WORK PLANS - Laserfiche WebLink

Home Browse Search

- _ ! Di Salvo Trucking Facility-GMT �" -.- September 27 1994 PP.ge-4- 3.2 Monitor Wells - I f petroleuri by� eFgns-are detected-i`n the`:H ropunch_grodndwater.�samP three monifd j �. . �_ — �ells•rtll-be con stracted.in a tranguYar pattern near the as# end of,the.,forner_locatlon , . .. _ - s. crwn in.Figure 2. Prior-to the commencement of field work, a permit to construct the monitor wells will be obtained from the SJCEHD and"the site will be. arked:for.the"location of underground utilities. I'he_monitor"well-boreholes-will-be-drilled-tiy ECal"ifarri�a'licenced duller under the' " up—ervisionof a-Condor geologist: , The.monitor well"vboreholes will'be drilled using 1"0-inch O.D., continuous-flight, hollow-stem augers to a total depth.of approximately 15-feet below th water table. The augers will be steam- cleaned ,prior to use. The.steam-cleanii-ig effluent.will be collected in 55-gallon drums, sealed, labeled, and left on site. Soil samples will be collected at five foot intervals-from each of the three monitor - wells.using a California-modified, split-spoon sampler fitted with three clean brass tubes. Prior to each sample collection, the split=spoon:sampler will be c aped is a solution of non-phosphate detergent and laboratory-grade, hydrocarbon-free water,_ d double-ri.nsed'with hydrocarbon-free water. .During.the sampling,`the split-spoon will be driven ahead of the augers. The.upper-most tube - will be discarded and the middle_ sample"tube will be used for geological logging. The bottom-most tube will be prepared for shipment to the laboratory. All soil samples will be screened in the_f..eld _ with an OVA. The hydrocarbon detection limit for the VA is approximately 1..0 part-0er million e"(including a sample from"tlie"capillary fringe) will be Two soil samples from-each borehol retained for laboratory analyses. The soil samples collet ed for laboratory analyses will be sealed at the ends with.Teflon tape, capped, wrapped"with duct to e, and labeled. The samples-will be stored - . for shipment in a cooler chilled with Blue Ice and delive d under chain-of-custody procedures to a state certified laboratory. The soil samples will be analy &using U.S. EPA and California approved methods under strict duality assurance measures.. The soil samples will be logged according to the Unified Soil Classification System under the supervision of"a geologist or engineer registered in the State of California. The geological.logs will - = include such field observations as soil type, estimated m isture content, presence of fuel product or odor and-.field OVA measurements. The,soil cuttings.:fr m„-ea ch monitorr�well'bering_will`be:placed an and covered”with iashc. heetir, andileft on stte pe.ding.iaboratoryzresuits. Disposal of = —. ._ _ - P_ g hazardous materials, if any,'will be the responsibility of Di Salvo Trucking. - - L� — CONDOR. ..