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p. California 'egional Water Quality Cobol Board <br />Central Valley Region <br />Linda S. Adams <br />rctaryfor <br />1 .,nn ,,n,nen tal <br />PrOleellon <br /> <br />Arnold <br />Schwarzenegger <br />Govemor <br /> <br />Sacramento Main Office <br />04 11020 Sun Centerpri>«,,-- 200. Rancho Cordova. California 95670-6114 <br /> <br />i' ID ' 64-3291 • FAX (916) 464-4645 <br /> <br />REC.R...Npil r .waterboards.ca.govicentralvalley <br />12 December 2006 DEC 1 5 2.006 <br /> <br />Ms. Donna Sartini-GardlidPONMENT HEALTh <br />1206 W. Struck Ave. PERWT,ISERVICES <br />Orange, CA 92867 <br />Mr. Ronald Jr. and Ms. Bonnie Barber <br />10411 Small Rd. <br />Manteca, CA 95336 <br />DOCUMENT REVIEW, DONNA GARDNER PROPERTY, 26056 N THORNTON ROAD, <br />THORNTON, SAN JOAQUIN COUNTY (REGIONAL BOARD CASE # 390412) <br />in a ieiter dated 29 September I requested the following actions: <br />By 31 October 2006, resume quarterly monitoring of monitoring wells MW-1 through <br />MW-6 and Well #2 for all petroleum hydrocarbon constituents of concern reported to <br />date, including TPHg, benzene, toluene, ethylbenzene, xylenes, the five fuel <br />oxygenates, lead scavengers 1,2-dicholorethane and ethylene dibromide, methanol and <br />ethanol. Analytical Method Detection Limits shall be sufficiently low for comparison of <br />the results to the lowest applicable Water Quality Objectives, which may be <br />downloaded from the website listed in the header of this letter. <br />By 31 October 2006, submit a workplan for an additional investigation to determine <br />whether pumping from Well #2 hydraulically influences shallow groundwater. I strongly <br />suggest that well data loggers be used in selected monitoring wells to record any <br />fluctuations in water levels over a period of time sufficient to show a response from <br />pumping of Well #2. A report of the investigation including all data and graphs, is due <br />3 January 2006, and shall provide conclusions and recommendations for additional <br />investigation or remediation, if warranted. <br />Submit all documents (workplans and reports) and data in electronic format to <br />Geotracker, as required by the State Water Resources Control Board. <br />On 1 December 2006 your consultant Advanced GeoEnvironmental Inc (AGE) submitted the <br />Static Water Level Monitoring Work Plan for evaluating Well #2. Data loggers will be installed <br />in monitoring wells MW-1 though MW-4 (enclosed figure), and the usage times and duration of <br />pumping of Well #2 will be compared against any changes recorded in water levels in the <br />monitoring wells. The data will be adjusted electronically to compensate for changes in <br />atmospheric pressure, and precipitation records will be included to consider effects of soil <br />infiltration as related to changes in water levels. The proposed duration of the test will be one <br />month of collecting the data, which will be compiled and analyzed for the report. The test will <br />be conducted in a non-intrusive manner due to the suspected aquitard separating the <br />groundwater pollution from the public supply well zone of influence. <br />California Enviromnental Protection Agency <br />Z:13i Recycled Paper