Laserfiche WebLink
Mr. Alan M. Buehler <br />Central Valley Regional Water Quality Control Board <br />April 5, 2017 <br />Page 4 <br />At locations DP-9 through DP-12, Amec Foster Wheeler will collect soil samples from two depth <br />intervals: 0 to 5 feet bgs (collected during hand augering) and from 5 to 10 feet bgs. The soil <br />borings will be advanced using a direct-push technology (DPT) drill rig equipped with a dual- <br />tube sampling system lined with acetate (or similar) sample sleeves. Continuous cores will be <br />collected with the OPT drill rig to the total depth of 10 feet bgs. <br />Soils (from borings DP-9 through DP-12) will be logged by a geologist for lithology in <br />accordance with the Unified Soil Classification System and staining and odors will be noted. <br />Discrete soil samples will be retained approximately every 2 — 3 feet by cutting a 6-inch section <br />of the sample liner and covering each end with Teflon® tape and plastic caps. The soil samples <br />will be placed in an ice chest with ice for temporary storage and delivery. A split of each soil <br />sample will be collected and placed in a resealable plastic bag and a photoionization detector <br />will then be used to measure ionizable gases in the headspace of the resealable bags; <br />photoionization detector readings will be recorded on the boring logs to assist in selection of <br />samples for analysis. Samples will be analyzed for TPHd, TPHg, benzene, toluene, <br />ethylbenzene, xylenes, methyl tert-butyl ether, and naphthalene. <br />The borings will be abandoned in place using a tremmie pipe to install a Portland cement slurry <br />from the total depth to the surface and completed to match the surrounding surface. <br />Investigation Derived Waste Management <br />Investigative derived waste (IDW) produced during the investigation will consist of <br />decontamination rinse water and soil cuttings from each boring. During the field activities, water <br />and soil IDW will be placed in Department of Transportation approved 55-gallon drums for <br />temporary storage pending analysis and proper disposal. IDW will be sampled for waste <br />characterization prior to disposal. A copy of the waste manifests will be provided to the Water <br />Board. <br />Schedule and Reporting <br />Amec Foster Wheeler will coordinate with the Water Board and Newark in advance of sampling. <br />A soil boring permit application will be submitted to the County upon approval of this Work Plan <br />from the Water Board. An estimated two weeks will be required to receive the final permits from <br />the County. Drilling activities will be scheduled to take place within three weeks of receipt of the <br />drilling permits. An estimated three days will be required to perform the investigation activities <br />and an additional two weeks will be required to receive the analytical results from the laboratory <br />following the end of field operations. Waste disposal will be scheduled pending results of the <br />IDW samples. A letter report will be prepared after receiving the analytical results from the <br />laboratory. The report will include the field notes, boring logs, analytical results, and summary <br />and recommendations. The report will be submitted within one month following receipt of the <br />laboratory data. <br />If you have any questions, please contact Gary Lieberman at (707) 793-3858. <br />Amec Foster Wheeler