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1 <br /> r II <br /> cuA - <br /> }°P � S AIS JOAQUIN COUNTY <br /> f'ro rtazzz Coordinators - <br /> ?� Donna l�. .l�ez•an, R.E.H.S. g <br /> 304 East Weber Avenue,T hirci Floor" Cart Borgman, R.E.H.S. <br /> IIS .Director <br /> g <br /> C Mike Huggins, R.E.H.S. R.D.T. <br /> ,. Laurie A. Cotulla,R.>E.K.S. Stockton,California 95202-2708 �c , <br /> Assistant Director Telephone: (209)468-3420 Margaret Lagorio, R.E.H.S.4r <br /> i;'w Robert McClellon,R.E.H.S. <br /> Fax: (209)464-01.38 Jeff Carruesco, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Ka-ey Foley, R.E.H.S. <br /> JERRY MOORE OR 1 1 20017, <br /> MOORE PETROLEUM <br /> 976 W MARIPOSA AVE <br /> STOCKTON CA 95204 <br /> RE: Quarterly Monitoring Report Recommendation and the Proposed <br /> Cancellation of the MW-15 Installation. <br /> 5491 F Street <br /> Banta CA 95304 <br /> V <br /> San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Third Quarter 2006 Groundwater Monitoring and Remediation Report, dated <br /> 19 December 2006, First Quarter 2007 Groundwater Monitoring and Fourth Quarter <br /> Remediation Status Report, dated 08 February 2007, the letter dated 22 February 2007 <br /> with the subject Update on Status of Proposed Monitoring Well MW-95 (letter); and <br /> Limited Subsurface Site Investigation Results Report (site investigation report) dated 30 <br /> March 2006, all prepared by Apex Envirotech, Inc. (AEI) on your behalf. <br /> Both quarterly reports recommend reducing the monitoring frequency of monitoring wells <br /> MW-5 and MW-6 to an annual basis. Based on the locations of these wells and their <br /> monitoring history, the EHD approves this recommendation. Additional reductions of <br /> sampling select wells and/or reductions of the analytical regimens will be considered by <br /> the EHD if proposed by you with an adequate demonstration that all monitoring <br /> objectives will still be met with the proposed reductions. <br /> In their February letter, AEI recommends waiving installation of the approved monitoring <br /> well MW-15 as the railroad company that owns the land is not being cooperative with <br /> you, the costs to install it are deemed to be unreasonably high and the groundwater flow <br /> direction has shifted toward the north over the last year of monitoring. The EHD cannot <br /> approve waiving installation of the previously approved ed MW-15 for the following reasons: <br /> Installation of MW-15 was approved to delineate and monitor the dissolved <br /> plume in the dawn-gradient direction. The Central Valley Regional Water Quality <br /> Control Board (CVRWQCB) generally will not concur with closure requests for <br /> sites lacking complete dissolved plume delineation.,, <br /> • Sensitive Receptor Survey Results (SRSR), dated 16 August 2006, prepared by <br /> AEI, identified 33.domestic water wells within a 2000-foot radius of the site, 19 of <br /> which are within 500 feet of'your site. The high groundwater usage in this area <br /> increases the importance of complete plume delineation for your site. <br /> t <br /> i <br />