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100, 0 Page 1 of 1 Natalia Subbotnikova [EH] From: Gebrehawariat, Tadese [tgebrehawariat@CIWMB.ca.gov] Sent: Tuesday, July 08, 2008 12:13 PM To: 'Jeff Bennett'; Natalia Subbotnikova [EH] Cc: Andrew Keller; Yekta, Gino Subject: RE: Cove Contractors Landfill Vapor Probes Hi Natalia — With regards to the subject matter, Cove Contractors is approved by the CIWMB as the Enforcement Agency for the City of Stockton to install additional probes around the landfill. This is consistent with the statement in our June 17, 2008 letter to Andrew Keller, Environmental Manager for TLE Properties, Inc. At this time, our view is that, monitoring probes PGP1 and PGP2 are still valid probes for the monitoring of landfill gas at the site but additional probes can be constructed, if the owner so desires. All constructed monitoring probes shall meet all applicable sections of Article 6, 27 CCR. We hope you find our response timely. From: Jeff Bennett [mailto:)Bennett@millerbrooksenv.com] Sent: Thursday, July 03, 2008 3:23 PM To: Gebrehawariat, Tadese; Yekta, Gino Cc: Andrew Keller Subject: Cove Contractors Landfill Vapor Probes Tad and Gino, I took the attached photo last week while in the field to show you the placement of the existing PGP -1 with respect to the property line. The original clay pit (and subsequent landfill) extended westward to the property line. Based on this photo, PGP -1 is approximately 30 feet east of the property line and therefore about 30 feet into the landfill. In addition, I was thinking that it might be informative for you to see the soil cuttings from the new groundwater monitoring well we installed in order to have a point of comparison for evaluating the presence of construction/demolition debris in the sediment recorded on the logs for the PGP -1 and PGP -2 pilot borings. I'll be back on site next week on Wednesday and Thursday (7/9 and 7/10) and if you are available I'd welcome the opportunity to show you why we feel that the PGP -1 and PGP -2 are located within the footprint of the landfill. During installation of MW -10A, Natalia Subbotnikova of the SJCEHD, requested that she receive authorization from the CIWMB for the installation of the two proposed landfill gas probes. I explained to her that you letter clearly stated that the property owner could install them if they wanted to but that you were not requiring them. It was my understanding that she needs to hear that you are OK with us installing the new probes. Could you please contact her by telephone (209) 468-0338 or e-mail nsubbotnikova_@.sjcehd.com? Please contact me with any questions or concerns via e-mail or by telephone (numbers below). Thanks, Jeffrey D. Bennett, PG, CHG, CEM Associate Hydrogeologist office: (714) 500-5454 cell: (714) 743-0482 i 7/8/2008