ARCHIVED REPORTS XR0012562 - Laserfiche WebLink

Home Browse Search

01 meff"07WIFEr e: M___ k Texaco Environmental Services September 12, 1991 02320 1700 Page 3 i Prior to any activities on the subject site, a permit for monitoring well installation will be obtained from the SJGPHS-EHD, Additionally, Underground Service Alert(USA)will be notified 48 hours in advance of the start date. 3.2 SOIL BORINGS All soil borings for monitoring wells wou:d be drilled with a truck-mounted drill rig, using 10-Inch outside diameter(O.D.)hollow-stem augers. A field geologist would supervise th3 drilling,and continuously log the soils encouidered in accordance with the Unified Soil Classification System. Soil generated during drilling operations would be placed on plasitL,sheeting and covered. The plastic-wrapped soil would be left on site for disposal at a later date, pending the results of laboratory analyses. Locations of the proposed soil borings and monitor.ng wel:s are shown on Figure 2(Appenarx A), Underground utility information is not presep'1y available,and will be Included In future reports. 3.3 SOIL SAMPLING Soil samples would be collected with a 2.5-inch O.D., split-spoon sampler, lined with three 2-inch diameter by&inch long brass sample tubes, Samples would be collected at 5400t intervals by driving the sampler IS inches ahead of the augers at each sample mint. The retained samples would then be sealed, labeled, and placod on Ice In an insulated container for delivery to an analytical laboratory for analyses. Appropriate chain-of-custody forms wouk:be maintained with the samples at all times. An initial screening of the soil samples for hydrocarbon constituents would be conducted In the field, using a photolonization detector(PID). PID readings world be used in conjunction with field observations (i.e., odors)to select samples for laboratory analyses. The soil samples would then be analyzed for BTEX and TPH-G by Environmental Protectlzn Agency(EPA) methods 5030/8020 and 8015, 3.4 MONITORING WELL CONSTRUCTION A monitoring well will be Installed In each borehole. The monitoring yells will be constructed with 4-hch diameter,0.020-inch-slot,:.chedule 40 polyvinyl chloride(PVC),threaded well screen and casing. Th; annular space will be packed with No. 2/12 lapis Lustre sand or the equivalent, and a surface seal of bentonite and cement grout. Each wellhead will be protected by a locking cap and a traffic-rated street box with a water-tight bolted lid(Figure 4,Appendix A). Specific construction details,such as screen and sand pack Intervals, will be determined In the field based on the depth to first-encountered water. .C�.GROUNDUATFR iroowKvLaar TECHNOLOGY,INC.