ARCHIVED REPORTS_XR0012715 - Laserfiche WebLink

Home Browse Search

OR- P R- mfg-',N�guftpff, r. R-2 1201 Q= Mm OWN= the rf,-lnt1velY dense soil, the local implementing agency inapcctor decides • not to brivo the Interface moll sampled and buis the backhoe dig deeper to ace it the ciontaminn Lion dimiminhen to acceptable levels. Thia exploration Novae thn property owner the coat of running two Numple-ts at that location, and anablan the Inapoctor to directly inbaerve the condition of the deeper soil. In both OxAmplen, different materini Is collected In ficu of a standard RWQCH interface sample. Further, the material collected In substantially different from what would have bran obtained by taking representative soil at the hoard specified sampling location. huts tlins both or these samples were taken at the direction of tha local Inoplemointing agency Inspector who was present at the site and elected to select Alternative sampling locations. Note too, that these alternative aLmples may provide more information about the site than standard Board specified samples. However, as the LIA elected samples do not, accurately reflect anil conditions at the' sampling points specified by the RWQCB, the decision 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 of having been pre3ent at the aite need to know that the samples taken were not obtained at the standard locations. A simple resolution to these situations Is a brief notation Indicating that the sampling was elective rather than In accordance with a standard Board specification. Therm notations appear In the third column of the TABLE OF SAMPLING LUCATIONS AND ANALYTICAL RESULTS. • BY referring to the notations In column three and four in the TABLE, any party reviewing the report should be able to determine If something other than Board standard a3mplas wars obtained, and when variant sampling was performed, clarify whether it was elected 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 moterial from the correct "mpling location. SAMPLING METHODOLOGIES USED ON THIS PRWEILT STANDARD RWQC8 INTERFACE SAMPLE:I The tank removal sampling followed the standard protocol for obtaining interface samples. These samples fall into the category of samples which are known to be of primary concern to the Interested regulatory agencies for determining If additional action will be required at a site and the methodology has been closely defined In State and RWQCB publications, supplements, and presentationn. These specify both the acceptable depth and lateral situation of sample collection points. In _--accordance with-these-specUkAtions,-*&Mple-C011CCUOn-JS-40X9CUt4d-&S-Close as possible.to the center.line flongitudints) axis) of the tank and on a vertical axis with the fill pipe. A corresponding location is also found at the opposite end of the tank whenever standard interface samples are being cnilected. Briefly. the method conuists or digging up native itall from directly below the fill pipe and the corresponding opposite and of the tank and obtaining a Sampling Report 88057-C-1 Chevron 1918 SECTION TWO/Page 8