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Addendum to Groundwater Investigation Work Plan <br />SJC Records Retention Center <br />February 22, 2019 <br />Page 2 <br />Samples selected for laboratory analyses will be cut above and below the selected sample interval to <br />separate the sample from the rest of the four -foot tube, capped with Teflon® tape and plastic end caps, and <br />placed into a pre -cooled ice chest pending shipment to an analytical laboratory under chain -of -custody <br />procedures. Condor will collect a discrete groundwater sample from the off-site soil boring with a <br />hydropunch type groundwater sampler or through a temporary casing installed through the drilling rods. <br />The collected groundwater sample will be placed into appropriate containers supplied by the laboratory and <br />into a pre -cooled ice chest pending transport to the laboratory under chain -of -custody procedures. Upon <br />completion of sampling activities, the borings will be filled with neat cement grout from the bottom of the <br />bore hole to the ground surface using a tremie pipe where necessary. <br />Collected samples will be analyzed for total petroleum hydrocarbons as diesel (TPH-d) using EPA Method <br />8015M, and total petroleum hydrocarbons as gasoline (TPH-g), benzene, toluene, ethylbenzene, xylenes <br />(BTEX), 1,2-dichloroethane, naphthalene, and methyl-tert-butyl ether (MTBE) using EPA Method 8260B. <br />If necessary, the soil samples will also be analyzed for total lead by EPA Method 7420 or equivalent for <br />disposal characterization. <br />Condor will obtain the appropriate permits from San Joaquin County Environmental Health Department <br />(EHD) prior to conducting the work. A report describing the installation activities will be prepared and <br />submitted as described in the Work Plan. <br />If you have any questions, please contact me at; ilane@condorearth.com or (209) 938-1061. <br />Respectfully submitted, <br />AL <br />CONDOR EARTH TECHNOLOGIES, INC. <br />No. 8795 <br />JoAd. �F C <br />John P. Lane, PG February 22, 2019 <br />Environmental Services Manager <br />Attachments: <br />Figure 1 — Vicinity Map <br />Figure 2 — Site Map with Proposed Soil Boring Locations <br />Figure 3 — Site Aerial Photo with Proposed Off -Site Soil Boring <br />cc: San Joaquin County General Services <br />X:\Projec1\5000_pd\5960 SJC UST RFQ\5960B County of San Joaquin - Records Center\5960135 Records Retention Center\Reports\Work Plan Addendum\L <br />20190222 Addendum to WP 5960B5.docx <br />#* lkk;� <br />to CONDOR <br />