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-en Z '7 TJII!j jollOjECT STANDAka RWqCn INTPRFACF SAMPLE: The tank r"MOv"I sanspiintc foJJ()w,,1 the standard protocol for Obtaining interface OMPIcti. Theria the Category or to bo of Primary concern to the required rat regulator ngencies ter determining if ndditional action will be Interested rt a"MP'ra wli:' h are known "atnP1011 fall into RWQcjl u nit, and 010 methodology lina been 00101Y defined In State and Publications, "'APPICmentli) and preventatiDn". Therin specify bot accelltbblu depth and ]at,. accordance with rul Bitulltion 11 thea of "nmple collection points. as Possible to the specifications, sample collection In is executed ata clore vertical axis with o center line (10FIKItudinal axis} of the tank and on a the fill Pipe. A corresponding location it' 01GO found t the OPPOttite and of the 1ard Interface samples are being collected, tank whenever atanr t, Briefly, the method consists of digging up native Boll from directly below tile fill Pipe and the Corresponding opposite and of the tank and obtaining n 88Mplu from the backfill/native roll interface or a short distance below the Interface. in tho case of one 6BmPle from beneath tan�u loan then 11001D ane in Y, only the tank Is required. A short distCOancPliceithan been defined by Rogion 2 Board engineers as not greater tbcn twenty-four inches below the backfill/native Roll Interface and in generally foot below the the backfill/native noil taken to be one In the backhoe bucket. interface. Thin coil is brought up and backfill material which may have been Included in the bucket, and the A ahovel or trowel is uaed to cut away surface r '0,1 sample Is taken by Pushing or driving a brass sample liner into the newly OxPoned KOH from tht designated depth and location. Additional clarifications by Region 2 Board engineers have Indicated that when there IS an obvious difference in the relative nation of Boil the interface depth, contamination brought up from Should be selected fo then it Is the rea more contaminated Boil that r inclusion ill talclfivOlY lample. ELECTIVE EXPLORATORY SAMPLES.- This type Of sampling employ, e o the same sample collection and handling procedures as are used in standard RWQc13 Interfac or from a position 8amplingbut the soil is typically obtained at 4 greater depth that (a laterally otraot from the Interface location. -J STOCKPILI? SURVEY MODIFIED 13AAQMD PROTOCOL: This sampling follows a survey Pattern, but uses a modified BAAQ110.0 protocol for sampling stockpile, of U material that have been newly removed frOW a tank Pit excavation. This Protocol calls for a discrete sample container to be collected for every 12.5 cubic Yards of material. The surve zy Includes opposite sides or the evaluating the levstockpile.- Strict obsels rfuel vance of the 8AAQMD Protocol (for purpose" of eOf vapor likely to be discharged from a stockpile) calls for inclusion of the surface materinl In the brass liner which is liner is driven into the P110 at a right tingle (to the angle of repose)--unt-il-the full. [IntesPeclf'Caliv-asked-to-follo--►-the - W E a BAAQ.14D protocol, our e routinely modify the'Procedure to exclude the surrOcO goil and collect soil from a depth or a ight, to eighteen Inches. While this the Sample In the direction of Yielding higher results prejudices BAAQMD sample, it is than would a strict more representative of the levels of fuel hydrocarbons Sampling Paport S=0_M_2 Chevron 1918. SECTION TIMER/pager