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groundwater. One additional soil sample will be collected at each site <br /> and assessed for soil permeability and general minerals to aid in <br /> remediation planning. <br /> Groundwater samples from UST Site 517 will be analyzed for TPH- <br /> diesel and TPH-gasoline by USEPA Method 8015 (Modified) and for <br /> BTEX by USEPA Method 602. In addition to the analyses mentioned <br /> above, groundwater samples from UST 816D and Sumps 617 and 816D <br /> will be analyzed for VOCs, SVOCs, and PCBs. Field-filtered <br /> groundwater samples will also be analyzed for total lead by USEPA <br /> Method 7421. One sample at each site will be analyzed for general <br /> minerals, iron, and magnesium, which will assist in remediation <br /> planning. In addition to the groundwater analyses mentioned above, <br /> any monitoring well which can supply more than 200 gallons per day <br /> should be analyzed for total dissolved solids (TDS). <br /> Methods of preparation and analysis of the principal soil and <br /> groundwater samples are summarized in Table 2 along with the target <br /> detection limits. <br /> Decontamination Procedures <br /> The purpose of decontamination and cleaning procedures during <br /> drilling, monitoring well installation, and sampling tasks is to prevent <br /> chemical contamination of the samples and cross-contamination <br /> between locations and sites. Before use, all sampling and drilling <br /> equipment will be decontaminated by steam cleaning or, alternatively, <br /> by washing with a non-phosphate detergent such as Liquinox or its <br /> equivalent. A double tap water rinse and single deionized water rinse <br /> will follow the detergent wash. <br /> Purge Water Containment and Disposal <br /> The water from well development, purging, and decontamination <br /> procedures will be stored on site in labeled 55-gallon drums pending <br /> results of groundwater analyses. All drums will be marked clearly with <br /> labels stating date of collection and the phrase "Pending Analytical <br /> Results." If BTEX concentrations in the groundwater are in excess of <br /> the Maximum Concentration Levels (MCLS) for California Drinking <br /> Water Standards, the drummed water will be treated and/or disposed <br /> of in accordance with applicable state and local regulations. If the <br /> collected water meets the requirements of General Order 91-25000 for <br /> the discharge of waste water, a report of waste discharge (RWD) will be <br /> filed with the RWQCB. Upon approval of the RWD, the waste water <br /> will be dispose of appropriately. <br /> 4-10 <br />