Commencement Bay Nearshore-Tideflats Partial NPL Site Deletion Data Collection Form | Region 10 | US EPA

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Commencement Bay Nearshore-Tideflats Partial NPL Site Deletion Data Collection Form


Basic Identifying Information

Site Name (as entered in CERCLIS): Commencement Bay Nearshore/Tideflats

CERCLIS ID Number: WAD980726368

NPL Site Location: City: Tacoma State: WA County: Pierce Zip Code: 98421

Name Given to Deleted Portions of the Site: St. Paul Waterway (Sources and Sediments); Blair Waterway (Sources and Sediments); Taylor Way Property; East-West Road Property; Blair Waterway Property; and the portion of the Blair Backup Property that drains to Blair Waterway.

Is this the first, second, third, etc. partial deletion at the site? (Enter the deletion number): 1

Name of Person(s) Completing Form: Allison Hiltner
Affiliation (agency/company): U.S. EPA
Phone Number: (206) 553-2140

Name of Person(s) Completing Electronic Locational Data: Matthew Gubitosa
Affiliation (agency/company): U.S. EPA
Phone Number: (206) 553-4059

BRIEF PARTIAL DELETION NARRATIVE:

This proposal for partial deletion pertains only to portions of Operable Unit (OU) 1 - Commencement Bay Nearshore/Tideflats Sediments, and Operable Unit (OU) 5 - Commencement Bay Nearshore/Tideflats Sources. Specifically, it pertains to the sediments contained in and upland properties draining only to the St. Paul or Blair Waterways, and to four properties which were transferred to the Puyallup Tribe of Indians under the Puyallup Land Settlement Act of 1989 ("Puyallup Land Settlement Properties"). The four Puyallup Land Settlement Properties proposed for deletion are the: Taylor Way Property, the East-West Road Property, the Blair Waterway Property, and the portion of the Blair Backup Property that drains only to the Blair Waterway.

The surface water and groundwater flow pathways for the Blair Backup Property are described in Section 2 of the report "Analysis of Alternatives, Blair Backup Property, Port of Tacoma, Tacoma, Washington", prepared by Hart Crowser for the Port of Tacoma, dated November 19, 1992. As shown on Figure 2-3 of that report, the generalized surface water and groundwater flow direction from the northeastern portion of the property is towards Hylebos Waterway. The generalized surface water and groundwater flow direction from the southwestern portion of the property is towards Blair Waterway. An approximate location of the groundwater divide at the property is shown on Figure 2-3. As stated in the text on Page 2-4, groundwater flow rates are very low and variations in these flow directions occur locally and with seasonal changes. For the purposes of the NOID, a conservative estimate of the groundwater divide (i.e., the approximate location of the divide was moved south to the most narrow portion of the property) has been used to identify that southwestern portion of the Blair Backup Property that will be delisted.

The St. Paul Waterway area identified for delisting represents the area of sediment characterization conducted as part of the St. Paul Waterway Remedial Action and Habitat Restoration Project. Sediment characterization occurred up to and beyond the boundary identified on the accompanying map.

The following digital spatial data sets were used for delineation: Real property parcel boundaries and streets, obtained from the City of Tacoma, in ARC/INFO format, digitized from original paper maps; St. Paul Waterway shoreline, topography, project boundaries, and physical plant, in AutoCAD format, obtained from the Simpson Tacoma Kraft Company; Commencement Bay Shoreline data set, originally digitized by the EPA Las Vegas Laboratory from NOAA charts into ARC/INFO format. Portions of these data layers were extracted and combined to create the data set containing the boundaries of the areas proposed for delisting.

PARTY REQUESTING DELETION:
Property Owner/Operator
Other Interest group
EPA

REASON FOR PARTIAL DELETION:
Contamination not found
Cleaned up

Partial Deletion Package Contents

1. Which of the following items has been provided in the partial deletion package?
2. Which locational data fields have been provided in both electronic and printout form?
3. NPL SITE COORDINATES: Coordinates of the entire site, in the form of polygons, starting with the northern-most coordinate and moving clockwise (in degrees, minutes, seconds, and thousandths of seconds). Coordinates are referenced to North American Datum (NAD) 1983.

4. DELETED PORTION COORDINATES: Coordinates of the deleted portion of the site, in the form of polygons, starting with the northern-most coordinate and moving clockwise (in degrees, minutes, seconds, and thousandths of seconds):
5. What method was used to identify the NPL site and deleted portion coordinates? NPL site coordinates were derived from information contained in the Record of Decision. The coordinates of deleted portions of the site were derived from existing digital parcel data and street data provided by the City of Tacoma, digital map data provided by Simpson Tacoma Kraft Company, and digital shoreline data digitized from NOAA nautical charts. Data extraction and manipulation was performed using ARC/INFO Geographic Information Systems software.

Dates

Date this Form Was Completed: 07/24/96
Date Partial Deletion Proposed in FR: 10/29/96
Date Partial Deletion Finalized in FR:


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