a dry weight basis . Lab ID: 103214001 Date Colle c ted : 11 1 15/

04 15:05 Matdx : Air Sample IO: 636.PRIDEHANGAR-W Date Received: 11 / 16/ 04 09 : 30 Parameters Results Units Report

_ DF Prepared By Analyzed By CAS No. Qual R ag Lmt A ir TO15 MSV AIR SIM Analytical Method: TO - 15 by SIM Carbon telrachlodde 0. 055 ppbv 0. 0 30 5 . 73 11 / 30/ 04 22:59 MTG 56 -23 -5 Chlorofomt ND ppbv 0 . 030 5.73 11 / 30/ 0422:59 MTG 67 -66 -3 Chloromethane 0.43 ppbv 0 . 030 5 . 73 11 / 30/ 04 22:59 MTG 74 -87 -3 1,1-Dichloroethane ND ppbv 0.063 5 . 73 11 / 30/ 04 22:59 MTG 75 -34 -3 1,2 - Dichloroelhane ND ppbv 0.030 5 . 73 11 / 30/ 04 22:59 MTG 107 -06 -2 1,1 - Dichkxoethene ND ppbv 0.030 5.73 11 / 30/ 04 22:59 MTG 75 -354 ds - l,2

_ ND ppbv 0.030 5 . 73 11 / 30/ 04 22:59 MTG 156 -59 -2 tmns - l,2 - Dichioroethene ND ppbv 0.0 3 0 5.73 11 /3 0/ 04 22:59 MTG 156 -60 -5 Methylene chloride 0 .090 pp b v 0.086 5.73 11 / 30/ 04 22:59 MTG 75 -09 -2 1 , 1,2,2-Telnchloroethane ND ppbv 0 . 030 5.73 11 /3 0/ 04 22:59 MTG 7

9- 34-5 Teb - addoroethene ND ppbv 0.030 5.73 11 /3 0/ 04 22:59 MTG 1"_7 - 18 -4 1, 1 ,l - Trtchloroelhane ND ppbv 0.029 5 . 73 11 /3 0/ 0422:59 MTG 71 -55 -6 1,1,2 - T

_thane ND ppbv 0 . 030 5.73 11 /3 0/ 0422:59 MTG 79 -00 -5 T

_ 0 . 062 ppbv 0 . 0 29 5.73 11 / 30/ 04 22:59 MTG 79 -01-6 Vinyt c

_ lodde ND ppbv 0.0 29 5.73 11 / 30/ 04 22:59 MTG 75 -01

_ I

Date: 12/

02/ 2004 Page 4 of 10 

### REPORT

OF LAB O RAT O RY

ANALYSIS This mpod shal not be relxodcced, exe rt in full, WglX

_ I

_ _ i a en oo r_ nt of F

_e Analyl

_ _M_ . Inc.. 

# 2, '. 3 0 0 2 71700 Elm Street, Suit e 200 Minn -- , MN 55414 Phone:(612)607-1700 Fax: (612)607.6444 

### ANALYTICAL RESULT S Project: 103214 Project ID: EAFB ERS 74311.01 . 1504 Solid results are reported on a dry weight basis. La b ID: 10 3 214002 Date Collected: 11 / 15/ 04 15.O5 Malrix: Air Sample ID: 135-PRIDEHANGAR-E Date Received: 11 / 16/ 04 09:30 Parameters Results Units Report Limit DF Prepared By Analyzed By CAS No. Qual RegLmt 

### l Ur TO15 MSV AIR SIM A nalytical Method: TO-15 by SIM Carbon te(rachlodde 0.10 ppbv 0 . 026 5.04 11 / 30/ 04 22:02 MTG 56-23 -5 Chlorofom

_ ND pp b v 0 . 026 5. 04 11 / 30/ 0422:02 MTG 67 -66 -3 Cldorome(hane 0.37 ppbv 0 . 026 5. 04 11 / 30/ 0422:02 MTG 74 -87 -3 1,1 - Didd moelhane ND ppbv 0.055 5 .04 11 / 30/ 04 22:02 MTG 75 -34 -3 1

