SITE INFORMATION AND CORRESPONDENCE FILE 1

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it ENVIRONMENTAL HEALTH i1EPARTMENT Donna K. Heran, R Pp U, lN E.H.S. SAN JOAQUIN COUNTY S 2 Pro ram Coordinatorsa i a . Director 304 East Weber Avenue, Third Floor Carl Borgman, R.E.H. S . Laurie A. Cotulla, R,E.H,S, Stockton, California 95202-2708 Mike Huggins, R.E.H. S., R.D.I. c92iFoap c Assistant Director Telephone: (209) 468-3420 Margaret Lagono, R.E.H. S . Robert McClellon, R.E.H.S. Fax: (209) 464-0138 Jeff Carruesco, R.E,H.S . Website: www.sjgov.org/ehd/ Kasey Foley, R.E.H.S. OCT r s 2006 ROGER HUCKINS FERNANDO HATCHER 3436 ADMIRAL DRIVE 1201 S CENTER ST STOCKTON CA 95209 STOCKTON CA 95206 RE : Fernando's Place Site Code: 505309 1201 S . Center St. (APN : 14716003) RO#: 0233 Stockton , CA 95206 SWRCB-CUF#: 012186 San Joaquin County Environmental Health Department (EHD ) has reviewed Cone Penetration Testing Site Investigation — June 2006 (Report) as uploaded to Geotracker and has the following comments , In correspondence dated January 23, 2006 , the EHD expressed concerns about your written proposal to place additional continuous , multi-chambered , extruded tubing (CMT) monitoring wells and to conduct ground water extraction (GWE ) prior to completion of the lateral and vertical delineation of the dissolved petroleum ground water plume ; therefore the proposals were not approved , Borings "CPT-07" and "CPT-08" were installed during June 2006 to address the dissolved plume delineation concerns . Based on the reported results of the investigation and previously acquired site data , the EHD still has a number of concerns with the site as noted below: 1 , A lack of vertical ground water plume delineation near MW-4 and MW-5 ; 2 . The lack of lateral ground water plume delineation in all five hydrological units (HU ), particularly toward the north and the east and toward the residential areas ; 3 , A lack of monitoring wells with screened intervals between 40 feet below ground surface (' bgs) and 100' bgs ; 4, The potential for vapor intrusion to the nearby residences located around the site has not been evaluated . Some of these houses appear to have either half or full basements and are very close to monitoring wells with elevated levels of dissolved petroleum in the ground water; 5 , The lack of sorbed and dissolved contaminant mass estimates for the site , and 6, The apparent instability of the dissolved plume .