Bita Tabatabai, P.E., Principal

btabatabai@irisenv.com, (949) 724-8900 ext. 17, Download Vcard

Ms. Tabatabai is a Principal at RPS Iris Environmental. She has more than 25 years of experience with soil and groundwater investigation and remediation issues.

She has routinely been involved in the preparation of work plans, cost estimates, remedial investigations/feasibility studies, pilot tests, permitting, design, installation, construction management, operation and maintenance of remediation systems, site closures, and regulatory compliance consultation.

Representative Project Experience

Site Subsurface Investigations

At an electronic manufacturing facility in Irvine, California with elevated concentrations of trichloroethene (TCE) in groundwater, Ms. Tabatabai designed a cone penetrometer testing/membrane interphase probe (CPT/MIP) investigation to better define the lithologic units underlying the site, particularly in the vicinity of observed high TCE concentrations, and to assess relative volatile organic compound (VOC) concentrations in this same general area.

Elevated concentrations of VOCs were observed during the CPT/MIP investigation, which was followed with collection of confirmatory soil and groundwater samples, yielding good correlation. As a result of the CPT/MIP investigation, we were able to define the area and depth of elevated TCE concentrations and potential dense non-aqueous phase liquid (DNAPL) in the saturated zone, thereby allowing for design of an aggressive remedial strategy that included excavation and removal of TCE-impacted soils and use of permanganate (solid and liquid) to treat the residual contamination.

Approximately 13,000 cubic yards of soil was excavated to a total depth of 33 feet below ground surface (approximately 20 feet below the static ground water level). Solid permanganate (potassium permanganate) mixed with sand was placed at the floor of the dewatered excavation at 30-foot depth and liquid permanganate (sodium permanganate) was injected down-gradient of the excavation for treatment of residual concentrations of VOCs. The site, which had ground water TCE concentrations as high as 30,000 micrograms per liter (µg/l) in 2004, was closed in May 2006.

Site Remediation

At a former manufacturing site in Irvine, California, where ground water was impacted with VOCs and carbon tetrachloride, Hydrogen Release Compound (HRCx) was initially used for treatment of groundwater. One year after HRCx application, VOC concentrations in groundwater was not reduced as expected.

Ms. Tabatabai in conjunction with a treatablility study laboratory, performed a treatability study for sodium persulfate injection, and determined the optimal injection concentrations. An in situ pilot test was performed in April and May 2006 in anticipation of full-scale application of this treatment technology.

Designed, implemented and obtained closure for a remediation system at a financial institution in La Palma, California impacted with petroleum hydrocarbons. The remediation design consisted of a 2-PHASETM Extraction unit in conjunction with a thermal/catalytic oxidizer for the treatment of the extracted vapors and granular activated carbon (GAC) for the treatment of the extracted ground water.

After six months of operation the ground water concentrations were below drinking water standards. The regulatory agency issued a “No Further Action” letter and the site was closed. The results of the remediation at this site was demonstrated at the Contaminated Soils Seminar through a poster presentation at the University of Massachusetts in Amherst.

Education

M.S., Civil Engineering, University of California, Irvine. 1989.
B.S., Agricultural Engineering, California Polytechnical State University, San Luis Obispo, California. 1981.