_ . _ lhane ND ppbv 0 . 026 5. 04 11 / 30/ 0422:02 MTG 107 -06 -2 1,1-Dichkxo e lhene NO ppbv 0.0 26 5. 04 11 / 30/ 0422:02 MTG 7 5

-3 5 -4 cts - l,2

_ ND pp b v 0.026 5 . 04 11 / 30/ 04 22:02 MTG 156 -59 -2 trans - l

_ - Dichlon

_thene NO ppbv 0.026 5. 04 11 / 30/ 04 22 :02 MTG 156 -60 -5 Methylene chloride 0 . 12 pp b v 0.076 5. 04 11 / 30/ 04 22:02 MTG 75-09 -2 1,1,2,2-Telraddoroethane NO pp b v 0.026 5. 04 11 / 30/ 04 22 :02 MTG 7 9- 34 -5 Telra chkxoethene 0 . 048 ppbv 0.026 5.04 11 / 30/ 0 4 22:02 MTG 127 - 18-4 1 , 1,1 - Trichloroethane ND pp b v 0 . 026 5 . 04 11 / 30/ 04 22:02 MTG 71 -55 -6 1,1,2 . Tdchloroethane ND pfl b v 0 . 026 5. 04 11 / 30/ 0422:02 MTG 79 -00 -5 T

_ 0.053 ppbv 0.026 5. 04 11 / 30/ 0422:02 MTG 79 -01 -6 Vinyl ¢hlodde ND ppbv 0.026 5. 04 11 / 30/ 04 22:02 MTG 75 -01 -4

Date: 12/

02/ 2004 Pag e 5 of 10 

### REPORT OF LABORATORY ANALYSIS 11

_s

_xxt shal not be

_duced , e.¢

_ _ lul, wlthout he wfllten c

oesent of Pace An

_ Servlces. Inc . . 

# 0281700 ElmStreet,

Su ll e 200 f w Ww . _ .co m Minneapolis, MN 55414 Phone: (612)607-1700 Fax: (612)607-6444 

### ANALYTICAL RESULTS QUALIFIERS Project: 103214 Project ID: EAFB ERS 74311.01.1504 PARAMETER QUAUFIERS

DF - Dilution Factor, if reported, represents the factor ND - Nc4Dete c

t ed at or aboveadjust ed

reporting

limit, applied to the repoded

data clue to changes in sa m ple preparation,

dilution of the sample

aliquot, or .moi ' sture contenL J - EsC " nat ed

concentmlion

a bove the adjust ed

method cle l e c ti on limit and below

the adjust ed

reporting

limit . MDL - Adjust edMethod Detect i_ I

_ k

_. S - Surrogate

Date: 12/ 02/ 2004 Page 6 of 10 

### REPORT OF LAB O RATORY ANALYSIS Thls mpod

shal not b e mp c 0du c ed, e.cept In ful, wlthout lhe _K 1 m n

consent of Pace A M lytk

_ Se

_o m s,

Inc. 

# 2 30 029Pace A.alyffcd Serdc u , Inc .

• O 1700 Bm Street, Suite200 Minnea

_ , MN 55414 Phone:(612)607-1700 Fax: (612)607 .-6444 QUALITY C

ONTROL DATA Project: 103214 Project ID: EAFB ERS 74311.01 . 1504 QC Batch: AIR/ 1277 Analysis Method: T0-15 by SIM QC Batch Method: TO - 15 by SIM Analysis Description: TO - 15 GC J MSV AIR SIM Associated Lab Samples: 103214001 103214002 METHOD BLANK: 28151 Associat ed Lab Sa mples: 103214001 103214002 Blank Reporting Parameter Units Result U m lt Qualifmm Carbon tetrad

_odde ppbv ND 0 . 0052 Chloro f orm ppbv ND 0 . 0052 Chlorom at harm ppbv ND 0.0052 1 , 1 - Dichloroelhane ppbv ND 0.011 1,2-Dichloroelhane ppbv ND 0.0052 1 ,l-Di ch loloelhene ppbv ND 0.0052 cts - 1,2 - DiddoroeS

