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also shows achievement of less than 15 mg/l TPH for grab samples. Filterra° provided <br />limited visible sheen data due to access limitations at the outlet monitoring location. <br />9. The field data showed low percentage removals of total phosphorus at all storm flows at <br />an average influent concentration of 0.189 mg/1 (average effluent concentration of 0.171 <br />mg/1). We may relate the relatively poor treatment performance of the Filterrav system at <br />this location to influent characteristics for total phosphorus that are unique to the Port of <br />Tacoma site. It appears that the Filterrav system will not meet the 50 percent removal <br />performance goal when you expect the majority of phosphorus in the runoff to be in the <br />dissolved form. <br />Laboratory Testing <br />1. Filterra° performed laboratory testing on a scaled down version of the Filterrav unit. The <br />lab data showed an average removal from 83-91% for TSS with influents ranging from <br />21 to 320 mg/L, 82-84% for total copper with influents ranging from 0.94 to 2.3 mg/L, <br />and 50-61% for orthophosphate with influents ranging from 2.46 to 14.37 mg/L. <br />2. Filterrav conducted permeability tests on the soil media. <br />3. Lab scale testing using Sil-Co-Sil 106 showed percent removals ranging from 70.1% to <br />95.5% with a median percent removal of 90.7%, for influent concentrations ranging from <br />8.3 to 260 mg/L. Filterrav ran these laboratory tests at an infiltration rate of 50 in/hr. <br />4. Supplemental lab testing conducted in September 2009 using Sil-Co-Sil 106 showed an <br />average percent removal of 90.6%. These laboratory tests were run at infiltration rates <br />ranging from 25 to 150 in/hr for influent concentrations ranging from 41.6 to 252.5 mg/l. <br />Regression analysis results indicate that the Filterrae system's TSS removal performance <br />is independent of influent concentration in the concentration rage evaluated at hydraulic <br />loading rates of up to 150 in/hr. <br />Contact Information: <br />Applicant: Jeremiah Lehman <br />Contech Engineered Solutions, LLC. <br />11815 Glenn Widing Dr <br />Portland, OR 97220 <br />(503) 258-3136 <br />j lehmankconteches.com <br />Applicant's Website: http://www.conteches.com <br />Ecology web link: hqp://www.ecy.wa.gov/2rojzrams/wq/stormwater/newtech/index.html <br />Ecology: Douglas C. Howie, P.E. <br />Department of Ecology <br />Water Quality Program <br />(360) 407-6444 <br />douglas.howickecy.wa. ov <br />