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Mr. William P. Schuler <br /> June 29, 1995 <br /> Page 2 <br /> Sierra-Pacific would deliver the Geo. F. Schuler, Inc. (GFS) water samples to Sequoia Analytical <br /> Laboratories, Inc., under chain-of-custody, to be analyzed for Total Purgeable Petroleum <br /> Hydrocarbons (TPPHC), quantified against gasoline with BTEX (benzene, toluene, ethyl-benzene, <br /> and xylene) distinction, by EPA Method 8015-Mod./8020, and Total Extractable Hydrocarbons <br /> (TEHC), quantified against diesel fuel, by EPA Method 8015. <br /> Under this proposed arrangement, you would be sent a copy of Sierra-Pacific's detailed quarterly <br /> monitoring report for the 1905 North Broadway Avenue site,with an addendum containing certified <br /> analytical data for the GFS water samples. That package of data should be sufficient to address <br /> the needs of SJCEHD. Unocal's water testing would enhance the data that you would otherwise <br /> collect. GFS would not be invoiced by Sierra-Pacific for mobilization, well monitoring, sampling, <br /> or report writing. Your company would be expected to pay analytical costs associated with <br /> petroleum hydrocarbon testing, and that amount would be about $154.00. <br /> If you prefer to have another laboratory perform the required analytical work, please let me know. <br /> I will release the GFS water samples to you after sampling. If you take ground water samples to <br /> another laboratory, you would assume responsibility for chain-of-custody, sampling protocols, and <br /> quality assurance. <br /> Please review the enclosed Unocal right-of-entry license agreement. If it meets with your approval, <br /> return the signed document to Sierra-Pacific for transmittal to Unocal for appropriate signatures. <br /> A counter-signed copy of the license agreement will be returned for your files. There is no hidden <br /> agenda. Please call if you have any questions. <br /> Sincerely, <br /> SIERRA-PACIFIC GROUNDWATER CONSULTANTS, INC. <br /> Joh ephen Ra , CEG-1133 <br /> Senior Engineering Geologist <br /> JSR/cf <br /> CC. W.T. Nickerson, Unocal <br /> Wendy Wyels, Central Valley - Regional Water Quality Control Board <br /> Michael Infurna, San Joaquin County Environmental Health Department <br /> ,5-y. i whi TK'u �- : Y • ar' S k' <br /> i <br />