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HomeMy WebLinkAboutPermit Approval 6/1/19980 COMMONWEALTH OF MASSACHUSETTS EXECUTIVE OFFICE OF ENVIRONMENTAL AFFAIRS DEPARTMENT OF ENVIRONMENTAL PROTECTION SOUTHEAST REGIONAL OFFICE ARGEO PAUL CELLUCCI TRUDY COXE Governor Secremry DAVID B. STRUHS Commissioner June 1, 1998 Mr. John Dagostino Town Manager Mansfield Board Of Selectmen Town Hall 50 West Street Mansfield, Massachusetts 02048 RE: PERMIT APPROVAL Application for: BWPSWII LANDFILL MAJOR MODIFICATION POST -CLOSURE MONITORING PLAN AT: Mansfield Landfill East St/Rte 1_06 Mansfield, MA Transmittal Number: 97779 Dear Mr. Dagostino: The Department of Environmental Protection, Solid Waste Management Section, (the "Department") has completed its Technical Review of the Landfill Major Modification permit application regarding the Post -Closure Monitoring Plan for the Mansfield town landfill (the "Landfill") located off East Street and determined that the application is Technically Complete. The Post Closure Monitoring Plan application (the "Application") was prepared by Camp, Dresser & McKee ("CDM") on behalf of the Town of Mansfield (the "Applicant") and submitted to the Department on November 21, 1995. The Application consisted of a Transmittal Form #97779, an application form BWP-SW-11, a cover letter dated October 27, 1995 and a "Plan" entitled: Town of Mansfield, Massachusetts Department of Public Works East Street Sanitary Landfill Site Plan August 1995 20 Riverside Drive • Lakeville, Massachusetts 02347 • FAX(508) 947-6557 • Telephone (508) 946-2700 -2- Background On September 21, 1990, the Department issued a Closure Permit Approval for the Landfill. Based on its review of a November 1991 Engineer's Certification Report, the Department issued a Landfill Closure Certification for the Landfill on April 12, 1994. This Certification required that the Town of Mansfield monitor and maintain the environmental monitoring system in accordance with Department regulations. Application Summary In response to the Department's requirement for environmental monitoring, the Application was submitted in October 1995 and proposed actions necessary to develop a monitoring program in accordance with 310 CMR 19.000. The proposed environmental monitoring program includes groundwater monitoring, surface water monitoring, landfill gas monitoring and site inspections. The Application states that one upgradient groundwater monitoring well currently exists and three down gradient monitoring locations have been selected. Each location will include a we11 couplet with one well screened in the top ten feet of the saturated zone and the bottom screen located just above till or bedrock. Wells will be installed in accordance with the Department's Publication #WSC-310-91 entitled "Standard References fer Monitoring Wells", dated April 1991. Two surface water sampling locations are proposed to be incorporated into the environmental monitoring program. One location is proposed in the Canoe River as it crosses East Street and is stated to represent conditions upstream of potential landfill influence. A second location is proposed where the Canoe River meets an unnamed stream running south of the landfill which is stated to represent conditions downstream of potential impacts from the landfill. The precise location of this sampling station is proposed to be determined during future field investigation. Surface and groundwater samples are proposed to be collected and analyzed semi-annually for the parameters listed in 310 CMR 19.132(1)(h) with results reported to the Department within 60 days. No landfill gas monitoring probes currently exist on site. The Application proposes to install landfill gas probes every 500 to 1000 feet along the perimeter of the landfill and monitor semi- annually for concentrations of explosive oases with a portable field instrument. The Application states that annual landfill inspections wit- be performed with the results included in bi-annual reports to the Department pursuant to 310 CMR 19.142(6). -3- Landfill Status On April 13, 1998, the Department and CDM inspected the Landfill and the surrounding areas to ascertain the existing conditions. In general the Landfill was maintained with little or no evidence of erosion and vegetative distress and limited required maintenance. It is anticipated that a report will be submitted to the Town of Mansfield and the Department based on the inspection identifying inspection results and maintenance actions to be taken. The Department will cite additional concerns, if any, based on review of the report. In addition, the Department has noted that the unnamed stream occasionally yields sufficient flow to be sampled and could be influenced by stormwater -runoff, leachate outbreaks or contaminated groundwater discharge from the landfill. This Approval will require sampling of the unnamed steam at two locations. Inspection of the unnamed stream revealed that the stream enters a heavily vegetated area just downstream of the Shell Oil easement and that locating a viable sampling location downstream of this easement may be difficult. Following the preliminary inspection with CDM, additional inspection revealed a wetlands area approximately 100 yards south of the unnamed stream and east of the easement which was highly discolored. This Approval will require that the source of discoloration be investigated to determine if it is natural in origin or the result of contamination from the landfill or other source. Approval The Department has reviewed the above -referenced permit application and hereby approves of the Post Closure Monitoring Plan subject to the following conditions: 1) Within 30 days of this Approval, a report based on the April 13, 1998 site inspection should be submitted to the Town and the Department identifying inspection results, required actions and an appropriate schedule for required actions. 