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Third Quarter 1998 Groundwater Monitormg Report <br /> Colberg Boat Works,401 North Stockton Street,Stockton,California <br /> Page 2 <br /> findings are summarized in their report,Phase I Preliminary Hazardous Materials Site <br /> Assessment, dated July 21, 1993 <br /> On December 12 and 13, 1994, Apex supervised the advancement of 11 subsurface probes to <br /> collect soil and groundwater samples at the site The results of the subsurface investigation are <br /> summarized in the report, Phase II Site Assessment Report, dated January 23, 1995 The results <br /> of the subsurface investigation indicated that areas around the former USTs were impacted by <br /> petroleum hydrocarbons <br /> Subsequently, Colberg Boat Works was directed by the San Joaquin County Environmental <br /> Health Division (SJCEHD) to perform further investigations at the site Apex proposed <br /> additional subsurface investigation and groundwater monitoring installation at the site The <br /> proposed work was documented by Apex in Workplan for Lammed Subsurface Investigation and <br /> Workplan Addendum for Limited Subsurface Investigation, dated May 2, 1995 and January 24, <br /> 1997, respectively <br /> On July 28, 1997, Apex personnel supervised the drilling of six soil borings, and converting the <br /> borings into six groundwater monitoring wells (Figure 2, MW-1 through MW-6) at the site The <br /> results of the work were documented by Apex in Results of Subsurface Investigation, dated <br /> August 21, 1997 <br /> In April 1998, Apex submitted a closure request for the former diesel tank location, which is on <br /> the west side of the subject site area and also recommended discontinuing analyses for oxygenate <br /> constituents with the exception of MTBE in wells MW-1, MW-2 and MW-3 Apex further <br /> recommended discontinuing analyses for TPHd in wells MW-1, MW-2 and MW-3 <br /> GROUNDWATER MONITORING <br /> Groundwater Levels <br /> On July 24, 1998, Apex personnel collected groundwater-level measurements from the three <br /> groundwater morutonng wells in accordance to the Apex Standard Operating Procedures(SOP) <br /> included as Appendix A All groundwater elevations were measured to the nearest 0 01 foot, <br /> referenced to the surveyed top-of-casing elevations Groundwater level measurements are <br /> summarized in Table 1 A potenttometric surface map of the shallow water-bearing zone on July <br /> 24, 1998 is shown on Figure 3 <br /> • <br /> KJ D 1PROJECT'S1COL01 001-COLBERG BOAT WORKSIQMR07981QMRTEXT DOC <br />