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IrCrINTOORC 40 SOIL STOCKPILE SAINIPLING The following sections discuss the origins of the soil stockpiles and the sampling protocol ' used to characterize them Samples were collected in accordance with Versar s Site Intiestiga- tion Workplan Addendum, dated May 10 1996 and approved by PHSIEHD on May 15 1996 Mr Mike Inf ima of the PHSIEHD was on site to witness the first soil stockpile sample collected and the emptying of soil-filled drums stored on site 41 Background ' The soil stockpiles presently on site are denoted as soil stockpiles 1 d 1 in p p y p es , 2 an � The sol Soil Stockpile I was generated during the removal and over-excavation of the three 5,000-gallon USTs in January 1990 It is estimated that the stockpile consists of approximately 500 cubic yards and covers an area of approximately 3,500 square feet at an average height of four feet ' Soil Stockpile 2 was generated in 1992 during removal excavation, and installation of the present 15,000-gallon fuel storage tank An unknown portion of Soil Stockpile 2 was generated during removal and excavation activities by others at the wash pad area in 1992 The stockpile consists of approximately 1,250 cubic yards of soil covering an area of approximately 6 700 square feet at an average of five feet in height Forty-three 55-gallon drums were stored on site Soil Stockpile ') contained soil from 37 Y � drums of soil generated during previous site investigations Two drums contained water ' generated during the purging and development of the groundwater monitoring wells on site, and four drums were empty 4.2 Soil Stockpile Sample Collection ' Soil Stockpile 1 was apportioned into six areas of approximately equal volume One grab sample was collected from the approximate center of each area at a depth of approximately 2 feet Figure 4 shows the sample locations The samples, labeled SPI-I through SP1-6. were ' submitted to a state certified laboratory for analysis Samples SP1-1, SP1-2, and SPI-3 were combined by the laboratory into one composite sample, as were samples SP1-4, SP1-5, and SPI- 6 The two composite soil samples were analyzed for TPH-JP4, BTEX, and MTBE ' Soil Stockpile 2 was apportioned into four areas of approximately equal volume Three grab samples were collected from each area at a depth of approximately 2 feet Figure 5 shows ' the sample locations The samples were labeled SP2-1 through SP2-12 and submitted to a state certified laboratory for equal dr�ision into four composite samples The four soil samples were analyzed for TPH-D, TPH-JP4, TPH-G, BTEX, MTBE, and semi-volatile organic compounds (SVOCs) ' P%DSAIST0CKT0M33720U111STQTR RPT 7