Florida Department of Environmental Protection Industrial Wastewater Permitting, Southeast District 3301 Gun Club Road, MSC 7210-1 West Palm Beach, Florida 33406
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APTIM 5725 NW 159th Street Miami Lakes, Florida 33014 www.APTIM.com April 30, 2019 Florida Department of Environmental Protection Industrial Wastewater Permitting, Southeast District 3301 Gun Club Road, MSC 7210-1 West Palm Beach, Florida 33406 Subject: NPDES Generic Permit – Best Management Practices and Monitoring Plan Dewatering for Underground Storage Tank, Canopy Footer, and Sanitary Sewer and Exfiltration Trench Installation Activities Wawa Store No. 5362 2505 West Woolbright Road Boynton Beach, Palm Beach County, Florida 33426 To Whom It May Concern: Aptim Environmental and Infrastructure, LLC. (APTIM), on behalf of Wawa Florida, LLC. (Wawa), is submitting this Best Management Practices (BMPs) Plan to the Florida Department of Environmental Protection (FDEP) for the above referenced facility in order to meet the requirements for coverage under the Generic Permit For Discharge Of Ground Water From Dewatering Operations, DEP Document 62- 621.300(2)(a), effective February 2015 (Generic Permit). APTIM has authorization to request permits on behalf of Wawa. The Limited Authorization Letter is included as Attachment A. The requested permit should be issued to: Mr. Mark Hamilton Real Estate Manager 7022 TPC Drive, Suite 200 Orlando, Florida 32822 [email protected] Background The Subject Property is identified as Parcel ID Numbers 08-43-45-32-00-000-3080 and 08-43-45-32-00- 000-3050 on the Palm Beach County Property Appraiser website. The facility lies within Section 32 of Township 45 South and Range 43 East, at latitude 26º 30’ 49.20” N and longitude 80º 05’ 22.90” W. An Aerial Site Location Map is included as Figure 1. Wawa is planning to develop the site, owned by BW Woolbright Congress, LLC., in July 2019. Depending on the water table elevation at the time of site development, it is anticipated dewatering will be needed during the installation of the underground storage tanks (USTs), fuel dispenser sumps, product piping, canopy footers, and sanitary sewer and exfiltration trench installations, as shown on Figure 1. A National Florida Department of Environmental Protection April 30, 2019 Page 2 Pollutant Discharge Elimination System (NPDES) Permit is required for the discharge of groundwater from the dewatering operation(s) during the development of the site. Dewatering is expected to occur within 90 days of receipt of all required permits and will last for up to approximately 10 consecutive days for the installation of the USTs, up to approximately 20 consecutive days for the installation of the fuel dispenser sumps, product piping, and canopy footers, and up to approximately 10 consecutive days for the sanitary sewer and exfiltration trench installations. The total days of dewatering are not anticipated to exceed 40 non-consecutive days. The dewatering operation will be online for 24 hours per day, per dewatering event. The groundwater will be discharged to the Palm Beach County storm drain located on West Woolbright Road, as shown on Figure 1. An alternate discharge location would be the Palm Beach County storm drain located on South Congress Avenue (Figure 1). Contaminated Sites within 500 Feet or Induced Influence Area The subject property has no documented discharges; however, there are two facilities with open discharges located within 500 ft of the subject site. The site location with a 500 ft radius is shown on Figure 2 and information for the sites is summarized in the following table: FDEP Distance from Contaminant Contaminated Site Facility ID Dewatering Location to Type No. Contaminated Plume Marathon Woolbright #613 1610 South Congress Avenue, 50/9502819 Petroleum 230 ft Palm Beach County 7-Eleven Store No. 34790 2605 SW 15th Avenue, 50/8520561 Petroleum 355 ft Palm Beach County • Marathon Woolbright #613 (FDEP Facility No. 50/9502819) is located at 1610 South Congress Avenue, Boynton Beach, Florida. The facility has one open discharge. The Discharge Reporting Form (DRF), dated December 21, 1998, was filed based on contaminated groundwater discovered via monitoring well sampling. The Discharge was eligible for funding by the Florida Department of Environmental Protection (FDEP) Petroleum Restoration Program and received a site score of 30. The 1998 DRF and the most recent groundwater analytical data are included in Attachment B. • 7-Eleven Store No. 34790 (FDEP Facility No. 50/8520561) is located at 2605 SW 15th Avenue, Boynton Beach, Florida. The facility has five closed discharges and two open discharges. A DRF was filed December 15, 1988, following the detection of petroleum contaminants in monitoring wells. The 1988 discharge was granted No Further Action (NFA) approval on August 12, 