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Tracy Office Plaza Page 2 of 2 <br /> 324 East Eleventh St., January 15, 2015 <br /> Tracy, CA 95376 <br /> Summary of Released Waste: <br /> Based on analytical data provided by Pangea Environmental Services, Inc., groundwater samples <br /> collected on July 8, 2013, between 9 to 15 feet below surface grade, yielded results as high as 33,000 <br /> micrograms per liter (pg/L) of total petroleum hydrocarbons as motor oil (TPH-mo), 72,000 pg/L of <br /> total petroleum hydrocarbons as diesel (TPH-d), and 7,300 pg/L of total petroleum hydrocarbons as <br /> gasoline (TPH-g). In soil samples collected on July 8, 2013, TPH-g concentration in soil at 1 foot bsg <br /> was reported as high as 2,400 pg/L and TPH-g was also detected in a soil sample collected at 10 feet <br /> bsg at a concentration of 380 pg/L. Neither TPH-mo nor TPH-d were analyzed for in soil samples <br /> collected this day. <br /> Based on analytical data provided by Pangea Environmental Services, Inc., groundwater samples <br /> collected on July 10, 2014 yielded results as high as 410 pg/L TPH-g (collected between 15 to 20 feet <br /> bsg), 280 pg/L TPH-d (collected between 21 to 24 feet bsg), and TPH-mo was reported as "ND" (with <br /> reporting limit as high as 750 pg/L). In soil samples collected at 1 foot bsg on July 10, 2014, <br /> concentrations were reported to be 160 pg/L of TPH-mo; 2,600 pg/L of TPH-g; and 800 pg/L of <br /> TPH-d. <br /> Unless notified that jurisdiction by the California Department of Toxic Substances or the Central Valley <br /> Regional Water Quality Control Board is or will be assumed for the investigation and remediation of <br /> the released waste at this site, the EHD will proceed with entering into the Voluntary Remedial Action <br /> Agreement once the ten (10) working day notification period has expired. <br /> Please contact Adrienne Ellsaesser at (209) 468-0343 for more information. <br /> Adrienne Ellsaesser, REHS <br /> Program Coordinator <br /> Ec: Leona.Winner@dtsc.ca.gov <br />