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July 06, 2018 <br />Mr. Randy Woodruff <br />City of Casselberry <br />95 Triplet Lake Drive <br />Casselberry, Florida 32707 <br />rwoodruffa�easselbet�,oi- <br />Florida Department of <br />Environmental Protection <br />Central District <br />3319 Maguire Boulevard, Suite 232 <br />Orlando, Florida 32803-3767 <br />Rick Scott <br />Governor <br />Carlos Lopez-Cantera <br />Lt. Governor <br />Noah Valenstein <br />Secretary <br />Seminole County - Waste Cleanup <br />City Center Site <br />4355 U.S. Highway 17-92 <br />Casselberry, Florida <br />WCU Site ID: COM 318134 <br />BF Site ID: BF590802002 <br />FDEP STCM ID: 59/8516519 <br />Review of May 7, 2018 "Results and Findinms of_Ouarteriv Post Active Remediation <br />Groundwater Monitoring" Report <br />Dear Mr. Woodruff. <br />The Department has reviewed the May 7, 2018 "Results and Findings of Quarterly Post Active <br />Remediation Groundwater Monitoring" Report, which was submitted on your behalf by Applied <br />Hydrogeologic Solutions, LLC on May 14, 2018 for the City Center Site referenced above, and finds it <br />acceptable as it relates to the information presented for the March 19, 2018 groundwater monitoring event <br />conducted at the site. However, based on the information provided in the Report, we have these additional <br />comments: <br />A recommendation was made to consider the site for closure under a Low -scored Site Initiative No <br />Further Action Order (LSSI NFA). On Page 8 of the Report, on the second bullet, it is stated that <br />"One (1) year ofpost active remediation groundwater monitoring has shown that the groundwater <br />plume is stable and limited to the area of well MW -13R. " We do not concur with this <br />recommendation at the moment. As mentioned on Page 7 in Section 3.0 of the Report, <br />ethylbenzene and naphthalene "...were detected at concentrations of 461Cg/L and 47 pg/L, <br />respectively, in groundwater collectedfrom well MW -13R. Comparison of'these results to those of <br />the prior quarter show that the concentrations of both analytes have increased in this well. " Due <br />to the detection of ethylbenzene above its corresponding Groundwater Cleanup Target Level <br />(GCTL) of 30 ltg/L and the increasing concentration of naphthalene in monitoring well MW -13R, <br />the Department does not concur that the groundwater contaminant plume is stable at the site. <br />Therefore, we recommend the continuation of groundwater monitoring for at least two additional <br />quarters at monitoring wells MW -13R and MW -22 to ensure that the groundwater contaminant <br />plume is stable and remaining within the property boundaries. The groundwater samples collected <br />