SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

ER CESPUBLIC1EALTH S .o� SAN JOAQUIN COUNTY _ ' 7. v ENVIRONMENTAL HEALTH DIVISION �' a Ernest M. Fujimoto, M.D.7 M.P.H.7 Acting Health Officer 4LIFpiR�` 445 N. San Joaquin Street • P.O.,Box 388 • Stockton, CA 9520I-0388 (209) 468-3420 MICHAEL MACMASTER SWIFT TRANSPORTATION CO., INC 781 SWIFT WAY STOCKTON CA 95206 19 1994 RE: Swift Transportation Co., Inc. Site Code: 1075 781 Swift Way Stockton, Ca 95206 San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) has reviewed the "Workplan Addendum" submitted by Wallace-Kuhl on September 28,1994 and has the following comments. Although placement of the proposed monitoring well (MW-4) in the western quadrant will aid in delineating the soil and groundwater plume, PHS-EHD is concerned that quadrants to the southwest and to the north have not yet been investigated. Groundwater gradient information submitted in this workplan confirms a generally northern gradient over the last fifteen months. Currently, there is no monitoring well down gradient and PHS-EHD recommends that if only one well were to be placed at this time, it should be placed north of the old tank pit. Current corrective action regulations require that sites collect and analyze data necessary to assess the nature and vertical and lateral extent of both the contaminated soil and groundwater and determine a cost-effective method of cleanup. (California Code of Regulations Title 23) section 2725). PHS-EHD recommends that a cost-efficient method now may be to place multiple wells that would also assess the areas south and west of the old tank pit. Whether a single well or multiple monitoring wells are to be placed during this proposed phase, PHS-EHD will require an updated site map showing the new well location(s). A Division of San Joaquin Count}' Health Care Service%