Washington State Department of Ecology

Publication Summary

Title

Lakewood Plaza Cleaners, June and October 2007 Groundwater Monitoring Results

Month-Year Published

April 2008

Online Availability

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Short Description

Annual groundwater monitoring at Lakewood Plaza Cleaners near Tacoma was conducted during June and October 2007.

Three wells had PCE concentrations higher than the MTCA cleanup level of 5 ug/L: monitoring wells MW-20B (204 and 491 ug/L) and MW-16A (83 and 24 ug/L), and municipal well H1 (5.2 ug/L). PCE concentrations in well MW-16 appear to be steadily rising.

Well MW-20B had a TCE concentration (7.5 ug/L) higher than the MTCA cleanup level of 5 ug/L.

Cis-1,2-DCE was detected in MW-20B (7.8 and 15 ug/L) and MW-16A (2.5 and 0.64J ug/L). The federal Maximum Contaminant Level for cis-1,2-DCE is 70 ug/L.

(Also see abstract below)

Publication Number

08-03-010

Author(s)

Marti, P. and T. Roberts

Print Availability

Request from the program.

Number of pages

Keywords

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

Subject Waterbodies

Clover Creek

Related Publications

Title

Relationship

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 the former Lakewood Plaza Cleaners site south of Tacoma. The report includes results of volatile organics in samples collected from nine monitoring wells and one municipal well in June 2007, and four monitoring wells and one municipal well in October 2007.

Monitoring wells MW-20B and MW-16A, as well as municipal well H1, 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 June and October were: MW-20B (204 and 491 ug/L), MW-16A (83 and 24 ug/L), and H1 (5.2 and 3.8 ug/L).

PCE was also detected in well LPMW-2 at a concentration of 4.8 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 at concentrations of 4.4 and 7.5 ug/L, the latter of which 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 (7.8 and 15 ug/L) and MW-16A (2.5 and an estimated 0.64 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 since 1991. However, PCE concentrations in well MW-16A appear to be steadily rising. Average PCE concentrations have increased from 8 ug/L in 1992 to 77 ug/L in 2006. The average PCE concentration in well MW-16A in 2007 was 54 ug/L. PCE concentrations in municipal well H1 remain near the MTCA cleanup level.

Link to EIM data for User Study ID LAKEWOOD

This page last updated April 14, 2008