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Ms Lori Duncan Page 3 of 7 On November 8, 2000, approximately 165 cubic yards of soil was excavated in the vicinity of the former tank pit in order to remove contaminated soil from the subsurface, document the completeness of the removal effort with confirmation soil samples, and further investigate the vertical limit of contamination Confirmation soil samples collected from the floor and sidewalls of the excavation pit indicated that contamination did not extend beyond the limits of the excavation boundaries The excavation location is depicted on Figure 2 Analytical results are summarized in Table 3 An additional subsurface investigation was conducted on January 12, 2001 pursuant to a PHS/EHD directive dated January 2, 2001 to determine if groundwater had been impacted Non detectable levels of targeted analytes were found in the soil, however, analysis of groundwater indicated that low levels of chlorinated solvents and MTBE were present The location of boring SB 1 A is shown on Figure 2 Soil and groundwater analytical results are summarized in Tables 2 and 4, respectively On March 27, 2001, a meeting was held at the request of PHS/EHD to discuss options for further investigation of groundwater contamination at the subject site At the conclusion of the meeting, it was agreed that one monitoring well would be installed at the subject site with the understanding that additional monitoring wells might prove necessary in the future Ground Zero submitted the Workplan for 0iotwdivaterMotntoring Well Installation to PHS/EHD on April 10, 2001 The workplan was approved by PHS/EHD in a letter dated April 13, 2001 3.0 INVESTIGATIVE PROCEDURES In accordance with the approved workplan, one groundwater monitoring well was installed to further evaluate the nature and extent of soil and groundwater impact Information on water supply wells within 2,000 feet of the site was obtained from the California Dept of Water Resources 31 Permitting Prior to initiating fieldwork, well Installation permits were obtained from PHS/EHD All fieldwork was performed in accordance with the Ground Zero's Site Safety Plan and Quality Assurance/Quality Control Plan 3.2 Drilling find Soil Sampling On June 20, 2001, one soil boring was drilled and completed as a groundwater monitoring well The location of the well is shown on Figure 3 Spectrum drilled and installed the monitoring well under the supervision of field geologist Sean Garvey and project manager Gregory Stahl, a California Registered Geologist Ms Lori Duncan of PHS/EHD conducted the site inspection and observed field activities datalgrounzc\nsautolreportslweiireport doc