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IN the relatively dense *0110 the I0cn1 ImPlemenUnit agency inspector decIdag not Icy have the interface soil atimpled and has the backhoe dig dorper 10 per If the contamination diminishes to accerinble levels. This exploration saves the property owner tht coal of running two GAMPICS at that location, and enables the Inspector to directly observe the condition of th* deeper soil. In both examples, ditto-rent material 19 collected in lieu Of a standard RWQCn Interface sampla, Further, the material collected Is subAtantially different from what would have been Obt-hined by taking representative moll at the Hoard aPecifled sampling location. Note that both of theme samples %,ere takon at the direction of the l0c4l implementing agency Inspector who was present at the alto and elected to "elect alternative Sampling jocfijfonii. Note too, that the these alternative 14mPloz may provide more Information about #[to than standard Board specified samples. However, an the LIA elected Samples do not accurately reflect soil conditions at the sampling pointz specified by the RWQCB.. the declition making process may be hampered. Clearly there In no advantage in limiting the ability of the regulator in the field to make prudent Judgements. Likewise, regulatory Personnel and consultants who will review the reports without benefit or having been present at the site need to know that the samples taken wars not obtained at the standard -locations. A simple revolution to these situations in a brief notation indicating that the sampling was elective rather than In accordance with a standard Board specification. These notations appear In the third column of thj TABLE OF SAMPLING LOCATIONS AND ANALYTICAL RESULTS. Ry referring to the not-a"Onz in Column three and four In the TABLE, any party reviewing the report should be able to determine If something other than Board standard samples were obtained, and -41,#n variant sampling was performed, clarity whether it was 2!ccted by the LIA Inspector, elected by our field Personnel, or the result of some physical condition at the site that made It impossible to obtain material from the correct sampling lova tion. SAMPLING METIIODOLOGIES USED ON TJUS PROJECT STANDARD RWQCB INTERFACE SAMPLE' The tank removal sampling followed the standard protocol for obtaining interface Samples. These samples tall into the category Of samples which are known to be of Primary concern to the Interested regulatory agencies for determining It additional action will be required at a site and the methodology has been closely defined ln,StA r%WQCB pubhestiong, to and RuPPItiatnts, and presenthtlons. These Specify both the acceptable depth and lateral situation of sample coll6cLien points. accordance with the" opecificationg, sample collection Is executed In I clog as possible to th*-cGntVr-)1n8 (longitudinal axis)-of-the-tank-tank and on - a vertical-axis a with the fill pipe. A correspondIng location Is also found at the OPr,*M1t* end of the tank whenever Standard interface samples are bding collected. Br'rfly' the method consists of dIKXInX up native soil from directly below the fill PJP* arid the corresponding opposite and of the tank and obtaining a SbaiPlinc Report U055-C-2 VMEVRON isle page 8