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e %Nod% <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> P SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Heran <br /> K <br /> Donna K. ,R.E.H.S. Carl Borgman,R.E.H.S. <br /> -� 304 East Weber Avenue, Third Floor <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. StoCktOIl, California 952022708 <br /> - Douglas W.Wilson,R.E.H.S. <br /> • �4, a�P• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> <<F o R Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S, <br /> TRUST OF MARY GARDELLA ESTATE OF JOE GARDELLA <br /> WINIFRED ALEXANDER DENNIS CASPE ESQ <br /> 525 2' ST 2035 N PACIFIC AVE <br /> SANTA CRUZ CA 95060 SANTA CRUZ CA 95060 <br /> RE: STEFANOS GASOLINE <br /> 1419 E CHARTER WAY <br /> STOCKTON,CA 95205 <br /> WORKPLAN: Workplan for Soil Vapor Extraction Testing DATED:August 12,2003 <br /> PREPARED BY: Might Environmental Services Inc. <br /> APPROVED with Conditions (See Below) <br /> AD UATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S 25299.37,subd.(c)(3).): <br /> 1. Install extraction well EW-1 to 30 feet below surface grade(bsg)within silt zone. <br /> 2. Install extraction well EW-2 to 35 feet bsg. <br /> 3. Install three vapor monitoring probes to different depths of 10 to 20 feet bsg,25 to 30 feet bsg, <br /> and 30 to 35 feet bsg as observation points to evaluate the effectiveness of the soil vapor <br /> extraction(SVE)pilot test. <br /> 4. Conduct a 4-hour SVE pilot test(2 hours per extraction well). Vapor samples will be collected <br /> using Tedlar bags for analyses. <br /> COMMENTS AND CONDITIONS: <br /> 1. The work plan did not include construction diagrams,description,or method of installation of <br /> the proposed vapor monitoring probes. In a fax dated September 8,2003,Wright stated that <br /> "well"and'probe"construction detailr will be provided with the "report of fandrng�"from thrr pilot test. This is <br /> unacceptable because one of the main goals of the SVE.pilot test is to obtain information such <br /> as vacuum pressure and air flow rate from the observation wells(or in this case,monitoring <br /> probes)in order to calculate the radius of influence (ROI) and evaluate SVE as a clean up <br /> technology for this site. Therefore,the proposed vapor monitoring probes must be installed <br /> before conducting SVE pilot test,and EHD cannot approve their installation without the above- <br /> mentioned construction details. Submit by mail or fax the information including construction <br /> diagram,details,and method of installation to EI D by September 18,2003. <br /> 2. Install the three vapor monitoring probes in a cluster group (not nested)and preferably in the <br /> downgradient direction. <br /> 3. One magnahelix must be installed at each monitoring probe and extraction well_ In addition,a <br /> flow meter must be installed at each extraction well. Complete seal of all the probes and wells <br /> associated with the SVE test must be achieved in order for the SVE pilot test to yield any <br /> significant data. <br /> 4. Begin implementation(well installation)by October 18,2003. <br /> DATED Se tember 10 2003 BY <br /> v V <br /> C: RvVQCB,Central Valley Region—James L.L.Barton,RG <br /> C: Wright Environmental Services,Inc.—Jeff Downs,RG <br />