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e <br /> %✓ TASK 7 - ANALYZE EACH CAPILLARY ZONE SOIL SAMPLE <br /> One (1) soil sample from each boring will be analyzed at a CAI,EPA <br /> certified analytical laboratory for TPH-G, BTEX, and the fuel oxygenates <br /> MTBE, TBA, TAME, DIPS and ETBE by EPA Method 8260. The soil sample <br /> chosen for analysis will be the soil sample from each boring that appears <br /> to be the iT)ost contaminated based on odors, staining or OVM readings. <br /> 1f there is no indication of contamination in any of the borings; then the <br /> soil sample collected from the capillary zone will he analyzed. <br /> TASK 8 - DEVELOP THE MONITORING WELLS <br /> After waiting at least 72-hours following the well construction, ASE will <br /> develop the new pumping and monitoring wells using at least two episodes <br /> of surge block agitation and evacuation using pumps and/or bailers. <br /> TASK 9 - SAMPLE THE MONITORING WELLS <br /> ASE will collect groundwater samples from the monitoring wells after <br /> waiting at least 72 hours following the development of the monitoring <br /> wells. Prior to purging and sampling, ASE will measure the depth to <br /> groundwater and check for floating product in all site wells prior to <br /> purging water from :.any well. Any monitoring well which contains a <br /> measurable thickness of free-floating product will not be sampled. <br /> Prior to sampling, each well will be purged of at least four well casing <br /> volumes of groundwater. The temperature, pH and electrical conductivity <br /> of evacuated water will be monitored during the well purging. Purging will <br /> continue beyond four well casing volumes if these parameters have n o t <br /> stabilized. Groundwater samples will be collected from each well using <br /> disposable polyethylene bailers. Groundwater will be decanted from the <br /> bailers into 40-m1 glass volatile organic analysis (VOA) vials, preserved <br /> with hydrochloric acid and sealed without headspace. The samples will <br /> then be labeled with the site location, sample designation, date and time <br /> the samples were collected, and the initials of the person collecting the <br /> samples. The samples, will be placed on ice for transport to the analytical <br /> laboratory under chain. of custody. Purged groundwater will be stored on- <br /> site in sealed and labeled 55-gallon steel drums until off-site disposal can <br /> be arranged. <br /> 574 West Grand Line Road, Tracy, CA Workplan — April 2001 <br /> -]0- <br />