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. Soil Cas Investigation Work Plan
<br /> Raymond Investment Corporation
<br /> May 24,2006
<br /> Page 2
<br /> and TEPH-D were also detected at concentrations of 2.0 and 200 mg/kg, respectively, in the soil sample
<br /> collected from beneath the location of the diesel filter. The-UST removal activities and the results of the
<br /> laboratory analyses were described by Condor in the Underground Storage Tank Removal Report dated
<br /> rr May 14, 2003.
<br /> In a letter dated November 4, 2003, to Ms. Beverly Garcia, Ms..Victoria McCartney of the SJCEHD
<br /> directed Raymond Investment Corporation to submit a work plan to investigate the lateral and vertical
<br /> extent of contamination at the Site. Condor prepared the Soil and Groundwater Investigation Work Plan,
<br /> dated February 19, 2004, which was approved by SJCEHD with modifications in a letter dated March 17, r
<br /> 2004. Condor conducted soil and groundwater investigation activities at the.Site on May 5 and 6, 2004.
<br /> Laboratory analytical results of the soil and groundwater samples collected during the investigation
<br /> indicated that the soil and groundwater at the Site were impacted by TPH-G and TEPH-D at some
<br /> locations. Condor described the results of the investigation in the Soil-and Groundwater Investigation
<br /> Report, dated June 1, 2004. Ju the report, Condor recommended preparing a.work plan for the installation
<br /> of three groundwater monitoring wells and initiating quarterly groundwater monitoring at the Site. In a
<br /> _letter dated July 7, 2004, SJCEHD directed the preparation and submittal of a.work plan for the
<br /> s installation of three groundwater monitoring wells at the Site. Condor prepared the Monitoring Well
<br /> Installation Work Plan, dated August 11, 2004 that was approved by SJCEHD in a letter dated.August
<br /> 25, 2004. Condor installed three shallow groundwater monitoring wells (MW-1; MW-2, and MW-3) on
<br /> September 23 and 24, 2004. Condor prepared the Monitoring Well Installation Preliminary'Report and
<br /> Monitoring Well Destruction Work Plan, dated October 12, 2004, that described the installation of MW-
<br /> .3 and the discovery of out inside the well casin . Condor recommended that MW-3 should be properly
<br /> . r7' gr g p P Y
<br /> destroyed and.a replacement well (MW-3R) be installed approximately ten feet south of MW-3. In a
<br /> . 'r . letter dated October 21, 1004, the SJCEHD approved the destruction of MW-3 and the installation of
<br /> MW-3R. Monitoring well MW-3 was properly destroyed and MW-3R installed on October 26, 2004. All
<br /> field and analytical activities involved in the installation, development, and sampling of monitoring wells
<br /> MW-1, MW-2, and MW-3R and the destruction of monitoring well MW-3R are described in Condor's
<br /> Monitoring Well Installation Report; dated December 15,2004.
<br /> Quarterly groundwater monitoring was initiatedafter the wells were installed. Groundwater samples
<br />' were analyzed for TPH-G, TEPH-D, TEPH-MO, and total extractable petroleum hydrocarbonsq uantified
<br /> as kerosene (TEPH-K); benzene, toluene, ethyl benzene, total xylenes (BTEX); and gasoline
<br /> oxygenatesladditives. The gasoline oxygenates/additives include methanol, ethanol, tertiary-butanol
<br /> (TBA), methyl tertiary-butyl ether(MTBE), di-isopropyl ether(DIPE), ethyl tertiary-butyl ether(ETBE),
<br /> tertiary-amyl methyl ether(TAME), 1,2-dichloroethane(1,2-DCA),and EDB.
<br /> On November 8 2004 February 4 2005 May 4 2005 August 16 2005 and November 1$ 2005 07 L N33�
<br /> monitoring events were conducted by Condor. The groundwater elevation in the monitoring wells ranged
<br /> from approximately -18.5 to -21 A feet. The groundwater gradient for the Site was approximately 0.005
<br /> ft1ft to the east-northeast. None of the analytical constituents were detected at or above the laboratory
<br /> reported detection limits in the groundwater samples collected from monitoring wells MW-1,MW-2, and
<br /> MW-3R during the November 2004, February 2005, and November 2005 groundwater monitoring
<br /> events. On May 4, 2005, TPH-G and TEPH-D were detected in the groundwater sample collected from .
<br /> MW-1 at concentrations of 170 micrograms per liter (µg/L) and 110 �tg/L, respectively. On August 16,
<br /> 2005, TPH-G and TEPH-D were detected- at 92 µg/L and'82 gg/L, respectively, in the groundwater
<br /> sample collected from monitoring well MW-2.No other analytical constituents were detected at or above
<br /> the Iaboratory reported detection limits in the samples collected from those wells on those dates.
<br /> �la CONDOR
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