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(/"ICkyton <br /> c'oo. ... .E, <br /> • Phase II Environmental Site Assessment for Area 4 (Treadwell & Rollo, August <br /> 17, 2001). This investigation included soil and groundwater sampling. <br /> Further Characterization at the West Weber Avenue and North Lincoln Street <br /> Site, Parcel 2A (Clayton, December 18, 2001). This investigation included <br /> lithology logging using Cone Penetrometer Testing, evaluation of potential free <br /> phase petroleum product using an ultra violet induced fluoroscopy tool, soil <br /> sampling, and groundwater sampling. <br /> • Site Delineation Report, Parcel 2A and Adjacent Areas, Stockton California, <br /> (Clayton August 22, 2002). This report documented additional lateral and vertical <br /> delineation as well as a soil gas survey and monitoring well repair. <br /> • Quarterly Monitoring Report, Former Unocal and Morton Paint Facilities, <br /> Weber and Lincoln Streets, Stockton, California (Clayton November 1, 2002). <br /> This report <br /> The results from the latest quarterly monitoring event (as reported in the November 1, <br /> 2002 report) indicate that total petroleum hydrocarbons in the gasoline range (TPHg) are <br /> defined to the east and south, TPH in the diesel range (TPHd) is defined to the south, and <br /> TPH in the motor oil range (TPHmo) is defined to the east and south. These figures are <br /> presented as Figures 5, 6, 7. Based on this observation, to achieve complete delineation <br /> of petroleum hydrocarbons and related compounds in groundwater, monitoring wells are <br /> needed to the southeast, north, and east. <br /> 4.0 SCOPE OF WORK <br /> The scope of work for the plume delineation activities is summarized in the following <br /> bullets: <br /> • Prepare and distribute a document to provide public notice of the type and <br /> duration of upcoming work activities (to be coordinated with activities west of <br /> former Harrison Street), <br /> • Install five monitoring wells (3MW-1R, MW16-19), <br /> • Abandon Well 1MW-1, which is damaged and partially filled with sand, �' J <br /> • Develop the newly installed monitoring wells, and survey the wells for location <br /> and elevation, <br /> �- `• Obtain water levels and sample the,newly installed monitoring wells for the <br /> corresponding quarterly event, <br /> • Add the newly installed wells to the quarterly monitoring program, and <br /> 4 <br /> PL SAlM\PR0=S\E00}\03t39 Unocal Lincoln and Wa10 nwkpin10ec0')\wkpinl dcc0a.dnc <br />