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Workplan Addemdum Letter for a Limited Subsurface Site Investigation
<br /> Moore Petroleum,5491 F Street,Banta,California
<br /> Page 3
<br /> On August 6, 1999 Apex submitted a workplan titled, Workplan for Limited Subsurface
<br /> Investigation, proposing the installation of four additional groundwater monitoring wells (MW-
<br /> 4A, MW-7, MW-8, and MW-9). During installation, well MW-8 was installed with the screen
<br /> and filter pack extending well into the unsaturated zone for possible future use as a vapor
<br /> extraction well. In addition, underground piping was installed from well MW-8 (VEW-3) to the
<br /> former remediation compound (Figure 2).
<br /> On April 27, 2000 Apex submitted the report titled, Workplan for Limited Subsurface
<br /> Investigation, proposing the installation of three additional groundwater monitoring wells and
<br /> one deep soil boring.
<br /> On July 25 and 26, 2000, Apex personnel supervised the installation of three groundwater
<br /> monitoring wells (MW-10, MW-11, and MW-12).,The results of all soil and water sampling
<br /> were documented in the report entitled, Results Report for Limited Subsurface Investigation and
<br /> Third Quarter 2000 Groundwater Monitoring Report, dated August 25, 2000.
<br /> On November 17, 2000, Apex submitted the workplan titled, Workplan for Interim Remediation
<br /> & 4`h Quarter 2000 Groundwater Monitoring Report, proposing the installation of three recovery
<br /> wells and one vapor extraction well using the three recoverywells for a pumping test. SJCEHD
<br /> responded and only wanted one recovery well installed for the pumping test and depending on.
<br /> the results, more recovery wells could be installed.
<br /> On January 8, 2001, Apex supervised the installation of one vapor extraction well (VEW-2) and
<br /> one recovery well (RW-2). Results of the well installation can be found the report titled,Results
<br /> Report for Limited Subsurface Investigation and First Quarter 2001 Groundwater Monitoring
<br /> Report, dated March 9, 2001.
<br /> In March 2001, Apex performed a pumping test utilizing well RW-2. The results of the pumping
<br /> test were reported in Apex's 2"d Quarter 2001 Monitoring Report and Interim Remediation Plan
<br /> dated June 1, 2001
<br /> On August 24, 2001, Apex over drilled and reinstalled well MW-7 as a vapor extraction well. On
<br /> September 12, 2001, Apex personnel installed the remediation piping connecting wells MW-7,
<br /> VEW-2, and VEW-3 to the remediation compound.
<br /> In June 2002, construction and assembly of the vapor extraction system was completed. The
<br /> official start-up of the system was on June 17, 2002 as reported in the Source Test Results Report
<br /> dated July 31, 2002, and a Remediation Status Report dated October 4, 2002.
<br /> On November 10, 2003, SJCEHD recommended the installation of five groundwater monitoring
<br /> wells to delineate the lateral and vertical extent of contamination on the subject site.
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