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W1, S -1 ERNGr; OI_ oGlc Rl: Soulzct, S , INC E Rathfr/9 May 1990 3 located at the eastern edge of the properly and boring B-7 is located on the northeast corner of the Port of Stockton food site located west of the API site The location of the soil borings may have to be adjusted according to accessibility and tindt rground utilities or obstacles Soil samples will be collected from the borings at approximately 5 foot (ft) intervals for lithologic and hydrogeologic characterization and for possible chemical analysis Collection of soil samples from boring 13-5 may not be possible because of the restrictions on equipment clearance, imposed by the, roof of the WWI building Soil samples will be screened in the field using a photolonvation detector (PID) to qualitatively determine if volatile hydrocarbons are present Soil samples will be sent under chain-of- custody to a state-certified laboratory Soil cuttings will be stored on-site in a containment bin Appropriate disposal will be determined based on analytic results MONITORING WELL INSTALLATION AND DEVELOPMENT PROCEDURE The WGR standard operating procedure for installing and developing groundwater monitor wells is included in Attachment B The soil borings, B-5, B-fi and B-7, will be completed as 2-inch diameter monitor wells, MW-5, MW-6 and MW-7, respectively Figure 3 of Attachment A presents general well construction details For each well the screen will extend 20 fl into the first water-bearing zone or the screen will terminate at the upper extent of a lower confining unit, or aquitard The wells will be developed by methods appropriate to the subsurface conditions to provide representative groundwater samples r MONITOR WELL PURGING AND GROUNDWATER SAMPLING PROCEDURE s The WGR procedure for purging and sampling groundwater monitoring wells is included in Attachment B Three well-casing volumes of groundwater will be purged from each well and the well sampled with a steam-cleaned PVC bailf-r The groundwater samples and a travel blank, consisting of laboratory-supplied deionized water, will be sent under chain-of-custody to a state-certified laboratory The purge water will be temporarily stored on-site in 55-gallon drums pending laboratory analysis ANALYTIC LABORATORY Soil and groundwater samples will be sent to Coast to Coast Analytical Services (CCAS) of San Luis Obispo, California,a state-certified laboratory All soil samples selected from borings B-5 through B-7 and groundwater samples from wells MW-1 through MW-7 will be analyzed by EPA Method 8260 for 006LIAPO WP T6� •1, n.M.