Tetra Tech EM Inc.
Personnel: Greg Young
Reporting Period: July 8 through 10, 2002

INTRODUCTION

As requested by the U.S. Environmental Protection Agency (EPA) under Contract No. 68-W6-0037, Work Assignment No. 941-RSBD-0529, Tetra Tech EM Inc. (Tetra Tech) is conducting site visits and performing oversight activities at the Lemon Lane Landfill site in Bloomington, Indiana. Viacom, Inc. (Viacom), is the responsible party for the site, and PSARA Technologies, Inc. (PSARA), is Viacom's contractor. Viacom is conducting ongoing investigations, including dye trace tests, to gain a better understanding of groundwater flow patterns and polychlorinated biphenyls (PCB) transport to Illinois Central Spring (ICS) near the site. The purpose of the dye trace test conducted in July 2002 was to evaluate whether groundwater in the vicinity of monitoring wells MW-6 and MW-21 follows similar or differing flow paths to ICS.

This report summarizes activities observed by Tetra Tech at the Lemon Lane Landfill site from July 8 through 10, 2002; issues and developments; and future activities at the site. Appendix A contains a photographic log of field activities, Appendix B contains a copy of Tetra Tech's field notes, and Appendix C contains a site map. The attachment contains a copy of Viacom's scope of work for the dye trace test.

ACTIVITIES AND OBSERVATIONS

Tetra Tech's activities and observations at the Lemon Lane Landfill site from July 8 through 10, 2002, are summarized below.

Monday, July 8, 2002

Tetra Tech arrived at the site at 12:45 p.m. PSARA was at the site preparing wells for dye injection. PSARA reported that the dye trace test would be conducted on Tuesday, July 9, at 9:00 a.m. PSARA also reported that monitoring well MW-21 (which is located at the east edge of the site) could not be reported that it would collect samples from the injection wells and several surrounding wells later in the evening and then twice daily from Thursday, July 11, until the end of the test. Tetra Tech left the site at 1:30 p.m.

ISSUES AND DEVELOPMENTS

Because of an obstruction in monitoring well MW-21, Viacom instead used MW-4i for the dye trace test. This change in plans is not expected to affect the significance of the test results. The two wells are located within 10 feet of each other and are both completed in the phreatic (water-bearing) zone. Pumping tests conducted by Viacom in 2001 showed that the phreatic zone is hydraulically connected along the east perimeter of the site.

The activities conducted by Viacom were observed to be consistent with the scope of work submitted by Viacom (see the attachment) prior to conducting the dye trace test. The scope of work also contained several post-dye injection components that Tetra Tech did not oversee. These components included the ICS sampling, the sampling of the injection wells and other wells in the vicinity of MOO-6 and MW-4i, and sampling of the nearby Quarry and Slaughterhouse Springs.

On Thursday, July 18, 2002, Mike McCann of Viacom reported by telephone that Rhodamine WT dye had been detected at ICS about 28 hours after the dye's injection into MW-4i but that no Fluorescein dye had been detected at ICS to date. The travel time of the Rhodamine WT dye from MW-4i to ICS was consistent with Viacom's estimate, which was based on ICS's flow rate and the distance to ICS. Also, the report that the Fluorescein dye had not yet reached ICS suggests that water in the vicinity of MW-6 in Valhalla Cemetery is not on a direct flow path to ICS. Mr. McCann stated that Viacom would issue a formal report once the Fluorescein dye was detected at ICS.

FUTURE ACTIVITIES