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s4 ^ I <br /> III <br /> 1 ' 4 <br /> 4 <br /> l I <br /> rn <br /> TERRY TARDITI J <br /> T & T TRUCKING <br /> 11396 NORTH HIGHWAY 99 <br /> LODI CA 95240 Tq <br /> v <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 <br /> the following comments. <br /> To date soil samples collected from the excavation sidewalls, bottom and stockpile samples <br /> I.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 they tank excavation. In addition soil types, sand, silt <br /> and silty sands observed in the excavationmay act to aid rapid lateral and or horizontal <br /> contaminant migration. Further investigation in the form of soil sampling is therefore <br /> required in the 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 tdschedule 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. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> li <br /> F: } <br /> I <br />