SITE INFORMATION AND CORRESPONDENCE

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From: Baertschi, Dennis [mailto:dbaertschi(abcraworld.com] Sent: Thursday, January 22, 2015 2:58 PM To: Adrienne Ellsaesser [EH] Cc: Project Email Filing; Baertschi, Dennis Subject: 240943- 1267 Country Club Blvd, Stockton-Well Destructions —COR-240943— Importance: COR-240943importance: High Hi Adrienne, We are at the above site this week completing well destructions. We are doing airknife clearing (to 5 feet deep) today and have a situation where we have concerns about the proximity of an electrical line near wells S-4 and 5-11 (attached Site Map shows the location of these wells—near corner of Country Club & Pershing; and the attached photo shows the marked electrical line (in pink) and its proximity to wells S-4 and 5-11, with 5-11 being at bottom of the picture). The line was identified by our private utility locate service sub, and is a traffic control electrical line that goes from an electrical box in the sidewalk (out of the picture and locate just before you approach 5-11) and runs to another electrical box that feeds the traffic signal pictured at the corner of Country Club & Pershing(you can just see the traffic light's metal post). The location of this line was re-confirmed today by the City of Stockton and also confirmed today by potholing and physical locating it. This line is about 1 foot away from our well 5-11 and about 3 feet from our well S- 4. These two wells were proposed to be over drilled because during the last groundwater sample event there was very low level diesel hits in both wells. We have obvious great safety concerns with overdrilling these two wells because of 1) the very close proximity of the line to our wells, and 2) because it is an electrical line which can cause serious injury in a case of a accidental incident. Over-drilling well 5-11 presents the highest risk because the electrical line is so close. Because, as you know, we always err on the side of safety as our top priority, we asked Johnny Yoakum in the field today if we could get approval to pressure grout these two wells, and he denied our request and said he would mention it to his supervisor(s). I would like to again reiterate our request for an approval for a variance to pressure grout these two wells (particularly and most importantly well 5-11, which present the greatest danger to us); and/or have Jonny's denial for pressure grout approval be confirmed by his supervisors. Let me know if you have any questions. Thanks Adrienne - Regards- Dennis egards-Dennis Baertschi Conestoga-Rovers & Associates (CRA) 3969 Walnut Drive Eureka, CA 95503 Phone: 707-268-3888 ext. 202 E-Mail: dbaertschi(a)-CRAworld.com CRA and GHD have merged!To learn more,visit www.CRAworld.com/ghd 2