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,�apr��.°.'�_r�' -�_ _ -�_��• .�:: ..mss :�� �' .�+� _ <br /> Y•" � �, 'L�_ �� ri*rw lk'i .:R. n ax.� <br /> 4' <br />.h i <br /> 99 <br /> PRELIMINARY REPORT <br /> j Mcreland Court Shell <br /> 7 Stockton,California <br /> Delta Protect No.40488-146 <br /> Page 11 <br /> { 3.0 PROPOSED WORK PLAN <br /> I 1 <br /> Delta proposes to install three grovind water monitoring wells aad two soil borings using 10-inch-diameter <br /> t hollow-stem augers. Soil samples will be collected at 5-foot intervals. Proposed monitoring well and soil <br /> a boring locations are shown in Figure 2. <br /> J <br /> 3.1 Soll Sample Collection and Screening <br /> f -A A California modified split-barrel sampler will be used to extinct the soil samples from the soil borings. <br /> l Three 6-inch brass tubes will be inserted into the California sampler to retain the soil samples. Upon <br /> pj retrieval, one brass tube will be capped, packaged, and placed in a sealed jar until completion of the <br /> I :M drilling activities. The samples placed in jars will be brought to room temperature, and the headspace <br /> of each jar will be screened for total organic vapors utilizing a PID with a 10.2 eV Iamp calibrated to <br /> J benzene for direct reading in parts per million. Refer to Appendix D for sampling and screening methods. <br /> • (fed .�. <br /> F ( 3.2 Monitoring Well installation <br /> ~� The purpose of the monitoring wells is to determine if ground water contains petroleum hydrocarbons. <br /> Monitoring wells will by installed by drilling a 10-inch-diameter borehole to approximately 10 feet below <br /> } the water table and installing 15 feet of 4-inch-diameter flush-threaded,No. 20 slot, polyvinyl chloride. <br /> (PVC)screen,and approximatcly 25 feet of flush-threaded blank. The screened interval will be backfilled <br /> with No. 3 Monterey sand to a point approximately 2 feet above the screened interval; a 2-foot-thick <br /> bentonite seal will be placed above the sand. The remaining hole will be demented, and a flush-grade <br /> steel pmtectivre casing will be installed at the ground surface to provide a secure wellhead. Typical <br /> monitoring well details are shown in Figure S. <br /> 3.3 Chemical Any?_ s <br /> a r Selected soil samples collected from the soil borings,and ground water samples from the monitoring wells <br /> - s <br /> �+ will be sent to a California-certified Iaboratory for chemical analyses. The samples will be analyzed for <br /> t BTEX by EPA Method WW,and TPH as gasoline by EPA Method 8015, modified. <br /> j <br /> 4.0 SCHEDULE <br /> As soon-as approial-is obtained,-Delta will-proceed with-the-work outlined-in this-plan.Drilling-and- - ---- - — - <br /> a installation of the monitoring wells will be initiated within 3 weeks of approval. A summary report of the <br /> E f results, including information on site geology,ground water depth, monitoring well construction details, <br /> 4V. <br /> iw 5 <br /> { <br />