Laserfiche WebLink
San Joaquin County <br /> °"'" Environmental Health Department <br /> DIRECTOR <br /> 2' � G 600 East Main Street Donna Heran, REHS <br /> Q: <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon, REHS <br /> Jeff Carruesco, REHS, RDI <br /> Website: www.Sjgov.org/ehd Kasey Foley, REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> September 7, 2010 <br /> Mr. Dung Thanh Phan and Ms. Nhuan Thi Phan <br /> 3524 Morningside Drive <br /> Stockton, California 95219 <br /> Subject: California Stop <br /> 2224 Manthey Road <br /> Stockton, California 95206 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Groundwater <br /> Batch Removal and First Quarter 2010 Groundwater Monitoring Report (report), dated 15 <br /> March 2010, prepared and submitted by your consulting firm Advanced GeoEnvironmental, <br /> Inc. (AGE) for the above-referenced subject site. In the report, AGE describes the five <br /> groundwater batch removals between 11 January and 26 January 2010, involving monitoring <br /> wells MW-1 through MW-3 and MW-6 as extraction points. AGE concludes that groundwater <br /> batch removal appears to be an effective method for inducing hydraulic control of the methyl <br /> tertiary-butyl ether (MTBE) plume while drawing the MTBE contamination toward the <br /> extraction points for removal. AGE estimates that a total of 0.32 pounds of MTBE were <br /> removed from the 27,400 gallons of groundwater extracted during the five batch removals. <br /> Based on these findings, AGE recommends that an interim groundwater remedial action work <br /> plan that includes the installation of a permanent groundwater extraction system be submitted. <br /> The proposed work plan would include the installation of a four-inch diameter groundwater <br /> extraction well (EW-1) screened between approximately twenty and thirty-five feet below <br /> surface grade, as was previously approved by the EHD by letter dated 10 September 2008; <br /> and an evaluation of the cost effectiveness of treatment and/or disposal of the dissolved <br /> petroleum additives MTBE, tertiary butyl alcohol (TBA), ethyl tertiary butyl ether (ETBE) and <br /> tertiary-amyl methyl ether (TAME). Before the EHD will comment on submittal of the <br /> proposed work plan, you must first submit a corrective action plan (CAP) that compares <br /> various groundwater remedial methods to determine the most cost-effective method for <br /> removing the MTBE plume based on site specific data. Submit the CAP to the EHD by 01 <br /> November 2010. <br /> By letter dated 15 October 2008, the EHD conditionally approved the advancement of eight <br /> cone penetration test (CPT) borings and the collection of grab groundwater samples from <br /> discreet borings advanced adjacent to the eight proposed CPT soil borings. Data acquired <br /> from the CPT investigation would be utilized to determine the number, location, and screened <br /> interval for future monitoring wells. By letter dated 05 June 2009, the EHD approved an <br /> extension to advance the eight CPT borings to the second quarter 2010. To date these CPT <br /> borings have not been advanced at this site. You are now directed to submit an encroachment <br /> permit from the California Department of Transportation (Caltrans), a boring permit application <br /> and permit inspection fee per parcel to the EHD and complete the fieldwork by 01 December <br /> 2010 <br />