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r <br /> uiN <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUN1Y r� s <br /> fOG3 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 /> CHUCK CARMEL <br /> ENVIRONMENTAL ENGINEER <br /> ARCO PRODUCTS COMPANY <br /> P o BOX 5811 fk '15112 3 1993 <br /> SAN MATEO CA 94402 <br /> RE: ARCO STATION # 434 SITE CODE: 1341 <br /> 501 Kettleman Lane <br /> Lodi, CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Second 1993 Quarterly Report" dated October 14, 1993, <br /> prepared by Brown and Caldwell for the above referenced site. The vapor <br /> extraction system appears to be effectively remediating the contamination at this <br /> site. <br /> I <br /> Monitoring well (MW) W-2 has not been sampled since October 1991 and it has been <br /> reported to be bio-fouled. PHS/EHD staff made an inspection on November 16, <br /> 1993, during sampling of the monitoring wells and was informed by EMCON's <br /> technician that the obstruction felt like metal. Since the Well Wizard dedicated <br /> pumps were removed from the monitoring wells some time after the October 1991 <br /> sampling, PHS/EHD wonders if the pump may be lodged in MW W-2. <br /> As noted in reportsjMW W-2A has insufficient water for well sampling, MW W-2B is <br /> completed in a deeper zone, and MW W-2 is obstructed. Therefore, there is no <br /> monitoring of the contamination in this area of the site. The last water sample <br /> results in October 1991 evidenced 440 ppb benzene and 4000 ppb TPH-g. If MW W-2 <br /> cannot be cleared for sampling it should be destroyed and another monitoring well <br /> should be installed to replace it. <br /> If MW W-2 cannot be cleared, a work plan for its destruction and replacement <br /> should be submitted to PHS/EHD by January 15, 1994. <br /> If you have any questions contact Margaret Lagorio, Senior RENS, at (209) 468-- <br /> 3449. <br /> Jogi Khanna, M.D. , M.P.H. <br /> alth Officer <br /> Donna Heran, RENS, Program Manager <br /> Environmental Health Division <br /> DH/ml <br /> C, Brown and Caldwell <br /> C- Central Valley Regional Water Quality Control Board <br /> A Division of San joaquie County Health Care Services 10 <br />