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Publication Summary

Title

Lakewood Plaza Cleaners Groundwater Monitoring Results, May and October 2008

Month-Year PublishedMarch 2009
Online Availability
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Short Description

Annual groundwater monitoring at Lakewood Plaza Cleaners near Tacoma was conducted during May and October 2008.

  • Three wells had PCE concentrations higher than the MTCA cleanup level of 5 ug/L: monitoring wells MW-20B (143 and 258 ug/L) and MW-16A (55 and 31 ug/L), and municipal wells H2 (9.6 ug/L) and H1 (5.1 ug/L). PCE concentrations in well MW-16 appear to be steadily rising.

  • Well MW-20B had a TCE concentration (5.5 ug/L) higher than the MTCA cleanup level of 5 ug/L.

  • Cis-1,2-DCE was detected in MW-20B (12 and 9 ug/L) and MW-16A (2.8 and 0.6J ug/L). The federal Maximum Contaminant Level for cis-1,2-DCE is 70 ug/L.

    (Also see abstract below)
    • Publication Number09-03-012
    Author(s)Marti, P. and T. Roberts
    Print Availability
    Request from the program.
    Number of pages 28
    Keywords compliance, contaminant, groundwater, Model Toxic Control Act, monitoring, toxic, water, wells
    Subject Waterbodies
    Clover Creek
    map of Washington state showing locations of subject waterbodies
    Related Publications TitleRelationship    
    Lakewood Plaza Cleaners, June and October 2007 Groundwater Monitoring Resultspart of a series
    Abstract Long Description

    This progress report is one in a series describing results of long-term groundwater sampling at the former Lakewood Plaza Cleaners site south of Tacoma. The report includes results of volatile organics in samples collected from project monitoring wells and Lakewood Water District municipal wells in May and October 2008.

  • Monitoring wells MW-20B and MW-16A, as well as municipal wells H1 and H2, continue to have tetrachloroethene (PCE) concentrations higher than the Model Toxic Control Act (MTCA) cleanup level of 5 ug/L. PCE concentrations in these wells during May and October were: MW-20B (143 and 258 ug/L), MW-16A (55 and 31 ug/L), H2 (9.6 ug/L in May), and H1 (5.1 ug/L in October).

  • PCE was also detected in well LPMW-2 in May at a concentration of 2.5 ug/L. This well is located near the former septic system of Plaza Cleaners which was identified as the source of the contamination.

  • Trichloroethene (TCE) was detected in MW-20B during May and October at concentrations of 5.5 and 4.5 ug/L. The May result exceeds the MTCA cleanup level for TCE of 5 ug/L.

  • Cis-1,2-dichloroethene (cis-1,2-DCE) was detected in wells MW-20B (12 and 9 ug/L) and MW-16A (2.8 and an estimated 0.6 J ug/L). The federal maximum contaminant level for cis-1,2-DCE is 70 ug/L.

    Most concentrations remain within the range of those reported in previous samplings conducted by the Washington State Department of Ecology since 1991. However, PCE concentrations in well MW-16A appear to be steadily rising. Average PCE concentrations rose from 8 ug/L in 1992 to 77 ug/L in 2006. The average PCE concentration in well MW-16A in 2008 was 43 ug/L.

    Compliance with the groundwater cleanup goals have not been met for this project. The project should be evaluated to determine what follow-up actions are needed for this site to meet the cleanup goals in a reasonable timeframe.

    Link to EIM data for User Study ID LAKEWOOD


    • This page last updated March 20, 2009

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