_ me pp b v ND 0 . 0052 tmr-, = , - 1,2 - Dichloro at hene ppbv NO 0.0052 Me thylene chloride pp b v ND 0.015 1,1,2,2-'re baddoro at hane ppbv ND 0.0052 Te baddoro at he l_ ppbv ND 0 . 0052 1 , 1,1-Tdchloroethane ppbv ND 0.0051 1,1 , 2-T

_ lhane pp b v NO 0 . 0052 Tdchloroethene ppbv ND 0 . 0051 Vinyl chlodde ppbv ND 0 . 0051
LABORATORY CONTROL SAMPLE: 28152 Spike LCS LCS % Rec Paramet er Units Conc . Resu lt % Rec Limits Qualifie r s Carbon te

_ ppbv 0 . 11 0.13 118 70 - 130 Chloroform ppbv 0.11 0 . 11 103 7 0- 130 Chlorom at hane ppbv 0 . 1 0.12 118 7 0- 130 1,1-Dichkxoelhane ppbv 0.1 0.12 114 7 0- 130 1,2

_ ppbv 0 . 11 0.11 106 7 0- 130 1,1-Diddoro at hene pp b v 0 . 11 0.12 112 7 0- 130 ds-l,2-Dichloroethene

__ ppbv 0 . 11 0 . 11 104 7 0- 130 t r ans-1,2-Diddomethene" ppbv 0 . 1 O. 10 102 7 0- 130 Me thylene chloride ppbv 0.11 0 . 12 116 70.130 1 , 1,2,2 - T_ pp b v 0.1 0.094 90 7 0- 130 T at nchlomelhene pp b v 0.1 0.10 98 7 0- 130 1,1,1 - Trichloro at hane pp b v 0 . 1 0.13 124 70 - 130 1,1,2 - Triddoro at hane pp b v 0 . 1 0.096 92 7 0- 13 0 Tri ch kxoeqhene ppbv 0.1 0.10 101 7 0- 130 Vinyl chl0dde ppbv 0.1 0.13 127 70-130 Date: 12/

02/ 2004 Page 7 of 10 REPOR T OF LABORATORY ANALYSIS This mp

_ shall no1 be reproduced, excel

_ Jn ful, wRho u t he wd U_ con N n l of Pace A nalytical

Sen4ces.

I nc.. 

# 2, 1 30 0301700 Elm Street, Su

_ 200 Minneapolis.

MN 55414 Phone: (612)607-17 0

0 Fax: (612)607-6444 QUALITY CONTROL DATA Project: 103214 Project ID: EAFB ERS 74311 . 01.1504

SAMPLE DUPUCATE: 28153 - - 103214001 DUP Max Parameter units Result Result RPD RPD Quarte rs Carbon tetrachloride ppbv 0.055 0.057 3 30 Chloroform ppbv ND ND 30 1 Chloromethane ppbv 0.43 0 . 43 1 30 1,1 - Diddoro e

than e ppbv NO ND 30 1 1,2 -
_thane ppbv NO ND 30 1 1 ,1-Dichloroethene ppbv ND NO 30 1 cis-l,2

_ ppbv ND ND 30 1 tmns-l,2-1 Y

cldoroethene pp b

v ND ND 30 1 Methylene

chloride ppbv 0.090 .0.094 4 30 1,1 , 2,2-Te

_ ppbv ND ND 30 1 T

_ ppbv ND ND 30 1 1,1,1 - T

_thane ppbv ND ND 30 1 1,1,2-Trichloroethane ppbv ND ND 30 1 Tdchloroethene ppbv 0.062 0.062 0.4 30 Vinyl chloride ppbv NO ND 30 1

Date: 12/ 02/ 2004 Page 8 of 10 REPORT OF LABORATORY ANALYSIS Th k mpo d

sha = m X b e re p rodu c

ed, e == e

_ _ U , w m ho u t the wflttee ¢omeet of Pace A nalylk=l Sen

_ , In c. . 

