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HORIZON ENVIRONMENTAL INC. <br /> ,ter Specialists In Site Assessment,Remedial Testing,Design and Operation <br /> September 25, 1995 <br /> Mr Kenneth Earnest <br /> Ultramar, Inc <br /> 525 W Thud Street <br /> Hanford, CA 93230 <br /> Subject Third Quarter 1995 Remediation Status Report <br /> Former Beacon Station No 494 <br /> 2185 East Fremont Street, Stockton, Califorrua <br /> Mr Earnest <br /> Horizon Environmental Inc (Horizon) has prepared this Quarterly Remediation Status Report <br /> which presents the results of the 1995 third quarter remediation system morutonng and sampling <br /> for the above-referenced site(Figure 1) During this period a groundwater treatment system <br /> (GWTS) operated at the site The GWTS is operating under a City of Stockton Wastewater <br /> Discharge Permit dated Au st 21 1993 Previousl a va or extraction system (VES)had been <br /> • operatrn at the sit On June 6,in the last quarter reporting eriod the VES was shut down and <br /> U sequently removed from a stte extraction and emission data are summarized in Table <br /> Durmg flus reporting period Horizon personal visited the site to perform operation, maintenance <br /> and sampling of the GWTS Horizon personal compoundonsite <br /> and monitoly 5, �ringgwells arst s 25 and <br /> e shown <br /> September 7, 1995 Locations of the remechatio <br /> along with other pertinent site features on the attatched site plan(Figure 2) <br /> 0 <br /> GWTS <br /> During thus reporting period the GWTS operated continuously� ouunntiilyS t sample wase collected <br /> discharged approximately 46,996 gallons of groundwatergr <br /> twice per month, with the exception of September and analyzed for Total Petroleum <br /> Hydrocarbons as gasoline (TPHg) and Benzene, Toluene, Ethylbenzene, and Total Xylenes <br /> (BTEX) On September 7, the system was temporarily shut down for an evaluation of th <br /> groundwater condition under a non-pumping situation Average flow rates ranged form 0 39 <br /> gallons per minute(gpm)to 0 51 gpm. Laboratory results uidicated that discharged groundwater <br /> during this period had concentrations of 1=ranging from 77 artser bilhon pb)to below <br /> ncetratns <br /> om 13 ppb to below th <br /> the laboratory detection hmit and benzene ran M CO to snshown o Table 2with this reportlaboratory detection limit A summary of the GWTS data <br /> 5011 Golden OBoixi 5283 Bakersfield,CA 9388N*iIsI(80?95762 <br /> 5 4 898395 FAX(8050589-45615 939-2172 <br />