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e Cement Company yR`�ersid Environmental Office Phone (909) 683-6458 1490 Rubidoux Boulevard • Riverside California 92509 Phone (909) 683-3660 ext 405 Mailing Address P O Box 56040 • Riverside California 92517 Fax/Voice Mail (909) 686-5703 January 21, 1994 REUENEO JAW 2 1994 Margaret Lagono, Senior REHS Public Health Services San Joaquin County P O Box 2009 Stockton, CA 92501 RE Riverside Cement Stockton Gasoline Tank Site Closure Dear Margaret I enjoyed meeting you on January 11th and discussing the final closure aspects of the gasoline tank site with Bill Hunter As I am dust new on this project, I appreciate your • patience and consideration in working with me The current situation with the filled site, as Bill Hunter and I perceived it, is that the site was closed with clean sides and bottoms in addition to the clean water that seeped in overnight Our perception is that the testing constituted a clean closure and the subject would be closed with no further testing and no further costs However, you feel that the testing done to date, including the previous water testing, is not conclusive to prove closure, due to the close water table proximity to the site and that surrounding areas are already contaminated You recommended that further ground water investigation is required to prove clean closure and that a plan should preface the actual monitoring wcil (or wells' and the subsequent testing The short term plan, as well as future plans, need clarification from you 1 What specific chemicals/metals testing will provide evidence of clean closure') 2 Must all the first time monitoring well testings be N D to start the clean closure process9 3 From the time the monitoring wells are in place and sampled, when can the re-sampling be done (providing the first sampling is satisfactory)9 4 Will only two monitoring well tests of N D (or some other minute value) • be conclusive for clean closure9