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REMEDIAT10N TESTING AND DESIGN <br /> 849 Almar Avenue <br /> Suite C -215 <br /> Santa Cruz, Caliiornia 95060 <br /> Phone ( 40b ) 458--1612 <br /> Fax ( 408 ) 426-5796 <br /> March 23, 1993 <br /> Mr Michael J Infurna, Jr , R E H S <br /> Senior Registered Environmental Health Specialist <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> 445 N San Joaquin Street <br /> Stockton, California 95201 <br /> P <br /> Subject <br /> Workplan Modification/Proposal to Utilize Vapor Probes <br /> as Vacuum Extraction Points at the Former Beacon <br /> Station 0 494 Located at 2185 East Fremont Street in <br /> Stockton, California <br /> Dear Mr Infurna <br /> Remediation, Testing and Design (RTD) is pleased to submit the <br /> following workplan modification/proposal to utilize vapor probes <br /> as vacuum extraction points These probes were originally <br /> installed for a soil gas survey (SGS) and vacuum extraction <br /> feasibility test ( VEFT) on March 17, 1993 This workplan <br /> modification/proposal is in response to our conversation at the <br /> subject site on March 18, 1993 and our telephone conversation on <br /> March 23, 1953 in which you requested a modification to the <br /> workplan detailing how the probes would be sealed to prevent <br /> surface runoff from entering the probes W <br /> The probes are constructed of schedule-80 3/4-inch diameter <br /> carbon steel pipe Each probe contains a 36 inch range of <br /> drilled perforations at one end with a forged point The probes <br /> were hammered into the ground to total depths ranging from 12 to <br /> 17 feet below grade The original proposal called for removal of <br /> the probes and backfilling the holes with a neat portland cement <br /> slurry At the request of Ultramar, Inc , we are proposing to <br /> leave the probes in place for- use as vacuum extraction points to <br /> aid in site remediation activities , <br /> The probe-heads will be completed with a water tight well cover, <br /> concrete and bentonite pellet seals ' Figure 1 is a diagram <br /> showing our plan for completing the probe heads This approach, <br /> ,as outlined _in Figure 1, is based on your input as to what would <br /> be acceptable to Public Health Services <br />