Laserfiche WebLink
San Joaquin County DIRECTOR <br /> °"'" REHS <br /> Environmental Health Department Donna Heran, ECT <br /> �o._�.c� ASSISTANT DIRECTOR <br /> 2' ` Z 600 East Main Street Laurie Cotulla, REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> — Carl Borgman, REHS <br /> Mike Huggins, REHS, RDI <br /> 4�/F0 <br /> 0 � Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 ,teff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> November 4, 2008 <br /> Mr. Weldon Church <br /> 1958 Yosemite Road <br /> Berkeley, California 94707 <br /> Subject: Weldon Church Property <br /> 104 West Beverly Place <br /> Tracy, California 95376 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed historical <br /> analytical data for the above-referenced site and does not believe natural attenuation has <br /> significantly decreased the contaminant mass in soil, estimated by Advanced GeoEnvironmental, <br /> Inc. (AGE), to be approximately 4,350 pounds of total petroleum hydrocarbons quantified as <br /> gasoline (TPH-g). Based on analytical results for groundwater samples collected quarterly from <br /> July 1996 through the first quarter 2008, it appears that monitoring wells MWA and MW-4 <br /> continue to be impacted with contaminants of concern. During the fourth quarter 2007, TPH-g <br /> was detected in groundwater samples collected from monitoring well MW-3 for the first time. <br /> Since MW-3 was not sampled during the first quarter 2008, it is unclear whether the petroleum <br /> hydrocarbon plume is migrating to the east. Noting these concerns and considering this site is in <br /> a residential area, the EHD directs that a corrective action plan be submitted by February 25, <br /> 2009,that includes several methods for site remediation. The recommended remedial technology <br /> should be well supported by an analysis for cost-effectiveness. <br /> Fieldwork proposed in Soil Vapor Survey Work Plan - Addendum dated July 09, 2007, was <br /> implemented on April 7, 2008. The work plan was prepared and submitted by AGE, and <br /> approved by the EHD by letter dated July 25, 2007. Following the advancement of soil borings <br /> B25-6 and B26-6, fieldwork was terminated when a sewer line was pierced and safety concerns <br /> surfaced due to close proximity of additional utility lines. You are directed to submit a new work <br /> plan to the EHD by January 5, 2009, for evaluating the potential for vapor intrusion into the <br /> structures at the site, and for determination of the lateral extent of petroleum-hydrocarbon <br /> contamination in soil. Include maps showing detailed locations of above-and underground utility <br /> lines. <br /> During the sampling event on December 10,2007, when all eight monitoring wells were sampled, <br /> groundwater was not analyzed for 1,2-dichloroethane (1,2-DCA). Please sample all monitoring <br /> wells during the fourth quarter 2008 sampling event and analyze groundwater samples for TPH-g; <br /> benzene, toluene, ethyl benzene, total xylenes (BTEX); methyl tertiary-butyl ether (MTBE), and <br /> 1,2-DCA. During the first quarter 2009 sampling event,resample those wells where contaminants <br /> of concern were detected in groundwater samples collected the previous quarter. <br />