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- y <br /> Mr.Michael J.Infurna <br /> San Joaquin County Environmental Health Depariment <br /> August 14, 1991 <br /> Page.2 <br /> Soil Borings,Soil Sam ie Collection and Screenin <br /> Three soil borings are proposed at the locations shown in Figure 2. Each boring will be advanced to <br /> a depth of approximately 35 feet below the su*face. Soil samples will be collected at approximately <br /> 5-foot intervals with a California-modified split-barrel sampler. A representative portion of each sample <br /> will be screened for organic vapors using a photoionization detector(PID)calibrated to hexane. The <br /> soil sample with the highest PID reading and the soil sample collected just above the static ground water <br /> Ievel will be submitted for laboratory analysis. These soil samples rr6ll analyzed to determin;: the <br /> concentration of benzene, toluene, ethylbenzene, xylene, (B P"EX),ar3 total petroleum hydrocarbon <br /> (TPH)as gasoline. Soil samples will be classified according to the Unified Soil Classification System <br /> (USCS) and described on the logs with any pertinent information about the drilling methods or <br /> conditions encountered. <br /> Monitoring Wells and Ground Water Saber <br /> Ground water monitoring wells MW-1.MW-2,and MW-3 will be installed in the corresponding boring's <br /> shown in Figure 2. A detail of the proposed monitoring well construction is presented in Figure 3. The <br /> cement-bentonite seal placed in the annular space be"een the monitoring well casing and the borehole <br /> will be tremied. Following installation, each well will be developed with a bailer or purrip. After <br /> developing each well,a ground water sample will be collected and submitted for laboratory analysis to <br /> determine the concewra!ion of BTEX and Ti:H as gasoline. All field work perform el at the site by <br /> Delta including the methods used to drill and sample soils and ground water,the analytical procedures, <br /> and quality assurance and quality control are presented in Enclosure A. The site Health and Safety Plan <br /> that will be used by field personnel conducting work at the site is also presented in Enclosure A. <br /> Schedulr_. <br /> Delta will*-roceed with work outlined in this plan as soot:as possible.:A drilling crew is scheduled for <br /> the week of,August 19,1991. If you foresee any delays in approval of this work plan,please contact me <br /> at(916)638.2085. <br /> Sincerely, <br /> DELTA ENVIRONMENTAL CONSULTANTS INC- <br /> Hal E. Hansen <br /> praierf Monaarr/Hvdroecologist �. <br /> Martin S.Burck,R.G. f <br /> Hydrogeologist <br /> OF CkUv <br /> HEH:MSB:ta <br />