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I <br /> E Mill <br /> Creek <br /> Associates Water Resource and EnvironmentaI Consulting <br /> F <br /> I � <br /> July 5 , 1994 rilil/iiU�IYEy r Aub <br /> PFRMNS- ^-$ <br /> I <br /> Ms. Linda Turkatte <br /> San Joaquin county Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Workplan for Additional Site Characterization - Roek Bros. <br /> Property, 102 S. Wilson Way, Stockton, CA <br /> Dear Ms. Turkatte, <br /> As we discussed by telephone, we have prepared a phased approach <br /> workplan for additional subsurface investigation at the above <br /> referenced site. The objective of the first phase of this work <br /> F will be to (1) , establish the historical source areas on the <br /> property, (2) install replacement wells capable of monitoring <br /> i current groundwater conditions, and (3) assessing options for <br /> remediation of impacted soils identified in the northwest corner of <br /> the property. Based upon the results of this work it is <br /> anticipated that additional wells will be sited and further <br /> characterization activities, such as hydraulic or vapor extraction <br /> testing, will be undertaken in the future. Similarly, a Soil <br /> Remediation Plan (SRP) will be prepared later based upon the <br /> feasibility analysis and sampling results conducted during this <br /> phase of work. We would expect to proceed with the previously <br /> approved plan for remediation of the stockpiled soils and drummed <br /> water currently on-site in conjunction with this subsurface SRP <br /> once it is approved. <br /> The scope of work <br /> p proposed for this phase of investigation is as <br /> follows: <br /> 1 . Perform historical research, to include review of air photos, <br /> Polk Indices and Sanborn Maps, as well as personal interviews to <br /> determine the layout and operation of the tank system(s) at the <br /> site. <br /> 2 Install 2 or 3 wells at the locations shown on Figure 1. The <br /> total number of wells will be based upon the water level observed <br /> in MW-6, which may prove to be unusable. Well completion depths <br /> will be based upon current groundwater depths and will entail a <br /> f,�v 'RQ- 130 0 M11f0q 1 Ca 96121 , Ph 916-253 2155 : Fax 916--253-2294 <br />