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2575 Country Club <br /> August 1997 <br /> Page 2 <br /> Groundwater beneath the site has been measured as shallow as 5.6 feet bgs since December <br /> 1994. Soil boring RW-B 1 drilled to 46.5 feet bgs represents the maximum depth of the <br /> investigation completed to date. While the TPH-gas concentrations attenuated to less than 1.0 <br /> ppm at 46.5 feet bgs, concentrations of benzene (0.014 ppm) toluene (0.023 ppm) xylene (0.025 <br /> ppm) and methyl tertiary butyl ether(0.62 ppm) were detected. Additionally, there is an <br /> impacted domestic well located approximately 250 feet southeast of the site,2468 Country Club, <br /> which evidenced methyl tertiary butyl ether concentrations of up to 8.1 ppb and which is <br /> constructed to a depth of 135 feet bgs. The addendum indicated that because a clay layer was <br /> observed between 25 and 46.5 feet bgs, the installation of a deeper monitoring well was not <br /> appropriate. PHS/EHD disagrees with the supposition that the clay layer has prevented the <br /> migration of contaminants to a deeper water bearing zone based on the detection of contaminants <br /> at the maximum depth of investigation and the detection of contaminants in a neighboring <br /> domestic well. <br /> A work plan to install a deeper monitoring well(s) to investisate the vertical extent of <br /> contamination shall be submitted by September 9, 1997. A drilling permit application and <br /> S89 fee shall be included with the work plan unless Gregg Drilling and Testing is the C-57 <br /> licensed driller implementing the work plan. This work plan must also include the installation <br /> of any wells necessary to perform the feasibility analysis of various remedial options. Shell <br /> should plan on implementing this work plan as soon as the work plan has been approved and any <br /> necessary drilling permit issued. <br /> PHS/EHD requested in the correspondence dated April 7, 1997 that once the Caltrans <br /> encroachment permit was issued, that a PHS/EHD drilling permit application and S89 fee be <br /> submitted to install the offsite well located southwest of MW8. PHS/EHD has received from <br /> Caltrans a copy of the Caltrans encroachment permit 410976SV-0361 dated August 1, 1997, but <br /> has not received from Shell a PHS/EHD drilling permit application and fee for the off site <br /> drilling. A PHS/EHD drilling permit application and S89 fee for the off site drilling should be <br /> submitted immediately. <br /> Also, please note that the Caltrans well located at Plymouth and Country Club should also be <br /> sampled for the presence of contaminants related to Shell's operation of underground storage <br /> tanks. PHS/EHD understands from Bob Songey with Caltrans, that Caltrans is willing to allow <br /> the well to be sampled, but beyond an initial telephone communication with an Enviros <br /> representative, has not been contacted further. Please immediately proceed with efforts to <br /> coordinate with Caltrans representatives to sample their well. <br /> As you know, PHS/EHD has been contacted by two additional property owners regarding Shell's <br /> sampling of nearby domestic wells and efforts are underway to gain access to the properties <br /> located at 2472 Country Club and 2450 Country Club to sample domestic wells. It has come to <br /> PHS/EHD's attention that there may not be well located on the property of 2450 County Club, <br /> but this must be verified. <br />