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Ogden Environmental Services, Inc. June 1, 1988 <br /> William S. Rickman Page 2 <br /> 2. Soil samples will be field screened for volatile organics using a <br /> photoionization detector (PID) . Those samples collected above the <br /> water table that show positive readings of organic gases (>5 ppm) <br /> will be analyzed for total volatiles by the /4__P method fol-4 /alto, <br /> 3. Analyze groundwater samples for volatiles according to acceptable <br /> EPA methodology (EPA '$6th . <br /> 4. Survey the wells to determine the pre-dewatering hydraulic <br /> gradient. <br /> 5. Monitor groundwater levels in the newly constructed wells on a <br /> daily basis during dewatering activities. If the water level data <br /> indicate a reverse in the groundwater gradient the wells will be <br /> resampled for total volatiles by EPA method 6-. <br /> 6Z�18�.�{o <br /> Prior to initiation of this work, the Central Valley Regional Water <br /> Quality Control Board and the San Joaquin Local Health District must give <br /> approval of the assessment plan. Please call us if you have any questions or <br /> comments. <br /> Very truly yours, <br /> McCLELLAND ENGINEERS, INC. <br /> j 0"— • P� <br /> Thomas D. Matteucci <br /> Project Hydroge ogist <br /> \ W \A <br /> Thomas W. McNeilan, P.E. <br /> Engineering Manager <br /> TDM/TWM:dc <br /> cc: Gordon Lee Boggs (CVRWQCB) <br /> Laurie Cotilla (San Joquin Local Health District) <br /> Ca�,���e c��� o�. s iFe.. ►�. �O`T d�p-�•"�f � A r�o r� <br /> VDt�o, '� v►�0.a•.Q� <br /> [-Z-CL( <br /> bA <br /> McClelland <br />