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City of Stockton A68104 OIA <br /> October 25, 1995 Page 4 <br />' Soil samples collected at 3 feet BSG in soil boring B-1, at 20, and 25 feet BSG in MW-1, <br /> and at 10, 15 and 20 feet BSG in soil boring B-2, and at 15 and 20 feet BSG in soil boring <br /> B-3 were selected for laboratory analysis <br /> After completion of the soil sampling, the soil borings were backfilled with a Portland <br />' cement slurry The slurry was gravity placed through the annulus in the hollow-stem augers <br /> Backfill was placed in one continuous operation from the bottom to the top of the borehole <br /> When the annulus filled with the slurry, auger flights were removed (no more than 10 feet <br /> at a time) from the borehole, allowing the slurry to uniformly fill the borehole to the <br /> surface. <br /> Soil cuttings and decontamination rinsate generated during the drilling operations were <br /> stored on site in Department of Transportation(DOT)-approved, sealed, 55-gallon drums <br /> Final disposal/treatment of these materials is the responsibility of the client <br />' 4.1.2 Groundwater Monitoring Well Installation Development, and Sampling <br /> Monitoring well MW-1 was constructed of 2-inch diameter, Schedule 40 polyvinyl chloride <br /> (PVC) well casing The well screen was installed between the depths of approximately 40 <br /> and 20 feet BSG A monitoring well construction schematic for monitoring well MW-1 is <br /> presented as Drawing 4 <br /> Monitoring well MW-1 was developed on June 29, 1995 to remove fine-grained sediment <br /> and to settle the sand filter pack The monitoring well was developed consistent with the <br /> SOPs outlined in Appendix A Monitoring well MW-1 was sampled on June 30, 1995, <br /> (greater than twenty-four hours after development) and on September 26, 1995 <br /> Groundwater sampling was conducted consistent with the SOPs outlined in Appendix A <br /> Purge water generated during groundwater development and sampling was containerized in <br /> DOT-approved steel drums These drums were stored on-site Final disposal/treatment of <br /> these materials is the responsibility of the client <br /> 4.2 Laboratory Testing Program Benzene, toluene, ethylbenzene, and xylenes (BTEX) <br /> and TPH-G were used in the laboratory testing program as indicator parameters <br /> Preparation and analytical methods for the laboratory analyses are summarized in Table 1 <br /> 1 <br />