Laserfiche WebLink
1 <br /> 3.1.3 Ground-Water Sampling Rationale <br /> Ground-water monitoring wells will be used (1) to measure ground-water contamination both <br /> in the dissolved phase and as floating free product and (2) to verify the site-specific hydraulic <br /> ' gradient One upgradient monitoring well, one downgradaent well, and up to four additional <br /> contaminant delineation wells will be installed The downgradaent monitoring well will be installed <br /> ' within close proximity of the downgradaent edge of the tank excavation as suggested by RWQCB <br /> guidelines (TRI Regional Guidelines, August 1990, with Appendix A, August 1991), and the <br /> ' upgradient monitoring well will be installed south of the former UST, based upon water levels <br /> reported by Kleanfelder (1988) The contaminant delineation wells will be located based upon field <br /> screening results <br /> 1 <br /> I <br /> I <br /> ' 3.2 ANALYTICAL METHODS <br /> I <br /> ' UST 81713-2 was used to store leaded gasoline Soil samples collected during the <br /> investigation will be analyzed for BTEX, TPH as gasoline, and Waste Extraction Test (WET) soluble <br /> lead Groundwater samples will be analyzed for BTEX, TPH as gasoline, and total lead Analysis <br /> will be performed by a California hazardous waste certified and Navy CLEAN-approved laboratory <br /> ' Table 2 summarizes the analytical methods for soil andground-water <br /> yt samples to be obtained <br /> ' during the site field investigation <br /> ' 3.3 FIELD METHODS AND PROCEDURES <br /> ' Field methods and procedures discussed below serve as guides for individuals performing the <br /> field work Site-specific field methods and procedures are based on standard operating procedures <br /> ' This section includes information on procedures for soil gas, soil, and ground-water sampling, well <br /> surveying, well development, well purging, decontamination procedures, sample handling, and quality <br /> ' assurance/quality control (QA/QC) field sampling <br /> I <br /> I <br /> i SAMPL"162 <br /> oaa.m6zvrArw.a9nsrz 1 i <br /> I <br /> I <br /> 1 <br /> I <br />