SITE INFORMATION AND CORRESPONDENCE FILE 2

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during these activities. However,I was unable to identify any information in our historical files to confirm what this pipe is. We also checked the surroundings for any meter/pull boxes,but could not find any. Consequently, CRA is requesting a variance to destroy MW-5 by pressure grout instead of over-drilling methods as originally proposed. Thank you for considering this request. Larry From: Silva, Larry ,r Sent: Thursday, June 19, 2014 9:14 AM To: 'Gabriel Gonzalez [EH]' Cc: Adrienne;Ellsaesser [EH] Subject: RE: 620 West Charter Way, Stockton Gabriel, This morning when clearing well MW-5 for over-drill,we located a 4-inch diameter line adjacent to well casing(see attached picture). It is located approximately 1.5 fbg. At this time, I'm uncertain what this line is for. It's not connected to MW-5. It also wasn't picked up in our pre-field subsurface utility clearance activities. Based on how it's located adjacent to MW-5, it appears to have been installed after MW-5 was installed. I'm in the process of gathering more information. We will likely request a variance to destroy MW-5 by pressure grout methods. I will let you know what I find. Thank you, Thank you, Larry . From: Silva, Larry Sent: Wednesday, June 18, 2014 5:59'PM To: 'Gabriel Gonzalez [EH]' Subject: RE: 620 West Charter Way, Stockton Hi Gabriel, Due to the subsurface utilities that were identified adjacent to.wells IVIW-3 and MW-7, CRA requested a variance to destroy these wells by pressure grout versus over-drilling methods. Yesterday Wiscussed with you over-drilling these wells by installing a 5-foot section of casing and drilling through it. The casing would act as a guide so augers do not wander and potentially damage nearby utilities. However,after obtaining additional details this afternoon,I would like to revert to our previous request to not over-drill, but to pressure grout these wells for the following reasons: • Well MW-3 is only 13 inches away from the closest marked utility(electrical). The utility trench may only be 7 inches away. An AT&T line was also marked 2 feet away. Turns out well MW-3 was not installed in the center of well box, but was installed more to the west and is actually closer to marked utilities than thought. • Well MW-7 is located 26 inches away from electrical line.The utility trench may only be 20 inches away. • An distance of approximately 24 inches in diameter will be needed to install casing. Due to the close proximity of the utilities,there is a high likelihood of encountering pea gravel in the utility trenches,which will make installation of casing problematic. 2