2) Existing groundwater monitoring well MW-1 should be thoroughly inspected to determine that it is in proper condition to yield representative samples. Should the well be deemed unsuitable and unrepairable, the Applicant should review existing background data for compliance with 310 CMR 19.132(1)(c) and evaluate the need for a replacement upgradient well. If unsuitable for sampling, existing monitoring well MW-1 should be decommissioned. s= 3) Groundwater monitoring wells MW-20A, MW-20B, MW-19A and MW-19B should be installed at the approximate locations shown on the Plan. As discussed during the April 13, 1998 site inspection, groundwater monitoring wells MW-18A and MW-18B should be .located south of the proposed location in the most southerly accessible location. Every precaution should be taken to avoid the area of the Shell Oil Company pipeline. The Plan should be revised to indicate the final well locations. Wells should be installed in accordance with the Department's Publication #WSC-310-91 entitled "Standard References for Monitoring Wells", dated April 1991. The revised Plan, well boring logs and a schedule for commencement should be submitted to the Department for its records. a) The downstream surface water monitoring location in the Canoe River should be selected in the field and identified on a revised Plan. In addition, surface water sampling locations should be established on the unnamed stream with one sampling station located at the stream crossing at Ware Street and the second sampling station located at an accessible downstream of the Shell Oil easement. The unnamed stream locations should be sampled whenever the stream is flowing at both locations during regularly scheduled sampling events. 5) Inspection of the Landfill area revealed a wetlands area approximately 100 yards south of the unnamed stream and east of the easement which was highly discolored. The source of discoloration should be investigated to determine if it is natural in origin or the result of contamination from the landfill or other source. During the first scheduled sampling round, the Applicant should thoroughly inspect the area and collect and analyze a surface water sample. The results should be reported to the Department with an evaluation of the results, discussion of potential causes of the discoloration and recommendations for further action, if appropriate. Gi The Applicant shall perform environmental monitoring and maintain the environmental monitoring system in compliance with 310 CMR 118: Ground Water, Surface Water and Gas Monitoring Systems, 310 CMR 19.132: Environmental Monitoring requirements and 310 CMR 19.133: Maintenance of Environmental Control and Monitoring Systems. Surface and groundwater monitoring shall be performed semi- annually. 7; Pursuant to 310 CMR 19.132, all analytical results should be reported to the Department within GO days after the scheduled sampling period. Pursuant to 310 CMR 19, 132 (1) (i) , if the concentrations of any parameters exceed the state or federal drinking water standards or Maximum Contaminant Levels (MCL's) then the Department shall be notified within 14 days of the finding and re- -5- sampling performed within 60 days of the prior date of sample collection. If Secondary MCL's or Massachusetts Drinking Water Guidelines as listed in "Drinking Water Standards & Guidelines for Chemicals in Massachusetts Drinking Waters or Massachusetts Surface Water Standards (314 CMR 4.00) are exceeded, then the Department shall be notified within 14 days of the finding. The Department reserves the right to require re -sampling should exceedances of the standards or guidelines in this paragraph be exceeded. 8) The Application proposes to install landfill gas probes every 500 to 1000 feet along the perimeter of the landfill. Within 60 days of this Approval, a plan should be submitted to the Department indicating the aoproximate proposed locations of gas probes, a probe detail and surrounding land uses and water bodies, (ie streams, wetlands, etc.). The evaluation, spacing and construction guidelines contained in Chapter 4, Section IIIE of the May 1997, Landfill Technical Guidance Manual should be followed. Probes should be installed in accordance with the Department's approval of the plan. Upon approval and installation of the gas monitoring system, gas monitoring must be performed quarterly pursuant to 310 CMR 19.132 (40 (b) I until otherwise approved by the Department. 9) The Applicant should submit a report to the Department every two years summarizing the results of the environmental monitoring system. 10) The Applicant shall comply with the post closure requirements in 310 CMR 19.142(5) and the April 12, 1994 Landfill Closure Certification. The Department reserves the right to require additional assessment or action, including but not limited to modifying the scope or frequency of the environmental program and implementing appropriate corrective measures in order to maintain the environment free from objectionable nuisance conditions or threats to public health, safety or the environment. This Approval has been issued pursuant to M.G.L., Chapter ill, Section 150A. Any person or persons who are aggrieved by this action may appeal pursuant to Chapter 30A. An appeal must be commenced no later than thirty (30) days from the dace of this Approval. Notice of an action or proceeding to appeal shall be served on the Department upon the commencement of the Appeal. In the event of an Appeal, the Department -reserves the righcto reopen the permit proceedings, supplement the record and modify the permit. In addition, the Department reserves the right =o require additional assessment or action as deemed necessary in order to protect and maintain the environment free from objectionable nuisances, dangers and/or threats to public health. Erin Should you have any questions regarding the above points, or if you need additional information, please contact me at (508) 946- 2884 or Dan Connick at (508) 946-2833 or write to the letterhead address. Please refer to Transmittal #97779 in any correspondence to this office regarding this Approval. V U1 s i David B. E1__s, gh--'-- Solid Waste Management Section E/DG/re CC: Mansfield Town Board of Health Town Hall 50 West Street Mansfield, MA 02048 ATTN: Mr. Scott Liete Mansfield Town Engineer Town Hall 50 West Street Mansfield, MA 02048 ATTN: Mr. Lee Azinheira Camp Dresser & McKee 10 Cambridge Center Cambridge, MA 02142 ATTN: Mr. Richard Spieler DEP - Boston ATTN: J. Doucett