Laserfiche WebLink
PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY ? :� <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 304 E.Weber Ave., 3rd Floor P. O. Box 388 • Stockton, CA 95201-0388 <br /> 209/468-3420 <br /> I <br /> JEANNE HOMSEY <br /> SMITH ENVIRONMENTAL <br /> 1710 E MAIN STREET <br /> ESCALON CA 95320 MAILED 9UG 1 81995 <br /> RE: Ekholm Property SITE CODE: 1955 ' <br /> 1702 Jackson Street <br /> I" Escalon, Ca <br /> San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) has completed <br /> the review of the Clearwater Group letter response to the June 14, 1995 letter from this office. The <br /> following comments are provided for your consideration. <br /> In a letter to Margaret Ekholm dated September 28, 1994 (copy enclosed), PHSIEHD requested the <br /> E <br /> original vapor extraction wells be utilized in the remediation efforts at the site until the data generated <br /> from them warrants otherwise. According to Clearwater, the system at the site was only designed for <br /> the two additional wells that were installed by Clearwater. This action was counter to regulatory <br /> directive and has resulted in a great deal of time being spent to try to remediate the problem. This <br /> i problem has yet to be resolved. <br /> i <br /> The original vapor wells at the site were added to the system only after a directive to do so was issued <br /> by this office. However, the design of the system at the site cannot accommodate these wells. This <br /> impediment, in addition to the poor configuration of the piping connecting there to the system, renders <br /> i these wells almost useless for both monitoring and remediation efforts. <br /> The initial system utilized in-line vacuum gauges and flow meters. However, the original flow meters <br />� <br /> were e not appropriate and were installed incorrectly, basically useless. These were never replaced. <br /> Currently, air flow is being monitored by a portable field meter for which a fee is charged every visit. <br /> This meter would not be necessary if the original flow meters were appropriate for the site and were <br /> a <br /> correctly installed on the system. In addition, if the vacuum gauges currently not being monitored were <br /> in functional units for this site, they could have been used in another area of the system. This would <br /> negate the extra charge every visit to portably monitor for this parameter. Only the most cost effective <br /> approach to monitoring the system should have been implemented at the site. <br /> Communication between the State Water Resources Control Board Cleanup Fund and PHSIEHD staff <br /> on the status of the remediation efforts at this site has resulted in the suspension of payment until <br /> such time that the problems with the remediation system at the site are successfully resolved. <br /> Therefore, to attempt to mitigate this situation, please submit a more efficient design for a remediation <br /> i. system at this site. The piping diameter and configuration, and the size of the vacuum pump should <br />` be chosen to accommodate all the wells at the site. A redesign of the system can also be made using <br /> the current vacuum pump but changing the size and configuration of the piping. Based on these other <br /> design options, please demonstrate the difference in efficiency between them, using friction loss <br /> calculations. <br /> A Division of Sun Joaquin County Health Care Services <br />