Laserfiche WebLink
1419 Charter Way <br /> a <br /> Stefano Gas Station <br /> Work Plan Approval,Page 2 <br /> the screen is above the groundwater table may reduce the effectiveness of the ozone <br /> remediation system. Submit a work plan for an ozone injection interim remediation <br /> system to EHD by August 18,2003. <br /> 3. The work plan proposed utilizing a SVE system to:address the contamination on site in <br /> the vadose zone between 15 feet to 30 feet bsg. The highest level of contaminants in <br /> the soil was identified at about 12 feet bsg from the tank pull samples. Similar <br /> concentrations of contamination were identified at 30 feet bsg based on MW-2 soil <br /> boring samples. CPT-1 boring log indicated a zone of clayey silt to silt with thin lenses <br /> of sandy silt from about-13-feet_bsg to 29 feet bsg;and a sand layer between 29 feet and . <br /> 35 feet bsg. `EHD recommends installing two separate SVE wells with screen sections <br /> targeting these zones to maximize the effectiveness of SVE technology. Submit a work <br /> plan for a SVE feasibility test to EHD by August 18,2003. <br /> 4. The monitoring wells and/or multi-chambered wells will be installed after obtaining the <br /> new CPT results. EHD requests all the monitoring wells,c-sparge wells;and SVE wells <br /> be installed in the same mobilization. The work plan referenced lead time is required to <br /> obtain necessary permits from the San Joaquin County Air Pollution Control District . <br /> (SJAPCD). EHD requests you begin the permit application process as soon as possible. <br /> Failure to obtain required permits is not a reason to delay implementation of the <br /> proposed work. <br /> 5. Implement the CPT phrase of work by August 18,2003. <br /> 6. The work plan proposes to evaluate the need for additional geophysical survey and hand <br /> probing to locate"possible"buried sources such as drums based on the 1999 (not 2003 <br /> as stated in the work plan) magnetic survey conducted by Ramage. This work is r. <br /> approved but not directed by EHD <br /> REASONS FOR DISAPPROVAL OF A PART OF THE WORKPLAN (H8--S 25299.37, <br /> subd.(c)(3).): <br /> 1. EHD does not agree with the use of oxygen releasitag compound(ORC) as remediation <br /> alternative at this time. If you wish'to pursue the use of ORC,please submit to E14D a <br /> Est of all the Local Oversight Program sites within Region 5 that have received closure <br /> as a direct result of using ORC. <br /> DATED July 17,2003 BY—*t' <br /> C: RWQCB, Central Valley Region–James L.L: Barton,?RG <br /> C: Wright Environmental Services,Inc. —Christopher Palmer,RG <br /> f"J <br /> s, . <br />