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Home My WebLink AboutLtr re petroleum tank release - old PID# � ` �� , � � � � �-�-�— a��7� � _._.��.-`� �. �� , : � �`�'� � � r � � �- r�� T� �y� �� r�� M i n nes`ota Po! I ution Control Agency �� ,� �-,�f �. �.`� � � � ."J�1::R.:.i�:T �� ' .:�� f� .�=.:� _ _-_'___�� f � �_ __"_.__ . .. -� /"tI (4 �� !.+l._- � June 29, 1993 � `J l;N` 3 0 �� Mr. Don Morrison Sargent Hanagement Company 1300 TCF Tower Minneapolis, Minnesota 55402 Dear Mr. Morrison: . � RE: Petroleum Tank Release Site Closure Site: Estate of Elanor Pillsbury Site ID#: LEAK00005309 The Minnesota Pollution Control Agency (MPCA) Tanks and Spills (TS) staff has determined that the investigative and/or corrective actions performed in response to the petroleum tank release at the property referenced above (Site) has adequately addressed the petroleum contamination, and therefore the file regarding this release will be closed. Our determination is based upon the - data supplied in the "Remedial Investigation/Corrective Action Design" dated December 28, 1992. . On March 18, 1992, a petroleum tank release was reported to the MPCA. Since the discovery of the release, you have conducted the following investigative and corrective actions in response to the petroleum release: 1. A petroleum release was reported to the MPCA on March 18, 1992, when petroleum contamination was discovered during the excavation of a forears 540 gallon capacity leaded gasoline underground storage tank. It app that ths s�urce �f the petroleum contamination was from line leaks. 2. Soil samples collected below the former dispenser lines exhibited soil vapor �ar-headspace concentrations of 40 to 50 parts per million �PPm�'ards the time of the initial excavation activities, approximately 10 cubic y of contaminated soil was removed. Soil samples collected at the bottom of the excavation exhibited soil vapor jar-headspace concentrations of between 140 to 300 ppm. Soil samples collected for chemical analysis from the bottom of the excavation had detected total petroleum hydrocarbons as gasoline as high as 630 mg/kg. Water had entered the excavation and was reported to have a sheen present. A water sample was collected which detected petroleum constituents. MPCA Toli Frce 1-804-657-3864,Tdepiiw�e Dcvice for the Deaf(TDD)f+i2/297-5333.Greater Min�esote TDD 1-800-62�-3529 520 Lafayette Rd.; St. Paul, MN 55155-4194; (612) 296-6300; Regional Offices: Duluth• Brainerd•Detroit Lakes• Marshall• Roches4er ! ! � Mr. Don Morrison Page Z June 29, 1993 3. Five soil borings were conducted at the Site to determine the extent and magnitude of soil contamination. Soil samples were monitored for the presence of organic vapors with a photoionization detector. With the exception of samples collected between the depth of 1 to 3 feet below land surface, no organic vapor were detected which exceeded the background organic vapor concentrations. Three soil samples were collected for chemical analysis. Only low levels of petroleum constituents were detected. Water samples were collected from three of the borings as well, but the petroleum parameters analyzed for were not detected. 4. At the conclusion of the soil borings, additional soil excavation was conducted to remove some of the remaining contaminated soil. This additional excavation activity occurred on July 16, 1992. An additional 30 cubic yards of contaminated soil was removed and was later thermally treated along with the original 10 cubic yards of soil removed during March 1992. The highest soil sample exhibited a soil vapor jar-headspace concentration of 15 ppm. Soil samples collected for chemical analysis from the excavation were non-detect for the analyzed petroleum parameters. Water entered the excavation and two samples were collected for chemical analysis. Benzene, total benzene, ethyl benzene, xylene, toluene, and total petroleum hydrocarbons as gasoline were detected at concentrations of 160 ug/L, 404 ug/L, and 8.8 mg/L, respectively. Some contaminated soil remains beneath the concrete apron of the nearby garage. 5. A vapor risk assessment was conducted in the basement of the nearby utility room. No organic vapors were detected. Two water wells are located 25 and 125 feet from the former underground storage tank (UST). There are no logs for these wells, but the wells are reported to have been conducted to the depths of 250 and 300 feet below �land surface. The closer well was installed in 1969. A water sample was collected from the closer well, but none of the analyzed petroleum parameters were detected. 6. Based upon the observations and the results of the investigation, contaminated soil and ground water are limited to within 15 feet of the former UST. The majority of contaminated soil has been removed from the Site. The dissolved benzene concentrations detected in excavation water is below the ground water cleanup goal established for many sites (100 times the Recommended Allowable Limit). Based on the data provided by you in the report referenced above, we believe that these actions have adequately addressed the petroleum tank release. Therefore, MPCA staff does not intend to require any more investigation or cleanup work in response to this release. However, the MPCA reserves the right to reopen this file and require additional work if in the future more work is determined to be necessary. If you, or other parties, come upon any evidence of contamination other than what was previously reported, you are required by Minnesota law to notify the MPCA immediately. � � Mr. Don Morrison Page 3 June 29, 1993 The contents of this letter only refer to information reported to the MPCA TS staff for the activities described above. This letter does not release any party from liability for the petroleum contamination under Minn. Stat. 115C. (1992), or any other applicable state or federal law. This letter does not address other types of non-petroleum contamination that may be present at the subject property. Because you performed the requested work, the state may reimburse you for a major portion of your costs. The Petroleum Tank Release Cleanup Act establishes a fund which in certain circumstances provides partial reimbursement for petroleum tank release cleanup costs. This fund is administered by the Petro Board. More specific eligibility rules are available from the Petro Board (612/297-1119 or 612/297-4203). Thank you for your cooperation with the MPCA in responding to this petroleum tank release to protect the public health and the environment of the state of Minnesota. If you have any questions regarding this correspondence, please call me at 612/297-8589. Sincerely, � -� N-� � Richard Newquist Project Manager Tanks and Spills Section Hazardous Vaste Division RHN:nh cc: Robin Hanson, Department of Commerce, St. Paul Dorthy Hallin, City Clerk, Orono Pete Engebretson, Hennepin County Solid Waste Officer, Minneapolis Christopher Thompson, SEACOR, Minneapolis