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Page 1 of 1 x <br /> 1 <br /> Vicki McCartney [EH] <br /> From: Ally Colavita [acolavita@advgeoenv.com] <br /> Sent: Monday, March 03.;2008 11:47 AM <br /> To: Nuel Henderson jEH]; Vicki McCartney [EH] <br /> Cc: Bill; Art ; Robert Marty <br /> Subject: Stefano's (1419 East Charter Way) <br /> Attachments: Stefano's.boring logs.pdf <br /> Hi Vicki and Nuel, <br /> A cross section in the desired area of the site is not available. Several boring.logs depicting the ozone sparging <br /> depths of the proposed ozone sparge wells are attached. As stated in the Work-Plan Addendum dated 19 <br /> November 2007, <br /> The ozone sparging system resumed operation in April 2007 and since that time ground.water sample <br /> results have not demonstrated any influence from the ozone system. Therefore, AGE recommends <br /> additional remediation wells to provide adequate ozone injection influence.The proposed ozone sparging <br /> points will be screened at the same depth as the existing monitoring wells in order to influence the known <br /> contamination zone. <br /> Proposed ozone wells will be installed to a depth of 50' bsg,,intersecting sands encountered between <br /> approximately 45' and 50' bsg, which represents the interpreted first groundwater bearing zone. Existing ozone <br /> sparge wells are injecting ozone at a deeper ground water bearing zone at approximately 58' to 62' bsg; above <br /> this zone appears to be clays, which may prevent the existing ozone sparge wells from effectively remediating the <br /> first groundwater bearing zone.between 30' and'50. bsg. <br /> E Thank you for your time. If you have any additional questions or comments, do not hesitate to contact me. <br /> Ally Colavita <br /> —Staff Scientist <br /> Advanced GeoEnviornmental, Inc. <br /> t 837 Shaw Road, Stockton, CA 95215 <br /> Phone: (209) 467-1006 <br /> Fax: (209) 467-1118 <br /> acolavita c adv>eoe� nv.corn <br /> www.advp-eoenv.com <br /> This email/fax message is for the sole use of the intended recipient(s) and may contain confidential and privileged <br /> information. Any unauthorized review, use, disclosure or distribution of this email/fax is prohibited. if you are not <br /> the intended recipient, please contact the sender by email/fax and destroy all paper and electronic copies of the <br /> original message. <br /> i <br /> I, <br /> k <br /> I� <br /> d <br /> f 3/3/2008 <br /> X <br /> 3 <br />