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1 <br /> E11C�yt® <br /> . Mr James Barton <br /> November 2, 2004 <br /> Page 3 <br /> 1 of plume boundaries will be assessed Technologies that actively control lateral spread of <br /> the plume boundaries will also be evaluated as to their feasibility The pilot study will be <br /> started within 30 days after the bench scale study is completed <br /> 7 Upon approval of the CAP or work plan, ENSR will take the appropriate actions to complete <br /> tasks associated with the approved feasible remediation option A pilot study will be <br /> conducted within 45 days of CAP approval, if warranted <br /> Based on the RSE, comparative analysis, analysis of groundwater data from new wells in Unit <br />' C and Unit D, groundwater parameters related to intrinsic biodegradation, GE and feasible <br /> remedial options recommended in the CAP or work plan, a pilot study may be proposed Due <br /> to the large volume of effort and coordination required to complete items 1 though 7, ENSR is <br /> requesting a submittal date for the CAP or work plan no sooner than December 30, 2004 <br />' Proposed Well Installations <br /> To assess the groundwater gradient and the downgradient and cross-gradient extent of <br /> petroleum hydrocarbons constituents in groundwater in Unit C and Unit D, ENSR proposes the <br /> installation of two additional groundwater monitoring wells (MW-31 and MW-32) The locations <br /> of the proposed monitoring well are illustrated on Figure 2. <br /> Soil Boninns and Samplinu <br /> A geologist from ENSR will observe Cascade Drilling, Incorporated, of Rancho Cordova <br /> g P , <br /> California advance soil borings MW-31 and MW-32 to approximate depths of 90 feet and <br /> 103 feet bgs, respectively The borings will be advanced using a truck mounted drill rig using <br /> 8'/4-inch diameter hollow stem augers Soil samples will be collected at five-foot intervals and <br /> at changes in lithology to the total depth drilled Soil samples will be field screened for the <br /> I presence of volatile organic compounds (VOCs) using a photoionization detector (PID) Soil <br /> samples will be logged using Unified Soil Classification System (USCS) visual and manual <br /> methods Lithologic descriptions, PID readings, and other pertinent drilling information will be <br /> recorded on the boring logs Soil borings MW-31 and MW-32 will be completed as groundwater <br /> monitoring wells MW-31 and MW-32, respectively Field methods and procedures to be used <br /> by ENSR during drilling and installation of the proposed wells are summarized in <br /> Attachment B <br /> Soil Sample Analysis <br /> Selected soil samples will be submitted for chemical analysis based on elevated PID readings, <br /> sample depth, soil lithologic data and field observations A minimum of one soil sample from <br /> _ each boring will be submitted for chemical analysis <br /> . Selected soil samples will be submitted to California Laboratory Services (CLS) in Rancho <br /> Cordova, California under chain-of-custody protocol Soil samples will be analyzed for <br /> kOcs8cramentolprojects\Pro)ectskO694OZO98-293TmaAReportslWork PlansM98 Work Plan SVE AS System doc <br />