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PUBLIC HEALTH SERVICES �O.P4u�N•.C� <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> (209)468-3400 <br /> MANUEL SANCHEZ <br /> PACIFIC GAS <br /> 920 SOUTH DAVID AVENUE FEB 19 1993 <br /> STOCKTON CA 95205 <br /> RE: 2088 MARIPOSA ROAD SITE CODE: 1671 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> the review of the workplan to investigate the soil around the former tank pit area,dated January 28, 1993, <br /> and the addendum to the workplan, dated February 8, 1993, to investigate the former piping area, both <br /> submitted by Geological Audit Services, Inc. and has the following comments. <br /> Permit #93-0226 has been issued so that the drilling of the four soil borings around the former tank pit <br /> area and the two soil borings along the former piping area as proposed in the workplan can be scheduled <br /> to begin at any time. <br /> As the area encompassed and impacted by the former piping is extensive, it is unlikely the two proposed <br /> soil borings will be sufficient to determine the full extent of contamination in this area. Therefore, further <br /> assessment, either by additional soil borings/monitoring wells or by over-excavation,will be necessary to <br /> fully assess the extent of the contamination in this area. <br /> In addition, the levels of benzene, toluene, ethylbenzene, xylene and total petroleum hydrocarbons in the <br /> area of the former waste oil tank pit area are of a concern and must be addressed. Chromium, total lead <br /> and zinc are also constituents of concern at this location and need to be investigated further. <br /> The areas of concern mentioned above,and any areas not fully assessed during this current phase of field <br /> work must be incorporated into the next phase of work at this site. <br /> If the results of the soil sample selected for total lead analysis show lead at concentrations at or above 1.5 <br /> parts per million, the sample should then be subjected to the Waste Extraction Test,using deionized water <br /> as the extraction solution. This test will identify the portion of total lead in the soil that may become <br /> soluble and, therefore mobile, under normal site conditions. <br /> Please provide PHS/EHD with 48 hours notification prior to initiating any work at this site. If you have <br /> any questions, please contact Linda Turkatte, REHS, of my staff at (209) 468-0339. <br /> Jogi Khanna;' D., M.P.H. <br /> Health <br /> W <br /> urge A. Cotu ,REHS, Program Manager <br /> ,Environmental Health Division <br /> i LAC/It <br /> I c: CVRWQCB-Beth Thayer c: Geological Audit Services-Bob Marty <br /> A Division of San Joaquin County Hcalth Care Services �� <br />