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HSW Engineering
Green Initiative
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HSW Green Initiative

Environmental Engineering


HSW has provided environmental engineering services to the City of Ocala for more than 15 years, beginning in 1999, soon after the City was awarded a Brownfield Grant in 1998 and created the RENEW OCALA office to manage its brownfields program. A cost‐saving cooperative program was created whereby City personnel conducted a significant portion of the Phase I ESAs and then HSW performed Phase II activities, as needed. These measures help to extend grant monies and additional properties. More than 15 Phase I ESAs were performed in accordance with ASTM Standard 1527, as amended, for various prioritized market ‐ready properties located in the Community Redevelopment Area (CRA) through the heart of downtown Ocala. Of the properties where Phase I ESAs were performed, Phase II ESAs were conducted at nine (9) sites. As requested, HSW also explained the findings and any recommendations (including estimated costs to perform additional site rehabilitation activities) with identified stakeholders.

In addition, HSW was retained by the City to complete site assessment activities at a former public works facility currently owned by Interfaith Emergency Services, Inc. Using the information generated during previous investigations, HSW first negotiated with the FDEP to reduce the number of deep monitor wells requested to complete the site assessment. Then upon completing a pilot study to evaluate site conditions, HSW prepared and implemented a cost effective and aggressive remedial action plan consisting of insitu air sparging and soil vacuum extraction to remediate a localized area of dissolved chlorinated solvents in the shallow groundwater system. The selected remedial action reduced dissolved VOC concentrations in the source area by more than 95% to below the natural attenuation default criteria cited in Chapter 62 ‐777, FAC. Once these levels were achieved (approximately 2 years) in the surficial aquifer, site cleanup efforts were shifted from active remediation to a passive monitored natural attenuation approach. HSW prepared construction and bid specifications to facilitate bidding, performed construction oversight, and startup testing, and all operation, maintenance, monitoring and reporting activities.

HSW recently prepared a remediation technology screening matrix to help the City select a remedy to complete site rehabilitation. Based on this analysis, No Further Actions with Institutional Controls (groundwater use restrictions) was determined to be the preferred alternative and HSW is currently working with the City, regulatory agency, and property owner to implement this approach. Once completed, this alternative will result in significant savings in both time and money to close this site.