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GEOMATRIX <br /> off-site disposal by Sturgeon and Son, Inc., of Richmond, California, who is contracted directly <br /> with ChevronTexaco. <br /> The groundwater samples were labeled and placed in an ice-cooled chest immediately after <br /> collection and transported to Friedman&Bruya, Inc., of Seattle, Washington, under chain-of- <br /> custody procedures. The groundwater samples were analyzed for the following constituents in <br /> ' accordance with the MRP: <br /> ' • total petroleum hydrocarbons quantified as gasoline (TPHg) analyzed using <br /> U.S. Environmental Protection Agency (U.S. EPA) Method 8015M; <br /> ' • total petroleum hydrocarbons quantified as diesel (TPHd) analyzed using U.S. EPA <br /> Method 8015M after silica-gel preparation using U.S. EPA Method 3630M; and <br /> ' • benzene, toluene, ethylbenzene, xylenes (collectively referred to as BTEX) analyzed <br /> using U.S. EPA Method 8021. <br /> The groundwater samples were also analyzed for the following constituents as requested by the <br /> RWQCB in their July 18, 2000, letter to ChevronTexaco: <br /> • TPHd analyzed using U.S. EPA Method 8015M (without silica-gel preparation <br /> procedure); and <br /> ' • Polycyclic aromatic hydrocarbons (PAHs) using U.S. EPA Method 8270C SIM. <br /> Groundwater samples were also analyzed for inorganic parameters for evaluation of intrinsic <br /> ' bioremediation. A discussion of intrinsic bioremediation parameters is presented in Section 3.0 <br /> and Appendix B. <br /> 2.2 GROUNDWATER FLOW AND DIRECTION <br /> Groundwater level measurements are included in Table 1 and summarized on Figure 2. <br /> Groundwater elevations in the wells during this monitoring period fluctuated a maximum of <br /> about 0.1 foot compared to those measured during the previous monitoring event. <br /> ' Groundwater elevations calculated from the well measurements indicate an easterly horizontal <br /> gradient(Figure 2). This horizontal groundwater flow direction is consistent with previous <br /> monitoring results, which have varied between easterly and northeasterly. <br /> 2.3 GROUNDWATER ANALYTICAL RESULTS <br /> • No sheen or measurable separate-phase petroleum was present in the wells at the time ground- <br /> water samples were collected. A summary of recent and historical analytical results of <br /> 1:\PRO]ECI12000s12463WOCUMEN'2463 12-02 spt.dm 3 <br />