My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2020-221
CBCC
>
Official Documents
>
2020's
>
2020
>
2020-221
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
3/5/2021 12:35:28 PM
Creation date
10/20/2020 3:20:22 PM
Metadata
Fields
Template:
Official Documents
Official Document Type
Work Order
Approved Date
10/13/2020
Control Number
2020-221
Agenda Item Number
15.B.2.
Entity Name
Geosyntec Consultants, Inc.
Subject
CCNA2018 Work Order 8
Area
Engineering Services w/ 2020 Groundwater Technical Support Services
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
18
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
Mr. Himanshu H. Mehta, P.E. <br />25 September 2020 <br />Page 3 <br />Quarterly Assessment Water Quality Compliance Monitoring for the C&D Debris Disposal <br />Facility <br />Results of routine sampling of C&D debris disposal facility groundwater monitoring well (MW - <br />21 S) in January 2017 indicated exceedances of benzene and sodium GCTLs. As a result, SWDD <br />was requested by FDEP to initiate evaluation monitoring in accordance with subsection 62- <br />701.510(6), F.A.C. Pursuant to this request SWDD installed one groundwater monitoring well <br />(MW -49S) in July 2017. These and other wells (MW -21 S, MW -33S, MW -35S, MW -40S, MW - <br />49S, MW -50S, MW -51S, and MW -52S) and three surface water (SW) Lateral Canal (LC) <br />sample sites (SW -LCI, SW-LC2, and SW-LC3) have been sampled quarterly from July 2017 to <br />October 2019 under an evaluation monitoring program with FDEP. However, in correspondence <br />from FDEP to SWDD dated 14 October 2019, the FDEP approved SWDD's request to replace <br />the evaluation :monitoring of the eight groundwater wells and three surface water sample sites <br />with quarterly; assessment monitoring and with the addition of other parameters (arsenic, <br />benzene, naphthalene, and other semi -volatile organic compounds [VOCs]) to the suite of <br />parameters to be analyzed for at these wells. The FDEP also requested ,establishing background <br />water quality for seven (7) additional surface water sampling sites (LC4=SW to LC10-SW) along <br />the Lateral C canal. SWDD sampled and analyzed water -quality for these surface water sites in <br />the January and April 2020 quarterly water -quality assessment events. Following, the April <br />2020 quarterly; sampling event, FDEP approved (via e-mail on 17 July 2020) SWDD's request to <br />limit the monitoring of the surface water sites to SW -LCI, SW-LC2, SW-LC3 and SW-LC4. <br />Results of the quarterly sampling downgradient of the C&D debris disposal facility have <br />indicated persistent detections of ammonia, arsenic, sodium, iron, s TDS, TN and TP in <br />groundwater and persistent detections of ammonia, sodium, iron, TDS, TN and TP in surface <br />water sampling locations in the Lateral C Canal adjacent to the evaluation groundwater <br />monitoring locations. Geosyntec completed a site visit on 21 July 2020 as summarized in a 10 <br />August 2020 memorandum to SWDD. One of the objectives of the site visit was to visually <br />observe the site conditions on the east side of the C&D debris disposal facility and the Residuals <br />Dewatering Facility (RDF) relative to the current monitoring wells and surface water monitoring <br />locations. A stormwater management ditch located between the C&D debris disposal facility <br />and the RDF is suspected to be a potential source area for the persistent detections. A <br />supplemental groundwater assessment is recommended in this area to identify the lateral and <br />vertical extent of the groundwater impacts and to collect information to evaluate the remedial <br />alternatives including groundwater extraction via TreeWelle phytoremediation technology. The <br />information collected will be valuable with respect to other areas at the Site should additional <br />assessment be required. <br />NCP2020_3158/JL200925 2020 Compliance Monitoring Proposal <br />
The URL can be used to link to this page
Your browser does not support the video tag.