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$tafltEc <br /> September 11, 2009 <br /> Page 5 of 6 <br /> Reference: Work Plan for Site Closure,Caltrans Shop 10 Maintenance Facility <br /> Stockton,California <br /> V <br /> physical parameters analysis will include; air permeability, porosity, volumetric air and water moisture content, <br /> intrinsic permeability/hydraulic conductivity, grain density, dry bulk density,total organic carbon, and soil <br /> �.. classification (including grain size and Atterberg Limits). Following sampling, soil vapor wells will be <br /> destroyed by grouting over the surface of the well to match existing concrete. <br /> Task 3—Request for Site Closure <br /> A Request for Site Closure will be prepared consisting of a description of the work performed, results, and <br /> conclusions. In addition,the Request for Site Closure will contain the following: <br /> 4 <br /> ❑ An estimate of the mass of contaminant remediated and contaminant mass remaining at the Site, in <br /> both soil and groundwater; <br /> ❑ An estimate of the length of time for onsite dissolved contaminant concentrations to reach water <br /> quality goals; <br /> ❑ Sensitive Receptor Survey results and discussion of potential threat to receptors; <br /> ❑ A discussion on the remaining impacts to water quality, health or beneficial uses at the Site; <br /> �.. ❑ A discussion on the current risks to Site occupants of indirect exposure, gross contamination and <br /> vapor intrusion from remaining contamination at the Site; <br /> ❑ A Site map of soil and vapor sampling locations and summary tables of analytical results; <br /> ❑ Final soil gas iso-concentration maps for contaminants of concern; <br /> `r ❑ Field notes, boring logs, vapor volumes,flow rates, and sampling procedures used; and <br /> ❑ Laboratory reports, chemical analytical results, and COC forms from the soil vapor investigation. <br /> +� PROPOSED SCHEDULE <br /> Field work can commence immediately following Work Plan approval. A tentative project schedule is <br /> presented below: <br /> V <br /> ❑ Work Plan Approval—(30 days) <br /> ❑ Schedule Contractors, Complete Borings, Collect Soil and Vapor Samples—(four weeks) <br /> �.. ❑ Laboratory Reporting, Review of Data and Request for Site Closure—(four weeks) <br /> Please feel free to contact me if you have questions regarding this Work Plan at (925) 299-9300, extension <br /> ti.. <br /> 222 or Steve Strait at (559) 271-2650, extension 222. <br /> AL <br /> Sincerely, 0��,5v�N STRq`o0�s <br /> ' <br /> STANTEC CONSULTING CORPORATION <br /> No.4834 <br /> 6 * Exp-_a f o <br /> OF CA4Wa <br /> r.. <br /> Mario Sternad, PE Steve Strait, P.G., C.E.G., C.HG. <br /> �.. Senior Engineer Project Manager/Principal Hydrogeologist <br /> Tel: (925) 299-9300, Ext. 222 Tel: (559)271-2650, Ext. 222 <br /> Fax: (925) 299-9302 Fax: (559) 271-5108 <br /> Mario.Stem adO,Stantec.com Steve.Strait@Stantee.com <br /> I:1ProjectslCALTRANS%Shop t0120091Closurelciosure work plan fnl.doc <br />