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Nbool .,i <br /> TETRA TECH, INC. <br /> Table 3-1 Sampling and Analysis Methodologies and Comparison Values <br /> COC EPA SW-846 Groundwater Residential Soil Residential Soil <br /> Method ESL(Itg/L) ESL(µg/L) Gas ESL(µg/ra) <br /> TPH-G 8015 500 100 — <br /> TPH-D 8015 640 100 — <br /> TPH-O 8015 640 100 — <br /> Benzene 8260 27 0.74 42 <br /> Toluene 8260 130 9.3 160,000 <br /> Ethylbenzene 8260 43 4.7 490 <br /> Xylenes 8260 100 11 52,000 <br /> Acenaphthene 8270 23 19 — <br /> Anthracene 8270 0.73 2.8 — <br /> Benzo(g,h,i)perylene 8270 0.10 27 <br /> Chrysene 8270 0.35 3.8 — <br /> Fluoranthene 8270 8.0 40 — <br /> Fluorene 8270 3.9 8.9 — <br /> Naphthalene 8270 24 3.1 — <br /> Phenanthrene 8270 4.6 11 — <br /> Notes: COC chemical of concern <br /> EPA U.S.Environmental Protection Agency <br /> ESL SFBRWQCB Environmental Screening Level (groundwater is not a current or potential <br /> drinking water source) <br /> SFBRWQCB San Francisco Bay Regional Water Quality Control Board <br /> TPH-D total petroleum hydrocarbons in the diesel range <br /> TPH-G total petroleum hydrocarbons in the gasoline range <br /> TPH-O total petroleum hydrocarbons in the oil range <br /> µg/L micrograms per liter <br /> pg/m3 micrograms per cubic meter <br /> 3.4 STEP 4: DEFINE THE BOUNDARIES OF THE STUDY <br /> 3.4.1 Target Population <br /> The target population consists of all possible samples within the study area. Sample units will vary <br /> depending on the actual analyses to be performed. <br /> 3.4.2 Spatial and Temporal Boundaries and Other Practical Constraints <br /> The spatial boundary of the study area is limited to the groundwater, soil, and soil gas on the southern <br /> portion of the Site. All soil and groundwater samples must be kept at a temperature of< 6 degrees <br /> Celsius(°C)from time of collection until analysis. <br /> Sampling Effort Work Plan Page 3-3 <br /> Tracy Mansfield Property <br />