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Well House #2 Summary

City of Clearwater Public Information on the Air Stripping Treatment System Installation at Well #2 at 4th/Ross.

As taken from the report summary by Aquaterra Environmental Solutions, Inc.,  Aquaterra installed an air stripper owned by the Kansas Department of Health and Environment (KDHE) in a new concrete block well house to treat impacted water from Public Water Supply Well #2.  The system design was in general accordance with Aquaterra’s proposal, and as agreed upon between KDHE, the City of Clearwater, and Aquaterra.

The City of Clearwater’s Public Water Supply Well #2 (PWS #2) is located on the northwest corner of the intersection of Ross Avenue and North 4th Avenue.  The PWS#2 well is adjacent to the city’s water tower and just south of the Aquatic Center.  The well is impacted with tetrachloroethene (PCE) from an unknown source.  Historic monitoring of the wells in the vicinity of PWS#2 indicate the PCE concentration in PWS#2, during an operating mode, could rise to approximately 25 micrograms per liter (ug/l).  The following table (Table 1) summarizes historical PCE concentrations in groundwater samples collected from PWS#2.

Table 1 – Groundwater Analytical Results, PWS #2, Clearwater, KS

Date Sampled

PCE (ug/l)

Date Sampled

PCE (ug/l)

8-18-1985

4.3

01-11-1996

0.5

10-10-1985

8.1

09-14-1998

<0.5

01-23-1989

76.5

03-12-2004

2.5

03-20-1989

58.7

04-20-2005

1.8

03-18-1991

14.1

01-10-2007

2.2

09-1991

14.1

06-27-2007

0.73

Because of this historical data, the City of Clearwater in coordination with the State of Kansas and Aquaterra, applied for a permit to install a tray aerator in PWS#2 to treat well water to remove PCE.  The permit was approved and the tray aerator has been installed.

Currently, levels of PCE in the well are less than Maximum Contaminant Levels allowed for potable water use.  However, the design of the tray aerator and the system surrounding it is based on PCE levels reaching two times the highest level in project monitor wells (25 parts per billion) for an influent concentration of 50 parts per billion.  Copies of the design model for the particular model of tray aerator that is installed at PWS#2 show that a single tray system will reduce the PCE concentrations to less that 1 part per billion with a 50% factor of safety using the coldest inlet air conditions.  Since the tray aerator system that was installed included three trays, the system will have a factor of safety of two for the additional trays plus an additional factor of safety due to the design assumptions.  In addition, the treated water will be pumped into the water supply system in the morning, when demand is highest, the treated water will be further blended with water from the water tower, further protecting the quality of the drinking water supply.

Initial testing of the system was conducted on June 27, 2007.  PWS#2 was operated for approximately 1.5 hours before influent and effluent water samples were collected by Aquaterra and KDHE.

Table 2 – Treatment System Analytical Results, PWS#2, Clearwater, KS

Date Sampled

Influent PCE (ug/l)

Effluent PCE (ug/l)

06-27-2007 (Aquaterra)

Not Detected (1)

Not Detected (1)

06-27-2007 (KDHE)

0.73

Not Detected (0.5)

Laboratory reporting limit indicated in parenthesis for non-detected results.

This information as presented is only a portion of the construction documentation report on the PWS#2 Air Stripping Treatment System Installation as prepared by Patrick Goeke, P.E., Senior Project Manager for Aquaterra.   This information is presented to you as a part of the justification for the work done on PWS#2 and the initial results that have been achieved.  If you have any questions, please call City Hall at (620) 584-2311.

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