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0ENVI October 5,2004 Diana Christy,Esq. Frost Brown Todd LLC 2200 PNC Center 201 East Fifth Street Cincinnati,OH 45202-4182 Re: Evaluation of Charcoal Filter Media Dear Diana: At your request,ENVIRON has carefully evaluated the toxicity and ignitability of charcoal media from carbon filters used by LensCrafters at their stores. The toxicity test consisted of the hazardous waste LC50 screen test performed by Block Environmental Services Inc. of Pleasant Hill,California on samples of used and unused charcoal media from carbon filters obtained from a LensCrafters' store. Severn Trent Laboratories Inc, San Francisco,California,conducted the ignitability test on used and unused charcoal media from carbon filters obtained from LensCrafters' stores. The sample IDs for the used and unused charcoal media samples were 09272004-A and 09272004-B respectively. The results from the two tests are summarized below. Toxicity Test:The California Department of Toxic Substances Control has adopted regulations (R-45-78),which define criteria for the identification of hazardous wastes. These criteria are codified in Chapter 11,Article 3 of Title 22 of the California Code of Regulations. Toxicity to aquatic life, specifically fish, is one of the criteria used to gauge the hazardous potential of a waste. An acute 96-hour bioassay is used to determine the LC50 as defined in Section 66261.24(x)(6)of these regulations. This 96-hour LC50 value serves as the numerical indicator of the toxicity of a waste to aquatic life. The sample is deemed hazardous if the LC50 is less than 500 mg/L. Both samples tested(09272004-A and 09272004-B)passed the aquatic toxicity test,with LC50 values greater than 750 mgt,indicating the samples are not hazardous. 6001 Shellmound St.,Suite 700 Emeryville,California 94608-1954 USA Tel: (510)655-7400 Fax: (510)655-9517