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Quarterly Monitoring Report Page 4 <br /> Morton-Alco&Unocal Operable Units April 27,2007 <br /> WKA No. 6324.02 <br /> DTW and DTP, if present, were recorded in each monitoring well from the top-of-casing(north <br /> side). Table 2 includes DTW, DTP (if present), and calculated groundwater elevations obtained <br /> from this monitoring event. Table 2 also includes a compilation of historical DTW, DTP, and <br /> ' groundwater elevations. Groundwater elevations are presented in feet relative to mean sea level <br /> (msl). <br /> 4.2 Groundwater Sampling <br /> In addition to groundwater monitoring conducted on February 5, 2007, groundwater samples <br /> were collected from the eleven monitoring wells. Prior to sampling, each well was purged of <br /> ' approximately three casing volumes. During purging, turbidity, temperature, pH, conductivity, <br /> and total dissolved solids measurements and/or observations were recorded for each monitoring <br /> well. Appendix A contains the records of sampling activities and measurements taken during <br /> sampling. <br /> ' Following purging of the calculated well-purge volume, groundwater samples were obtained. <br /> Each groundwater monitoring well was purged using an electric submersible pump and samples <br /> were collected from the purge pump discharge. Dedicated low-density polyethylene (LDPE) <br /> tubing was used for each well for purging/sampling. All groundwater samples were collected in <br /> laboratory-preserved, analyte-specific sampling containers provided by the analytical laboratory. <br /> Samples were immediately placed in an ice-chest containing ice and submitted under chain-of- <br /> custody documentation to Kiff Analytical, LLC of Davis, California, a California Department of <br /> Health Services-certified laboratory for analysis of the constituents of interest as follows: <br /> 1 <br /> • EPA Method 8015,modified <br /> ■ Total petroleum hydrocarbons-as-Diesel (TPHd) <br /> ■ Total petroleum hydrocarbons-as-motor oil (TPHmo) <br /> • EPA Method 8260B <br /> ■ Total petroleum hydrocarbons-as-gasoline (TPHg) <br /> ■ Benzene, toluene, ethylbenzene, and xylenes (BTEX) <br /> ■ Fuel oxygenates, tert-butanol (TBA),methyl tert-butyl ether(MTBE), di-isopropyl <br /> ' ether (DIPE), ethyl tert-butyl ether(ETBE), tert-amyl methyl ether (TAME), <br /> methanol, and ethanol <br /> 1 <br />