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N KYLE CHRISTIE <br />„ PAGE 3 <br /> r, <br /> mass will be determined on a quarterly basis and presented in quarterly reports graphically, along with <br /> groundwater elevation data, over time. This presentation of the data will allow for any trends at the <br /> site to be evident to the reader. The additional data and the cost evaluation will ultimatley determine if <br /> natural attenuation is the best course of action for the site. <br /> 3425 N . Tracy Blvd., Tracy ARCO Facility # 2093 <br /> PHS/EHD contact - Harlin Knoll <br /> Operation of the vapor extraction system began on January 6, 1996. All the vapor extraction <br /> wells are open but there are no hard data results available yet. Operation of the air-sparge <br /> system will start once vapor concentrations have started to decline. The off-site delineation is <br /> still proceeding pending access from the property owners of the New Orleans Hotel. A second <br /> letter requesting access has been sent to the property owners. Monitoring well ATR#12 is to <br /> be abandoned when the off-site work is performed . Product is still being removed from <br /> ATR#8 . <br /> 25775 Patterson Pass Road , Tracy ARCO Facility #6100 <br /> PHS/EHD contact - Margaret Lagorio <br /> Future work at this site will be determined at a later date. <br /> 501 W. Kettleman Lane, Lodi ARCO Facility #434 <br /> PHS/EHD contact - Margaret Lagorio <br /> With sufficient data and justification this site may receive regulatory closure. ARCO does not <br /> want to drill confirmation soil borings at this time. It was discussed that an estimate of the <br /> amount of contaminants released could be made using groundwater and soil sample results <br /> prior to site remediation and that this amount could be compared to the amount of <br /> contaminants removed by the vapor extraction system to justify that further remediation was <br /> not necessary. <br /> 3212 N . California, Stockton ARCO Facility #2186 <br /> PHS/EHD contact - Steve Sasson <br /> Results of the recent soil boring and monitoring well installation will be submitted in a report in <br /> approximately 10 days. <br /> Summary <br /> The meeting allowed for continued communication between all parties and for continued progress at <br /> the sites. It also allowed for a discussion of Risk Based Corrective Action and PHS/EHD's plans for <br /> future program developments. The next meeting to discuss site progress was scheduled for Tuesday <br /> April 30, 1996 at 1 : 30 p. m. at the office of PHS/EHD . <br /> If you disagree with this summary or have any questions, please contact me at (209) 468-3449. <br /> Donna Heran , RENS, Director <br /> Environmental Health Division <br /> Margaret Lagorio, REHS <br /> Lead Senior <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Jay Johnson , EMCON c: Joel Coffman , B&C <br />