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N Vicky McCartney Q <br /> San Joaquin Comity Environmental Division �dw''NU10 <br /> 4 November 2004 <br /> Page 3 <br /> In addition to the borings, three 6- to 10- foot deep test pits will be excavated inside the building; <br /> one along each of the former product lines, and one at the pump island. Up to three soil samples <br /> will be collected from each test pit for analyses. Soil in the test pits will be screened for organic <br /> vapors using a PID . Advancing test pits in this area will facilitate better observation of <br /> subsurface conditions, and enable sampling over a larger area than soil borings would allow. <br /> Borings will be advanced using a direct push drilling method method. Temporary casing and <br /> screens will be used at all locations proposed for groundwater sampling. Groundwater samples <br /> will be collected from the temporary well casing using disposable polyethylene bailers. A <br /> backhoe with a concrete breaker will be used for test pit excavation, and the holes will be <br /> backfilled with excavated soil after sampling. The sampling, equipment decontamination and <br /> sample handling procedures shall be performed in accordance with SJECHD requirements and <br /> standard industry practices , <br /> Immediately after collection, samples will be labeled, and placed in an iced cooler. All samples <br /> will be submitted to a California state certified laboratory for analysis using chain of custody <br /> protocols . Groundwater samples will analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg) using EPA Method 8015M and for benzene, toluene, ethylbenzene, xylenes (BTEX) and <br /> fuel oxygenates using EPA Method 8260B on a 5-day turn-around. Previous groundwater <br /> samples have been analyzed using EPA Method 8020 for BTEX compounds, which the Regional <br /> Water Quality Control Board (RWQCB) has stated can report false positive or elevated <br /> concentrations of benzene in groundwater at sites with degraded gasoline releases. Soil samples <br /> will be analyzed for TPHg and BTEX using EPA Method 8015M. Additionally, soil samples <br /> from the test pits will be analyzed for total lead using EPA Method 6010. <br /> All waste soil, groundwater and decontamination water generated during this investigation will <br /> be stored on site in drums pending analytical results. All borings will be closed by pressure <br /> grouting in accordance with the requirements of the SJCEHD. <br /> SCHEDULE <br /> As soon as the Work Plan and boring permit are approved we will proceed with the proposed site <br /> investigation. If you have any questions regarding this Work Plan please call. <br /> 1� ED <br /> Sincerely, y alp ` <br /> TREADWELL &/ROLLO, ��+ocNa <br /> � No. 7066 <br /> David G. Dixon,j " N� 4a ith, CPGS � <br /> Senior Project Manager 9� FC A�tfp Principal <br /> 25971101 .DGD <br /> Attachments : Boring Permit Application <br /> Figure 1 - Site Location Map <br /> Figure 2 - Site Map <br /> cc : Mr. Jay Coffey - City of Stockton <br />