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• Preliminary Environmental Assessment Report <br /> Pittman Elementary School,Stockton,CA <br /> December 10,2003 <br /> Page 9 <br /> Table 2—Laboratory Anal tical Methods Structure Dri lines <br /> Location Sample Depth Matrix Number of Discrete Constituent Method <br /> Samples Anal ses <br /> 8 Houses(4 per building) 0-0.5 feet b s soil 33 33 Lead 6010B <br /> 2-2.5 feet b s soil 33 10 Lead 6010B <br /> 6 Garages/Sheds(4 per building) 0-0.5 feet bgs soil 23 23 Lead 6010B <br /> 2-2.5 feet bits soil 23 9 Lead 6010B <br /> I Sewage Screening Station(4) 0-0.5 and 2-2.5 soil 4 shallow,4 4 Lead 6010B <br /> feet bits I dee held <br /> 0-0.5 feet bgs soil 4 4 Lead 6010B <br /> Warehouse Buildings(7) 2-2.5 feet b s soil 4 3 Lead 6010E <br /> aint chip 3 3 Lead 3050-7420 <br /> Rehab Center(7) 0-0.5 feet bgs soil 7 7 Lead - 6010B <br /> 2-2.5 feet b s soil 7 5 Lead 6010B <br /> Delta Center(4) 0-0.5 feet bgs soil 4 4 Lead 6010B <br /> 2-2.5 feet bits I soil 1 4 2 Lead 6010B <br /> Second Samples 0-0.5 feet bgs soil 2 2 Lead 6010B <br /> 2-2.5 feeLLQLs=== soil 2 1 Lead 6010B <br /> E uip ment Blank water I 1 Lead 6010B - <br /> 6.3 NATURAL GAS FIELD SAMPLES <br /> Thirty soil vapor samples were analyzed for methane by ASTM Method D-1946 and hydrogen sulfide by <br /> ASTM Method D-5504. Laboratory analytical methods for the constituents of interest are presented in <br /> Table 3, below. Air Toxics Ltd., a California-certified laboratory, performed the soil gas analyses. <br /> • Table 3—L boratory Anal tical Methods Natural Gas Field <br /> Location Sample Depth Matrix Number of Discrete Constituent Method <br /> Samples Analyses <br /> 10 feet bgs soil gas 15 15 Methane ASTM D-1946 <br /> 1 location per acre 15 Hydrogen Sulfide ASTM D-5504 <br /> (14.5 acres) 15 Methane ASTM D-1946 <br /> 20 feet bgs soil gas 15 15 H dro en Sulfide ASTM D-5504 <br /> 6.4 EASTERN FORMER UNDERGROUND STORAGE TANKS SITE SAMPLES <br /> Eight soil gas samples were analyzed for VOCs by EPA Method TO-15. Four groundwater samples were <br /> analyzed for VOCs by EPA Method 826013. Laboratory analytical methods for the constituents of interest <br /> are presented in Table 4,below. Air Toxics Ltd., a California-certified laboratory, performed the soil gas <br /> analyses. Argon Laboratories, a California-certified laboratory,performed the groundwater analyses. <br /> Table 4—Laboratory Anal tical Methods astern Former UST Site <br /> Location Sam le De th Matrix Number of Samples Discrete Analyses Constituent Method <br /> 5 feet bgs soil gas 4 4 VOCs TO-15 <br /> 4 borings 15 feet bgs soil as 4 4 VOCs TO-15 <br /> 40 feet bgs groundwater 4 4 VOCs 826013 <br /> 6.5 NORTHERN FORMER UNDERGROUND STORAGE TANKS SITE SAMPLES <br /> Eight soil gas samples were analyzed for VOCs by EPA Method TO-15. Four groundwater samples and <br /> • one travel blank sample were analyzed for VOCs by EPA Method 8260B. Laboratory analytical methods <br /> ow <br /> IL 4) CONDOR <br />