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JAMES GIOTTONINI <br /> PAGE 2 <br /> I << <br /> * Smith Environmental will prepare the system design which will go out to <br /> bid within three weeks.. The design, bidding, permitting and construction <br /> should be completed by December 1995. <br /> f Argonne and Picardy r <br /> Twinning grouted and sampled the recently installed monitoring well <br /> without notifying PHS/EHD. However, the soil and groundwater results <br /> showed nondetectable'!levels. The well must be sampled at least one <br /> more time (at least thirty days after the first sample event). If the <br /> second sample event yields nondetectable levels a closure report should <br /> be submitted to PHSIEHD and should include a workplan to destroy the <br /> monitoring well at the site. <br /> i <br /> 1740 Houston Avenue <br /> * Tank removal soil results confirm that the east end of the tank pit is <br /> clean at 11 feet. The grab sample from the middle of the excavation at <br /> 11 feet during the over excavation activities on April 3, 1995 had a <br /> strong petroleum odor..1 A sidewall sample of unknown depth indicates <br /> that contamination is extending laterally beneath the building. <br /> * An addendum to the existing workplan must be submitted to PHSIEHD <br /> within three to four weeks to describe the procedures to: <br /> 1) Backfill the east'end of the tank pit in the presence of the <br /> PHSIEHD inspector. <br /> 2) Dewater and overexcavate the west end of the pit and the <br /> dispenser area. !+ <br /> 3) Sample the west end sidewall to determine if an investigation <br /> beneath the building is warranted. <br /> 4) Submit a workplan for the investigation beneath the building if <br /> necessary. <br /> * The workplan is to be implemented within two weeks of PHSIEHD <br /> approval. <br /> k <br /> 2500 Navy Drive � <br /> * The angle borings under the maintenance building'(B1 and 132) showed <br /> residual contamination:' All other soil boring and monitoring well sample <br /> results were non detect. Modeling of residual contamination will <br /> determine if further work or investigation/mitigation, is required. <br /> 4010 East Main <br /> The soil borings recently installed at the site showed only a limited <br /> amount of soil contamination remaining between 10 and 15 feet. A <br /> it , <br />