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Home My WebLink About11082021 City Council LAYDOWN - Public Wx PresentationCITY OF SEWARD SHOP CITY OF SEWARD SHOP PHASE I ESA AND LSI INVESTIGATION PROJECT OVERVIEW AND NEXT STEPS SITE MAP AND HISTORY Shop building constructed between 1964 and 1974 Petroleum handling practices changed drastically from 1964 to 2021 Generally, historic practices often result in environmental liability Seward may change property use or transfer/ sell the property PROJECT OVERVIEW Seward Public Works engaged R&M to investigate potential environmental liabilities associated with the existing City Shop (RES 2020-075) - Phase I Environmental Site Assessment - Limited Site Investigation (Phase II) -Performed concurrently PHASE I ENVIRONMENTAL SITE ASSESSMENT • SCOPE • Desktop records review, interviews, and site visit • Goal to identify possible Recognized Environmental Conditions (REC), if any • SOURCES • Aerial photographs, tax records, topographic maps, • FINDINGS (7 RECs IDENTIFIED) 1. Equipment maintenance and staining on the east side of the city shop also represent RECs for the Subject Property. 2. The former fuel island represents a REC for the Subject Property. 3. The 5,000-gallon diesel/gasoline aboveground storage tank (AST) represents a REC for the Subject Property. 4. The northeastern portion of the Subject Property is considered a REC due to transformers and other electrical equipment containing polychlorinated biphenyls (PCB) formerly stored on site and currently in use transformers present on site. 5. The 1,000-gallon diesel AST on the west side of the city shop represents a REC for the Subject Property. 6. One central floor drain present in the maintenance shop with unknown discharge represents a REC for the Subject Property. 7. Drums with unknown contents stored at the Subject Property represent a REC. This REC was not investigated as no evidence of releases were observed. The potential for releases from these containers resulted in listing as a REC. • RECs 1 through 6 were investigated by the Limited Site Investigation (Phase II) • REC 7 can be addressed by properly disposing of the drums on site LIMITED SITE ASSESSMENT — OVERVIEW • SCOPE • Investigate RECs from the Phase I ESA for impacts to the site • 18 AAC 75 Method Two cleanup levels • Methods • Soil borings to groundwater • Field screening • Soil sampling • Analytical testing • Gasoline -range organics (GRO) • Diesel -range organics (DRO) • Residual -range organics (RRO) • Volatile organic compounds (VOC) • Polycyclic aromatic hydrocarbons (PAH) • Polychlorinated Biphenyls (PCB) • Total metals (arsenic, barium, cadmium, chromium, lead, mercury, selenium, and silver) • Ethylene dibromide (1,2 dibromoethane [EDB]) • Results (EXCEED 18 AAC 75 CLEANUP LEVELS) • DRO (14,500 mg/kg max, 230 mg/kg cleanup level) • RRO (42,700 mg/kg max, 9,700 mg/kg cleanup level) • VOC (multiple analytes) • PAH (multiple analytes) Test Boring Location Sample Number' Depth (fleet bg,) GRO DRO I RRO tloanwp Level (""gft'' 260 230 9,700 COS2L-TH01-05 6to5 Co5,1-THo1 C0521-TH01-06 17 to 1' 5 COS21-TH02 C0521TH02-04 22to235 C0521-TH03 C0521-TH01 C0521-TH33-01 COS21-TH34-02 15 to 16 0to5 71.5J Not Analyzed CO521-TH05 COS -IL -TH05-03 0toa 1,260 J300 C0521.TH06 C0521-TH06-07 153 Mt 14,500 42,700 ML C0521-TW07-0^u 052 M1 12,000 37,000 QL �®moos®®�mo®mm®moo LSI - LOCATIONS • 5 Test Borings • Locations targeted to investigate presence/absence not to delineate extent • Sample frequency per hole based on investigation target • RECs 1 and 5 are hard to separate due to proximity Test Boring Location ` �`• 0 Hand Hole Location Investigation Area-- Mndison Street P u—d g G nd—ter Fbw D irection M4. Existing AST _ Location (REC 5) Former PCB Ca Transformer S�, City Shop � DEC(4) COS21 -TH06 (Fbor Drain Location, REC 6)C0521 -TH04 C0521 -THOI C0521-TH02 � StREC Soil ( REC C0511 -TH05 a � _ - Former Fuel I _ ^ Island Lacatbn 4 D (REC 2) y Location (REC 3) � '�, � �'W*•"'� ��ai+i+°�'f _ COS21 TH03� ng B tl storage Building { "�7' ALLLOCATIONS ARE APPROXIMATE NOTES: N1 0 25 50 100 Aerial imageryfmm Google Earth Pmfmm ApdI2011 ,L Investigation locations basetl on R&M fbld notes. APPROXIMATE SCALE IN FEET u^qy PHASE II LIMITED SITE INVESTIGATION PROJ.NO: 2734.11 paE?� CITY OF SEWARD SHOP DATE: OCT 2021 7YR&M `CON5tILiANT5, INC. INVESTIGATION LOCATIONS DRAWING NO.: A-03 4 iI • RECs 1, 5, and 6 are associated with soil contamination exceeding 18 AAC 75 cleanup levels • Release of petroleum products to the environment was reported to ADEC on 27 October 2021 • Additional investigation and remediation will be required �t p•� Detecmpk Reaulh Summary Client Semple lD' C0521-THpaL] Lap Sempe ID. 1214-007 Parameter Rew!lum _ Metals pyICVRAS m9M9 mgMq um Cnromium gAcq 8d9 mgikq 953 mgrvg u�`_ Poiynuclear nromavcs Gcmvs MemNaR�w�eneee -MamN�®qu�erem z mpMq 9Mg naaJ �taa gay - �y� { X II mmalalnn M1raene y 1nJ gnq ��. Ct rune 221J ugMq ^^ ' NB � .,� v. N 4 Pnerervn.ene BT6 rsMg �. ,yrrx . yw'F"'; 4 �.".i + - ...'- v,' Semivola4 eDrganc Fuels a'ez Range Orgvnm _ Re.Mua Range Organ o 6 w q 9 ugR te5pmghg d2T19 mgkg -•_ ^ • Cost Estimate and Proposal (In development) • Limited Source Removal • RECs 1 and 5 (Soil staining and AST) • REC 6 (Shop Drain) • Extent and Delineation Investigation • Groundwater Investigation NEXT STEPS — SITE WORK (CONCEPT) • Removal • Interior Drain • Soil Stain • Investigation • 5 Soil Test Borings • 3 Monitoring Wells S21-THOG i Location, REC 6) ;21 TI 102 Stained Sail pl-C 1) Former Fuel Island Location (RFC �,) Existing AST Location (REC 5) ` -- C:OS21 TI fO5 Former PCB Containing Transformer Storage Are (REC 4) 1 THD4 W1, �l TOR TIV� 't R ........... 4fr QUESTIONS.