# 21 3 0 03 11700 Elm Stme

_Suite 200
w ww.pac

_ . c

o m Minneapolis. MN 55414 Phone: (612)607-1700 Fax: (612)607-6444 Q U ALITY CONTROL DATA QUALIFIERS Project: 103214 Project ID: EAFB ERS 74311 . 01.1504 QUALITY CONTROL PARAMETER QUALIFIERS

Consiste n t w i th EPA guidelines, umounded data are disp le yed and have been used to calculat e % recovery and RPD values . LCS(D) - Laborato ry Control Sample (Duplicate) MS(D) - Matrix Spike (Duplicate) " " DUP - Sami t e Du

_ icate RPD - Relat i ve Percent Differen c e ND - Not Detected at or above adjust ed reporting limit. J - Estimated concerdmtion above the adjusted method MDL - Adjusted Method Detection L imit . dete c U on limit a nd below the adjust ed reporting lim it . S - Surrogate QUALITY CONTROL ANALYTE QUAMRERS [1] The sample and duplicate results f or this pa r amet

_ are le ss than the reporting limit.

_ RPD ca n not be calculated .

- 7

Date; 12/

02/ 2004 Page 9 of 10 REPORT OF LABORATORY ANALYSIS This repo rt

shal not be mt:

_duced,e

_op4 r n ful. witho,t U l e wrm

_ _ nsent of Pa

_ A nolytk

_ . Se

_cm

_ In

_ 

# ' 3 0 03 2

. t

_. • • 5 ,1700 Elm Street, S uite 2O0 Minneapolis,

MN 55414 Phone: (612)607-1700 Fax: (612)607 -6444 

### QUALITY C

ONTROL DATA CROSS REFEREN CE TABLE Project: 103214 Project ID: EAFB ERS 74311.01.1504 

### An

_t

_ La b ID Sample ID QC Batch Method QC Batch Analytical Method Batch 103214001 636 - PRIDEHANGAR - W TO - 15 by SIM AIR/ 1277 103214002 135 - PRIOEHANGAR - E TO - 15 by $1M AIR/ 1277

Date: 12/

02/ 2004 Page 10 of 10 

### RE PORT

OF LAB O RATORY

ANALYSIS wilho u t the

_tl o n ¢ommrlt

o f Pace A nalylcal Sen4oel. k¢,. 

# ,e_. 2,: 3 0 0 3 3PI ce A

_w lytical S endces,

In c. 1700 ElmStreet Minneapolis,

MN 55414 Phone: 612.607 . 1700 m .pa celabs. com Fax : 612.607 . 6444

Client: E arth Tech Lab Pr o ject N umber: 1 0 3 2 14 Ph o ne: 9 1 9-85 4 -62 3 9 Pr o ject Name: EAPB E RS 743 11 .01. 1 5 0 4 Lab Sample N o : 101 2 Pr o jS ampleNum: 10 32 1 40 0 2 Da t e C ol lected: 11 / 1 5 / 0 4 1 5:05 Client S ample i -PRID E HANGAR- E Matrix: A i r Dat e Rece i ved: 11 / 16 / 0 4 9:3 0 Param eters Results Un i ts Report Li m it Analyzed CASN o . Ftn o te 

