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. i <br /> ENVIRONMENTAL HEALT <br /> IIEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> o.. <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Bor man,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor Borg <br /> man, <br /> -Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California95202-2708 <br /> Douglas W.Wilson,R.E.H.S. <br /> Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H S. <br /> 0.RCi _ <br /> Laurie A.Cotulia,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> BOB YAMADA MAR .0 5 2002 j <br /> 15406 S TRACY BLVD <br /> STOCKTON CA 95206 <br /> .RE: YAMADA BROTHERS SITE CODE: 4067 { <br /> 95406 S TRACY BLVD kk <br /> STOCKTON CA 95206 4 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Additional Site <br /> Assessment 14,eport dated December 12, 2001 prepared by Advanced GeoEnvironmental, Inc. <br /> (AGE). Analytical results of the grab ground water samples collected from soil borings P-2, <br /> 3, and 4 in October 2001 were non-detect for methyl tert-butyl ether(MTBE), and from P- <br /> 1 were 2.7 micrograms per liter (µg/L) of MTBE. Analytical results of the groundwater <br /> sample from Monitoring Well #3 (NfW-3)were 180 µg/L and from MW-2 were 35µg/L of <br /> MTBE. Analytical results of the groundwater sample collected from domestic well were } <br /> non-detect for MTBE. <br /> The concentration of MTBE in MW-3 has continued to rise since March 2001,and the <br /> lateral extent of the MTBE groundwater plume remains undefined to the west of MW-2 and <br /> north of MW-3. Submit a work plan that will define the lateral extent of the contamination <br /> plume to EHD by April 30, 2002. EHD also recommends using Appendix B of the Tri- <br /> Regional Board Staff Recommendations to determine that all data for site closure has been <br /> obtained and compiled as necessary. s <br /> If you have any questions, please feel free to contact Jeffrey Wong at(209) 468-0335. <br /> Donna Heran, REHS,Director <br /> Environmental Health Department <br /> Jeffrey Wong , Senior REHS Margaret agotio,REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region—Marty Hartzell <br /> c: Advanced GeoEnvironmental-Paul Dotsun <br /> l <br />