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ARCADIS , ARCADIS <br /> Infrastructure, environment,.buildings 950 Glenn Drive <br /> Suite 125 <br /> Folsom <br /> California 95630 <br /> Mr. Michael J. Infuma <br /> Tel 916.985.2079 <br /> Senior Registered Environmental Health Specialist Fax 916.985.2093 <br /> -San Joaquin County Environmental Health Department www.arcadis-us.com <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> ENVIRONMENT <br /> Subject: <br /> Revised ork Plan for Well Destruction <br /> Chevro Service Station 96171 <br /> Pacific Avenue <br /> Stockton, California Date: <br /> June 18,2009 <br /> Dear Mr. lnfuma: Contact: <br /> Tonya R. Myers <br /> On behalf of Chevron Environmental Management Company(Chevron),ARCADIS <br /> has prepared this letter to provide a revised approach for the destruction of Phone: <br /> monitoring wells associated with Chevron service station 96171 located at 6633 916.985.2079 ext.15 <br /> Pacific Avenue in Stockton, California.The monitoring well destruction method Email: <br /> proposed in ARCADIS' Work Plan for Well Destruction dated May 29, 2009 consisted tonya.myers@arcadis- <br /> of pressure grouting to total depth and over-drilling the upper 3 feet of each well. us:com <br /> However, this approach was rejected by the San Joaquin County Environmental burref: <br /> Health Department(SJCEHD)as indicated in their e-mail dated June 15,2009,due 60046600.0000 <br /> to the dissolved perchloroethylene(PCE)plume associate with historical dry cleaning <br /> operations at the adjacent shopping center which extends beneath the Chevron site. <br /> Therefore, as requested by the SJCEHD, the monitoring well network will be over- <br /> drilled to total depth of construction.The specific methodology is discussed below. <br /> Proposed Scope of Work <br /> The scope of work includes the destruction of the 13 monitoring wells associated with <br /> the Chevron site(Figure 1).A schedule of the proposed monitoring well destruction <br /> activities are presented in Attachment 1. Well construction logs for the existing <br /> monitoring well network are provided in Attachment 2,with the exception of MW-7. <br /> No information is available on the installation of monitoring well MW-7:MW-7 is a 2- <br /> inch diameter monitoring well, and the measured total depth of the well is 62.69 feet <br /> below grade. <br /> I <br /> Imagine the result <br /> I <br />