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S E C ® R <br /> Second Quarter 2004, Groundwater Monitoring Report <br /> July 30, 2004 <br /> • Page 2 <br /> dl-isopropyl ether (DIPE), tertiary-amyl-methyl-ether (TAME), tertiary-butyl-alcohol (TBA), <br /> 1,2 dichloroethane (1,2 DCA), and 1,2 dlbromoethane (EDB) A summary of laboratory data is listed <br /> below <br /> CHEVRON <br /> Number of Detect5ons Minimum Maximum <br /> Constituents above the MDL of the 9 Concentration in pg/L(Well ID) Concentration in pg1L(Well ID) <br /> Total Samples <br /> TPHg 4 140(MW-1) 1 300(MW-2) <br /> Benzene 2 3(MW-5) 4(MW-2) <br /> MtBE 8 6(MW-4) 1 600(MW-3) <br /> Ethylbenzene 3 0 6(MW-1) 5(MW-5) <br /> Total xylenes 2 0 9(MW-5) 5(MW-2) <br /> Definitions <br /> MDL=Method Detection Limit <br /> pg/L=Micrograms per Liter <br /> ND =Not Detected <br /> ARCO � <br /> Number of Detections Minimum Maximum <br /> Total Samples Constituents above the MDL the 4 Concentration in pg/L(Well 1D) Concentration in pg/L(Well ID) <br /> TPHg 3 66(BMD-1) 1 600(E-10) <br /> Benzene 2 1 1 (E-9) 21 (E-10) <br /> MtBE 3 1 9(E-9) 280(E-10) <br /> Ethylbenzene 2 4 2(E-9) 34(E-10) <br /> Total xylenes 2 10(E-9) 160(E-10) <br /> Definitions <br /> MDL=Method Detection Limit <br /> pg/L=Micrograms per Liter <br /> QUARTERLY RESULTS SUMMARY (CHEVRON &ARCO) <br /> Groundwater flow across both sites was to the north, northeast at an approximate gradient of 0 06 to <br /> 0 006 foot per foot (ft/ft) Groundwater gradient has typically been to the north across both sites A <br /> groundwater elevation contour map of the two sites is presented as Figure 2 Groundwater <br /> concentrations for both sites are summarized for TPHg, benzene, and MtBE in Figure 3 <br /> CHEVRON's and ARCO's groundwater elevation and analytical data is summarized in Tables 1 and <br /> 2, respectively CHEVRON's and ARCO's groundwater analytical data for oxygenated compounds Is <br /> presented in Tables 3 and 4, respectively Historical groundwater gradient data is presented In <br /> Table 5 Field and laboratory procedures are presented in Attachment A CHEVRON's laboratory <br /> analytical results, chain-of-custody documents, and field data sheets are provided as Attachment B <br /> • <br /> 1Chevron1942751Penodic Monitoring\Q M R1200412004 doc <br />