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PUBLIC"'VEALTH SERVICES aPlh <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION �+ <br /> N: X <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Heal ffic.U. :=. <br /> 304 E.Weber Ave., 3rd Floor • P. O. Box 388 • Stockton, A 951- • c. P <br /> 209/468-3420 <br /> TERRY TARDITI MAILED AUG 111995 <br /> T & T TRUCKING <br /> 11396 NORTH HIGHWAY 99 <br /> LODI CA 95240 <br /> In response to our August 4, 1995 telephone conversation regarding your request for a written <br /> response to your proposal to backfill the existing excavation at the above referenced site, San <br /> Joaquin County Public Health Services, Environmental Health Division(PHS-EHD) provides the <br /> following comments. <br /> To date soil samples collected from the excavation sidewalls, bottom and stockpile samples <br /> indicate no contamination at or above the detection limits applied (non-detect) for TPH as <br /> gasoline and BTEX components. <br /> However, the trench to the south end of the excavation has not yet been sampled. Groundwater <br /> has been observed to move from the north to the south apparently from surface irrigation activity <br /> in the adjoining walnut orchard north of the tank excavation. In addition soil types, sand, silt and <br /> silty sands observed in the excavation may act to aid rapid lateral and or horizontal contaminant <br /> migration. Further investigation in the form of soil sampling is therefore required in the <br /> vicinity of the original tank excavation. <br /> A workplan is anticipated to arrive at this office by August 11, 1995 for review and approval. <br /> Upon approval, please contact this office to schedule an appointment for sampling. <br /> A request for site closure cannot at this time be considered, however, the original tank pit may <br /> be backfilled and compacted with approved materials as described by the Uniform Building Code <br /> (PHS-EHD recommends fill material other than pea gravel). Include this proposal in the <br /> workplan you are submitting on August 11, 1995. <br /> If you have any questions please contact Ron Rowe, Senior REHS at (209) 468-0342. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Ronald Rowe, Senior REHS Diane M. znson, REHS <br /> Site Mitigation Unit Supervisor <br /> 11396.1et <br /> A Division of San Joaquin County Health Care Services <br />