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• WATER SAMPLES <br /> The new monitors wells will be sampled approximately 72 hours after <br /> development along with the pre-existing wells. <br /> METh0DS AND PROCEDURES <br /> Using a resistance probe, WEGE personnel measured the depth to <br /> water prior to sampling each well. Product thickness is then <br /> measured using a cleaned, clear bailer. A fresh bailer is used <br /> for each well. These special bailers are designed and built by <br /> WEGE to recover the exact product thickness. If no product as <br /> present in the well a water sample is collected. <br /> The well is purged before collecting water samples. This is <br /> accomplished by pumping at least four well volumes from the well. <br /> PurgLag is continued until the water quality parameters <br /> (temperature, pH, and conductivity) stabilized. Water produ,:;ed <br /> from the well during the purging process is collected in a 55- <br /> gallon drum. <br /> x <br /> The well is allowed to recover after purging. A water sample is <br /> then collected with a fresh bailer. Each sample is divided among <br /> four 40-m1 vials. The vials are supplied by a chemical supply <br /> company and are pre-cleaned to exact 'EPA protocols. The saaple <br /> vials were labeled as to station, well, time and sampler, and <br /> documented on the chain-of-custody sheet. They were then placed <br /> into an ice chest and cooled to 4[C with ice. The samples are then <br /> hand delivered to a California State Certified Lab and signed over <br /> to the lab using standard chain-of-custody procedures. <br /> HEALTH AND SAFETY <br /> The borings will be continuously monitored with a Photoaonizing <br /> Detector (PID) along with periodically monitoring the site and <br /> work area. All personnel involved with this site have a current <br /> OSHA-SARA Certificate of Training, see Appendix E-Health and <br /> Safety Plan. The site, until found otherwise, is being treated as <br /> class D. <br /> We wash to start drilling these wells during the week of July 23- <br /> 27, 1990. Your expediting our permits is greatly appreciated. <br /> Sincerely yours, j <br /> 'W--lir <br /> Geor L. Converse Jack E. Nr3.. t <br /> Project Geologist CA. REG. #3037 <br /> cc: Mr. John Margowski, Wickland Properties <br /> Mr. Tom Peltier, RWQCB-Central Valley Region <br /> • <br />