ARCHIVED REPORTS XR0012594 - Laserfiche WebLink

Home Browse Search

r Mr. Michael J. Infurna January 9, 1992 Page 2 0 Measure water levels in all wells(NNW-1 through MW-6). • Collect ground water samples from monitoring wells MW-4, MW-5, and MW-6 for laboratory analysis. • Submit ground water samples to a California-certified laboratory for chemical analysis of BTEX and TPH as gasoline. 6 Prepare a report with our findings. Soli ]brines.5011 Sample Collection arrd Screening Three soil borings are proposed at the locations shown in Figure 2. Each boring will be advanced to a depth of approximately 30 feet below the surface. Soil samples will be collected at approximately 5-foot intervals with a California-modified split-barrel sampler. A representative ned icor organic vapors using a PID calibrated to hexane. The portion of each sample will be sere, r` soil sample with the highest PID readitig and the soil sample collected just above the static ground water level will be submitted for laboratory analysis. These soil samples will be submitted for laboratory analysis to determine t-r;e concentration of BTEX and TPH as gasoline. Soil s?mploa will be classified according to the unified Soil Classification System (USCS) and described en tete logs with any pertinent information about the drilling methods or conditions encountered. Monitpring Wells and Ground Water Sampling Ground water monitoring wells MW-4, MW-5, and MW-6, will be installed in the corresponding borings shown in Figure 2. A detail of the proposed monitoring well construction is presented in Figure 3. The cement-bentonite sea'placed in the annular space between the monitoring well casing and the borehole will be tremied. Following installation,each well will be daveloped with a bailer or pump. After developing each well, a gr(.und water sample will be collected and submitted for laboratory analysis to determine the concentration of BTEX and TPH as gasoline. All field work performed at the site by Delta including the methods used to drill and sample soils and ground water, the analytical procedures, and quality assurance and quality control are presented in Enclosure A. The site Health and Safety.Plan that will be used by field personnel conducting work at the site is also presented in Enclosure A. Schedule Delta is currently working with the City of Stockton Public Works Department, to obtain an encroachment permit to install the proposed monitoring wells on the city right-of-way. As soon as the encroachment permit is obtained from the City of Stockton, a copy will be forwarded to your office.