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<br /> <br />Table No. 12: Sampling Requirements <br />• Preservation Method Quantity <br />Permit <br />Application Baseline & Operational <br />Surface Water Ground Water <br />HNO3 to pHC2 1 Liter UNF 1 Liter UNF 1 Liter F <br />1 Liter F 1 Liter F~ <br />H2SO4 to pHC2 1 Liter UNF 1 Liter UNF 1 Liter F <br />Chill to 4 C <br />NaOH to pH>12 1 Liter UNF 1 Liter UNF 1 Liter F <br />Chill to 4 C <br />Chill to 4 C 1 Liter UNF 1 Liter UNF 1 Liter F <br />NaOH to pH>9 250 ml UNF <br />2.5 ml O.ln ZnAC2 <br />Chill to 4 C <br />UNF = Unfiltered <br />F = Filtered <br />* Sites 24, 25 & 31 only <br />• An inert gas sampler such as the Slope Indicator Co. Model <br />514124 is recommended for collection of monitor well <br />samples. The Sinco unit will easily fit in 2" diameter <br />casing. The unit should be fitted with SQ feet of tubing to <br />provide operational flexibility. A CGA 580 inert gas <br />regulator capable of 50-100 pounds pressure on the discharge <br />side is required. The Linde Model R-27-CF-580 Argon <br />regulator is recommended. A bottle of nitrogen or argon is <br />required to operate the sampler; the "Q" size cylinders <br />contain more than adequate gas for a sampling program and <br />are easily handled. Specifications and operating <br />instructions for the sampler are included in the appendix. <br />The system would cost approximately X500 er.cluding the gas <br />supply. <br />Prior to sampling, fluid should be withdrawn from the well <br />while periodically measuring the temperature, pH and <br />conductivity. When these values have stabilized fresh <br />formation water has been drawn into the well and the sample <br />can now be taken. Normally this requires the withdrawal of 1 <br />- 2 casing volume equivalents. The filling time of the <br />sampler can be significantly reduced when sampling under low <br />static head by connecting the sampler discharge tube to a <br />vacuum source, such as a vehicle engine intake manifold. <br />C~ <br />-26- <br /> <br />