Laserfiche WebLink
1534 Willow Pass Road,Pittsburg,CA 94565-1701 <br /> 0 MCCAM PBELL ANALYTICAL INC. Telephone:925-252-9262 Fax:925-252-9269 <br /> W "When Quality Counts" <br /> O www.mccampbell.com:main@mccampbell.com <br /> 3.2.2 A 2.24-liter Helium (99.995%) cylinder with a regulator set at 10 psi. Check the pressure gauge on <br /> Helium tank prior to sampling. If the pressure gauge reads less than 100 psi, then the Helium tank <br /> must be replaced. <br /> 3.2.3 A superior Helium meter, which measures Helium/Oxygen concentrations from 0%to 100%with± <br /> 0.1% accuracy. The connection ports on the helium meter have been labeled for your convenience. <br /> A fully charged Helium meter should last up to 10 hours. *Note: To obtain an accurate reading on <br /> the Helium meter, the sampler must use the 60 mL syringe and give a quick pull on the plunger. <br /> (Pulling 60 mL of air through within a second is sufficient.) <br /> 3.2.4 The 60mL syringe is used to provide suction and force the airflow through the Helium meter or to <br /> quantify the "purged volume" <br /> 3.2.5 One Sensidyne pump set at 1250mL/min for maintaining a stable 20 %(±2%)Helium concentration <br /> in the shroud. <br /> 3.2.6 One 6-liter purge canister with Rota meter attached as suction/evacuation source for leak testing, <br /> well purging and a check for low permeability soils. <br /> 3.2.7 Cork shroud stabilizers of various sizes are included to level/stabilize the helium shroud. <br /> 3.2.8 An additional 1-liter sample canister can be provided for the optional TO17 sampling in order to: <br /> 3.2.8.1 To provide vacuum to pull sample through. <br /> 3.2.8.2 To allow calculation of the volume pulled through. <br /> 3.2.8.3 Analyze for Helium as a leak check compound <br /> Note: The helium shroud may be reused for multiple borehole sites. However, due to potential cross <br /> contamination between borehole sampling, each borehole tested requires a separate certified 1-liter sample <br /> canister and certified sampling manifold.As there is no helium shroud tubing that contacts the sample upstream <br /> of the manifold;all Teflon tubing is reused. <br /> 4. Sampling Media <br /> 4.1 MAI's sampling manifold,which includes the following: <br /> 4.1.1 3-way valvel on the borehole side of the manifold. The tapered end of the valve points to its <br /> connection direction. <br /> 4.1.2 A stainless steel 7-micron particle filter. <br /> 4.1.3 Vacuum gauge#1 reads the borehole side pressure. <br /> 4.1.4 A stainless steel flow restrictor. <br /> 4.1.5 Vacuum gauge#2 reads the sampling canister pressure and indicates when to stop sampling <br /> 4.1.6 Optional split sample attachment. <br /> 4.1.7 2-way valve turns on/off the access to the purge can. <br /> 4.2 A 1-liter certified sample canister <br /> Page 4 of 9 <br />