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Soil and Groundwater Investigation Report and ` Second Quarter 2005 Monitoring and Sampling,US Can-Welty Road October 2005 is presented on Figures 5 and 6. Copies of the soil and groundwater chemical analytical reports with chain-of-custody documentation are included in Appendix F. 5.2.3 Investigation-Derived Waste Soil cuttings were stored in properly labeled 55-gallon, DOT-rated drums and stored at the site pending ` disposal by CEMC. The drums were removed on May 4, 2005 and transported from the site by Sturgeon & Sons,to the Altamont Landfill in Livermore, California. �- 6. WELL SEARCH RESULTS L In April 2004, SAIC conducted a search of DWR files to identify water supply wells within a 2,000-foot radius of the site. The water supply well search covered portions of Township 3-South; Range 4-East; sections 34 and 35. Three domestic wells(Figure 1, ID# 1, # 2, # 4) identified were located within the 2,000-foot radius;two of the domestic wells appear to be located up gradient of the former pipeline ROW, and one is located cross gradient to the inferred northeasterly groundwater flow direction. The well completion reports indicate the domestic wells were constructed with a minimum sanitary seal of 20 feet bgs. However,the well completion report for domestic well ID#4 did not state a well seal depth. Municipal or agricultural water supply wells were not formally identified during the April 2004 DWR search, yet,two wells(ID#5 and #6)were described as public wells and are located at the subject site. Both wells are sealed at 150 and 200 feet bgs, respectively. SAIC identified six monitoring wells, one ` groundwater extraction well, and one industrial well located within the 2000-foot radius. Six monitoring wells, one groundwater extraction well and one industrial well are located down gradient and cross gradient from the area of concern. The DWR water supply wells identified are presented on Figure 1 and summarized in Table 5. L 7. QUALITY ASSURANCE/QUALITY CONTROL ` An equipment rinsate sample(QA-R)was collected from a clean, disposable bailer, and accompanied the samples in shipment to the laboratory, using laboratory-provided deionized water. The equipment blank sample was analyzed for BTEX, MTBE, TPHg,TPHd, and PAHs. All tested constituents were not detected with the exception of phenanthrene, which was detected at the laboratory detection limit of 0.01 ` lig/L. One trip blank sample(QA-T)accompanied the site samples in each shipment to the laboratory. The trip blank samples did not exhibit concentrations of petroleum hydrocarbons(TPHg, BTEX, or MTBE)at or above the laboratory detection limits. Detailed descriptions and explanations are documented in the laboratory report included in Appendix F. S. WELL SURVEY On April 5, 2005, Morrow Surveying of West Sacramento, California(License# LS4650) surveyed all site monitoring wells. All wells were surveyed for vertical MSL elevations as well as for horizontal latitude and longitude coordinates, using APM GPS equipment. Well surveying and groundwater elevation data are presented in Table 6. Surveyor report is included in Appendix G. 9. WELL DEVELOPMENT On April 5, 2005 monitoring well MW-5 was developed. During the development of well MW-5, SAIC purged 10 well casing volumes of groundwater using a 2 inch-diameter disposable polyethylene bailer. ` During the purge process water-quality parameters(pH, specific conductance,and temperature) were recorded. Field data sheets are included in Appendix H. 7 From Science to Solutions-