## Air T O - l! 1 -Trichl o r o ethane ND u g /m3 0. 14 11 / 30 / 04 22: 0 2 MTG 71-55-6

2-Tetrach lo r o e t hane ND u g l m3 0 . 1 8 11 1 3 0 / 0 4 22: 0 2 MTG 79-34-5 1 , 1 ,2-Trich lo r o ethane ND ug l m3 0 . 1 4 11 1 3 0 1 04 22: 0 2 MTG 79- 00 -5 l, l -Dichl o r o ethane ND ug /m3 0 .23 1 1 / 3 0 / 0 4 22: 0 2 MTG 75-34-3 l, l -Dichl o r o e t hene N D ug /m3 0 .I 1 1 1 3 0 1 0 4 22: 0 2 MTG 75-35- 4 1,2-D i chl o r o ethane ND ug l m3 0.11 1 11 30 / 0 4 22:02 MTG 107-06-2 Carb o n tetrach lo r id e 0 .6 4 u g /m3 0 . 1 7 11 / 30 / 0 4 22: 0 2 MTG 56-23-5 Ch lo r o f o rm ND ug /m3 0 . 1 3 11 1 30 1 04 22: 0 2 MTG 67-66- 3 Ch lo r omethane 0 .777 ug / m 3 0 . 0 55 11 1 30 / 04 22: 0 2 MTG 74-87- 3 cis- l , 2 -D i ch lo r o e t hene ND ug /m3 0 . 1 11 1 3 0 / 04 22: 0 2 MTG 1 56-59-2 - Methy l ene chl o r i de 0 .424 u g l m 3 0 .27 11 1 30 1 0 4 22: 0 2 MTG 75- 0 9-2 Tetrach lo r o ethene 0 .33 1 ug /m3 0 . 1 8 11 / 3 0/04 22: 0 2 MTG 1 27- 1 8- 4 t rans- l , 2-D i ch lo r o ethene ND ug /m3 0 . 1 11 / 3 0 / 0 4 22: 0 2 MTG 1 56-60-5 Trich lo r o ethene 0 .29 ug /m3 0 . 1 4 11 / 30 1 0 4 22: 0 2 MTG 79- 01 -6 Viny l chl o ride ND u g /m 3 0 .068 1 1 1 30 1 0 4 22:02 MTG 75- 01 - 4

DISCLAIM E R: These results have been c o nverted t o t he units sh o wn fr om the o r ig inal un it s o f measurement assum i ng 20 d egrees Ce l sius a nd 1 at m o sphere pressure. Values were n ot r o u nded acc o r di n g t o E PA r oundi ng rules. THC is quant i tated bas ed o n the average resp o nse fact o rs o f several c o mp o u nds; the n om i nal mol ecu l ar weight o f THC used f o r un i t s c o nversi o n i s t he avera g e o f the mol ecu l a n weights o f the c o mp ounds us ed f o r quant i ta t i o n.

SUPPLEMENTAL REPORT _t® :: 2/ 2/ 2 oo

_ Ur

_ CorlversionRequest P_ 2



# REPORT OF LABORATORY

ANALYSISThis report shag

not be reproduced,

e xcept in full, 

# 2430 03 4Pace Ana lytical Sendces, Inc. 1700 Elm Street " " "[/I" 1

_ .. _ 1 ® Minneapolis, MN 55414

. x ..v ..,. - Phone: 612 . 607 . 1700 m .pacelabs.com Fa r 612. 607. 6444

Cl i en t : E arth Tech Lab Pr o jec t Number: 1 0 3 2 1 4 Ph o ne: 9 1 9-854-6239 Pr o jec t Nam e: E AFB E RS 74 311 .0 1 . 1 50 4 Lab Sampl e N o : 10 L Pr o jS amp l eN um: 1 032 1 4 0 0 1 Date C ol lec t ed: 11 / 1 5 / 0 4 1 5: 0 5 Client Samp le ID: Ma t r i x: Air Da t e Received: 11 / 1 6 / 0 4 9:3 0 Parameters Resu lt s Un it s Report L i mit Analyzed CAS N o . F t n o te 

