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3.0 GROUNDWATER DEPTH AND GRADIENT <br /> iThe depth to groundwater at the site has ranged from approximately 42 feet in November <br /> of 1992 to 37 feet in July of 1993. These fluctuations are due to seasonal effects and are <br /> common at most sites in San Joaquin County. <br /> The groundwater gradient at the site has rotated from N 41° W in November of 1992 to N <br /> 19° E in October of 1993. <br /> 4.0 SCOPE OF WORK <br /> On April 12, 1994, representatives of GeoAudit met with Mr. Harlin Knoll of the San <br /> Joaquin County Public Health Services - Environmental Health Division (PHS/EHD) to <br /> discuss alternatives for further site assessment to further define contamination in the vicinity <br /> of MW-1. <br /> It was determined that one soil boring be installed approximately five feet north of <br /> monitoring well MW-1 (see Figure 2).The boring will be drilled to a depth of approximately <br /> 40 feet (groundwater). However, if field screening indicates that petroleum hydrocarbons <br /> are present in soil samples, additional borings may be drilled to completely define the lateral <br /> extent of impacted soil. <br /> 5.0 PROCEDURES <br /> To meet the project objectives, the following procedures will be performed: <br /> 1) Prepare a site health and safety plan in accordance with the Occupational Safety and <br /> Health Guidance Manual for Hazardous Waste Site Activities-Prepared by National <br /> Institute for Occupational Safety and Health, Occupational Safety and Health <br /> Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, <br /> October 1985. <br /> 2) Notify the San Joaquin County Environmental Public Health Services - <br /> Environmental Health Division (PHS/EHD) 48 hours prior to commencement of any <br /> work. <br /> 3) Drill one boring approximately 5 feet north of monitoring well MW-1 using truck- <br /> mounted, continuous-flight, 8-inch diameter hollow-stem augers. The boring will be <br /> drilled to a depth of approximately 40 feet. The boring location is depicted on Figure <br /> 2. <br /> 4) Obtain soil samples at five-foot intervals using a split-tube sampler loaded with three <br /> Ckdq wl A.&s.mw,I.. A <br /> &%AAQVB7Un WM.ADD 4 <br />