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1419 Charter, Stockton <br /> Stefano Gasoline <br /> Page 2 <br /> Groundwater was measured at approximately 60 feet bsg Historic low for groundwater <br /> (1979) in 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 installingthree morutonn wells in the Ci of <br /> g rY <br /> Stockton (COS) right-of-way COS has denied 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 approximately 125 feet bsg in, the center of Charter <br /> Way(COS nght-of-way) Additionally,the March 2001 report proposed rmstalling two <br /> monitoring 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 continence <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 /> Jeffrey Wong, RE HS Dot Lofstrom,RG <br />' LOP/Site Mitigation Urut IV LOP/Site Mitigation, Unit IV <br /> C. RWQCB, Central Valley Region- Marty Hartzell <br /> O Wnght Environmental Services,Inc <br /> ✓G Ramage Environmental-Joe Ramage <br />