## Air TO -I! 1 -Tr i ch lo r o ethane ND ug /m3 0 . 1 6 11 / 30 / 04 22:59 MTG 7 1 -55-6

2-Tetrachl o r o e t hane ND ug /m3 0 .2 1 11 / 30 / 0 4 22:59 MTG 7 9 -34-5 1 , 1 0 2-Tr l ch lo r o e t hane ND ug /m 3 0 . 1 7 11 / 3 0 / 0 4 22:59 MTG 79- 00 -5 l, l -D i chl o r o e t hane ND ug / m 3 0 .26 1 1 / 3 0 / 0 4 22:59 MTG 75-3 4 -3 1 , 1 -Dichlor o ethene ND ug /m3 0 . 1 2 11 / 3 0 / 04 22 : 5 9 MTG 75-35-4 1,2-Dichl o r o e t hane ND u g /m3 0 .12 1 1 / 3 0 / 04 22:59 MTG 1 07- 0 6-2 Carb o n t etrach lo r i de 0.352 ug / m 3 0 . 1 9 11 / 30 / 0 4 22:59 MTG 56-23-5 Ch lo r o f o rm ND ug /m3 0 . 1 5 11 / 30 / 0 4 22:59 MTG 67-66-3 Ch lo r ome t hane 0 . 9 03 ug /m3 0 . 0 63 11 / 30 / 0 4 22:59 MTG 74-87-3 cis- l , 2-Dlchl o r o e t hene ND ug /m3 0 . 1 2 1 1 / 3 0 / 0 4 22 : 59 MTG 1 56-5 9 -2 - Me t hy l ene ch lo r i de 0 .3 1 8 ug /m3 0 .3 11 / 30 / 0 4 22:5 9 MTG 75- 0 9-2 Te t rachl o r o e t hene ND ug / m 3 0 .2 1 1 1 / 3 0 / 0 4 22:59 MTG 127-18- 4 t ran s - l ,2-Dich lo r o e t hene ND ug / m 3 0 . 1 2 11 " / 3 0 / 0 4 22:5 9 MTG 1 56-60-5 Tr i chl o r o e t hene 0 .3 39 ug / m 3 0 . 1 6 11 / 30 / 04 22:5 9 MTG 7 9 - 01 -6 Viny l chl o r id e ND ug /m3 0.075 1 1 / 3 0 / 0 4 22:5 9 MTG 75-0 1 - 4
b DISCLAIMER: These resu l ts have been c o nvert ed to theun it s sh o wn fr om the o rig i na l

uni t s o f measurement ass um i ng 2 0 degrees Ce l s i us and 1 a tmo s p here pressure. Va l ues were n ot r o u nded acc o rding to E PA r ound i ng ru l es. THC i s q uant lt at ed based o n the average resp o nse fact o rs o f several c omp o unds; t he n omi na l mol ecular weight o f THC us ed fo r unit s c o nvers io n i s the average o f t he mo! ecu l a

_ weight s o f t he c omp ounds us ed f o r q uant it a t i o n.

- 7


## SUPPLEMENTAL REPORT

_ . t.: ,_12/2 oo, Units Co n verr

_ Requ

_t P ,, _ , 1 

# REPORT OF LABORATORY

ANALYSISThi s report

shall not bereproduced,

except in full, 

# without the tten cons of Pace hnalyli c Sen / ks, Inc . 2 30 035
•

_ , _ Ac c o,o •



## . o

_ , _

### Annotate d Comments

Pride Hangar Source Area Treatment Draft Work Plan . S e rial L ette r ERS- 3 -RA- 14 9, dated 21 D e cemb e r 2004 South Dakota D epartment of Environm ent and Natural Resource s 1 . Page 2, Section 1.1 Treatment Status, second paragraph, last sentence: A dd a sentence to note that detection limits for vinyl chl oride have been high (100-1,000 ppb ) in many of the samples. Response: Agreed . This revision has been made . 2. Page 4 , S ec tion 1.2 Rec ommended El ec tron Donor Inj ec tion : A. First paragraph, first bull et : The Draft Explanati on o f Signifi cant Differences should also be edited to include a provision for sodium lactate injection. Edit text as appropriate. Response: Agreed . This revision has been made . B. First paragraph, firs t bullet, s ec ond sentence : Please send me a copy o f this letter. Response: The letter has not been sent to EPA yet . It will be submitted upon final appro val of this work plan . C. Firs t paragraph, s e cond bullet : Ad d text to specify the number o f weeks proposed for sodium lactate injection. Response: Text has been added to clarify the proposed period of injec tion . 3. Page 5, Section 1 .3 Recommend ed Monitoring S cope and Procedures : A . Firs t paragraph, firs t bullet, first sentence : "Four inj ec tion / monitoring wells

__are rec omm end e d e ast west and south of MW04 1 102 to be us e d for inj ec tion o f " the so dium lac tate solution ." Respons e: Agreed. Th is revis ion has been made . B. Firs t paragraph, second bullet: Would it be possib l e to install a third monitoring well northe ast of MW041101 to monitor the do w n-gradient impac ts o f the original s oy oil inj ec tion ? Anothe r option would be to move one of the propos e d new wells ab out 20 f

eet northwe st.
Annotate d C omm ents from S D DENR Pride Hangar Are a Treatment Wo rk Plan 1 1 8 F ebruary 2 00 5 

