Central and Camelback Central and Camelback WQARF SiteWQARF Site

Wendy Flood, Community Involvement Coordinator

August 20, 2013 6:00pm

Andre Chiaradia, Unit Manager

Kevin Snyder, Project Manager

EW-1

EW-4

EW-3

EW-2

CC-5

SVE-1

SVE-2S

SVE-2D

SVE-MP1

SVE-MP2

SVE-FC

SVE Compound

Groundwater Treatment Compound

Events Since January 2013 CAB Meeting

• SVE system and groundwater treatment system continue to operate and are fully funded.

• Groundwater samples were collected from monitor wells during the first and second quarters of 2013.

• Groundwater samples were collected from the extraction wells and groundwater treatment system quarterly and monthly, respectively. Vapor samples were collected from the SVE system twice monthly or monthly.

Events Since January 2013 CAB MeetingEvents Since January 2013 CAB Meeting

• ADEQ prepares operation & maintenance (O&M) reports for the Groundwater Remediation and Treatment System and the Soil Vapor Extraction (SVE) System on a quarterly basis.

• Hydro Geo Chem, Inc. conducts site activities weekly to keep remediation systems operational.

• Hydro Geo Chem, Inc. compiles groundwater monitoring reports on a semi annual basis.

Events Since January 2013 CAB MeetingEvents Since January 2013 CAB Meeting

• Conducted Industrial Survey in the area.

• Conducted a passive soil gas survey along Central Avenue north of Camelback Road.

• Installed a groundwater monitor well on East Colter Street and one on East Medlock Drive.

Groundwater System Update

• The pumps in extraction wells CC-5 and EW-2 are only pumps currently in operation.

• EW-3 and EW-4 were shutdown because of low PCE concentrations in 2009.

• EW-1 was shutdown because of low pumping rate.

Groundwater System Update

• Repairs to the groundwater treatment system have included:

- shutdown of extraction well EW-1 and startup of extraction well CC-5

- granular activated carbon (GAC) replacement- gauge and valve replacement/calibration, and- sump pump switches replacement

Events Since January 2013 CAB Meeting

• The groundwater remediation and treatment system was started January 2003 and was fully operational February 2003. To this point the groundwater remediation and treatment system has removed approximately 286.1 lbs of PCE from groundwater.

• The soil vapor extraction (SVE) system was started November 2007. To this point the SVE system has removed approximately 5,713.4 lbs of PCE from soil.

Groundwater System UpdateGroundwater System Update

Quarter Gallons TreatedPercent

OperationalVOC/PCE Removed

(Lbs.)

1st Qtr 2013 4,878,540 74.0% 1.04/0.77

2nd Qtr 2013 5,139,680 83.9% 1.19/0.88

• A total of 336,529,705 gallons of GW have been pumped, treated and discharged as of 2nd qtr 2013.

• A total of approximately 286.1 lbs of PCE have been removed.

Groundwater System Update• Range of VOC concentrations for influent samples first half of 2003 and

first half of 2013:

AnalyteRange 1st & 2nd Qtr

2003Range 1st & 2nd Qtr

2013AWQS

Benzene <0.50 – 0.54 <0.50 5

Chloroform 1.8 – 2.8 2.7 - 5.2 100

cis 1,2-DCE 8.5 – 20 <0.50 - 0.82 70

PCE 350 – 740 17 - 23 5

TCE 9.7 – 16 2.7 – 3.7 5

1,2-DCA <1.0 <0.50 5

Concentrations In micrograms per liter (µg/L)

PCE Influent Concentration Changes with Time

PC

E C

once

ntra

tion

(ug/

L)

SVE (soil) System Update

• Granular activated carbon (GAC) change-out was done in February and May 2013.

• Conducting quarterly performance tests of system as required by renewed Air Quality Permit.

Operation & Maintenance Statisticsfor the Soil Vapor Extraction (SVE) system

Quarter Percent Operational PCE/TCE Removed (Lbs.)

1st Qtr 2013 90% 893.1

2nd Qtr 2013 91% 387.3

SVE Recovery With TimeC

um

ula

tive P

CE/T

CE R

eco

very

(lb

s)C

umu

lativ

e P

CE

/TC

E R

ecov

ery

(lb

s/da

y)

Recently conducted passive soil gas survey along Central Avenue north of Camelback Road.

Additional Site Investigation

Installed two groundwater monitor wells to better define edge of northern plume.

Additional Site Investigation

Future Planned Work

• Continue O&M Activities for both SVE and GW systems.

• Continue to monitor water levels monthly and collect groundwater samples quarterly as budget allows.

• Continue soil investigation in northern portion of site and install additional groundwater monitor wells in northern portion and drill and sample soil borings.