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Guardino and Crawford Construction Page 2 Of 2 <br /> 517 West Fremont Street October 14, 2013 <br /> Stockton, California 95201 <br /> A sensitive receptor survey that includes, but is not limited to, all water supply wells <br /> within 2,000 feet of the source area; <br /> Estimates of dissolved and adsorbed contaminant mass at this site supported by <br /> calculations; and <br /> An assessment of the potential for vapor intrusion inside buildings located at the site. <br /> Therefore, the EHD directs that a CSM that includes this information be submitted to this <br /> agency by 31 December 2013. <br /> In the second-quarter 2013 report, AGE has recommended that during the next sampling event <br /> scheduled for November 2013 , monitoring wells MWA through MW-8, extraction well EW-1 , <br /> and observation wells OB-1 and 013-2 be sampled for groundwater analysis. Instead , based on <br /> the analytical data submitted from the May 2013 sampling event and historical groundwater <br /> analytical data , the EHD directs that MW-3 through MW-8 be removed from the sampling <br /> schedule. Only collect groundwater samples semi-annually from MWA , MW-2, OBA , OB-2 and <br /> EWA and analyze the groundwater for total petroleum hydrocarbons as gasoline (TPH-g) ; <br /> benzene, toluene, ethylbenzene and total xylenes (BTEX) ; methyl tertiary-butyl ether (MTBE) ; <br /> tertiary-amyl methyl ether (TAME) ; and 1 ,2-dichloroethane (1 ,2-DCA) . Also, please submit the <br /> second-quarter 2013 report to GeoTracker immediately. <br /> Please contact Vicki McCartney at (209) 468-9852 or by email at vmccartney@sjcehd . com if <br /> you have any questions . <br /> Sincerely, !EHSNuel <br /> Victoria L. McCartney, % C. Henderson, Jr. , PG <br /> Senior Registered Environmental Healf{h Specialist Engineering Geologist <br /> c: Mr. Brian Millman , PG , Advanced GeoEnvironmental, Inc. , 837 Shaw Road , Stockton , <br /> California 95215 <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 95670 <br />