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�1 ARCADIS Ms. Lori Duncan <br /> 1- July 27, 2010 <br /> Permitting <br /> ARCADIS will obtain well destruction permits from the EHD. ARCADIS will <br /> coordinate field activities with the EHD and schedule an E inspector to provide <br /> oversight of the well destruction activities. <br /> Four well locations containing wells MW-6, MW-7, MW-10M, MW-1 OD, MW-11 M and <br /> MW-11 D are located off site within a city right-of-way. ARCADIS will obtain the <br /> necessary encroachment permits to access these wells fro T the City of Stockton <br /> Public Works (CSDPW) prior to performing intrusive field work. In addition, a traffic <br /> F control plan will be prepared by ARCADIS and submitted toy CSDPW for review and <br /> approval prior to performing intrusive field work. <br /> Field Activities <br /> Utility Clearance <br /> Prior to conducting subsurface work at the site, the well locations will be cleared for <br /> underground utilities by a private utility locator. In addition, 6nderground Services <br /> Alert (USA)will be notified at least 72 hours before intrusive field activities are <br /> initiated. <br /> Well Destruction <br /> Prior to destruction, the total depth of each well will be measured to confirm that the <br /> well casing is free of obstructions. ARCADIS proposes to destroy each well using <br /> one of the two methods described below based on the concentrations of petroleum <br /> hydrocarbons detected during the most recent groundwater sampling event. <br /> Pressure Grouting <br /> Groundwater monitoring wells MW-1, MW-2, MW-3, MW-6, MW-7, MW-9M, MW-91D, <br /> MW-10M, MW-1 OD, MWA 1 M, MWA 1 D, MWA 2D, MWA 3M and MW-13D will be <br /> destroyed by removing the well box at each well and pressure grouting neat cement <br /> into the well casing from the total depth of the well to ground surface, ensuring a, <br /> complete seal of the screened interval. Subsequently, a dril€ling rig equipped with 12- <br /> inch diameter hollow stem augers will be used to over-drill the top 5 feet of each well. <br /> Additional grout will be added as needed to obtain a column of grout to just below <br /> Page: <br /> IVarce6sus.comlDlficeOafalSacramanlo-CAVproject(EMftBRCA-044931G OWrverablrsmrnk Pte 1t.*We11O"mcl'an Wort(Plan 4493_Final_5581010950.d— 214 <br />