Laserfiche WebLink
Upon completion, all borings will be grouted to the surface using a sand/cement slurry. All waste grout, <br /> soil,and drill cuttings will be collected, contained, labeled,and stored for later disposal (see Waste Disposal <br /> Plan). <br /> PHASE II - GROUND WATER ASSESSMENT <br /> If the results of the soil survey indicate that products extend to ground water, the site investigation will be <br /> expanded to include a ground water assessment. Initially the assessment will involve installing, developing, <br /> and sampling one monitoring well located adjacent to the discharge line (see Figure 2.) If the results of the <br /> ground water sampling indicate that elevated levels of petroleum hydrocarbons and/or glycol compounds <br /> are present in ground water, additional monitoring wells will be installed at the station. These wells will be <br /> used to characterize ground water quality and determine hydraulic gradient beneath the facility. Actual <br /> monitoring well locations will be determined based on assumed hydraulic downgradient direction and site <br /> conditions. Monitoring well installation procedures are outlined in Appendix C. <br /> The proposed monitoring wells will be screened from 3 to 5 feet above the water table to 10 feet below the <br /> water table, in the upper part of the saturated zone. This screened interval should allow for the <br /> determination of the presence of any floating product, permit a representative water sample to be taken, <br /> and accommodate any fluctuations of the water table. Top of casing elevations for all monitoring wells will <br /> be surveyed to a common datum to the nearest 0.01 foot. The depth to water will be measured, using an <br /> electric immersion probe, to an accuracy of 0.01 foot. <br /> Ground water samples will be taken according to the procedures outlined in Appendix D. The water samples <br /> will be placed on ice and delivered within 48 hours to Eureka Laboratories, Inc. for analysis. Selected water <br /> samples obtained from the wells will be analyzed as follows: TPH as gasoline (EPA Method 8015); BTEX <br /> (EPA Method 602); and glycol (Method GC-FID). <br /> 462891/42/PPU26 5-2 <br />