Laserfiche WebLink
Unified joJl Classification System. Descriptions of soil_9 <br /> encountered and monitoring well construction details will be <br /> recorded on boring/well logs and included within the <br /> assessment report. Soil samples will be collected from each <br /> boring at five foot intervals. The samples will be <br /> collected using a "'wo-inch diameter by 18-inch long split <br /> Spoon sampler lined with 6-inch long thin-walled brass <br /> tubes. The sampler will be driven its entire length into a <br /> undisturbed soil by a 140-pound drop hammer. Sample j <br /> collection will begin at a depth of five feet. No samples <br /> will be collected for laboratory analysis below the water <br /> �. table. <br /> Soils encountered will be monitored for organic vapors by <br /> ,tea placing a small amount of representative material in a <br /> sealed container, then measuring the concentration of <br /> ' volatiles collected in the head space with a photoionization <br /> detector (PID) calibrated to the benzene molecule, as well <br /> as using olfactory detection. The values obtained at each <br /> measurement point will be recorded on the boring logs. <br /> Soil cuttings generated during the drilling process will <br /> also be screened for the presen-Ne of volatile organics using <br /> r the above methods. <br /> Soil samples submitted for analysis will be selected based <br /> x on lithologic observations and obvious signs of <br /> contamination (i .e. PID readings, odors, and/or soil <br /> w discoloration) . At a minimum, the06—; sample collected <br /> immediately above the water table will be submitted for <br /> laboratory analysis. <br /> rx <br /> Samples will be collected, preserved, and transported under <br /> chain-of-custody in accordance with WaterWork ' s Quality <br /> Assurance/Quality Control (QA/QC) Plan (Appendix II ) . <br /> Select samples will be analyzed for benzene, -toluene, <br /> a� ethylbenzene, and xylenes (BTEX ) and total petroleum <br /> hydrocarbons as ge zni ine (TPHG) by appropriate EPA and <br /> methods. Applied Analytical DHS <br /> {CA certification No. 1211 ) <br /> will perform the analyses <br /> Soil cuttings will be placed on and covered with 6 mil <br /> Plastic on-site. Soil cuttings and groundwater will, be <br /> properly disposed of in a timely and appropriate manner <br /> after reviewing the analytical results and obtaining agency <br /> approval. The storage area will be posted with a sign <br /> indicating the source and contents of each pale or drum. <br /> Groundwater will be monitored in accordance with WaterWork►$ <br /> QA/QC Plan. A survey mark tied to a common datum will be <br /> established on each wellhead for determining groundwater <br /> gradient direction. Surveying will be performed under the <br /> direct supervision of a California Registered Civil <br /> Engineer. Groundwater Contours will be constructed using a <br /> kriging program. <br /> 6 <br />