ARCHIVED REPORTS XR0007821 - Laserfiche WebLink

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. App, p, Appendix A - Site Background Information Forn Former Stockton Plating Facility Page Page 4 of 7 The control further off-site migration of contaminants toward the east, in the predominantly down- each gradient direction The results of the pumping tests were reported in the AGE-prepared Ground inlet Water Extraction Pilot Test Report dated 31 January 2002 oxid mon The January 2002 report stated that the soil at the site has a high percentage of fine-grained matrix difft and overall is homogenous and mostly fine-grained In general this soil type has a high adsorption was capacity and low permeability, and thereby could potentially limit migration of dissolved hydrocarbons However,despite the fine-grained nature of the soil,the feasibility test results showed Sam that groundwater extraction should be effective on the site The groundwater extraction rates during streE full-scale remediation are not likely to exceed the pilot test extraction rate(five gallons per minute), mon and may be less for effective ground water extraction and stabilized drawdown In the report,AGE recommended the use of ground water extraction as an alternative ground water SVI remediation technique at the site Ground water extraction should provide adequate capture of the dissolved hydrocarbons, based on site-specific hydrogeologic conditions and hydrocarbon On distribution The limited areal distribution of high concentrations of dissolved hydrocarbons near the extr source of the release favors capturing the major portion of the dissolved hydrocarbons on the site well ,�-n A groundwater extraction system in the source area,along the down-gradient portion of significantly 2-in lair, impacted ground water, should effectively address the plume of impacted ground water AGE well recommended preparation of a remedial action work plan for the installation of additional ground MCI water extraction wells around the former UST area in order to increase 1)the efficiency-of-operation gall of a ground water extraction treatment system and 2)the effectiveness of the ground water extraction (sef systems ability to address the dissolved hydrocarbons inst. MOT' The AGE-prepared Final Remediation Plan, dated 23 April 2002,recommended the use of ground and water extraction as an alternative ground water remediation technique at the site, along with soil of S vapor extraction EHD letter, dated 26 July 2002, issued a denial FRP and requested an additional Pac cost analysis of remediation technologies The Ground Water Extraction Clean Up Analysis, dated 31 August 2002,supported the idea that the SV] limited areal distribution of high concentrations of dissolved hydrocarbons near the source of the release favors an aggressive approach for removing the dissolved hydrocarbon on-site AGE They recommended a ground water extraction system in the source area and along the historical down- ope gradient portion of significantly impacted ground water Dns API EHD approval letter of FRP technoloy date 28 May 2003 A Final Remediation Plan Addendum, dated 18 July 2003, was approved by the EHD on 29 July 2003 Me and Coll' 'to1 SOIL-VAPOR EXTRACTION SYSTEM INSTALLATION Advanced GeoEnvironmental,Inc