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Field Report Water Sampling Former Laura Scudder's Tracy Facility 100 W. Valpico Road Tracy, California. On April 2, 1990 and May 2, 1990, ROY F. WESTON, INC. (WESTON) collected groundwater samples from the monitoring well located at the former Laura Scudder's plant site. The monitoring well is situated in the vicinity of the previously removed underground fuel storage tank designated T-2. The purpose of this sampling was to assess the potential presence of petroleum hydrocarbon compounds in the site groundwater. All on-site work was observed by Mr. Greg Lyons representing the Environmental Health Division of Public Health Services in San Joaquin County. For both sampling periods, the depth to water in the monitoring well was measured and the total well depth was verified prior to the collection of the water sample. Using these measurements, the volume of the standing water in the well and the required purge volume were calculated and recorded on a standardized well sampling log sheet. A copy of these logs are included in this report. Prior to purging of the well, a sample of the standing water was collected with a teflon bailer lowered on monofilament line. This water sample was stored with ice in an insulated chest pending transport to the laboratory and submission for analysis for Total Petroleum Hydrocarbons (diesel) by EPA Method 8015E. The well was then purged, again using a teflon bailer lowered into and retrieved from the well using new, clean monofilament line. At the beginning of the well purge, the pH, temperature, and specific conductivity of the water was measured and recorded. These measurements were again taken at the end of the purge. The purge removed three standing well casing volumes. A record of the purge activities, including the volume of water purged, the start and finish time of- purging was maintained on the sample log sheet. Table A-1 summarizes the data collected at the time of purging. Purge water was containerized by adding it to the barrels already present on- site which contain soil cuttings from the drilling of the monitor- ing well as approved by the County representative. Once the well had been purged, a water sample was collected as described above using a teflon bailer lowered into the well with new, clean monofilament line. Water collected in the bailer was F=A poured directly from the bailer into laboratory prepared sample bottles. This second sample was submitted for analysis of benzene, toluene, xylene and ethylbenzene by EPA Method 602. - ---- -----