Laserfiche WebLink
1 - ff • <br /> � CAMBRIA <br /> downgradient of the suspected source area (MW-11-80 and MW-11-120), and upgradient of <br /> the suspected source area(MW-18-80 and MW-18-120) <br /> • The placement of these proposed wells in a line across the site does not allow for <br /> triangulation and calculation of deep groundwater gradient However, Cambria reviewed <br /> SJCPHS/EHD files and learned that the former ARCO facility located north or the subject <br /> site has deeply screened wells The ARCO wells are screened from 70 to 90 fbg and from <br /> 100 to 120 fbg We plan to screen our wells from approximately 70 to 80 fbg and from 110 <br /> to 120 fbg We propose coordinating sampling events with the ARCO site and sharing <br /> groundwater elevation data from the sampling events With groundwater elevation data from <br /> each site we will be able to calculate the deep groundwater gradients beneath the sites <br /> WORK PLAN <br /> We propose installation of six deep groundwater monitoring wells at the subject site The wells <br /> will allow repeated monitoring events in deep groundwater zones to determine concentration of <br /> petroleum hydrocarbons and to determine concentration trends over time <br /> Work Tasks <br /> Well Permit Cambria will obtain a well permit for each parcel (two) where wells are proposed <br /> We will apply for the well permit after SJCPHS/EHD has reviewed and approved of our work <br /> plan <br /> Site Safety Plan A Site Safety Plan will be prepared for field work <br /> Utility Clearance The proposed drilling location will be marked and cleared through <br /> Underground Service Alert prior to drilling <br /> Site Investigation• Six deep groundwater monitoring wells are proposed at the locations shown <br /> on Figure 2 The wells will be drilled using hollow-stem auger drilling equipment If, after <br /> consulting with the driller it is determined appropriate to install a conductor casing as part of <br /> installing these wells, a mud-rotary drilling rig may be used for drilling the upper portion of the <br /> well and for conductor casing installation <br /> A Cambria geologist will supervise the drilling and describe encountered soils in the well boring <br /> using the Unified Soil Classification System and Munsell Soil Color Charts Soil samples will <br /> 1399 2 <br />