|
i
<br /> � I
<br /> MONITORING WELL DESTRUCTION REPORT
<br /> Raymond Investment Corporation
<br /> 730 E.Channel Street
<br /> Stockton,California
<br /> 1.0 INTRODUCTION
<br /> This report was prepared by Condor Earth Technologies, Inc. (Condor) to describe monitoring well
<br /> l� destruction activities at 730 E. Channel Street(Site) in Stockton, California (Figures I and 2, Appendix
<br /> t A). The purpose of the work was to abandon monitoring wells located at the Site. The work included
<br /> destroying or abandoning eight groundwater monitoring wells and three soil vapor monitoring wells,and
<br /> collecting soil and groundwater samples for laboratory analyses. Condor prepared this report at the
<br /> request of Ms. Beverly Garcia of Raymond Investment Corporation (property owner) and as directed by
<br /> Ms. Victoria McCartney of the San Joaquin County Environmental Health Department (SJCEHD). All
<br /> work conducted by Condor was under the supervision of a California Certified'Engineering Geologist.
<br /> f 2.0 PROJECT BACKGROUND
<br /> On April 29, 2003, Oil Equipment Services removed one UST and associated piping at the Site. Soil
<br /> staining and petroleum odors were noted in the excavation and excavated soil. Following removal of the
<br /> ( UST,piping,dispenser, and filter,soil samples were collected from locations directed by the SJCEHD.
<br /> t Laboratory analytical results indicated that total petroleum hydrocarbons quantified as gasoline(TPH-G),
<br /> total extractable petroleum hydrocarbons quantified as motor oil (TEPH-MO), and total extractable
<br /> petroleum hydrocarbons quantified as diesel (TEPH-D) were detected at concentrations of 75 milligrams
<br /> per kilogram (mg/kg), 18,000 mg/kg, and 2,400 mg/kg, respectively, in the soil sample collected from
<br /> beneath the south end of the UST excavation at a depth of eight feet below ground surface(bgs).TPH-G
<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 /> May 14,2003.
<br /> Condor prepared the Soil'and Groundwater Investigation Work Plan, dated February 19,2004, which was
<br /> approved by SJCEHD with modifications in a letter dated March 17, 2004. Condor conducted soil and
<br /> groundwater investigation activities at the Site on May 5 and 6,2004. Laboratory analytical results of the
<br /> soil and groundwater samples collected during the investigation indicated that the soil and groundwater at
<br /> the Site were impacted by TPH-G and TEPH-D at some locations. Condor described the results of the
<br /> I investigation in the Soil and Groundwater Investigation Report, dated June 1, 2004. Condor prepared the
<br /> Monitoring Well Installation Work Plan, dated August 11, 2004, which was approved by SJCEHD in a
<br /> Ietter dated August 25, 2004.Condor installed three shallow groundwater monitoring wells (MW-1, MW-
<br /> 2' and MW-3) on September 23 and 24, 2004. Condor prepared the Monitoring Well Installation
<br /> Preliminary Report and Monitoring Well Destruction Work Plan, dated October 12, 2004, that described
<br /> the installation of MW-3 and the discovery of grout inside the well casing. Condor recommended that
<br /> MW-3 be properly destroyed and a replacement well (MW-3R)be installed approximately ten feet south
<br /> of MW-3. ]n a letter dated October 21, 2004, the SJCEHD approved the destruction of MW-3 and the
<br /> installation of MW-3R.Monitoring well MW-3 was properly destroyed and MW-3R installed on October
<br /> ;. 26, 2004. All field and analytical activities involved in the installation, development, and sampling of
<br /> monitoring wells MW-1,MW-2, and MW-3R and the destruction of monitoring well MW-3 are described
<br /> in Condor's Monitoring Well Installation Report, dated December 15, 2004.
<br /> r
<br /> A
<br /> I;J %t4�
<br />
|