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PUBLIC �IEALTH SERVICES a�,N <br /> SAN JOAQUIN COUNTY <br /> �-� <br /> ENVIRONMENTAL HEALTH DIVISION U,:a_ a <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer �` ` �= '• <br /> 304 East Weber Avenue, Third Floor Stockton, CA 95202 <br /> 209/468-3420 . <br /> BRETT (ARSON �*.f 1,97 <br /> UNION ICE LIMITED <br /> 6100 E SHEILA ST <br /> LOS ANGELES CA 90040 <br /> Re: Union Ice Site Code: 241434 <br /> 425 North Union <br /> Stockton CA 95205 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed review <br /> of the "Report on Soil Gas and Soils Investigation and Groundwater Monitoring" dated April 15, 1997 and <br /> prepared by Farr Associates and ICF Kaiser Engineers. PHS/EHD has the following comments for your <br /> response. <br /> The report included the results of soil gas, soil, and groundwater sampling. Soil and soil gas samples <br /> were collected on September 9 and 10, 1996. The results of the sampling indicated residual <br /> contamination in the area of former tank#3 of soil gas vapors up to 10,570 ppmV (SVS) at 42 feet below <br /> ground surface (bgs). The analytical results for the soil sample collected at 45 feet bgs from the area of <br /> SV5 did not document the same level of contamination as only 10 ppm TPH-kerosene was detected. <br /> The results of the August 9, 1996 and March 6, 1997 groundwater sampling events continued to evidence <br /> low levels of TPH contamination; however, 38 ppb benzene was once again detected in the sample <br /> collected on August 9, 1996 from MW2 located in the vicinity of former tank#3. While certainly natural <br /> attenuation of the remaining groundwater pollution is occurring, the reported concentrations do not <br /> appear to be reducing, since benzene concentrations have previously ranged from <.5 ppb (July 7, 1993) <br /> to 50 ppb (February 1, 1995) to <.5 ppb (July 27, 1995). No groundwater samples were collected between <br /> October 31, 1995 and August 9, 1996 when again benzene was detected. Also, it should be noted that <br /> with the exception of monitoring well, MW1, the monitoring wells are screened between 79 and 59 feet <br /> bgs. and the most recent groundwater depth (verbal from J.Farr)was approximately 43 feet bgs. Current <br /> thought is that groundwater samples obtained from wells with submerged screens are diluted. Additional <br /> groundwater sample results will be necessary to confirm the most recent results. Please notify PHS/EHD <br /> at least 48 hours prior to the next quarterly sampling event. <br /> The report included the conclusion that a closure report be prepared according to Appendix B of the Tri- <br /> Regional Guidelines. The closure plan should include the results of the next groundwater sampling event <br /> and should evaluate the potential threat which the remaining soil contamination may pose to groundwater <br /> quality. <br /> If you have any questions, please contact me at (209) 468-0337. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> nZ <br /> Mary Meays, Senior EHS rgarer agorto, RENS <br /> Site Mitigation Unit Supervisor <br /> c: Elizabeth Thayer, CVRWQCB c: Jeff Lawson, Esq. <br /> C Lee Hansen, Arctic Ice c: Dennis Green, Esq.,. <br /> c: ,John Farr, Farr Associates <br /> A Division of San Joaquin County Health Care Services <br />