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1419 Charter, Stockton <br /> ' Stefano GasoLne <br /> Page 2 <br /> Groundwater was measured at approxumately 60 feet bsg Historic low for groundwater <br /> (1979) i i the area is between approximately 80 feet bsg and 90 feet bsg According to CPT <br /> data, gravelly sand and sand layers are present between 57 feet bsg and 61 feet bsg, with silt <br /> to clayey silt layers below <br /> The vertical extent of the groundwater plume has not been defined at 60 feet bsg <br /> ' The December 1999 work plan proposed installing three monitoring weUs in the <br /> Cary of <br /> Stockton (COS) right-of-way COS has derued the encroachment permit The March 2001 <br /> ' report proposed to modify the work plan by advancing two co-located CPT bonngs (one for <br /> sounding, one for sample collection) to approxunately 125 feet bsg in the center of Charter <br /> Way(COS nght-of-way) Additionally, the March 2001 report proposed installing two <br /> ' monitonng wells on the fairground property Discrete groundwater samples will be <br /> collected at 60 feet bsg and 105 feet bsg <br /> ' PHS/EHD approves this work plan modification on the condition that the work commence <br /> no later than July 4, 2001 <br /> If you have any questions, please feel free to contact Jeffrey Wong at (209) 468-0335 <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> ' 1 V <br /> Jeffrey Wong, RE HS Dot Lofstrom, RG <br />' LOP/Site Mitigation Unit IV LOP/Site Mitigation, Unit IV <br />' C. RWQCB, Central Valley Region— Marry Hartzell <br /> C:. Wright Environmental Services,Inc <br /> ✓C Ramage Environmental-Joe Ramage <br />