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L � <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> �.•'_�t'•.O Donna Heran,REHS <br /> 1868 East Hazelton Avenue <br /> a: PROGRAM COORDINATORS <br /> Stockton, California 95205-6232 Robert McClellon,REHS <br /> •'• Jeff Carruesco,REHS,RDI <br /> •. �P Website: www.s r /ehd Kasey Foley,REHS <br /> �gov.og Linda Turkatte,REHS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> August 28, 2012 <br /> Mr. Jerry Moore <br /> Moore Petroleum <br /> 885 Portofino Drive <br /> Brentwood, CA 94513-6539 <br /> Subject: Moore Petroleum Bulk Plant <br /> 5491 F Street <br /> Banta, CA 95304 <br /> The San Joaquin County Environmental Health Department (EHD) has been considering your <br /> site for a "No Further Action Required" (NFAR) status and has discussed your site with a <br /> representative of the Central Valley Regional Water Quality Control Board (CVRWQCB). The <br /> EHD has prepared a case closure summary (CCS) for your site to submit to the CVRWQCB for <br /> a 30-day closure notification, and a 30-day public participation period has been conducted for <br /> the EHD to receive comments and concerns from potentially affected local landowners and <br /> residents. <br /> During the public participation period, the EHD received one telephone inquiry and two <br /> comment letters. The telephone inquiry was in regard to possible physical effects on the caller's <br /> well from the site contamination, one letter writer was under the mistaken impression that the <br /> business was closing rather than the leaking underground storage tank (LUST) case, and the <br /> other letter writer was attributing severe health issues to methyl tert-butyl ether (MTBE) in <br /> groundwater affecting their drinking water. <br /> The health-related letter raised an immediate concern, and reviewing the site data it was found <br /> that the letter was from the owner of the Rhodes Well at 5451 F Street, which has had two <br /> recorded MTBE hits - one in October 2000 (14 micrograms per liter{lag/L}), and the other in July <br /> 2002 (64 pg/L). The well has been `non-detect' during monthly sampling for all chemicals of <br /> concern from August 2002 through December 2008. The second letter writer's well has been <br /> sampled once (the "Marty Well" at 5389 F Street), in November 2000, and was found to be `non- <br /> detect' for total petroleum hydrocarbons quantified as gasoline (TPHg), benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX) and the five fuel oxygenates, including MTBE. Most <br /> domestic wells in the area have not been sampled for the chemicals of concern from the <br /> unauthorized release from the underground storage tank (UST) system on the site. <br /> The sensitive receptor survey .reports prepared for the site (2000 and 2006) indicate that all <br /> residential parcels are on well water. The hydrogeological framework of the immediate area is <br /> characterized by the common occurrence of sand, silt and clay at depths less than 24 feet <br /> below surface grade (bsg) and abundant sand from approximately 24 feet to at least 80 feet bsg <br /> with subordinate silt and clay occurring variably between 47 and 55 feet bsg as identified on the <br /> logs for CPT1 and CPT2; the abundance of sand at depth is also reflected on the Driller's Log <br /> for the Rhodes well from 62 to 65 feet bsg; the log shows a total of 15 feet of sand in the <br /> Domestic Well sampling Directive Letter 0812 <br />