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l <br /> 0 <br /> 2.5 Additional Soil and Groundwater Assessment <br /> The down gradient extent of the hydrocarbon impacted soil and groundwater has not been <br /> defined, therefore the San Joaquin County Public Health Services - Environmental Health <br /> Division (PHS/EHD) is requiring further assessment of the impacted soil and groundwater. <br /> 3.0 SCOPE OF WORK <br /> To continue the assessment of the impacted soil and groundwater at the site, additional <br /> monitoring wells will be drilled and installed. Initially, GeoAudit proposes to install two <br /> wells off-site. However, if impacted soil and groundwater are encountered, additional wells <br /> may be required. <br /> Two monitoring wells will be installed in the City of Stockton right-of-way. One monitoring <br /> well will be Iocated in the sidewalk immediately north of the building on-Site; the other <br /> monitoring well will be installed northwest of the property on Van Buren Street. Each <br /> boring will be drilled to a depth of approximately 55 feet and sampled at five-foot intervals. <br /> However, subsurface strictures may restrict the locations of monitoring wells in this area. <br /> The approximate locations of the proposed monitoring wells are illustrated in Figure 2. <br /> If the proposed drilling does not completely delineate the extent of impacted soil and <br /> groundwater at the site, additional wells will be installed. Proposed locations for additional <br /> wells will be submitted to the PHS/EHD for approval prior to drilling. <br /> 4.0 PROCEDURES <br /> To meet the project objectives, the following procedures Nvill be performed: <br /> 1) Prepare a Site Health and Safety Plan in accordance with the Occupational Safety <br /> and Health Guidance Manual for Hazardous Waste Site Activities - Prepared by <br /> National Institute for Occupational Safety and Health, Occupational Safety and <br /> Health Administration, U.S. Coast Guard and U.S. Environmental Protection <br /> Agency, October 1485. <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) Initially, a total of two (2) borings will be drilled. The borings will be drilled using <br /> a truck-mounted drill rig equipped with continuous-flight, 8-inch diameter hollow- <br /> stem augers. All borings will be drilled to depths of at least 55 feet. Each boring will <br /> be completed as a groundwater monitoring well (see figure 3). The proposed <br /> c.ose i A.d.,5-M...1— S <br /> SG 9+.05.973-3H/H• DAs <br /> uB.6101 A P <br />