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• Preliminary Environmental Assessment Report Pittman Elementary School,Stockton,CA December 10,2003 Page 4 • Eight discrete surface samples (B 1 through B8) were collected off-site on adjacent land to the north, east, and west of the site for the purpose of obtaining background data pertaining to metals. The sample locations are shown on Figure 3, Appendix A. Second discrete samples (1_16-5 and L16-D) were collected from the same sampling location as L15-S and Ll5-Dand analyzed for the same constituents for quality assurance/quality control purposes. The surface (0 to 6 inches) and subsurface (2.0 to 2.5 feet) samples were collected using a stainless steel hand auger and transferring the soil directly from the hand auger into laboratory-supplied glass jars. Each sample container was labeled for sample identification and placed in a cooler chilled with ice. The stainless steel hand augers were decontaminated in the field with a solution of laboratory-grade, non- phosphate detergent and deionized water and rinsed with deionized water prior to use at each surface and subsurface sample location. The equipment blank sample was collected following soil sample collection and subsequent decontamination by running deionized water through the sampling equipment and collected the water in laboratory-supplied containers. The samples were shipped in a cooler chilled with ice under chain-of-custody procedures via overnight carrier to Severn Trent Laboratories, Inc. in Arvada, Colorado, for analyses. 5.2 STRUCTURE DRIPLINE SAMPLES Discrete surface (0 to 6 inches) and subsurface (2.0 to 2.5 feet) soil samples were collected from the vicinities of each of the eighteen structures on site. The soil samples were collected from soil located along the driplines of each of the eighteen structures on site, where accessible. Where asphalt or concrete • was present, a jackhammer was used to remove the concrete or asphalt, and the soil samples were collected from the soil under the surface material. Four soil samples and three paint chip samples were collected from seven locations from the driplines of the property warehouse and transportation buildings. The eight houses, six sheds/garages, the Delta Center, and the sewage screening plant building had samples collected from four locations along the driplines. The rehabilitation building at the southwest comer of the property had soil samples collected from approximately seven locations along its driplines. The discrete surface soil samples were analyzed for lead. The deeper discrete soil samples (2 to 2.5 feet bgs) were archived frozen by the laboratory pending the laboratory results of the surface samples. Second discrete samples (P21-S, P21-D, P32-S, and P32-D) were collected from the same sampling locations as P20-S,P20-D, P31-S, and P31-D,respectively, for quality assurance/quality control purposes. The subsurface soil samples were analyzed for lead if the surface soil sample lead results were equal to or greater than 110 milligrams per kilogram (mg/kg). Based on the surface sample results, 30 subsurface soil samples were analyzed for lead. Sample locations are indicated on Figure 4,Appendix A. The surface (0 to 6 inches) and subsurface (2.0 to 2.5 feet) samples were collected using a stainless steel hand auger and transferring the soil directly from the hand auger into laboratory-supplied glass jars.Each sample container was labeled for sample identification and placed in a cooler chilled with ice. The stainless steel hand augers were decontaminated in the field with a solution of laboratory-grade, non- phosphate detergent and deionized water and rinsed with deionized water prior to use at each surface and subsurface sample location. The equipment blank sample was collected following soil sample collection and subsequent decontamination by running deionized water through the sampling equipment and collected the water in laboratory-supplied containers. The samples were shipped in a cooler chilled with ice under chain-of-custody procedures via overnight carrier to Severn Trent Laboratories, Inc. in Arvada, • Colorado, for analyses. 1 �.a CONDOR