SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

San Joaquin County DIRECTOR Donna Heran, REHS Environmental Health Department ASSISTANT DIRECTOR c :?y 600 East Main Street Laurie Cotulla, REHS U): ' s :` Stockton, California 95202-3029 PROGRAM COORDINATORS Carl Borgman,RENS CALIijR'�\P Website: www.sjgov.org/ehd Mike Huggins,REHS, RDI Margaret Lagorio, REHS Phone: (209) 468-3420 Robert McClellon,REBS Fax: (209)464-0138 Jeff Carruesco, REHS, RDI May 13, 2008 Kasey Foley, REHS Ashraf and Yasmin Alis 20 Twelve Oaks Drive Pleasanton, California 94566 Subject: Fast and Easy Mart No. 38 244 West Harding Way Stockton, California The San Joaquin County Environmental Health Department has reviewed Additional Site Assessment Work Plan dated April 1, 2008, submitted by Advanced GeoEnvironmental, Inc. (AGE) on your behalf for the above-referenced site. to the work plan, AGE proposes to install one additional monitoring well (MW-5) to assess and monitor the impact of petroleum hydrocarbons in soil and groundwater west of the above-referenced site. The EHD approves the work plan as submitted. Soil samples will be collected at five-foot intervals for lithological evaluation, and to check for the presence of hydrocarbon staining, odor, and to screen hydrocarbon concentrations using a photo-ionization detector. Although groundwater is reported currently at approximately twenty-four feet below surface grade (bsg), the proposed monitoring well will be screened from approximately twenty-five to forty-five .feet bsg. Soil and groundwater samples will be analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g); benzene, toluene, ethyl benzene, and total xylenes (BTEX); methyl tertiary- butyl ether (MTBE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), di- isopropyl ether (DIPE), tertiary butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA), and 1,2- dibromoethane (EDB). By letter dated December 12, 2006, the EHD approved reducing the sampling frequency from quarterly to annually for groundwater samples collected from MW-2 and MW-3 since contaminants of concern have not been detected in groundwater samples collected from these wells. The EHD also directed that depth-to-water measurements continue to be measured quarterly for the purpose of determining the groundwater gradient. The first quarter 2008 report shows that samples were collected from MW-3 and MW-4 during the fourth quarter 2007 and first quarter 2008. The EHD directs that groundwater samples be collected annually from MW-2 and MW-3 and analyzed for TPH-g, BTEX, and MTBE.