ARCHIVED REPORTS_XR0007633 - Laserfiche WebLink

Home Browse Search

' • • •CAMBRIA Groundwater Sampling in the CPT Boring Groundwater samples will be collected from the CPT boring at approximately 10-foot intervals using CPT groundwater sampling equipment commencing at approximately 30 fbg Groundwater sampling depths will be determined in the field based on the soil types encountered in the CPT boring Coarse-grained zones will be targeted for groundwater sampling If coarse-grained soils are not encountered in the CPT boring we will attempt to collect groundwater samples at 10-foot intervals starting at 30 fbg The groundwater samples will be placed in approved groundwater sample containers and submitted to a State of California certified laboratory for analyses Monitoring Well Construction Each well boring will be drilled to approximately ten feet below first encountered groundwater The wells will be competed using four-inch diameter Schedule 40 PVC casing The well screen interval will be approximately five feet above and ten feet below first encountered groundwater The sandpack will be placed from the bottom of the well screen up to two feet above the top of the well screen followed by a two-foot thick bentonite seal and cement grout to grade Actual well construction details will be based on field conditions during drilling The well will be secured with a locking cap under a traffic- rated well box A licensed surveyor will survey the wellhead elevations relative to mean sea . level and the location of each well The well designations scheme has been altered for the proposed wells Since wells at the Chevron site use the "MW" prefix, we have decided to name our new wells with an "S" prefix so that it is clear which wells belong to which site The scope of work described in this work plan will be performed under the supervision of a registered geologist Well Development and Sampling Blaine Tech Services, Inc (Blaine) of San Jose, California will develop the new wells, gauge groundwater depths, collect groundwater samples, and submit the samples to a State of California certified laboratory for analyses for all site wells Chemical Analyses Groundwater samples and selected soil samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHg), BTEX by EPA Method 8020 Groundwater samples and selected soil samples will also be analyzed for MTBE, ethanol, tertiary amyl methyl ether, ethyl tertiary butyl ether, tertiary butyl alcohol, di-isopropyl ether, 1,2-dichloroethane, and ethylene dibromide by EPA Method 8260 0813 5