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Last modified
8/22/2023 2:18:14 PM
Creation date
2/3/2023 12:45:57 PM
Metadata
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Template:
Official Documents
Official Document Type
Work Order
Approved Date
01/17/2023
Control Number
2023-013
Agenda Item Number
15.B.4.
Entity Name
Geosyntec Consultants, Inc.
Subject
Work Order No. 19 for Annual Permit, 2023 Compliance Monitoring and Reporting
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Mr. Himanshu H. Mehta, P.E. <br />5 January 2023 <br />Page 3 <br />correspondence dated 14 October 2019 from FDEP to SWDD, the FDEP approved SWDD's <br />request to replace the evaluation monitoring of the eight groundwater wells and surface water <br />sample sites with quarterly assessment monitoring and with the addition of other parameters <br />(arsenic, benzene, naphthalene, and other semi -volatile organic compounds [VOCs]) to the suite <br />of parameters to be analyzed for at these wells. The FDEP also requested sampling of additional <br />surface water sites in the Lateral C Canal for the purpose of establishing background water - <br />quality conditions. Therefore, in 2020 Geosyntec working on behalf of SWDD sampled all <br />seven surface water sites except for April 2020 where the FDEP agreed to a reduction to three <br />locations. The reduction to three surface water sampling locations was approved for sampling <br />events and the total number of surface water sampling locations is assumed to be seven for the <br />2023 sampling events. In 2021, Geosyntec working on behalf of SWDD eliminated six surface <br />water sampling locations (SW-LC2, LC-SW5, LC-SW7, LC-SW8, LC-SW9 and LC-SW10) and <br />discontinued the sampling of MW -33S and MW -35S. Additionally, Geosyntec working on <br />behalf of SWDD in 2021 reduced the collection frequency of arsenic, benzene, naphthalene, 1 - <br />methylnaphthalene, 2 -methylnaphthalene, acenaphthene, and anthracene at MW -21S and MW - <br />49S from quarterly to semi-annual. Geosyntec will continue working with FDEP to further <br />reduced the surface and groundwater quarterly sampling scope at the C&D debris disposal <br />facility in 2023 in order to provide overall cost savings to the County. <br />Therefore, in addition to the semi-annual sampling of the C&D debris disposal facility <br />monitoring wells in January and July 2023, six wells and four surface water sample sites will <br />also be sampled in April and October 2023 as part of the 2023 compliance monitoring and <br />reporting program. <br />Quarterly Assessment Monitoring for the Class I Landfill <br />A comment letter from FDEP dated 6 May 2020 provided comments regarding the results of the <br />January 2020 Semi -Annual Water Quality Monitoring Report for the Class I landfill. FDEP <br />provided notification to SWDD to initiate evaluation monitoring at all monitoring wells with <br />detected exceedances above applicable groundwater cleanup target levels (GCTLs) for pH, <br />ammonia, chloride, sodium, total dissolved solids (TDS) and arsenic. Geosyntec provided a <br />response to comments (RTC) letter to the FDEP comment letter on 28 May 2020 which focused <br />on the long-term trends with the dataset available from the FDEP Water Assurance Compliance <br />System (WACS) database and requested a reduction of evaluation monitoring locations from 25 <br />locations (as originally requested by the FDEP in the 8 May 2020 letter) to four (4) locations <br />(specifically downgradient of MW -3S, MW -14S, MW -44S and MW -44I). FDEP approved this <br />request in a letter dated 14 August 2020 and the 90 -day evaluation monitoring period was <br />initiated on 17 September 2020 through a second RTC letter provided to FDEP. Geosyntec <br />installed the three (3) groundwater evaluation monitoring wells in November 2020 (evaluation <br />NCP2022_222465/X22076_2023 Compliance Monitoring Proposal <br />
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