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In addition,I understand that to pressure grout, no detectable concentrations of contaminants can be.detected, but <br /> wells MW-3 and MW-7 appear to pose`a low risk to local aquifer:: <br /> • At well MW-3(screened from-20-40 fbg),only low-concentrations of.MTBE (1.5 Itg/L-below WQOs) in <br /> groundwater and T.PHg(1.3 mg/kg at 26 fbg) in soil were detected. - <br /> • At well MW-7 (screenedfrom 25 to 40 fbg), no gasoline.constituents were detected in groundwater. Although <br /> low concentrations of gasoline constituents were detected in soil'samples(21 and 25 fbg),.it:is likely that these <br /> concentrations have likely decreased to non--detectable concentrations through natural attenuation processes <br /> as it has been over 25 years since these samples were collected. <br /> Thank you for considering this request. <br /> Larry J. Silva <br /> Conestoga-Rovers&Associates(CRA) <br /> 10969 Trade Center Drive,Suite 107 <br /> .Rancho Cordova,CA 95670 <br /> Phone: 916.889.8914 <br /> Fax: 916.889.8999 <br /> Email: lsilva@crawo.rld.com <br /> www.CRAworld.com <br /> I <br /> From: Silva, Larry <br /> ,Sent: Tuesday; June 17, 2014 5:20 PM <br /> To: 'Gabriel Gonzalez [EH]' <br /> Subject: 620. West Charter Way,Stockton <br /> Hi Gabriel, '. <br /> I received your message about providing additional details on how we plan on destroying wells MW-3 and MW-7. <br /> I'm sorry for the delay in'response—I'm.waiting to hear back from driller to get some clarification on the processthat I <br /> spoke to you about. I will get back to you first thing tomorrow morning. <br /> Thank you, <br /> Larry J. Silva <br /> Conestoga-Rovers&Associates(CRA) <br /> 10969 Trade Center Drive,Suite.107 <br /> Rancho Cordova,CA 95670 <br /> Phone: 916.889.8914 <br /> Fax: 916.889.8999 <br /> Email: Isilva@craworld:com <br /> www.CRAworld.com <br /> PLEASE THINK BEFORE You PRINT <br /> Perform every task the safe way,the right way,every time! <br /> You <br /> 0 <br /> I <br /> I <br /> This communication and any accompanying document(s)are confidential and are intended for the sole use of the addressee. If you are not the intended <br /> recipient,please notify me at the telephone number shown above or by return a=mail and delete this e-mail and any copies. You are advised that any <br /> disclosure,copying,distribution,or the taking of any action in reliance upon the communication without consent is strictly prohibited.Thank you. <br /> 3 <br />