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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.S. Unit Supervisors <br /> N: :< Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> • .; P • Program Manager Telephone: (209)468-3420 Douglas W.Wilson, R.E.H.S. <br /> Qc; o.Ra� Margaret Lagorio,R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> CARL NAVARRA T 2 i 2 G.5 <br /> 475 BLEWETT ROAD <br /> TRACY CA 95376 <br /> RE: Navarra Property Site Code: 1392 <br /> 7500 Eleventh Street <br /> Tracy CA 95376 <br /> San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Potable Wafer Supply Well Water-quality Monitoring (PWM), dated 20 May 2005, prepared by <br /> your consultant The San Joaquin Company, Inc. (TSJCI). Based on four quarters of monitoring <br /> data, TSJCI recommended the following modifications of the monitoring program in effect for the <br /> water supply wells: <br /> • Drop the water supply wells at 24195 Chrisman Road, 7601 W. Eleventh Street, and the <br /> Carmelo Business Park well off Chrisman Road <br /> • Monitor the water supply wells at 7500 W. Eleventh Street, 23950 Chrisman Road and <br /> 23901 Chrisman Road in September and February of each year at the normal times of <br /> seasonal high and low groundwater elevation, as influenced by agricultural pumping; <br /> • Eliminate ethanol, methanol, ethylene dibromide (EDB), and 1,2-dichloroethane (1,2- <br /> DCA) from the analytical regimen for the water supply wells. <br /> Based on the nondetection of these specific potential chemicals of concern in samples collected <br /> quarterly from the water supply wells and the data analysis provided by TSJCI, EHD approves <br /> the proposed revisions to the monitoring program. <br /> If you have any questions or comments you may contact Nuel Henderson at (209) 468-3436. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> 1100111;Z1 e <br /> U <br /> Nuel C. Henderson, Jr., PG Margaret Lagorio, REHS <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James L.L. Barton, CVRWQCB <br /> Dai Watkins, TSJCI <br />