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San Joaquin County DIRECTOR
<br /> �P , Donna Heran, REHS
<br /> �o\ Environmental Health Department
<br /> ASSISTANT DIRECTOR
<br /> �Z. 600 East Main Street Laurie Cotulla, REHS
<br /> `j Stockton, California 95202-3029
<br /> PROGRAM COORDINATORS
<br /> - --- -- - - -- - -- Mike Huggins, REHS, RDI
<br /> c ,'/ Margaret Lagorio, REHS
<br /> F6 0 T4 Website: www.sjgov.org/ehd Robert McClellon, REHS
<br /> - Phone: (209) 468-3420 Jeff Carruesco, REHS, RDI
<br /> Fax: (209) 464-0138 Kasey Foley, REHS
<br /> May 19, 2009
<br /> Mr. Dan Silva
<br /> Ms.Tina Mayhew
<br /> West Clay Properties
<br /> Post Office Box 6152
<br /> Stockton, California 95206
<br /> Subject: West Clay Properties
<br /> 639 West Clay Street
<br /> Stockton,California 95206
<br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Quarterly Report
<br /> -Fourth Quarter 2008, dated February 10, 2009, along with historical data submitted by Advanced
<br /> GeoEnvironmental, Inc. (AGE) on your behalf for the above-referenced site. Based on
<br /> groundwater analytical results submitted to date, the EHD directs implementation of the following
<br /> sampling schedule:
<br /> • Semi-annually sample monitoring and extraction wells: MW-1, MW-2, EW-1, EW-2, and
<br /> MW-14B;
<br /> • Annually sample monitoring wells: MW-9, MW-10, MW-11B, MW-16, MW-21, MW-25,
<br /> and MW-26;
<br /> • Biennially sample monitoring wells: MW-3, MW-4, MW-5, MW-7, MW-8A, MW-8B,
<br /> MW-11A, MW-12A, MW-12B, MW-13A, MW-13B, MW-14A, MW-17, MW-18, MW-
<br /> 19, and MW-20;
<br /> • Discontinue sampling monitoring wells: MW-22, MW-23, and MW-24.
<br /> There are two identified regions of contamination at this site, the "cluster underground storage tank
<br /> (UST)" area to the north, and the "UST No. 3" area to the south. The EHD directs that samples
<br /> collected from wells associated with the northern "cluster USTs" be analyzed for total petroleum
<br /> hydrocarbons quantified as gasoline (TPH-g); benzene, toluene, ethyl benzene, and total xylenes
<br /> (BTEX); methyl tertiary-butyl ether (MTBE), and 1,2-dichloroethane (1,2-DCA). Analyze
<br /> groundwater samples collected from monitoring wells associated with the southern "UST No. 3"
<br /> area for TPH quantified as diesel (TPH-d) and tertiary-amyl methyl ether (TAME), in addition to
<br /> the above analyses.
<br /> Concentrations of TPH-g and MTBE have increased recently in groundwater collected from
<br /> MW-14B, screened between sixty-five and seventy feet below surface grade (bsg). TPH-g
<br /> concentrations were less than 50 micrograms per liter (µg/L) from December 2002 to February
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