ARCHIVED REPORTS XR0000575 - Laserfiche WebLink

Home Browse Search

' J Chevron Products Company 3 Chevron Service Station#9-0557,139 South Center Street,Stockton,California 6101/01 • Soil Selection and Analysis. Soil samples for shallow wells will be collected continuously. Selected soil samples will be sent under chain-of-custody procedures to a California State-certified laboratory and analyzed for the presence of total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethyl-benzene, and xylenes (BTEX compounds), and methyl tertiary butyl ether (MtBE). • Groundwater Well Development and Surveying. Upon completion of well installation, the wells will be developed by appropriate methods. A licensed surveyor will also survey the well elevations relative to a known benchmark. • Groundwater Sampling and Analysis. Groundwater samples will be collected from the monitoring wells and submitted to a California State-certified laboratory and analyzed. Collected samples will be analyzed for the presence of TPHg, BTEX compounds, and fuel oxygenates and lead scavengers including MtBE, tertiary butyl alcohol (TBA), di-isopropyl ether(DIPE), ethyl tertiary butyl ether (EtBE), tertiary amyl methyl ether (TAME), 1,2-dichloroethane, ethylene dibromide (EDB), ethanol and methanol. Field and Iaboratory procedures, providing a detailed description of the methods that will be employed to complete the above described scope of work, are presented as Attachment C. Dual Phase Extraction (DPE) Feasibility Testing SECOR will conduct a four-day DPE feasibility test using the four newly installed wells (MW-9A, MW-10, MW-11, and MW-12 [one 8-hour test per well]). DPE utilizes a 2-inch diameter groundwater extraction PVC pipe placed within each extraction well. A vacuum will be applied to the inner pipe such that groundwater is extracted, thereby depressing the water table and exposing a greater portion of well screen for soil vapor extraction. Extracted groundwater and soil vapor will be separated aboveground. The separated soil vapor will be routed to a catalytic/thermal oxidizer for hydrocarbon abatement. The separated groundwater will be routed to a holding tank for profiling and disposal after the test. A more complete description of DPE pilot test procedures is presented in Attachment D. Aquifer Test The aquifer test will consist of a step-drawdown and constant-rate pumping tests. Step tests will be used to evaluate maximum pumping rates,while constant rate tests will be used to evaluate aquifer parameters including transmissivity(T), storativity(S), specific yield (Sy), and conductivity(K). Extracted groundwater will be stored in a holding tank for profiling and disposal after the test or treated . and discharged to the sanitary sewer under permit from the local publicly owned [:1Chevron1905571REPORTS1Feasibility Studylworkplan.doc