Laserfiche WebLink
page 2 <br /> Beacon #3641 May 4, 2010 <br /> 1210 E. Hammer Lane, Stockton <br /> The guidance documents the EHD follows, Interstate Technical Regulatory Council (ITRC-2007) <br /> ::and the Los Angeles Regional Water Quality Control Board /Department of Toxic Substances <br /> Control-2003, calls for.either 3 or 4 purge volumes or a step test,.up to seven purge volumes, in <br /> order to identify the proper volume to ensure a valid sample. Horizon proposes only a one <br /> apparatus volume purge. <br /> Horizon did not provide technical justification to support their proposed one-volume purge and <br /> the EHD does not approve the single apparatus volume purge. Although the EHD recommends <br /> complete adherence to the guidance documents, in order to minimize error without the benefit of <br /> purge-volume testing, the EHD requires a three-.purge volume prior to sampling. The EHD will <br /> reconsider this purge volume requirement if the proposed action is supported by authoritative <br /> guidelines applicable to California UST sites and appears to be appropriate for your site. <br /> The EHD has reviewed the historical soil data from the closest borings (MW-11VW-112 and VW- <br /> 314) to the building. The soil samples from these wells were'collected in 1996 and without <br /> current soil contaminant data to support an estimate of the residual soil mass, the soil gas data <br /> from only one soil vapor probe will not be adequate. The EHD requires one additional soil vapor <br /> probe to be installed approximately 30 feet south of SG-3, as noted on Figure 2 of the Plan. <br /> You are stili to collect the 0.25-liter Summa canister duplicate sample for analysis by TO-15. <br /> The Plan is approved with the above noted conditions included. Please submit a Well Permit <br /> r <br /> Application Form and $89 fee immediately. <br /> You may contact Mich Inf ma at (209) 468-3454 if you have any questions. <br /> Michael J. Infurna Jr., REHS Nuel C. Henderson Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. James L. Barton, CVRWQCB, Underground Storage Tank Unit, 11020 Sun Center <br /> r Drive, #200, Rancho Cordova, CA 95670-6114 <br /> Mr. Mark Owens, SWRCB, Division of Clean Water Programs, Underground Storage <br /> Tank Program, PO Box 944212, Sacramento, CA 94244-2120 <br /> Mr. Gary Barker, 'Horizon Environmental, 4970 Windplay Drive, #C5, El Dorado Hills, CA <br /> 95762 <br /> a <br /> u.3 <br /> I <br /> I , <br />