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Site Investigation Work Plan - 2 - 15 March 1999 <br /> Army National Guard Facility Stockton <br /> Work Plan should be submitted, for our review and concurrence, to investigate the sewer line <br /> deficiencies. The Sewer Line Investigation Work Plan should include maps showing the location of <br /> laterals, sumps (i.e. discharge points) and deficiencies. Investigation activities should provide (boring) <br /> soil sampling locations near the sewer line breaks and potential discharge points. The approach for <br /> developing an appropriate number of sewer line sampling locations could be based on how severe the <br /> deficiency (sewer line breaks or cracks) is and could be based on the location with respect to potential- <br /> discharge points. <br /> Additional Areas of Concern (AASF) <br /> 2. Hazardous Materials Storage Sheds (near spill kit -Figure 3 of Work Plan) <br /> Several hazardous waste storage sheds are located adjacent to an unpaved strip of land that borders the <br /> southern perimeter of the AASF. Inspection of unpaved strips of land near the hazardous waste sheds <br /> revealed the presence of several empty and unmarked » gallon drums. Adjacent to the storage sheds is <br /> a former paint spray booth which is now used as an emergency rinse area. The paint spray booth <br /> appeared to be in good condition. However, the unpaved area immediately south of the paint spray <br /> booth also had drums stored on it. These unpaved areas (behind the hazardous waste shed and the paint <br /> spray booth) should be investigated for any potential contaminants of concern that have been stored in <br /> this area in the past or present. A records search should be performed to determine potential <br /> contaminants of concern and a sampling and analysis plan should be provided for this area. <br /> Additional Areas of Concern (CSMS) <br /> 3. "Old" Hazardous Material Storage Area adjacent to Washrack (to sanitary sewer) <br /> Based on our site visit, it was mentioned to us (informally) that the existing (new)Hazardous Materials <br /> Storage Area, located north of the New Shop Building 3 and directly west of the washrack (and <br /> connected to the sanitary sewer) may, in the past, have experienced uncontained hazardous waste spills. <br /> These spills may have occurred prior to the construction of spill containment structures that are now part <br /> of the (new) Hazardous Materials Storage Area. We recommend that this area be evaluated by <br /> performing formal interviews with past and present employees of the CSMS area and that this area, if <br /> warranted, is included as a potential area of concern and soil sampling is performed. <br /> 4. Ditch Area (approximately 25 feet south of buried drum area) <br /> Figure 4 indicates an open ditch extending along the fence line which surrounds the buried drum area. <br /> The ditch also carries drainage alona the northern perimeter of the facility (south side of Stimson Street) <br /> until it discharges to the Stockton Storm drain system. Our inspection of the facility and Figure 4 <br /> suggest that potential run-off into the ditch could occur from surrounding vehicle and equipment storage <br /> areas. Our inspection of the ditch and surrounding areas did not reveal any evidence of leaks from <br /> equipment or vehicles. However, it appears the ditch could potentially have been impacted by drainage <br /> from other areas such as the CSMS, which stored hazardous materials and waste. Also, the ditch is <br /> approximately 100 feet northeast of the hazardous waste storage area (north of the CSMS) which may <br /> have been the site of "Old"hazardous waste spills (see discussion above comment 43). The ditch area <br />