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z r yl 1-J 2021899-7004 Larrtmt:rsville School District b July 16, 1990 _ were placed in Hansen Road to underground utilities, Traffic cones, warning signs, and caution tape, protect passersby, and to divert traffic lrom the work area during drill'ng operations. 5.2 DRILLING 19, gto assess the Three soil boringslrnonitoring wells were drilled at tha site f on the re easeof gasoline. The horizontal and vertical extent of petroleum hydrocarbons resulting the previous investlgatian. numerical designation of the borings/wells follows that from ings The new borings are located immediately east of the subject site along third(MW-8)R ond;two bcrast side (MW-6 and MW-7)are located on the west side of Hansen Road,ar' of the road. During drilling operations a photo;onization detector(PID) was used to lieandrMw )were samples for hydrocarbon concentrations. Threc 2-inch monitoring wells(MW 6,MW-7, undwater sampling points. Figure 2 depicts the locations of constructed;n those t orings to provide gro the soil borings/monitoring Neils. 5.3 SOIL BORINGS with 8-inch outside diameter The soil borings were drilled with struck-mounted drill riequipped ya field geologist working under (O.D.),steam-cleaned,hollow-stem augers. The dr 1.+ng was supervisedtered while uous log of rials encoun the direction of a State of callfo'nia registered geologist. '�Apnso I generated during the drilling Aeration drilling was completed by the field geologist{Appendix 11). a roved containers pending results of was stored on site in Department of Transportation {DOT) Pp s and all soil laboratory analyses. All downhole drilling equipment was steam cleaned between baring e quiment was steam cleaned between sampling runs to prevent crossoceacontatner�sand sampling g P ed into DOT-appy rinseate ger-,..-led during the steam cleaning operations were pump stored on site pending laboratory ana,ysis of the soil samples, 5.4 SOIL SAMPLING the Soil samples were collected from the soil borings at 5-foot ce. Say; rtes weretcollected during borings(20 feet),beginning at approximately 5 feet below ground slue alined with three 2 inch diameter by drilling usi tg a 2.5-inch O.D.modified California split-spoon same 6 inch long brass saield screening tools mple tubes. Odor,discoloration of soil,and a P D h ries were ssed as fubsequently sealed to wisess the presence of petroleum hydrocarbons;n the soil P ---------- ------... laced-.on_ice an insulated cooler. Based on PID screeningand visual _----- ------- and p --.. TECHNOLOGY-INC.