3815_PGSF WMVD Pkg 2_Vol 4-2_03.03.2026_BXWA_Certified

ASPECT CONSULTING 34 FINAL PROJECT NO. AS190583A-08  MAY 21, 2025  REC 1: ExxonMobil/ADC Site, a portion of which is on the property (Everett Avenue easement). Prior independent remedial actions for this area are described in Section 3.1.8;  REC 2: Oil House and Gasoline/Bunker C Fuel Oil ASTs. Prior independent remedial actions for this area are described in Sections 3.1.6 and 3.1.8;  REC 3: Heavy Duty Shop Sump. Prior independent remedial actions for this area are described in Section 3.1.2;  REC 4: Rail Car Dumper Hydraulic System Building. Aspect is aware of no prior investigation activities for this area;  REC 5: Dutch Ovens 1 through 5. Prior independent remedial actions for this area are described in Section 3.1.13;  REC 6: Latex Spill Area. Prior independent remedial actions for this area are described in Section 3.1.12; and  REC 7: East Waterway. The East Waterway, which includes the In-Water Area of the Site, is outside of the Upland Area addressed in this RI/FS. The East Waterway will be addressed in its own RI/FS under a separate Agreed Order with Ecology. The Phase 1 ESA also identified six HRECs, which “in the past would have been considered a REC but may or may not be considered a REC currently.” The six identified HRECs are as follows:  HREC 1: UST Removals (UST Numbers 29, 67, 68, 68R, 69, 70, 70R, 71, 72, and 73). The ten USTs were removed and reported, including any detected releases, to Ecology. Ecology inactivated the LUST ID number for the mill property in 2002. There are reportedly no active USTs currently on the mill property (AECOM, 2011). Prior independent remedial action activities for these USTs are described in Sections 3.1.1, 3.1.3, 3.1.5, and 3.1.10. UST No. 70R was reportedly a 2,000-gallon diesel UST installed in 1989 (double-walled tank, cathodic protection, overflow sensor) in the same location as UST No. 70; it was decommissioned by removal in 1995 (AECOM, 2011);  HREC 2: Naval Reserve Property. Prior independent remedial actions for this area are described in Section 3.1.7;  HREC 3: Bleach Unit 2 (area of Bunker C fuel oil soil removal). Prior independent remedial actions for this area are described in Section 3.1.11;  HREC 4: PCB Transformer. Prior independent remedial actions for this area are described in Section 3.1.9;  HREC 5: Paint Shop. Prior independent remedial actions for this area are described in Section 3.1.4; and  HREC 6: Rail Car Dumper Containment Vault Valve. This area was defined based on a valve failure which allowed release of 2 gallons of hydraulic fluid to the East