SITE INFORMATION AND CORRESPONDENCE

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PUBLIC PlEALTH SERVICES a�,N SAN JOAQUIN COUNTY t.. ENVIRONMENTAL HEALTH DIVISION y; Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer 304 E. Weber Ave., Third Floor * P. O. Box 388 • Stockton, CA 952 038 4c, RaNP 2091468-3420 BRETT LARSON MLED APR ? 0199E, UNION ICE LIMITED 6100 E SHEILA STREET LOS ANGELES CA 90040 Re: Union Ice Site Code: 241434 425 North Union Stockton CA 95205 San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) has completed review of the "Soil Vapor Investigation Workplan " and the "Revised Remediation Workplan for Stockpiled Soils" both dated January 11, 1996 and prepared by ICF Kaiser. PHSIEHD has the following comments for your consideration. The proposed work plan to further evaluate the possible additional sources of contamination to groundwater contamination included drilling using either a direct-push hydraulic or percussion drive- point sampling system to collect soil vapor samples. The work plan proposed seven sampling locations and indicated that gas samples would be collected at 15, 30 and 45 feet. Pursuant to a telephone conversation on February 13, 1996 with Walter Floyd of ICF Kaiser, the samples would undergo analysis using an on site laboratory and that the costs of analysis were included with the drilling costs. Soil gas surveys are generally very useful when defining plumes; however its usefulness to confirm additional source material, not previously detected, is questionable. PHSIEHD suggests that soil samples be collected as well for confirmation of soil gas analytical results. When the drilling permit application is submitted, along with the $89 permit fee, please indicate on the permit application that the borings will be destroyed using neat cement rather that bentonite chips. As PHSIEHD indicated in correspondence dated December 29, 1995, PHSIEHD concurs that off site disposal to a treatment facility, of small volumes of contaminated soil, is an effective remedial option. The revised work plan proposed to dispose of all stockpiled soils exceeding 100 ppm TPH-diesel. PHSIEHD recommends that the stockpiled soil with residual contamination that is less than 200 ppm TPH-diesel, be further evaluated to determine the actual threat which may be posed should this soil remain in place. PHSIEHD concurs with the off site treatment and disposal of approximately 150 cubic yards of significantly contaminated (up to 11,000 ppm TPH-oil and 5,500 ppm TPH-diesel) soil. If you have any questions, please contact me at (209) 468-0337. Donna Heran, RENS, Director Environmental Health Division Mary Meays, Senior REHS Margaret Lagodo, REHS Site Mitigation Unit Lead Senior MM1425UNION c: Elizabeth Thayer, CVRWQCB c: Jeff Lawson, Esq. c: Lee Hansen, Arctic Ice c: Dennis Green, Esq. c: John Farr, ICF Kaiser A Division of San Joaquin County Health Care Services