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r - '16 SAN JOAQUIN COUNTY ENVIRONMENTAL HEALTH DIVISION Karen Furst, M.D., M.P.H., Health Officer 304 East Weber Avenue, Third Floor - Stockton, CA 95202 209/468-3420 C A S E / CAPTAIN KEN KOOP MILITARY DEPT - STATE OF CALIF PO BOX 269101 SACRAMENTO CA 95826-9101 RE: Stockton Army Aviation Sup -Fac - 2000 Stimson Rd. Stockton, CA, 95206 AUG 0 3 2000 SITE CODE: 1732 RO# : 000052 San Joaquin County Public Health Services, Environmental Health Division (P1S-EHD) has recently reviewed the "Preliminary Assessment/Site Investigation Report dated May 26, 2000 as submitted by Versar, Inc. on June 12, 2000 and has the following comments. Although, this phase of investigation was required by the Central Valley Regional Water Quality Control Board (CVRWQB) and submitted to PHS-EHD as a courtesy, comments contained in Section 6.1, paragraph 2 (AASF-UST) are under the jurisdiction of PTS-EHD. Comments included in this section suggest that the underground storage tanks (UST) investigation is complete and that "case closure" (No Further Action) is recommended. Prior to your consultant submitting this request, PHS-EHD offers the following comments for your review. On May 27, 1998 UST # 4 & 5 were removed under permit issued by PHS-EHD. The UST's each were tied down to a thick concrete slab and PHS-EHD required either the slabs be removed so the soil underneath could be sampled or `bored' through so that soil samples maybe obtained, as required by UST regulations. Heavy rains during this time prevented four (4) of the required six (6) soil samples from being collected and the site activities were cancelled for that day. In phone conversations with your consultant later, PHS-EHD was advised that the UST pit was to be backfilled without the remaining soil samples being collected. PHS-EHD advised Mr. Jain, the government adviser at that time, that this requirement must be fulfilled prior to evaluating any closure requests. In addition, dark petroleum stained soils with strong petroleum odors were noted around the concrete slab in the most south-east corner of the UST pit. Your consultant was advised that the lateral and vertical extent of this contamination was to be delineated in an additional investigation proposal that the responsible party was to submit to PHS-EHD. UST site closure will not occur without the UST removal soil sampling requirements being performed. Additionally, further investigation in the southeast corner of the UST pit was required in 1998 and the work plan to initiate this work is overdue. A Division of San Joaquin County Health Care Services