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11/28/89 12 20 $707 74 5581 KAPREALIAN ENG FILLNER CONST, Z 003 KEz-p99-1105 .W1 November 28, 1989 Page 2 2 . Site prscripti The service station site occupies the northeast corner at the intersect Location Map and Siteant Plan Street kton, California. are attached� PROPOSED FIELD WORK PHASE 1 _ rUEld TANKPIT ExCAV T ON KEI proposes additional excavation of the fuel tank pit beneath 2ULN) , C(3LN} to the maximum sample points A(1UL5) , B( and D(4LN) excavation depth capability. Additional sampling will be performed to define the vertical extent of the soil contamina- tion. The undisturbed backhoe. ac�maple The will wine bee u lk delivered to material, excavat y a certified laboratory. After sampling, the fuel tank pit beneath sample points A(IULS) , B(2ULN) , C(3LN) and D(4LN) will be excavated to the depth of the additional pit bottom samples. All excavated soil will be stockpiled on-site for further sampling. KEY further proposes to define the lateral extent of contamina- tion by collecting tank pit sidewall s,xmples at an interval not to exceed one sample per 20 linear feet of original tank pit perimeter. The undisturbed samples will again be collected from bulk material excavated by backhoe as described above. After sampling, the tank it walls will be excavated laterally to the sample paints, withexcavated soil s ocj:p led on-site for further sampling. All tank pit bottom and sidewall sample; will be analyzed for TPH and as gasoline 1803) in 1 accordance ( with 8oan) , TEL JoaquinDHLocal�Health EDB (DHS ) District guidelines. 2 All excavated soil stockpiled on-Vne mill be sampled to deter composite sample will bre mine appropriate disposition- collected collected from each 50 cubic yaof stockpiled soil. Each compo sample will consist of two individual grab samples {,aken at various locations and depths from 1 to 2 feet,asiteand will samples be composited by the laboratory as one sample. Comp will be analyzed for TPH as gasoline and HTX&E. All excavated hazardous material, as determined by composite sample laboratory on- results, ) stint to a Class II disp will be sent to a Class I disposal site. A11 Osal hazardous excavated soil will be: l site, 2) retained on-site for aeration and re-sampling,' of 3)