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Page 1 of 2 <br />Vicki McCartney [EH] <br />From:..: Anderson, Paul (PSC) [PaulAnderson@pscnow.com] <br />Sent Thursday, February 16, 2012:10150 AM <br />To: Nuel Henderson [EH] <br />Cc: Vicki McCartney [EH]; Adrienne Ellsaesser [EH] <br />Subject: RE: Quick Question on Well Abandonment Overd:rilling vs Pressure Grouting In -Place <br />Thanks for the quick reply Nuel. <br />really appreciate it. <br />Given that, it seems that overall, over drilling the wells is the best approach even though it's <br />more costly. <br />I'll make that change in both work plans: <br />Otherwise, l have both work plans completed and ready to go. <br />I'll be submitting the Airport Way Well Abandonment Work Plan next week and the Center <br />Street Work Plan will'be ready next week also. I'll submit Center Street once we receive your <br />letter directing us to submit it toyou'.J. <br />We are trying to schedule the well abandonments for, both. sites in mid-April <br />Thank you very much <br />Paul Anderson <br />From: Nuel Henderson [EH] [mailto:nhenderson@sjcehd:com] <br />Sent: Thursday, February 16 2012 12.35 PM <br />To: Anderson, Paul (PSC); <br />a. <br />Ccs Vicki McCartney [EH] Adrienne Ellsaesser [EH] <br />Subject: RE: Quick Question on Well Abandonment Overdrilling vs Pressure Grouting In -Place <br />Paul, <br />The San Joaquin County Well Standards: require.removal.of the well contents in areas of known or suspected <br />contamination,. this includes soil contamination:: We look at -more than just the last monitoring event to determine if <br />groundwater is no longer impacted in a well,. the. concentration history -must establish a high level of confidence <br />that groundwater is not impacted in the area. <br />Over-drilling of wells is the :preferred method -of well destruction in most cases;. research has shown that grouted <br />wells may still become vertical conduits through cracking of grout, lose of. bond integrity, between grout and <br />casing, of degradation of the casing, etc; ,but we do allow pressure. grouting as conditioned in our well standards <br />or if an over-riding safety concern applies: <br />have no basis to predict a future burden.to your;client, one way or another: <br />Nuel Henderson <br />From: Anderson, Paul (PSC)[mailto.'Pau1.Anderson@pscnow!com] <br />Sent: Thursday, February 16, 2012 9:47.AM <br />To: Nuel Henderson [EH]; Vicki McCartney [EH] <br />2/27/2012 <br />