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. Cwlogicaf?ecknics Inc �"'� �*� Page 5 Additional Site Characterization Work Plan Project No.724.2 July 7,20M L filling a VOA vial (provided by the laboratory) using the same procedures for actual sample collection. Bailer blanks for each sample, along with a field blank(prepared from water provided by the laboratory poured into a VOA vial on site),will accompany the samples to the laboratory and serve as checks against cross contamination. LA chain of custody document, listing all samples collected, accompanies the samples from field to laboratory, thereby providing a means to track their movement and insure their mtegnty All water purged from each monitoring well and not used as a sample,will be placed in a 55- gallon DOT approved container,properly labeled and stored on site. 2.3.1 Laboratory Analyses -Groundwater LA groundwater sample from well MW-104 will be submitted to Sherwood Laboratories of Hilmar(State Certified Laboratory#1400)and analyzed for the following: L • Benzene,toluene,ethylbenzene and xylene(BTEX)by EPA method 602 • Gasoline range petroleum hydrocarbons(TPH-G)by EPA method 5030/8015(m) • 1,2 DCA,ethanol,methanol,&oxygenated fuel compounds by method 8260 The detection limits for these compounds are listed below. A Chain of Custody will be completed for all samples collected and tracked to ensure sample integrity. LDetection Limits: BTEX TPH-G 1,2 DCA Ethanol Methanol TBAEthers Water(gg/L) 0.3 50 0.5 5 50 20 5 2.4 Receptor Well Survey e3' LA water well survey will be performed within a 2,000-foot radius of the former UST sites. The records at the California Department of Water Resources will be reviewed in order to find any well logs for domestic wells within 2,000 feet of the site. A physical search of the 2,000-foot radius area will also be performed to locate potential well receptors. The approximate location of identified wells will be marked on a map and included in the site characterization report. L 3.0 SCHEDULE &REPORTING Geological Technics Inc. anticipates beginning field work no later than 30 days after work plan approval and upon issuance of the drilling permit. The information gathered during this phase of work will be presented in a report which will include a summary of the geology as Lwell as the results of sample analyses. Dr. Ray Kablanow, a registered professional L