Washington State Department of Ecology

Publication Summary

Title

Lakewood Plaza Cleaners, June and November 2005 Groundwater Monitoring Results

Month-Year Published

January 2006

Online Availability

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Short Description

Annual groundwater monitoring at Lakewood Plaza Cleaners was conducted in June and November 2005. Three wells continue to have PCE concentrations that do not meet (exceed) the MTCA cleanup standard of 5.0 ug/L: monitoring wells MW-20B (413 and 555 ug/L) and MW-16A (80.3 and 43 ug/L), and municipal well H2 (14 and 6.4 ug/L). TCE was detected in MW-20B at concentrations of 6.6 and 6.4 ug/L, which exceed the MTCA cleanup standard of 5.0 ug/L. Most concentrations are within the range of values reported in previous samplings.

From November 2004 to November 2005, PCE concentrations more than doubled in MW-20B. PCE concentrations in well MW-16A detected in June 2005 also had increased.

(Also see abstract below)

Publication Number

06-03-010

Author(s)

Marti, P. and T. Roberts

Print Availability

Request from the program.

Number of pages

18 pp.

Keywords

groundwater, Model Toxic Control Act, monitoring, results, toxic, wells

Subject Waterbodies

Clover Creek

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Lakewood Plaza Cleaners, June and November 2004 Groundwater Monitoring Results

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Lakewood Plaza Cleaners, May and September 2006 Groundwater Monitoring Results

part of a series

Abstract

Long Description

This progress report is one in a series describing results of long-term groundwater sampling at Lakewood Plaza Cleaners south of Tacoma. Results of volatile organics in samples collected from ten monitoring wells and one municipal well in June 2005, and four monitoring wells and one municipal well in November 2005, are included.

Monitoring wells MW-20B and MW-16A, as well as municipal well H2, continue to have tetrachloroethene (PCE) concentrations exceeding the Model Toxic Control Act (MTCA) cleanup standard of 5.0 ug/L. PCE concentrations in these wells during June and November were: MW-20B (413 and 555 ug/L), MW-16A (80.3 and 43 ug/L), and H2 (14 and 6.4 ug/L).

Trichloroethene (TCE) also was detected in MW-20B at concentrations of 6.6 and 6.4 ug/L, which exceeds the MTCA cleanup standard for TCE of 5.0 ug/L.

Cis-1,2-dichloroethene (cis-1,2-DCE) was detected in wells MW-20B (12 and 11 ug/L) and MW-16A (2.8 and an estimated 0.96 ug/L). The federal maximum contaminant level for cis-1,2-DCE is 70 ug/L.

Although most concentrations are within the range of those reported in previous samplings conducted since 1991, PCE concentrations more than doubled in MW-20B from November 2004 to November 2005. PCE concentrations in well MW-16A detected in June 2005 also had increased, and PCE concentrations in municipal well H2 continue to be elevated.

Link to EIM data for User Study ID LAKEWOOD

This page last updated March 3, 2008