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Draft Workplan for Aerially Deposited Lead Testing BCI No. 1399 3 <br /> Buena Vista Rancheria Phase I-Off-site Road Improvements August 19,2010 <br /> Amador and San Joaquin Counties. California <br /> • Approximate sample locations axe shown on attached Figures 2 through 4.. Final <br /> .locations will be adjusted based on accessibility and utility conflicts in the field.. <br /> • Sampling will be performed within 5 feet of the existing edge of pavement in the various <br /> improvement areas <br /> • Three discrete samples(0 to 4"), (6 to 12')and(18 to 24')below ground surface will be <br /> collected from each ADL sample location. Samples will be collected using hand augers <br /> and hand sampling equipment.. If in-place,generally impermeable,moderately <br /> weathered rock is encountered before the maximum sample depth is reached,a sample <br /> will be collected from the material immediately above the rock and the boring will be <br /> terminatred at a depth less than 24" For this case it will be presumed that ADL did not <br /> migrate into the native rock. <br /> • Sampling equipment will be cleaned between each sample location by washing with an <br /> Alconox solution followed by rinsing with potable water and a second rinse using <br /> deionized water. <br /> • ADL soil samples will be transferred into Ziploc resealable plastic bags and <br /> homogenized within the bag. I <br /> • The bags will be labeled,placed in a cooled ice chest,and delivered to a California <br /> certified analytical laboratory under-chain-of-custody documentation <br /> • Borings will be backfilled with excess cuttings.. Wash and rinse water will be discharged <br /> to the ground surface at the sample locations <br /> i <br /> LABORATORY ANALYSIS <br /> • All samples will be tested for total lead(EPA Method 6010B) Samples with the highest <br /> total lead concentration and above 50 ppm total lead will be tested for soluable lead <br /> using the WET procedure and EPA Method 6010E analysis. However,the total number <br /> of samples tested using the WEI'test will not exceed 30%of the total samples collected. <br /> Samples with WET results exceeding 5 0 mg/l will be subject to further testing using <br /> WET-DI and TCLP analysis as appropriate Approximately 10%of the ADL samples <br /> wi.Il be randomly selected for pH testing(EPA Test Method 9045). <br /> • Laboratory quality assurance will consist of method blanks,duplicate samples, and <br /> spiked samples.. <br /> REPORT <br /> • BCI will review and analyze the sample data, and prepare a dry report of the test <br /> results. We will submit the draft report to relevant members of the project team.. Once we <br /> receive review co,mrnents,we will finalize the report incorporating the review comments, <br /> and prepare a Final Summary Report. <br /> f <br />