Laserfiche WebLink
ENVIRONMENTAL HEALTH bEPARTMENT <br /> O.PQUrN'•C SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> J <br /> 304 East Weber Avenue, Third Floor <br /> U% Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> c4{ F o.R�,. Laurie A.Cotulia,R.E.H.S. Robert McClellon,R.E.H.S. <br /> i Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> Program Manager <br /> RAY BAGLIETTO & FRANK RAUZI APR 0 3 2002 <br /> TULEBURGE WAREHOUSE <br /> 301 AURORA ST <br /> STOCKTON CA 95202 <br /> RE: SPEEDY FOOD MART <br /> 8200 N HWY 99 <br /> STOCKTON CA 95212 <br /> Environmental Health Department (EHD) has received FourlhQuarter Groundwater Monitoring <br /> and Sampling Report(the report) dated January 21, 2002 prepared by Ground Zero Analysis, <br /> Inc. (Ground Zero). Monitoring Well#1 (MW-1) was not sampled during the months of <br /> August and November 2001 due to the presence of free product. Compared to the previous <br /> quarter (August samples), the concentration of methyl tert-butyl ether (MTBE) in <br /> groundwater samples from MW-3 and MW-6 rose to 4,900 and 3,700 micrograms per liter <br /> (µg/L), respectively,but fell to 12,000 Etg/L in MW-4 . Groundwater depression was again <br /> depicted around the recently destroyed water supply well at the site. <br /> The extent of the groundwater contamination plume is not defined. Due to the continual <br /> detection of high concentrations of MTBE in the groundwater samples of the north-most <br /> well MW-6, and the presence of private drinking water wells north of the site, there is great <br /> urgency to define the groundwater plume and implement measures to control the plume <br /> from impacting the existing private drinking water wells. Submit a work plan that will define <br /> the extent of the contamination plume in groundwater to EHD by May 15,2002. <br /> According to Step 3 within the State Water Resources Control Board (SWRCB) Guidelines <br /> for Investigation and Cleanup of MTBE and other Oxygenates final draft dated 30 March <br /> 2000, sites with persistent concentrations of MTBE over 10,000 ppb should perform interim <br /> remediation to reduce the concentrations and mass before the plume can spread. <br /> According to the SV,/RCB Guidelines geologic data should be gathered and used to estimate <br /> the approximate travel time for the contaminant plume to reach nearby receptors. If the <br /> contaminant travel time to the nearest receptor is estimated to be less than 5 years, then a <br /> remedial action plan should be implemented in less than a year. Submit a work plan to <br /> evaluate feasibility and cost-effectiveness of at least two remediation alternatives that will <br /> control the contamination plume to EHD by June 1,2002. <br /> For the fourth time since the sampling event in September 2000, a groundwater depression <br /> around the now destroyed water supply well was again reported in the report. Groundwater <br /> gradient flow direction previously has alternated between the north and the east. EHD <br />