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6-22-1998 1 : 14.PM FROM NFIC SACRAMENTO 916 858 2355 P 3 <br /> June 10, 1998 <br /> Page 3 <br /> for analysis. Groundwater samples will be analyzed for the presence of TPH-g, <br /> BTEX,and MtBE. <br /> PHASE THREE: Groundwater Monitoring Well Installation <br /> Utilizing information obtained from the phase two probeg Investigation, locations <br /> will be proposed for the groundwater monitoring well s, The proposed wells will monitor <br /> concentration levels of possible contaminants and determine groundwater gradient and <br /> directional flow. <br /> • Soil Sampling and Analysis. Soil samples will I e collected every five vertical feet <br /> from each boring. A maximum of two samples will be selected from each boring,one <br /> based on any elevated flame-ionization detector(FID)or photo-ionization detector, <br /> (PID)field results and one at the approximate locE tion of the soil/groundwater <br /> interface. !Selected soil samples will be submitted to a California State-certified <br /> laboratory and analyzed for the presence of TPH- ;BTEX,and MtBE. <br /> + Groundwater Well Development and Analysis. After well development,water y <br /> samples will be collected from the wells and sub itted to a California State-certified <br /> laboratory for analysis. Groundwater samples wil be analyzed for the presence of <br /> TPH-g,BTEX,and MtBE. <br /> + Well Surveying. Upon completion of well constrction and development,the wells <br /> will be surveyed by a licensed surveyor for elevation relative to mean sea level. <br /> Groundwater gradient will be interpreted utilizing wellhead elevations and depths to <br /> water. <br /> Report. A report will,be prepared after completion of necessary field work. The report <br /> will include boring logs,well location map,soil and groundwater hydrocarbon <br /> concentrations map,groundwater contour map,soil an I groundwater analytical results, <br /> and chain-of-custody documentation. <br /> I <br /> I <br /> 911-007.1 B/W RKP1,N <br />