1991. An October 30, 1995, DRF was filed following the discovery of petroleum contaminants in compliance wells. The discharge was granted NFA status on July 1, 1996. A DRF was filed on January 25, 1996 due to the detection of petroleum contaminants in monitoring wells. This discharge was eligible for funding by the Florida Petroleum Liability and Restoration Insurance Program (FPLRIP). On April 1, 1997, a DRF was filed following the discovery of used oil in a Florida Department of Environmental Protection April 30, 2019 Page 3 compliance monitoring well. The discharge was eligible for funding by FPLRIP. On November 5, 2001, a DRF was filed following a gasoline spill. The discharge was granted NFA status on August 14, 2002. A DRF was filed on August 20, 2003 following another gasoline spill. The discharge was granted an SRCO on October 8, 2007. On April 21, 2007, a DRF was filed following the detection of petroleum contaminants via soil sampling. The discharge was granted an SRCO on July 15, 2010. The 1988, 1995, 1996, 1997, 2001, 2003, and 2007 Discharge Reporting Forms and applicable discharge closure documents are included in Attachment B. The most recent groundwater analytical data was included in a Remedial Action Interim Report written by Groundwater & Environmental Services, Inc. (GES), in September 2018. The report concluded that petroleum contamination across the site was below the respective Groundwater Cleanup Target Levels (GCTLs) in all monitoring wells for two consecutive quarters. Therefore, GES recommended that a Site Rehabilitation Completion Order (SRCO) be issued for the open 1996 discharge. The groundwater analytical data from the 2018 Remedial Action Interim Report is included in Attachment B. As calculated on Table 1a, 1b, and 1c using Sichardt’s equation, Marathon Woolbright #613 is located within the equivalent radius of influence (ROI) for short-term dewatering for UST installation activities (513.7 ft), the product piping, dispenser sump, and canopy footer installation activities (188.9 ft), and the sanitary sewer and exfiltration trench installation activities (151.6 ft). Therefore, APTIM performed groundwater monitoring using Analytic Aquifer Simulator (AnAqSim) to evaluate the effect of dewatering for the UST, product piping, dispenser sump, canopy footer, and sanitary sewer and exfiltration trench installations on the Marathon Woolbright #613 site. The most recent groundwater analytical data for 7- Eleven Store No. 34790 concluded that the petroleum contamination across the site was below the respective GCTLs, therefore, 7-Eleven Store No. 34790 was not considered in the groundwater model. Groundwater Modeling Software Information APTIM selected AnAqSim groundwater modeling program as this program is well respected in the industry and from regulatory agencies. AnAqSim was created by Fitts Geosolutions, LLC as an analytic element software designed to simulate groundwater flow under various conditions, including in steady state or in a transient condition. The software can be used in a two-dimensional model that can also stack domains to create a three-dimensional model. It is meant to be a robust yet simplistic model that allows evaluation for injection or extraction functions in an unconfined or confined aquifer. APTIM believes this model is a good fit to evaluate the impact of short term dewatering on adjacent sites without performing a rigorous modeling effort using more complex finite element methods software. Documentation on AnAqSim is attached in Attachment C and additional information can be located on the website: http://www.fittsgeosolutions.com/. Groundwater Modeling Results The base map for groundwater modeling of this site used the ACAD drawing developed for site construction by the respective engineer/architect, which was converted to a .dxf version for modeling purposes. Specific aquifer characteristics used in the AnAqSim model were taken from assessment/remedial reports developed for the subject site and nearby sites since a complete Florida Department of Environmental Protection April 30, 2019 Page 4 assessment has not been performed at the subject site. The model was executed to simulate current static conditions with the estimated gradient, flow direction, and the groundwater elevation set to an arbitrary vertical datum. The model was then executed using a set constant elevation head in the proposed UST area to simulate tank installation dewatering for a period of 10 days for the tank pit, 20 days for the product piping, dispenser sumps, and canopy footers, and 10 days for the sanitary sewer and exfiltration trench installations. Based on the model results, the Marathon Woolbright #613 site is within the area of groundwater depression created by dewatering at the subject site. APTIM inserted particle tracking at Marathon Woolbright #613 in the contaminant source area