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iSi, �,S'z' <br /> .4^m '� Ri'nw A • <br />�i <br /> LATHROP PROPER7Y <br /> WKA No. 1184.02 <br /> November 1, 1991 <br /> Page 2 <br /> Review of the September 3, 1991,sampling event analytical rc, Its reveals non-detectable concentrations <br /> of BTX&E in all 11 composite samples. Composite 4(Sample "'7 and S8), Composite 6(Samples 511 <br /> and S12)and Composite 10 (Samples S19 and S20),however, atained total petroleum hydrocarbons, <br /> ranging from 58 ppm to 180 pi these concentrations are above the 50 ppm concentration at which you <br /> indicated aeration is considered complete, The laboratory analytical results,including quality control data v <br /> and chain-of-custody, are attached in their entirety, <br /> We completed a second sampling event on October 11, 1991, in grid locations at which the initial <br /> sampling event revealed soils with remaining TPN concentrations above 50 ppm. The second event <br /> samples were identified in the same manner as in the first event, followed by the designation i <br /> Review of the second event analytical results reveals that Composite samples S7A-S8A and•S I iA-S 12A <br /> contain non-detectable BTX&E and TPH concentrations. Composite sample S19A-S20A contained non- <br /> detectable BTX&E concentrations and 42 ppm total petroleum hydrocarbons. <br /> We do not anticipate, based on the results of the laboratory n,•ialytical results and our field work, that <br /> additional soils remedial activities are necessary. We request that the property owners,subsequent to the <br /> removal of the underlying polyethylene barrier, be allowed to disc the successfully aerated soils into <br /> existing on-site soils. <br /> Wallace-Kuhl& associates, Inc. <br /> David Von Aspern <br /> Staff Geologist �'vD vF0 <br /> ANTHONY'. <br /> L. • SARA.CINO <br /> Anthony Saracino GEOL661ST Q <br /> Director of Environmental Services OF NV <br /> DVA:AS;sdm <br /> Copies to: Raymond Quaresma/Steve Mothershed <br /> Eleanor Ratliff, San Joaquin County Environmental Division <br />