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California&gional Water Quality Con A Board
<br /> Central Valley Region
<br /> Karl E.Longley,ScD,P.E.,Chair
<br /> f
<br /> Linda S.Adams Arnold
<br /> Secreraryfor Sacramento Main Office
<br /> 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Schwarzenegger
<br /> Environmental
<br /> Protection Phone(916)464-3291 •FAX(916)464-4645 Governor
<br /> http://www.waterboards.ca.gov/centralvalley ( f I
<br /> 21 April 2008 U �► � �J^U�I�'U
<br /> CERTIFIED MAIL APR d i 2008
<br /> 7007 2560 0001 6522 6355 ENARO1%1EN T HEALTH
<br /> PER(vtlT/SER ICES
<br /> Mr. Kahled Anber
<br /> P.O Box 2121
<br /> Mill Valley, CA 94942
<br /> CHANGE OF LEAD AGENCY, FILE REVIEW, AND DIRECTIVE TO SUBMIT WORK PLAN
<br /> AND PAST DUE REPORTS, AND RESUME QUARTERLY MONITORING, BLUE STAR,
<br /> 4040 EAST MAIN STREET, STOCKTON, SAN JOAQUIN COUNTY
<br /> (REGIONAL BOARD CASE # 391140)
<br /> In a letter received 20 March 2008, the San Joaquin County Environmental Health Department
<br /> (SJCEHD) transferred the regulatory agency lead to the Regional Board for the cleanup of
<br /> petroleum hydrocarbons at Blue Star, 4040 E. Main St., Stockton (Site, enclosed Figure 1).
<br /> Attached is a site chronology prepared by SJCEHD. Please address all future
<br /> correspondence to Regional Board staff at the address in the header of this letter, and
<br /> continue to send copies of written correspondence to SJCEHD.
<br /> On 6 March 2002, one 6,000-gallon and one 12,000-gallon gasoline, and one 4,000-gallon
<br /> diesel underground storage tanks (USTs), two dispenser islands, and associated piping were
<br /> removed from the Site (enclosed Figure 2). Maximum soil confirmation concentrations from
<br /> the UST removal were total petroleum hydrocarbons as gasoline (TPHg), 24 milligrams per
<br /> kilogram (mg/kg); TPH as diesel (TPHd), 0.015 mg/kg; benzene, 0.023 mg/kg;
<br /> toluene, 0.054 mg/kg; ethylbenzene, 0.57 mg/kg; and xylenes, 13.6 mg/kg.
<br /> In April of 2003, your consultant Advanced GeoEnvironmental Inc. (AGE) advanced three soil
<br /> borings (131, B2, and B3, enclosed Figure 2) to 65 feet below ground surface (bgs) to collect
<br /> soil and grab groundwater samples. Maximum soil borings concentrations were total
<br /> petroleum hydrocarbons as gasoline (TPHg), 1,800 mg/kg; TPH as diesel (TPHd), 580 mg/kg;
<br /> benzene, 0.02 mg/kg; toluene, 22 mg/kg; ethylbenzene, 29 mg/kg; and xylenes, 170 mg/kg.
<br /> Maximum grab groundwater concentrations were TPHg, 180 micrograms per Liter (ug/L);
<br /> toluene, 5.6 ug/L; ethylbenzene, 3.0 ug/L; xylenes, 15.5 ug/L; methyl tert-butyl ether (MtBE),
<br /> 68 ug/L; and 1, 2-dichloroethane (1, 2-DCA), 170 ug/L.
<br /> In May of 2005, AGE installed three shallow groundwater monitoring wells (MW-1 through
<br /> MW-3) screened from 60 to 80 feet bgs. Depth to water was 65 feet bgs. Maximum
<br /> groundwater concentrations were: Total Petroleum Hydrocarbons as gasoline (TPHg),
<br /> 200 Ng/L; MtBE, 55 pg/L; and 1, 2-DCA, 190 ug/L.
<br /> California Environmental Protection Agency
<br /> C4Recycled Paper
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