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PUB ht'C HEALTH SEit-VICES <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.M.P.H. <br /> Health Officer <br /> P.O. Box 2009 + (1601 East Hazelton Avenue) + Stockton, California 95201 <br /> (209) 468-3400 <br /> JOSEPH AMBROSE <br /> AMERICAN REAL ESTATE GROUP <br /> L <br /> r 3102 OAK LAWN, SUITE 900 JUL 3 01993 <br /> DALLAS, TEXAS 75219 v <br /> RE: 1235 E. Alpine SITE CODE: 1512 <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the <br /> Quarterly Monitoring/Soil Excavation Report dated May 14, 1993,submitted by Weston,and has the following <br /> comments. <br /> The March 1993 over-excavation activities removed a large portion of the petroleum impacted soil from the <br /> site. However,the confirmation soil sample results show low levels of petroleum hydrocarbons still remaining <br /> in the former tank pit area. In addition, the results of soil samples obtained from 50 feet below ground <br /> surface(BGS)during the construction of monitoring wells MW#1,MW#2 and MW#3 also indicate low levels <br /> of petroleum hydrocarbons in the soil. This residual soil contamination may continue to act as a source to <br /> the groundwater contaminant plume for some time. <br /> The groundwater sample results have shown significant petroleum hydrocarbon contamination since the first <br /> groundwater monitoring wells were installed in 1991. The high levels of benzene contamination in the <br /> groundwater and the close proximity of a municipal well to the site justify prompt remedial action. <br /> Therefore, several active remedial alternatives to abate the groundwater contamination at this site must be <br /> evaluated, and any needed feasibility studies must be completed, during the next two to three calendar <br /> quarters. Sufficient data must be gathered so that a final remedial pian can be developed and implemented <br /> at this site. A final remedial plan for this site is due to be submitted to PHS/EHD by April 25, 1994. <br /> If you have any questions concerning this letter please contact Linda Turkatte, Senior RENS, of my staff at <br /> (209) 468-3441. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health Officer <br /> Donna Heran, REHS, Program Manager <br /> Environmental Health Division <br /> DH/LT:Ib <br /> c: Beth Thayer-CVRWQCB <br /> c: Erich Beringer-AREG Stockton <br /> C: Paul Sundberg-Weston <br /> A Division of San Joaquin County Health tare Services <br />