SITE INFORMATION AND CORRESPONDENCE

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PUBLIC HEALTH SER�IICES� SAN JOAQUIN COUNTY ..z.'' z ENVIRONMENTAL HEALTH DIVISION Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer C 4 �P 445 N. San Joaquin Street • P. O. Box 388 • Stockton, CA 9520 -0388 �rxo `' 209/468-3420 TREVOR SANTOCHi CRC ENVIRONMENTAL 17875 VON KARMAN SUITE 200 �1 IRVINE CA 92714 2 8 X199.5 RE. 1235 EAST ALPINE SITE CODE: 1512 STOCKTON CA Based on the information presented to San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) and the San Joaquin County Technical Review Committee (TRC), it has been determined that all investigative and remedial actions have been completed with regard to the former underground storage tanks at the above noted site. Therefore, PHS/EHD has made the appropriate notification to the Central Valley Regional Water Quality Control Board (CVRWQCB). A copy is enclosed for your information. The six existing wells at the site must be properly destroyed prior to the issuance of a formal closure letter. PHSIEHD and the TRC recommend the following well destruction methods: Monitoring wells MW#1 through MW#4 should be excavated to at least three feet below grade. Monitoring well MW#5 should be excavated to at least five feet below grade as this area is to be graded for a future street widening project. As monitoring well MW#6 is in a public right-of-way, the San Joaquin County Public Works Department should be contacted for any permitting requirements and to determine any preference for the final grade level finish at this well site. All wells except for monitoring well MW#4 should be pressure grouted with a neat cement grout so that the grout mixture infiltrates through the sand pack area of the well. The cement grout should be applied to the well until it pours over the top of the sheared casing to form a "cap". After the cement has set, the excavation may be backfilled with soil. A Division of San Joaquin County Health Care Services