Loading...
Correspondence - 4601 Shoreline Drive - 9/8/2026 t-rem-vic2-23 · LB 1682 · 8/17/26 September 3, 2026 VIA EMAIL Michael Piehler Parkshore Apartments MN, LLC 821 Raymond Ave, Ste 400 Saint Paul, MN 55114-1525 RE: Technical Assistance Letter: Completion of Soil Vapor Assessment Parkshore Apartments, 4601 Shoreline Drive, Spring Park MPCA Site ID: BF0003255 Billing ID: 266287 PINs: 18-117-23-33-0061, 18-117-23-33-0062, and 18-117-23-34-0247 Dear Michael Piehler: The Minnesota Pollution Control Agency (MPCA) staff in the Voluntary Investigation and Cleanup (VIC) Program has been requested to provide confirmation that the soil vapor assessment at the Parkshore Apartments site, at the location referenced above (the Site), has been successfully completed in accordance with MPCA’s Vapor Investigation and Mitigation Decision guidance document. The MPCA staff have reviewed the information submitted for the Site. The Site includes three parcels developed with three apartment buildings, two garage structures, a pool, and a pool equipment building. The Site was historically developed with a single-family residence until redevelopment with the existing apartment buildings in 1969 and 1984. Parkshore Apartments MN, LLC purchased the Site on December 19, 2025, and intends to continue leasing the existing apartment buildings to residential tenants. Twelve sub-slab soil vapor samples were collected at the Site (six in the northern apartment building and six in the southern apartment building) in December 2025 (heating season) and April 2026 (non- heating season). Tetrachloroethene (PCE) was detected in isolated sub-slab soil vapor samples at concentrations less than the MPCA action level of 33X the residential ISV (maximum concentration 34 micrograms per cubic meter). Trichloroethene (TCE) was detected in three sub-slab soil vapor samples at concentrations less than the residential ISV. Based on the two completed seasonal sampling events, the VIC Program concurs that the existing buildings at the Site do not require a vapor intrusion mitigation system. Four exterior soil vapor samples were collected at the Site in January 2026 (heating season) and April 2026 (non-heating season). Neither PCE nor TCE were detected in exterior soil vapor samples. Only 1,3- butadiene was detected in exterior soil vapor at a concentration greater than the MPCA action level of thirty-three times (33X) its residential intrusion screening value (ISV). 1,3-Butadiene is commonly found in soil vapor in urban environments due to its association with petroleum products, vehicle exhaust, and asphalt. It is unlikely that the 1,3-butadiene stems from a release of hazardous substances at the Site. Michael Piehler Page 2 September 3, 2026 Based on data available to date, the Site lies within the footprint of a larger vapor plume associated with the Marina Center site (BF0002298 and SA0001988), which is under evaluation with MPCA oversight. This determination is based on the recent soil vapor investigations completed at the Site, as described in the following reports prepared by Carlson McCain: • Supplemental Phase II Investigation Report, February 17, 2026 • Supplemental Soil Vapor Investigation Report, April 24, 2026 The building mitigation decision conveyed in this letter applies only to the existing residential buildings at the Site, as described in the reports listed above. This letter does not address any conclusions or representations regarding future structures or changes in land use at the Site, which may create new potential exposure pathways for soil vapor contaminants. The MPCA recommends that future construction activities at the Site (e.g., potential addition, new building, new utility trenches, etc.) be preceded by a soil vapor investigation within the footprint of the proposed construction area, so a vapor mitigation decision for the new feature can be made based on concurrent data. This letter does not address any conclusions or representations regarding soil or groundwater at the Site, or regarding petroleum-related VOCs that may have been detected in soil vapor. Petroleum contamination detected at the Site is under the oversight of the MPCA’s Petroleum Brownfield Program. Please be advised that the determination made in this letter is subject to the disclaimers found in Attachment A. If you have any questions about this letter, please contact Victoria Jolly, Project Manager, at 651-757-2098 or by email at victoria.jolly@state.mn.us. Sincerely, Amy K. Hadiaris This document has been electronically signed. Amy K. Hadiaris, P.G. Supervisor Voluntary Investigation and Cleanup Unit Remediation Division AKH/VRJ:df Attachment cc: Jamie Hoffman, City of Spring Lake (electronic) (w/attachment) Mary Finch, Hennepin County Environment and Energy (electronic) (w/attachment) John Lichter, Carlson McCain, Inc. (electronic) (w/attachment) Mary Nieting, MPCA Site Assessment (electronic) (w/attachment) Attachment A Page 1 of 1 Disclaimers Parkshore Apartments MPCA Site ID: BF0003255 1. Reservation of authorities The MPCA Commissioner reserves the authority to take any appropriate actions with respect to any release, threatened release, or other conditions at the Site. The MPCA Commissioner also reserves the authority to take such actions if the voluntary party does not proceed in the manner described in this letter or if actions taken or omitted by the voluntary party with respect to the Site contribute to any release or threatened release or create an imminent and substantial danger to public health and welfare. 2. No MPCA assumption of liability The MPCA, its Commissioner, and staff do not assume any liability for any release, threatened release, or other conditions at the Site or for any actions taken or omitted by the voluntary party with regard to the release, threatened release, or other conditions at the Site, whether the actions taken or omitted are in accordance with this letter or otherwise. 3. Letter based on current information All statements, conclusions, and representations in this letter are based upon information known to the MPCA Commissioner and staff at the time this letter was issued. The MPCA Commissioner and staff reserve the authority to modify or rescind any such statement, conclusion, or representation and to take any appropriate action under the Commissioner’s authority if the MPCA Commissioner or staff acquires information after issuance of this letter that provides a basis for such modification or action. 4. Disclaimer regarding use or development of the property The MPCA, its Commissioner, and staff do not warrant that the Site is suitable or appropriate for any particular use. 5. Disclaimer regarding investigative or response action at the property Nothing in this letter is intended to authorize any response action under Minn. Stat. section 115B.17, subd. 12. 6. This approval does not supplant any applicable state or local permits, ordinances, or other regulatory documents.