ARCHIVED REPORTS XR0007847 - Laserfiche WebLink

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Ms Lon Duncan August 24, 1998 Page 2 • SCOPE OF WORK Ground Zero will supervise the drilling and sampling of four soil borings in the viciruty of the former UST The locations of proposed bonngs are shown on Figure 2 A drilling company licensed in the State of California will advance the borings using a track mounted Geoprobe 5400 direct push ng Soil samples will be collected for logging and identification at 5-foot depth intervals Samples will be collected using a 1-mch diameter core sampler lined with clear acetate sleeves The portion of the sample to be analyzed will be immediately capped and preserved in an iced cooler at a temperature of approximately 4° Centigrade No cuttings requiring disposal will be produced using the direct push drilling method Borings will be backfilled to the ground surface with neat cement grout o0iy�- .benteartepellets Up to four soil samples per bonng will be submitted for analysis of total petroleum hydrocarbons as diesel (TPHD) and gasoline (TPHG) using EPA method 8015 modified, oil and grease using method 418 1 or 5520, benzene, toluene, ethylbenzene, xylenes (BTEX) using EPA method 8020, volatile organic compounds (VOCs) including gasoline oxygenate additives using EPA method 8260, and total lead using ICP 6010 Selection of soil samples for laboratory analysis will be based on field evidence of petroleum hydrocarbon contamination such as discoloration, odors, and FID readings, as well as lithologic changes One groundwater sample will also be collected and analyzed for the constituents listed above The . sample will be collected by dnving the sampler to the desired depth and exposing the screen to the formation The groundwater sample will be collected using a length of 0 17 inner diameter Teflon tubing equipped with a stainless steel bottom check valve The tubing will be inserted into the probe rods and pushed to the bottom of the sampler to the desired depth The groundwater sample will be brought to the surface by gripping the top of the tubing and rapidly moving the tubing up and down creating a positive displacement effect, thereby forcing the water sample to the surface where it will be collected directly into the sample containers All sampling and drilling equipment will be washed thoroughly with laboratory-grade detergent and water between uses to minimize the potential of cross contamination All field work will be conducted in accordance with the Site Safety Plan included in Attachment A A technical report describing field activities, analytical results, conclusions and recommendations will be submitted to Gene Gabbard, Inc, Ms Lon Duncan of PHS/EHD and Mr Mark List of the California Regional Water Quality Control Board(CRWQCB) A completed dnllrng pernut application and associated fees will be submitted under separate cover upon your approval of this workplan 9abbar&vq)0898 dorm