# 2,'. 30 037

### Response: Ag reed . Th is revision has been made . C. Third p aragraph, first s entence : Dissolved oxygen concentrations should also be measured at each monitoring well. Edit text as appropriate. Response: As agreed during the RPM discussion on January 25, the work plan includes annual field measurement of DO . D. Third p aragraph, last sentence : During review of recent reports, I've noted that the detection limits for vinyl chloride at the on-site lab are often 10 u g / L, while detection limits for other chemicals are 1 or 2 u g / L. Given that vinyl chloride is an important daughter product of TCE dechlorination, it is important that the on-site lab be capable of consistently detecting it at concentrations at or below the Ground Water Quality Standard of 2 u g / L. Please provide assurances that the on-site lab can meet this criterion except under situations where it is necessary to dilute high-concentration samples. Response: We plan to continue the use of the on - site lab for this work, since pe troleum interferences are not an issue at this site . We are evaluating the detection limit for vinyl chloride this mon th in an effort to improve the detection limi t . However, a slightly higher detection limi t for vinyl chloride is no t a major concern because the Pride Hangar treatment area is dis tant from the installation boundary . 4. Page 6, Section 1.3 Recommended Monitoring Scope and Procedures : A . First paragraph, fi rst bullet, f i rst sentence : I rec ommen d diss o lved g a s analyses also be conducted on samples from MW941102 and the two new wells. I also recommend that samples be analyzed for these parameters prior to injection to establish baseline conditions. Edit text as appropriate. Response: As agreed during the RPM discussion on January 25, the work plan includes annual analysis for dissolved gases a t the o ther monitor wells . B. First paragraph, firs t bullet, s ec ond and third sentences: Since chloride ions are reportedly released during abiotic reduction of chlorinated solvents, I recommend samples also be analyzed for chloride. Response: As agreed during the RPM discussion on January 25, t he work plan includes sampling of aU moni tor wells for chloride twice per year C. Sec ond p aragraph: Dissolved oxygen concentrations should also be measured. Edit text as appropriate. Re sponse: Agreed . See Item 3 . C above . Annotate d Co mm ents from SD DENR Pri de Hangar Are a Tre atm ent Wo rk Plan 2 ! 8 F eb ruary 200 5 

# 2, 13 0 03 8

### 5 . Page 10, Section 2.5 Ambient Monitoring, second complete paragraph, s ec ond sentence : I re comm end comparing sampling re sults to the most recent EPA Re gion 1 1I Risk-Bas e d Concentrations for amb i ent air, in addition to the Target Indoor Air C oncentrations . E di t text and Tabl e 5 as appropri ate. Response: Agreed . This information has been added to the work plan . 6. Pag e 11 : A. Se ction 2.6 S ampl e Proce dure s, s e cond paragraph : Table 5 presents a s ummary of d etec te d res ult s in ai r sampl es . Pro vid e a tabl e w ith the ref e rence d information and edi t text as appropri ate . Response: The text has been revise d to reference Ta ble 6 . B. Section 3.0 Prid e Hangar Source Treatment S tudy Timing and Reporting, second paragraph: S e ction 1 . 3 re comm ends installation o f f our inj e ction wells . Edit as appropriate to be consistent . Response: Th is co rrec tion has been made in the work plan . 7. Tables 1, 2, 3 and 5 : I request that the tables be edite d to include all analyti cal results, including non-detects. Present non-detects as "<##" rather than a blank space or dashed lines. While this can create rather messy tables, it is important to compare detection limits to standards or screening levels. Respo nse: " Less t

han " values have been en tere d to re place the " non - detec t " values . 8. Table 4, S VE O perational Monitoring Results : Add a f ootn o te to explain the m eeting of the a s te ri s k s in the tab l e . Response: A footno te has been added.

Annotate d C o mm ents f rom SD DENR Prid e Han g ar Are a Tre atm ent Work Plan 3 1 8 F eb ruary 200 5 

# 2 30 0 3 9