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C Mr. Jim La Porte December 15, 2008 Page 2 Sample Results Results of the analyses detected TPH-D in the samples from the M Street and 20`h Street facilities at concentrations of 150 micrograms per liter (ug/L) and 5,200 ug/L, respectively. Various SVOCs were also detected in the sample from the M Street facility at concentrations ranging from 0.60 ug/L (methyl -t -butyl ether) to 14 ug/L (t -butyl alcohol). SVOCs were not detected in the sample collected from the 201h Street facility. No VOCs were detected in any of the samples. The results of the RCI analyses indicated that both samples were not reactive to cyanide or sulfide, and non -ignitable up to 100°C. The pH of both samples were also within the neutral range (7.73 to 7.67). The results from the 96 -hour fish bioassay determined both samples to have a mortality of less than 40% at a concentration of 750 mg/L. A summary of the results are presented in Table 1, with copies of the laboratory reports included in Attachment 1. The Title 22 CAM / CCR metals detected in both samples consisted of barium up to 20 ug/L, cadmium up to 3.9 ug/L, cobalt up to 18 ug/L, copper up to 14 ug/L, lead up to 5.3 ug/L, molybdenum up to 4.2 ug/L, nickel up to 9.6 ug/L, and zinc up to 130 ug/L. None of these concentrations exceeded the CCR Title 22 regulations for classification as hazardous waste. Analytical results are summarized in Table 2, with copies of the laboratory reports included in Attachment 1. Discussion No VOC or SVOC compounds were detected at concentrations that exceeded State of California's guidelines for classification of hazardous waste in accordance with Section 66261.24 of CCR Title 22. Results of the RCI analysis also indicated that the sump water was non -hazardous in accordance with Sections 66261.21, 22, and 23. The Title 22 CAM / CCR metals detected in the samples were found at concentrations below the Soluble Threshold Limit Concentration (STLC) levels for classification as hazardous waste as listed in Section 66261.24. The results from the Title 22 96 hr fish bioassay determined both sump water samples have a mortality of less than 40% at a concentration of 750 mg/L. Raw survival count numbers from the test indicate 0% mortality. Greater than 50% mortality was not reached at any concentration for any test resulting in a "non -hazardous" determination. Based on these results, the drummed sump water can be classified as non -hazardous. Shaw appreciates the opportunity to be of continued service to AT&T. If you have any questions, please do not hesitate to call me at (925) 288-2103. Sincerely, Shaw Environmental, Inc. Rob Delnagro Project Manager 0:\AT&T\08-0064.doc