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Report of Results investigation of Agricultural Chemicals in Soil PureGro/Brea Facility 1905 North Broadway Ave.,Stockton,CA Sierra-Pacific Project No.94-055.08 Impact samples were collected and analyzed as described above, in accordance with the procedures in the approved work plan. Chain-of-custody forms were completed, and the soil samples were transported in an iced-cooler to Sequoia Analytical Laboratories, Inc,, located in Sacramento, within 24 hours of collection. 4.6 Abandonment of Soil Borin s Wa to and Rinsate Stgrauge and L)igposal Upon completion of the soil boring program,each of the open soil borings was tremmie-grouted to the surface with a bentonite-cement slurry in accordance with State and county-decommissioning policies. Soil cuttings were placed in 55-gallon Department of Transportation(DOT)-approved drums that are labeled, dated, and staged at the Broadway Avenue site for disposal. Augers and sampling equipment were cleaned at the site after use. Rinsates from equipment decontamination were also placed in 55- gallon DOT drums and staged at the site pending analysis and disposal. 4.7 Laboratory Analysis of Samples All samples collected were analyzed for NO;-N by EPA method 300.0, and for TKN by EPA method 351.4. Additionally, samples from borings NSB-1,NSB-2, NSB-3, and NSB-4 were also analyzed for halogenated volatile organic compounds by EPA method 8010. The results of the NO;-N and TKII analyses are presented in tabular form in Table 1 herein. Values for total nitrogen are also presented in Table 1 and on Figure 3. To provide accurate site specific data on the physical properties of the on-site soils for future use in a risk assessment for this site, three soil samples (NSB-2-20,NSB-5-5, and NSB-6-20) were submitted to Unocal's contract laboratory, PTS Laboratories, Inc. of Santa Fe Springs, California, for physical testing. The samples chosen represented the range of soil types encountered during this investigation. The samples were tested for moisture content by ASTM method D2216, for porosity by API method RP40, for bulk density by ASTM method 2937, for soil pH by EPA method 9045, for grain size by ASTM method D4464M, for total organic carbon by the Walkley-Black method, and for permeability (reported as native state effective permeability to water and native state effective water conductivity) by ASTM method D5084. t i Sierra-Pacific Groundwater Consultants, Inc. 10