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OV 0 0 Stacy Rivera EH] From: rc@choweng.com Sent: Monday, December 26, 2011 11:59 AM To: Stacy Rivera [EH] Cc: rc@choweng.com; lisa@choweng.com; kgregory@calwater.com; Dale Gonzales; scavallini@calwater.com; darmendariz@calwater.com; rmoilan@calwater.com; Raymond von Flue [EH]; Willy Ng [EH]; Kasey Foley [EH] Subject: Re: 1602 E. Lafayette St - SR0063739 Hello Stacy: Thank you for your email message attached, of Friday Dec 23, 2011. This response is a clarification of the procedures we are applying in the UST closures, per our Friday Dec 23, 2011 conversation: 1. The two 3 -inch pipes and one 11/2 -inch pipe associated with the USTs were excavated and cut at the building foundation. These pipes were removed for disposal as hazardous wastes. We have selected the option to remove the remainder of these lines from under the building. The lines extend approximately 12 ft under the building. This will meet the UST regulations for closure by removal of all underground piping associated with the tanks. 2. The three pipes in the southern trench were observed to be cut at the curb of the driveway. These pipes were also removed for disposal as hazardous wastes. We will conduct an excavation under the curb area of the driveway to determine whether these pipes continue under the driveway. If the pipes are present we will perform a removal or apply for a Closure In Place. If not, we will consider their termination at the curb line. 3. At this time we have not applied for a modification to the permit by the City of Stockton Fire Dept, or San Joaquin County EHD since we do not plan to leave in place any pipes associated with the UST closure. We believe that the present permits in hand covers these procedures for closure. The site work will continue on Tuesday Dec 27, 2011. Please contact me with any questions. Thank you. With Kind Regards, Reuben Chow. > Reuben, > I wanted to verify your proposals and discussion from our phone > conversation this morning, as well as from the revised work plan > emailed yesterday evening. > In regards to the two 3 -inch pipes and one 1 1/2 -inch pipe from the > northern piping trench, portions of the piping was found to exist > under the foundation of a building on site, and were observed to have > been partially plugged with concrete. The exact location of the 1 > 1/2 -inch piping under the building has not yet been determined. The > two 3 -inch pipes were found to extend for different distances under > the building (6 feet and 9 feet). Your work plan includes leaving > these pipes so as not to disturb the building foundation, and grouting > them by pumping concrete into the open end. It is my understanding > that, while you agree that the piping under the building will > technically be closed in place, you are proposing to use procedures > and a work plan that are not in accordance with current underground 1