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0 • Page 3 of 11 <br /> 55 feet with non detect results at 65 and 75 feet.This suggests that the contaminated soil interval is <br /> from 50 to 70 feet. I would argue that well MW-4 shows this interval is now clean because 1)the <br /> well is screened through this specific interval (48 to 68 feet) 2) it is directly adjacent to the AS-20 <br /> and AS-21 and 3) it has reported remained completely non-detect for twelve of the last thirteen <br /> monitoring events. <br /> ? AS-14,AS-15,AS-17, AS-18, AS-20 and AS-21—I think some special consideration should be <br /> given before requiring the overdrilling of these 1-inch wells.There is a high probability that your <br /> 15-inch auger Plan B scenario would come into play on these 1-inch wells but even that scenario <br /> isn't failsafe. Having talked to two drilling companies about this, the 15-inch augers could easily <br /> wander off the grout column or become plugged during advancement, especially considering <br /> the depths of these wells. I believe that the method of destruction that is most protective of San <br /> Joaquin groundwater is to allow us to pressure grout and mushroom cap wells these <br /> problematic 1-inch diameter wells. I feel that this request is very reasonable in that all I am <br /> asking for is to destroy the wells in accordance with the California Well Standards detailed in <br /> DWR Bulletin 74-90 which would allow for the pressure grouting of these wells. Please know <br /> that I'm not trying to set a precedent with this and that I am only trying to do what I feel is best <br /> for my client and San Joaquin County's groundwater. Frankly speaking, it just doesn't make a lot <br /> of sense to me to increase the costs by literally thousands of dollars to end up with a grout seal <br /> that has no guarantee to be as good as the seal that we already have and know is working.And <br /> if you feel that this is something that warrants the approval of the director, please let me know <br /> what additional steps that would require. <br /> Thank you for working this out with me in advance. I, like you, would rather deal as many issues as <br /> possible while sitting nice and cozy in my office than in the cold January rain that I'm sure will start as <br /> soon we break ground. Please give me a call if you have any questions. <br /> Cheers and have a good weekend, <br /> -Josh Ewert I Senior Staff Geologist <br /> Geocon Consultants, Inc. <br /> 3160 Gold Valley Drive Suite 800, Rancho Cordova, CA 95742 <br /> Tel 916.852.9118 Fax 916.852.9132 <br /> www.eeoconinc.com <br /> From: Mike Infurna [EH] [mailto:MInfurna@sjcehd.comj <br /> Sent: Thursday, October 13, 20113:21 PM <br /> To: Evans, Brenda; Jim Barton <br /> Cc: McKenna, Stephanie; BORGIOTTI, SERGIO I; ngleason@DowneyBrand.com;jayallenl@att.net; Jim <br /> Brake; Josh Ewert <br /> Subject: RE: 5400 and 5606 Pacific Avenue, Stockton - Well Destruction Information <br /> Ladies and Gentlemen, <br /> I have evaluated the proposal/list of wells and destruction methods <br /> submitted to me and have the following changes to bring to your attention. <br /> I looked for current and historical soil, water, or vapor laboratory data for <br /> each well that was listed to be destroyed by pressure grouting. As I have <br /> stated before, the SJCEHD has a Well Standard (Ordinance) that provides <br /> 11/7/2011 <br />