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<br /> Parkinson's I-5 ARCO Service Station Page 2
<br /> 3250 West Hammer Lane June 30,2008
<br /> Stockton, California 95209
<br /> Regulatory Council (ITRC)In Situ Chemical Oxidation guidance document should be used when
<br /> preparing the work plan and a justification for variations from that guidance document must be
<br /> provided. The work plan objectives should include:
<br /> • Acquiring sufficient data to evaluate the potential cost effectiveness of insitu oxidation
<br /> (total cost estimate compared to other remedial methods) in addition to the technical
<br /> effectiveness of ozone remediation;
<br /> • Identifying adverse effects to water quality by ozone injection, and
<br /> • Projecting the extent of the adverse effects, if applicable, and the time required to restore
<br /> the aquifer to background levels.
<br /> If results from the laboratory bench-scale test are favorable, a work plan for a field pilot study
<br /> will be necessary prior to installing an ozone system at your site.
<br /> The EHD has reviewed the total depths reported for the six monitoring wells on January 28, 2008,
<br /> and has concluded that MW-6, screened between 57.5 and 62.5 feet below surface grade (bsg),
<br /> must be redeveloped. The total depth reported for MW-6 was 60.07 feet bsg, indicating that
<br /> approximately two-and-a-half feet of the five-foot screen may have been "silted in". Also,MW-2
<br /> must be redeveloped since several feet of the fifteen-foot screen appear to be "silted in". Please
<br /> develop these wells prior to the next sampling event.
<br /> EHD does not have a current sensitive receptor survey report that includes surface water,hospital,
<br /> and school locations, as well as domestic, municipal, industrial and other wells within a 2,000-
<br /> foot radius of this site. Contact the Department of Water Resources, municipal water suppliers,
<br /> the EHD, and nearby industries for well information. If appropriate, perform a physical search of
<br /> the area to identify all wells. Show the location of all water supply wells, schools, etc. on a map,
<br /> relative to the location of the subject site. Submit any known construction details of the wells,
<br /> and identify all sources of information in the report. Submit this report to EHD by September 25,
<br /> 2008.
<br /> If you have any questions, please contact Vicki McCartney, Senior Registered Environmental
<br /> Health Specialist,by telephone at(209)468-9852 or by email at vniccartney@,sicelid.com.
<br /> Sincerely,
<br />�I
<br /> Victoria L. McCartney,REHS Nuel C.Henderson,Jr., PG
<br /> Senior Registered Environmental Health Specialist Engineering Geologist
<br /> c: Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley
<br /> Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670
<br /> Ms. Sarah O. Salcedo,PG, Stratus Environmental, Inc., 3330 Cameron Park Drive,Suite 550,
<br /> Cameron Park, California 95682
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