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<br /> San Joaquin County DIRECTOR
<br /> oP' . . . . . . Environmental Health Dep„ artment Donna Heren, REFS
<br /> ). • ' "� .O M ASSISTANT DIRECTOR
<br /> 600 East Main Street Laurie Cotulla, REFS
<br /> Stockton , California 95202-3029
<br /> PROGRAM COORDINATORS
<br /> Carl Bergman, REFS
<br /> Website: WWw.S OV. o /8hd Mike Huggins, REFS, RDI
<br /> Q _ i O ORS Jrg 5 Margaret Lagorio, REFS
<br /> Phone: (209) 4680,3420 Robert McClellon, REFS
<br /> Fax: (209) 464-0138 Jeff Carruesm, REFS , RDI
<br /> Kasey Foley, REFS
<br /> March 26, 2009
<br /> Mr. David Atwater
<br /> Van De Pot Enterprises, Incorporated
<br /> Post Office Box 1107
<br /> Stockton, California 95201
<br /> Subject: Pacific Pride - South El Dorado Street
<br /> 3147 South El Dorado Street
<br /> Stockton, CA 95206
<br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Request for
<br /> Reduction of Monitoring Activities submitted on your behalf by Advanced GeoEnvironmental,
<br /> Inc . (AGE) by letter dated February 13 , 2009 . AGE has requested a reduction in sampling of all
<br /> wells to an annual event. To support the appearance that the groundwater plume is stable, AGE
<br /> has included analytical results for groundwater samples collected quarterly at your site from
<br /> December 1999, to August 2008 .
<br /> The EHD concurs that the analytical data demonstrate that the petroleum hydrocarbon plume
<br /> appears to be stable. Therefore, the EHD approves the following sampling schedule.
<br /> • Collect groundwater samples from monitoring wells MW- 1 and MW-7 semi-annually
<br /> and analyze the samples for total petroleum hydrocarbons quantified as diesel (TPH-d);
<br /> total petroleum hydrocarbons quantified as gasoline (TPH-g); benzene, toluene, ethyl
<br /> benzene, and total xylenes (BTEX); methyl tertiary-butyl ether (MTBE); 1 ,2-
<br /> dichloroethane ( 1 ,2-DCA); and tertiary-amyl methyl ether (TAME).
<br /> • Collect groundwater samples annually from monitoring wells MW-2, MW-4, MW-5 ,
<br /> MW-6, MW-8A, MW-813, MW-9A, MW- 10A, MW-1013, and MW- IOC and analyze
<br /> the samples for TPH-g, BTEX, MTBE, 1 ,2-DCA, and TAME.
<br /> • Collect groundwater samples biennially from monitoring wells MW-8C, MW-9B,
<br /> MW-912, MW-9D, MW- IOD, MW- 11A, MW- 1113 , MW- 11C MW- 11D, MW- 12A.
<br /> MW- 12B, MW- 12C, and MW- 12D and analyze the samples for TPH-g, BTEX, MTBE,
<br /> 1 ,2-DCA, and TAME. (Please note that the analysis of total petroleum hydrocarbons
<br /> quantified as kerosene (TPH-k) has been removed from the analytical list.)
<br /> To determine groundwater flow direction, collect depth-to-water measurements from wells
<br /> screened within the first water zone (MW- 1 , MW-2, MW-4, MW-6, MW-7, MW-9A MW-10A,
<br /> MW- 11A and MW-12A) when sampling wells MW- 1 and MW-7 semi-annually. When sampling
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