Laserfiche WebLink
- <br />. <br /> SROUND-WATT „ATON1TnRiNG ANDAND SAMPING PR O URES <br /> Prior to sampling,the depth to water was measured in all monitoring wells using an electronic immersion probe. <br /> All measurements were read to the nearest 0.01 foot. If free product was present,the depth to free product and <br /> the depth to water was measured using an interface probe and an observation sample was collected with a clear <br /> teflon bailer for confirmation. No analytical samples were collected from monitoring wells containing more <br /> than 0 25 inch of free product. <br /> �. The monitoring wells were sampled on December 14, 1989, prior to purging,each well was checked wLi a clear <br /> teflon bailer in order to observe the possible presence of floating hydrocarbons. Purging was accomplished using <br /> a stainless steel or teflon bailer. The bailer was thoroughly cleaned prior to each sampling using a trisodium <br /> re.4 phospha.e solution followed by a 10% methylalcoho'4 solution, and then rinsed twice with potable water. The <br /> i a walls were purged prior to sampling until pH,conductivity, and temperature values stabilized. Generally, this <br /> resulted in the removal of approximately 3 to 5 well volumes of ground water from each well during the purging <br /> process. The water obtained from purging was placed in labeled 55-gallon drums and s tired op.-ste. Thr,bailer <br /> [? line was replaced after each sampling. Samples recovered from each well were decanted into 11,Y�l_p <br /> Yrc,ipriately <br /> prepared and labeled 40-m1 volatile organic analysis(VOA) bottles. A travel blank(numbered ics MW-26)and <br /> s a duplicate sample from MW-16 were also submitted for quality assurance. The sample bottle„were immediately <br /> placed in an ice chest and maintained at 4•C until delivery to a State of California licensed laboratory. Routine <br /> chain-of-custody procedures were employed. <br /> Is - <br /> tra <br /> Bn Pont Environmejitn,l Services A-1 <br />