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BROWN AND <br /> C A L D W E L L <br /> June 6, 1995 <br /> Ms. Diane M. Hinson <br /> San Joaquin County <br /> Public Health Services <br /> 445 N. San Joaquin Street <br /> Post Office Box 388 <br /> Stockton, California 95201-0388 017-2065-0111 <br /> Subject: ARCO Facility 434, 501 W. Kettleman Lane, Lodi, California, Site Code 1341 <br /> Dear Ms. Hinson: <br /> This letter provides the status for the location and abandonment of off-site groundwater <br /> monitoring well W-6 at the ARCO Products Company (ARCO) Facility 434 located in Lodi, <br /> California. As discussed in the first 1995 quarterly report, well W-6 was destroyed during <br /> demolition of the American Savings Bank or subsequent construction of a Boston Chicken <br /> restaurant near the same location. <br /> Prior to construction of the Boston Chicken restaurant, Brown and Caldwell identified to the <br /> contractor the location of three monitoring wells on the property and instructed the contractor <br /> that the wells were not to be damaged. During construction of the restaurant, Brown and <br /> Caldwell again notified the contractor that well W-6 should be protected and preserved. <br /> However, the well was either buried or removed during site activities and could not be <br /> sampled during the first quarterly event on March 2, 1995. On March 7, 1995, Brown and <br /> Caldwell personnel, with a contracted licensed surveyor attempted to locate the missing well. <br /> During this attempt, soil was excavated to approximately 3 feet below grade in a location <br /> where the survey indicated the well should have been. However, the well was not located and <br /> further investigation was delayed until more information could be collected. <br /> During March, 1995, a geophysical survey using ground penetrating radar (GPR) was used <br /> by Boston Chicken's environmental consultant to determine the location of well W-6. <br /> Information from the GPR survey indicated that the missing well was located near the back <br /> of the restaurant,,close to the location where the previous excavation occurred. <br /> The GPR location was represented by Boston Chicken's consultant as the location of the <br /> missing well. ARCO retained Brown and Caldwell to properly abandon the well according <br /> to the State of. California's well standards. On May 26, 1995, Brown and Caldwell, with a <br /> Environmental Engineering And Consulting-A nafyiicaiServices <br /> 0&06+95,E-.\2065\CORRESP,2065- I 3 <br /> QN[S-PS2200 16 MICRON AVENUE,-SUITE 600, SACRAMENTO, CA 93827-2627 _ - <br /> (916) 444-0123 FAX (916) 856-5277 <br />