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San Joaquin County DIRECTOR
<br /> Donna Heran,REHS
<br /> o °u'" .� Environmental Health Department
<br /> . O ASSISTANT DIRECTOR
<br /> L
<br /> 600 East Main Street Laurie Cotulla,RENS
<br /> N Stockton, California 95202-3029 PROGRAM COORDINATORS
<br /> :. Mike Huggins,REHS,RDI
<br /> Margaret Lagorio, REHS
<br /> Website: www.sjgov.org/ehd Robert McCleilon,REHS
<br /> Phone: (209) 468-3420 Jeff Carruesco,REHS,RDI
<br /> Fax: (209) 464-0138 Kasey Foley,REHS
<br /> July 14, 2009
<br /> Mr. Sergio Morescalchi
<br /> Atlantic Richfield Company
<br /> Post Office Box 1257
<br /> San Ramon, California 94583
<br /> Subject: ARCO Service Station No. 2186
<br /> 3212 North California Street
<br /> Stockton, California 94570
<br /> By letter dated June 30, 2009, Atlantic Richfield Company (ARC) recommended a
<br /> reduction of sampling wells: MW-1 R, MW-1 D, VW-1A and B, VW-2A and B, and VW-3A
<br /> and B, associated with the above-referenced site, from quarterly to semi-annually, to
<br /> comply with the State of California Water Resources Control Board Resolution No. 2009-
<br /> 0042.
<br /> The San Joaquin County Environmental Health Department (EHD) approves the
<br /> proposed sampling schedule for wells VW-1A and B, VW-2A and B, and VW-3A and B;
<br /> however, newly installed monitoring wells MW-1R, MW-1D, and MW-3R must be
<br /> sampled quarterly for at least three consecutive quarters before beginning the semi-
<br /> annual sampling schedule. MW-1R, MW-ID, and MW-3R had not been developed
<br /> when first sampled on June 10, 2009. For this reason, the EHD believes the wells
<br /> should be sampled for two additional quarters to assure that the groundwater data
<br /> reported for the newly installed wells are reliable.
<br /> In summation, the EHD approves the following sampling schedule:
<br /> • Quarterly sample MW-1R, MW-1D, and MW-3R during the third and fourth
<br /> quarters 2009 and analyze the samples for gasoline-range organics, benzene,
<br /> toluene, ethyl benzene, and total xylenes (BTEX), methyl tertiary-butyl ether
<br /> (MTBE), tertiary-butyl alcohol (TBA), and 1,2-dichloroethane (1,2-DCA).
<br /> • Semi-annually sample MW-4, VW-1A and B, VW-2A and B, and VW-3A and B,
<br /> and analyze the samples for gasoline-range organics, BTEX, MTBE, TBA, and
<br /> 1,2-DCA.
<br /> • Annually sample MW-2, MW-5, MW-6, MW-7, MW-8, and VW-4 and analyze
<br /> the samples for gasoline-range organics, only.
<br /> If you have any questions regarding this letter, please contact Vicki McCartney at (209)
<br /> 468-9852, or by e-mail at vmccartney@sjcehd.com.
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