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ENVIRONMENTAL HEALTH DEPARTMENT
<br /> Pa�,N SAN JOAQUIN COUNTY
<br /> 2:' 2 Program Coordinators
<br /> a• Donna K. Heran, R.E.H.S.
<br /> Director 304 East Weber Avenue,Third Floor Carl Borgman, R.E.H.S.
<br /> Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I.
<br /> �q`i Fo.RN�P Assistant Director Telephone: (209)468-3420 Margaret o, R.E.H.S.
<br /> Robert McClelllellon, R.E.H.S.
<br /> Fax: (209)464-0138 Jeff Carruesco, R.E.H.S.
<br /> Website:www.sjgov.org/ehd/ Kasey Foley, R.E.H.S.
<br /> SHELL OIL PRODUCTS US MAR U 5 2007
<br /> DENIS L BROWN
<br /> 20945 S WILMINGTON AVENUE
<br /> CARSON CA 90810
<br /> RE: Ripon Shell Service Station SITE CODE: 506186
<br /> 341 East Main Street RO: 445
<br /> Ripon, California
<br /> San Joaquin County Environmental Health Department (EHD) has reviewed Closure Addendum
<br /> — Vapor Intrusion Analysis, dated November 14, 2006, prepared and submitted by Cambria
<br /> Environmental Technology, Inc. (Cambria) on your behalf for the above-referenced site. EHD
<br /> concurs with Cambria's assessment that vapor intrusion does not appear to pose a threat at this
<br /> site. This is based on the absence of petroleum hydrocarbon concentrations in shallow soil
<br /> samples collected from boring CPT-1 and well EW-1, and groundwater samples collected during
<br /> the last groundwater monitoring event in April 2005.
<br /> EHD has discussed closure consideration for this site with the Central Valley Regional Water
<br /> Quality Control Board(CVRWQCB)and has concluded that since nearly two years have gone by
<br /> since last groundwater samples were collected from monitoring wells at this site, an additional
<br /> sampling event is necessary to assess the current groundwater conditions at this site. You are
<br /> directed to collect groundwater samples from monitoring wells MW-1, MW-2, MW-3, MW-4A,
<br /> MW413, MW-5A, MW-5B, MW-6A, MW-613, and extraction wells EW-1 and EW-2.
<br /> Groundwater samples are to be analyzed for total petroleum hydrocarbons as gasoline (TPH-g);
<br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX); methyl tertiary butyl ether (MTBE),
<br /> ethyl tertiary butyl ether (ETBE), di-isopropyl ether(RIPE), tertiary amyl methyl ether (TAME),
<br /> tertiary butyl alcohol (TBA), methanol, ethanol, 1,2-dichloroethane (1,2-DCA) and 1,2-
<br /> dibromoethane(EDB).
<br /> If you have any questions, please contact Vicki McCartney at (209) 468-3456 or by electronic
<br /> mail at vmccartney@sjcehd.com.
<br /> Donna Heran, REHS,Director
<br /> Environmental Health Department ^/
<br /> !-r 6� v &
<br /> Victoria L. McCartney, Senior REHS Nuel C. Henderson,Jr., PG
<br /> LOP/Site Mitigation Unit IV Engineering Geologist
<br /> LOP/Site Mitigation Unit IV
<br /> c: Joe W. Neely, PG—Cambria
<br /> James L.L. Barton, PG—CVRWQC13
<br /> Matt Machado—City of Ripon
<br /> Jeanne Zolezzi—Herum, Crabtree,Brown
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