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E COPYPUBLIC hEALTH SERVICFILE <br /> ES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISIONIL <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 �rFOR� <br /> 209/468-3420 <br /> FEB 1 6 2001 <br /> CARL KNOWLES <br /> 1140 W HAMMER LN <br /> STOCKTON CA 95209 <br /> RE: 1140 W HAMMER LANE SITE CODE: 1124 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) is the <br /> lead agency providing the oversight of the investigation and cleanup of releases from <br /> underground storage tanks (UST)within San Joaquin County. PHS/EHD has a contract with <br /> California State Water Resources Control Board (SWRCB)to conduct an UST corrective action <br /> program. <br /> PHS/EHD met with staff from the California Regional Water Quality Control Board (CRWQCB) on <br /> January 24, 2001 to review records for the above referenced site. In the most recent report <br /> prepared by Ground Zero Analysis, Inc. dated November 14, 2000, groundwater results from <br /> monitoring well (MW)#5 were: 46,000 part per billion (ppb)TPH-Gas; 7,600 ppb Benzene; 730 <br /> ppb Toluene; 230 ppb Ethlebenzene; and 2,800 ppb Xylene. In that report, the recommendation <br /> was made by Ground Zero Analysis to close this site as a low-risk contamination case. Due to <br /> these high concentrations of gasoline contaminants in the groundwater at MW #5, site closure <br /> cannot be granted at this time. <br /> To date, eight MWs and four soil borings with groundwater grab samples have been completed. <br /> Historically, MW#5 has evidenced the highest contaminant concentrations which appear to be <br /> localized and defined. You are required to conduct a feasibility study to determine the best <br /> available technology that will mitigate the impact to groundwater in the area of MW#5. Please <br /> submit the feasibility study by May 31, 2001. <br /> If you have any further questions regarding this matter, contact Harlin Knoll at (209)468-3442. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Harlin Knoll, Senior REHS Margaret - gorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> HK <br /> c: RWQCB, Central Valley Region-Marty Hartzell <br /> Ground Zero Analysis, Inc. <br /> A Division of San ioaquin County Health Care Services <br />