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ENVIRONMENTAi[:H A.LTArDEPAR.TMENT <br /> °A SAN JOAQ IN COUNTY <br /> ).•._;,�'%';;G Unit Supervisors <br /> Donna K. Ilcran,R.I?.I1.5. <br /> :'� 3(}4 East Weber vent.le, Thu-d Floor Carl 13orgman,It.E�.FLS. <br /> �. Director' Mike Huggins,R.E.1-I- it.D.l, <br /> AloE��n,Iz.r.l�.s. Stockton, Calif'( rnia 95202-2708 <br /> ". Douglas W.Wilson, R.E.H.S. <br /> Program Manager Telephone: ( 09) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 4ClFDRC1 <br /> Laurie A.Catulia,R.E.H.S. Fax: (20 9) 464-0138 Robcrl McClcllon,REI-I.S. <br /> Program Mairogvi- Mark Barcellos, R.E.H.S. It <br /> t <br /> � +;011 <br /> HELEN HIGGINS APR Z©� <br /> PO BOX 369 <br /> CLEMENTS CA 95227 <br /> RE: Vogue Cleaners SITE CODE: 231032 <br /> 2315 N. California St. ROM 607 <br /> Stockton, CA., 95204 SWRCB-CUF#: 011775 <br /> San Joaquin County Environmental Health D partment (SJCEHD) has reviewed <br /> Site Conceptual Model dated. February 23, 2005 as submitted by your <br /> consultant, Foothill Engineering (FE) and has he following comments. <br /> This comprehensive report included soil and ground water analytical data <br /> obtained from June 1996 to September 2004. Ground water flow direction and <br /> migration rate data linked with soil contamination data allowed for generalized <br /> interpretation of impact to the subsurface f om the two underground storage <br /> tanks (USTs) removed from this site. <br /> One of the USTs contained gasoline used for the cleaner's delivery operations <br /> and the other UST held Stoddard solvent used in the cleaning process. <br /> Monitoring wells have been installed to investigate the lateral and vertical extent <br /> of the releases from the USTs. <br /> Monitoring well installation construction detail are incorporated into the identities <br /> of the nine monitoring wells associated with this site. Four monitoring wells are <br /> clustered (separate casings with different screen intervals in separate boreholes <br /> in close proximity to one another). Monitorin wells MW-2 thru MW-5 each have <br /> one. of two letter designations appended to each well identity. An "S" is <br /> appended for the shallow screened well, as in MW-5S (screened 35 feet to 55 <br /> feet below ground surface, 'bgs) and a "D" i appended, as in MW-5D, for the <br /> deeper screened well (screened 70 to 75' bgs). Only MW-1 has a single casing <br /> screened.50 to 70' bgs and no appended lettE r designation. <br /> To characterize the severity of the contamin nts impact to the subsurface (soil <br /> and ground water) FE compared the con istent positive results (laboratory <br /> analytical data) against Federal Environmental Protection Agency (USEPA) <br /> Maximum Contaminant Levels (MCL's) and not California (CAEPA) MCL's. By <br /> using the higher USEPA MCL's, FE minimized the apparent severity of impact to <br /> the subsurface compared to the criteria more commonly utilized by California <br /> regulatory agencies. <br />