Laserfiche WebLink
San Joaquin County <br /> Environmental Health Department D,RE <br /> 2. 2 600 East Main Street DonnnaaHeran,RENS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> kL Robert McClellon,REHS <br /> '. <br /> Jeff Carruesco, RENS, RDI <br /> Website: www.sfgov.org/ehd Kasey Foley,REHS <br /> Phone: (209)468-3420 Linda Turkatte, REHS <br /> Fax: (209)464-0138 <br /> October 15, 2010 <br /> Mr. Sergio Morescalchi Ms. Shelby Lathop <br /> Atlantic Richfield Company ConocoPhillips Company <br /> Post Office Box 1257 76 Broadway <br /> San Ramon, California 94583 Sacramento, California 95818 <br /> Subject: 76 Service Station No. 11193 <br /> 3202 West Hammer Lane <br /> Stockton, California <br /> The San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Semiannual Groundwater Monitoring and Quarterly Remediation Progress <br /> Report Second Quarter 2010, dated 28 July 2010, prepared and submitted by your <br /> consultant, Stantec Consulting Corporation (Stantec), on your behalf for the above- <br /> referenced subject site. Concentrations of chemicals of concern, including gasoline-range <br /> organics (GRO); benzene, toluene, ethylbenzene, and total xylenes (BTEX); methyl <br /> tertiary-butyl ether (MTBE), and tertiary-butyl alcohol (TBA), have decreased significantly <br /> in groundwater samples collected from the two most-impacted wells, monitoring well <br /> MW-2R and vapor extraction well VW-1, since 25 May 2004, when the ozone sparge <br /> system was first operational as an interim remediation method. Groundwater samples <br /> collected from the remaining on- and off-site monitoring wells show a similar decrease in <br /> concentrations of the two most-abundant contaminants, MTBE and TBA. Based on these <br /> results, the EHD recommends suspending the ozone injection system for rebound testing. <br /> If you have any questions concerning this letter, please contact Vicki McCartney at (209) <br /> 468-9852, or by email at vmccartney@sjcehd.com. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health pecialist Engineering Geologist <br /> c: Mr. Brad Shelton, PG, Stantec Consulting Corporation, 3017 Kilgore Road, Suite <br /> 100, Rancho Cordova, California 95670 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California <br /> 95670 <br />