WORK PLANS - Laserfiche WebLink

Home Browse Search

Dorazio, Barnhorst Bonar IVooci ard•Clycle Consultants i Project No. 8753009Q-AN02 Page 2 SCOPE OF SERVICES Based on the- information obtained during the Phase I investigation, a scope of services detailing work activities associated with a Phase II Subsurface Investigation has been developed. The Phase II Subsurface Investigation will include the following tasks: Task 1. Revised WCC Health and Safety Plan Occupational Safety and Health Administration (OSHA) regulations (29 CFR Part 1910) require health and safety plans for hazardous waste site characterization. Because additional work activities are proposed, new subcontractors are involved (discussed in Task 3) , and new information was obtained during the Phase I investigation, the existing WCC Health and Safety Plan will be revised to address the potential for exposing WCC personnel to hazardous materials. Task 2. Information Review We will evaluate the possible influence of San Joaquin River stage, storm drains, off-site industrial supply wells on groundwater flow beneath the site; and review additional information concerning subsurface conditions within the terminal area in boring logs and groundwater data from lessee wells. Task 3. Field Investigation We propose to accomplish the following activities during the field inves- tigation: • Exploratory trenching will be conducted in the area between the petroleum terminal and the cogeneration facility construction site. Shallow trenches with dimensions of about 15 feet by 3 feet by 6 to 8 feet deep will be excavated to the water table. The trenches will initially be located approximately along the 7.0-foot groundwater contour shown on Figure 1. If hydrocarbons are encountered, additional trenches will be excavated further east and south of the excavated trenches in order to determine the lateral extent of hydrocarbons, to observe the relative groundwater elevation and to characterize shallow stratigraphy near the site. We anticipate that the exploratory trenching would require three to five days to complete, depending on the Q lateral extent of subsurface hydrocarbons. Soil samples obtained q� from the exploratory trenches will be evaluated in the field for the presence of hydrocarbons using visual cues and an organic vapor meter (OVM). Up to 30 soil samples will be submitted for laboratory ilysis of total extractable hydrocarbons (TEH) ; c Storm dpaiji outfalls from the site will be identified and, if the storm drain inverts are below the water table, up to three water samples will be obtained for laboratory analyses of TEH, benzene, "olucne, xylenes, ethylbenzene, and total phenols;