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1_.ammersville School District July 16, 1990 202/899-7003 8 underground utilities. Traffic cones, yarning signs, and caution tape, were placed in Hansen Road to protect passersby, and to divert traffic from the work area during drilling operations, " 5.2 DRILLING Three soil borings/monitoring wells were drilled at the site on June 19, 1990, to assess the -- horizontal and vertical extent of petroleum hydrocarbons resulting from the release of gasoline. The numerical designation of the borings/wells follows that from the previous investigation. The new borings are located immediately east of the subject site along Hansen Road;two borings (PAW-6 and MVJ-7)are located on the west side of Hansen Road,and the third(MW-8)is on the east side of the road, During drilling operations a photofonization detector(PID) was used to field screen the soil samples for hydrocarbon concentrations. Three 2-inch monitoring wells (MW-6, MW-7,and MW-8) were constructed in these borings 10 provide groundwater sampling points. Figure 2 depicts the locations of the soil borings/monitoring yells. _ 5.3 SOIL BORINGS The soil borings were drilled with a truck-mounted drill rig equipped with 8-inch outside diameter (O,D.),steam-cleaned,halfow-stem augers. The drilling was supervised by a field geologist working under the direction of a State of California registered geologist. A continuous log of materials encountered while drilling was completed by the field geologist(Appendix 11). All soil generated during the drilling operation was stored on site in Department of Transportation (DOT)-approved containers pending resilts of laboratory analyses. Alf downhole drilling equipment was steam cleaned between borinos and all soil _ - sampling equipment was steam cleaned between sampling runs to prevent cross-contamination. All rinseate generated during the steam cleaning operations were pumped into DOT-approved rov,.d pp containers and I stored on site pending laboratory analysis of the soil samples. 5.4 SOIL SAMPLING Soil samples were collected from the soil borings at 5-foot intervals to the total Cepth of the borings(20 feet),beginning at approximately 5 feet below ground surface, Samples were collected during drilling using a 2.5-inch O.D.modified California split-spoon sampler, lined with three 2-inch diameter by 6-inch long brass sample tubes. Odor,discoloration of soil,and a PID were used as field screeningaoafs__._-__..—_ ------- ------- ._ o assess a presence of petroleom hydrocarbons in the soil, The samples were subsequently sealed, capped, labeled, and placed on ice in an insulated cooler. Based on AID screening and visual C. GRO Nl)4%ATER TECHNOLOGY,INC.