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Lopez Property Page 2 <br /> 1601 Turnpike Road January 12, 2011 <br /> Stockton, California 5206 <br /> • Bromate was n t detected in the initial groundwater samples collected from MWA and <br /> MW-10, but was detected at 11 milligrams per liter (mg/L), slightly exceeding the <br /> California Envi onmental Protection Agency Maximum Contaminant Level (MCL) of 10 <br /> pg/L, in both soil/groundwater samples collected on the seventh day of ozonation. In <br /> comparison, b ornate was not generated in either of the groundwater samples <br /> collected from MW-1 and MW-10 after undergoing oxygen sparging. <br /> • After seven (lays, concentrations of total chromium, vanadium, molybdenum, <br /> selenium, antimony, and arsenic increased in both soil/groundwater samples with total <br /> chromium andarsenic detected above their respective MCLS. <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX) were reported at high concentrations in both <br /> initial groundwater samples but these chemicals of concern were not detected above <br /> the laboratory reporting limit in either soil/groundwater sample collected on the seventh <br /> day of the ozone injections. Also the two groundwater samples collected from MWA <br /> and MW-10 underwent oxygen sparging and concentrations of TPH-g and BTEX <br /> decreased ninety-seven percent. <br /> Based on the findings submitted in the OBST report, AGE has recommended the preparation <br /> and submittal of a Cor ective Action Plan (CAP) that will present a comparison of groundwater <br /> and soil remedial methods to determine the most cost effective remedial method to mitigate <br /> the petroleum hydrocarbon contaminants at this site. The EHD concurs with this <br /> recommendation and directs that CAP be submitted to this department by 01 April 2011. <br /> Please contact Vicki McCartney at (209) 468-9852 or by email at vmccartney(c�sicehd.com if <br /> you have any questio s. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered En ironmental Health S cialist Engineering Geologist <br /> c: Ms. Ally L. Colavita, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <br /> Mr. James L.L. arton, PG, California Regional Water Quality Control Board Central <br /> Valley Region; 11 20 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br /> Ms. Judy Kindle, 4946 Patric Way, Carmichael, California 95608 <br />