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Ogden Environmental Services, Inc. June 1, 1988 <br /> William S. Rickman I 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 }'�AP-;L method.6-L4 <br /> 3. Analyze groundwater samples for volatiles according to acceptable <br /> EPA methodology (EPA -ft, <br /> 61.1 fmq-o . <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 4)&4-5- <br /> 6-L.4-IU4o <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 /> Thomas D. Matteucci <br /> PPrro�je�ctnH�ydroge ogist <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 /> 6 . soy\ cu�,�J, a well dlor.o , W4 V)'M <br /> Co di e c i�� o Sik i^ <br /> 0.J 0�-1 I c'O J2 Cl, {a�) 'F^�. SRt•,Sa Q1.�d?L� L-Z CP J' I f ea'44 — <br /> � <br /> V1 Cl _ lY <br /> V :: McClelland <br />