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f S EC OR <br /> Ms. Victoria McCartney <br /> November 24, 2004 <br /> Page 4 <br /> Monitoring Well Surveying <br /> A California State Licensed Surveyor will survey the newly installed wells. The well casing <br /> will be surveyed to the nearest 0.01 feet in elevation relative to a known benchmark and <br /> located with respect to the California Coordinate System and latitude and longitude in <br /> degrees, minutes and seconds. <br /> TRACER TEST TANK TIGHTNESS TESTING <br /> The scope of work for this tracer test involves the installation of approximately eight tank <br /> probes, eight piping probes, and the sampling and analysis of the soil vapor collected from <br /> the soil vapor probes. <br /> Soil Vapor Probe Installation <br /> An estimated eight vertical tank soil vapor probes and eight piping probes will be installed at <br /> the"site.pTha robes will be constructed of %-inch poly vinyl chloride (PVC) piping. The <br /> depths of the tank probes will be between 1 and 12 feet bgs and the depth of the piping <br /> probes will be between 1.5 and 2 feet bgs. The total number and depth of the probes will <br /> be determined in the field. <br /> Tracer Injection and Sampling Analysis <br /> A unique chemical tracer will be added to each UST. After a period of 1 to 2 weeks, vapor <br /> samples will be collected from the soil vapor probes and analyzed for the presence of each <br /> UST-specific tracer. Detections of the individual tracers in specific probes will be used to <br /> identify a potential leak source. <br /> REPORT <br /> After completion of fieldwork and receipt of. laboratory data, a summary report will be <br /> prepared. The report will present boring logs, soil analytical data, chain-of-custody records, <br /> well construction details, a site map showing the monitoring well locations and probe <br /> locations, and conclusions and recommendations. <br /> SCHEDULE <br /> SECOR is prepared to initiate field work within 2 weeks following approval of this Work Plan <br /> by the County. A report documenting the findings of the investigation will be prepared and <br /> submitted approximately 8 to 10 weeks after the completion of the field work and receipt of <br /> laboratory analytical data. <br /> 1:\Chevron\91452\REPORTS\2004\monitoring well work plan 2004 rev_a.doc <br />