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California Regional Water Quality Control Boarda V01 <br /> Central Valley Region '"W� <br /> Karl E.Longley,SCD,P.E.,Chair <br /> Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Arnold <br /> Secretaryfor Phone(916)464-3291 •FAX(916)464-4645 Schwarzenegger <br /> Environmental http://www.waterboards.ca.gov/centralvalIcy Governor <br /> Protection <br /> 21 April 2009 <br /> Ms. Janet Heikeld APR 2 3 2009 <br /> Olympian ENVIRONMENT HEALTH <br /> 1300 Industrial Road, Ste. 2 PERMIT/SERVICES <br /> San Carlos, CA 94070 <br /> DOCUMENT REVIEW, JIMCO TRUCK PLAZA, 1022 EAST FRONTAGE ROAD (AKA 22502 <br /> SOUTH HIGHWAY 99), RIPON, SAN JOAQUIN COUNTY(REGIONAL BOARD <br /> CASE# 390718) <br /> 1 reviewed the Re: Report Submittals (Letter), received 20 April 2009 from your consultant, <br /> Conestoga-Rovers and Associates (CRA) and written in response to the 13267 Order (Order) <br /> dated 25 March 2009. The Letter acknowledges the Order required deadline for quarterly <br /> reports submittal by the 30th day of the first month following the sampled quarter, and requests <br /> an unspecified delay in submittal of the Order required Corrective Action Plan (CAP) due <br /> 1 July 2009. In phone conversation initiated by CRA on 7 April 2009, Mr. Ron Scheele also <br /> acknowledged the submittal of prior ownership information in the next monitoring report as <br /> required in the Order. The Letter states that completion of an additional site assessment <br /> investigation to the southeast of the truck wash will assist in formulating the CAP, that <br /> preliminary data collected by Cone Penetrometer Testing soil and grab groundwater samples, <br /> in conjunction with the existing monitoring well data, are currently inadequate to determine the <br /> extents of the underground storage tanks (USTs) release versus a suspected above-ground <br /> storage tanks (ASTs) release to the southeast of the truck wash. In place of the CAP, the <br /> Letter proposed the submittal by 1 June 2009 of a Site Assessment Work Plan (Workplan) <br /> and a schedule to install additional monitoring wells. <br /> Maximum 4th quarter of 2008 groundwater monitoring results from monitoring wells near the <br /> known USTs release were total petroleum hydrocarbons as gasoline (TPHg), 330 micrograms <br /> per Liter (ug/L); TPH as diesel (TPHd), 33,000 ug/L; benzene, 64 ug/L; methyl tert-butyl ether <br /> (MTBE); 230 ug/L; and tertiary butyl ether (TBA), 1,500 ug/L. In contrast during that quarter, <br /> groundwater monitoring results from MW-6, which is located 80 feet crossgradient of the USTs <br /> release and is the nearest monitoring well to the ALTs, reported TPHg, 170 ug/L and TPHd, <br /> 54,000 ug/L with no detections of benzene, MTBE, or TBA. There appears to be a correlation <br /> with the presence or absence of benzene, MTBE, and TBA in groundwater that may assist to <br /> define both the USTs release and the ALTs release. Since Regional Board regulatory staff <br /> are overseeing both USTs and AGTs cases, and since the AGTs investigation should not hold <br /> up the USTs CAP, there is no opposition to addressing the AGTs investigation in a separate <br /> investigation Workplan within the proposed time frame; however, the Order noted that <br /> additional investigations and several pilot studies for the USTs release have been completed <br /> since 1999, and to date, remedial action has not been implemented- Therefore, staff believes <br /> that adequate information exists to address the USTs release in a CAP, which is an evaluation <br /> of remedial alternatives already tested with a recommendation for a preferred remedial <br /> California Environmental Protection Agency <br /> Oa Req,cled Paper <br />