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Tt V Ms Lori Duncan Apnl 12,2001 • Page 3 of 6 and field screening results, were sealed, labeled, immediately placed in an ice chest cooled to a temperature of approximately 4° Centigrade, and transported to Argon Labs (ELAP 2359) under chain of custody protocol Samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) and diesel (TPHd) using EPA method 8015M, TPH as oil and grease using EPA method 1664, benzene, toluene, ethylbenzene and xylenes (BTEX) using EPA method 8020, oxygenated gasoline additives using EPA Method 8260B, VOCs using EPA method 8260, and total lead using EPA Method 6010 All drilling and sampling equipment was decontaminated prior to use and between sample collection to n m nuze the possibility of cross contamination Waste soil and water generated during drilling activities was placed in DOT approved 55-gallon drums Both waste streams are currently stored on site pending characterization for proper disposal 2.3 Well Construction Due to the wide range of initial and apparent static water levels (ranging from 10 to 22 feet bgs) encountered in previous borings, and in accordance with the workplan approved by PHS/EHD, wells MW1 through MW4 were screened from approximately 7 to 32 feet bgs The wells were constructed of 2-inch diameter Schedule 40 PVC casing and screen (0 010-inch slots) The filter pack consisted of 27 feet of 2112 silica sand The annular seal consisted of 2 feet of hydrated bentonite pellets overlain by three feet of concrete, which was approved on site by Lon Duncan of PHS/EHD The wells were completed with traffic-rated, flush-mount well boxes Boring/well construction logs are included in Attachment A 2.4 Well Development and Groundwater Sampling On December 19, 2000, a Ground Zero technician surveyed the well casing elevations, developed the new wells, and collected groundwater samples Water levels were monitored prior to well development An experienced Ground Zero technician developed the new wells by surging, baling and pumping each well until turbidity was numinized During the well development process, temperature, pH, and electrical conductivity were measured and allowed to stabilize prior to collecting a soil sample Groundwater purged from the wells was placed into labeled DOT approved 55-gallon drums, which are currently stored on site pending disposal Groundwater samples were collected from each well after physical parameters had stabilized and the water in the well had recovered to at least 80% of pre-purge levels Samples were placed in an ice chest at a temperature of 4° Centigrade and submitted to Argon Laboratory under chain of custody protocol The samples were analyzed for the presence of TPHg, TPHd, TPH oil and grease, VOCs, oxygenated gasoline additives, and total lead using appropriate analytical methods Field development/purge logs are included in Attachment B G1Data1GROUNDZMGABBARDVeports\WELLRPT doe