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§eofogicaf7echnics inc. Page 4 <br /> Valentine(Eldorado 5t.) <br /> Work Plan Addendum <br /> Project No.723.2 <br /> January 13, 1999 <br /> \.nr <br /> Bailer blanks for each sample, along with a field blank (prepared from water provided by the <br /> laboratory poured into a VOA vial on site), will accompany the samples to the laboratory and <br /> serve as checks against cross contamination. <br /> A chain of custody document, listing all samples collected, accompanies the samples from <br /> field to laboratory, thereby providing a means to track their movement and insure their <br /> integrity. <br /> All water purged from each monitoring well and not used as a sample, will be placed in a 55 <br /> gallon DOT approved container, properly labeled and stored on site. <br /> Groundwater Sample Analyses <br /> One groundwater sample from each monitoring well will be submitted to Sherwood <br /> Laboratories of Hilmar(State Certified Laboratory #1400) and analyzed for benzene, toluene, <br /> ethylbenzene and xylene (BTEX) by EPA method 602, Gasoline range petroleum <br /> hydrocarbons (TPH-Gas) by EPA method 5030/8015(m) and the fuel oxygenates (MTBE, <br /> DIPE, ETBE, TAME & TBA) by EPA method 8260. <br /> The detection limits for these compounds are listed below. A Chain of Custody will be <br /> completed for all samples collected and tracked to ensure sample integrity. <br /> etectionLimits: BTEX Ethers- J TBA-8260 - aso ine <br /> ater �g U. <br /> Signature and Certification <br /> This project will be performed by Geological Technics Inc. in accordance with accepted <br /> geologic and hydrologic standards of the State of California accepted and in effect at the time <br /> of this investigation. Geological Technics Inc. is not responsible for undisclosed conditions. <br /> This work plan was prepared by: <br /> Michael J. Niemi <br /> Geologist QQ4pFE551p1��� <br /> 'c. 0 <br /> y4 R.}.Ki1NlANO�N M rp <br /> N0,.5234 <br /> Raynold L Kablanow II, Ph.D. * 3 •�� <br /> California <br /> ogist#5234 <br /> iforni Registered EnvmentalAssessor ssor#901 sr� f Ut►F�a�`P <br />