Laserfiche WebLink
1 reported the results of this investigation in the May 1999 Subsurface <br /> p g Y <br /> Investigation and Groundwater Monitoring Report <br /> Vent well VW-1 was installed and an additional air-sparging and SVE pilot <br /> test was performed in June 2000 The test was performed In accordance with <br /> the May 15, 2000 Pilot Testing Work Plan The pilot test results Indicated <br /> that this technology would be an effective method of treating petroleum- <br /> hydrocarbon Impact at the site Operation of a frill-scale air-sparging and <br />' SVE remediation system was Initiated on April 25, 2001 PSC Installed a new <br /> air-sparging well (SP-A) on March 14, 2002 upon determining that air <br /> infection at well SP-1 was not adequately remediating the petroleum <br />' hydrocarbon impact in groundwater <br /> In December 2002, the remediation system was disengaged, since its <br /> effectiveness to remove contaminants became limited Post-remediation <br /> monitoring was performed to evaluate the concentrations of petroleum <br /> hydrocarbons In groundwater and the stability of the plume The February <br /> 2003 groundwater sample from MW-1 indicated an increase in petroleum <br /> concentrations However, concentrations remained relatively stable in <br />' groundwater samples collected from other wells in the area of impact <br /> PSC submitted the April 14, 2003 Remedial Action Completion Report to <br /> SJCEHD The report presented a Site Conceptual Model, which characterized <br /> the release, subsurface conditions, and associated risks to potential receptors <br /> PSC determined that potential routes of exposure were improbable or <br /> incomplete and requested that SJCEHD consider granting closure of the <br /> environmental case SJCEHD requested that additional site investigation be <br /> performed in their January 9, 2004 response letter The February 20, 2004 <br />' Subsurface Investigation Work Plan, which proposed details of site work, was <br /> submitted to and approved by SJCEHD <br /> In June 2004, PSC performed the additional subsurface investigation <br /> Continuous soil lithology, from ground surface to a depth of 100 feet was <br /> evaluated at boring CPT-A using an electronic cone penetrometer testing <br /> 1 (CPT) system Seven CPT borings (CPT-A, -B, -C, -D, -E, -F, and -G) were <br /> drilled or advanced in the vicinity of the former gasoline USTs Soil samples <br /> were collected from the borings and were submitted for the analysis The <br /> 1 analytical parameter list included benzene, toluene, ethylbenzene, xylenes <br /> (BTEX), total petroleum hydrocarbons as gasoline (TPH-g), the oxygenate <br /> analytes of tertiary butyl alcohol (TBA), methyl tertiary butyl ether (MTBE), <br /> 1 di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), and tertiary amyl <br /> methyl ether (TAME), and the fuel additives 1,2-dichloroethane (1,2-DCA) <br /> and ethylene dsbronude (EDB), using test method SW-846 / 8021/8260B <br /> Groundwater samples were collected at three of the boring locations and were <br /> submitted for the same analytical parameters The CPT soil investigation <br /> indicated that the residual petroleum-hydrocarbon impact that remained after <br /> 3 <br /> Quarterly Groundwater Monitoring Report <br /> 4th Quarter-November 2005 <br /> Prepared for SARA I.EE BAKERY GROUP,INC Prepared by PSC Environmental services <br /> investigative and Quarterly Report 14th Quarterly Report 112005 doc February 24 2006 <br />