SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

Mr. Robert Troinmer Comments on CUF Site Closure Recommendations for Various Sites Page 2 of 7 March 3, 2010 requested very specific information regarding these issues in correspondence dated Set J 23, 2009, and the response report issued by,the consultant; dated November 70 2009,p ember directly address any :of f these issues. The EHD is preparing additional correspondence did not requesting the specific information required by the EHD to render a professional opinion, based on reliable data, on the potential vapor intrusion issue. this If these issues had been adequately;addressed in the November report, the.EHD believes site would be closed now {or nearly closed). The EHD believes this Site should be closed, but - vapor intrusion has been -identified at the State level as a potential health issue that must be addressed before dosing a site.- j.The EHD is attempting to exercise due diligence by acquiring defensible data that demonstrates that the Health risk posed by potential vapor intrusion from residual contamination is at or below an acceptable level. .lf the California State Water Resources Control Board Cleanup.. Fund _(CUF) technical.staff can provide the EHD with additional insight on these matters, it will be carefully considered. Claim"No.`8828 - 632 S. EI Dorado Street Stockton This site has been though. remediation by'soil vapor extraction (SVE) and groundwater F extraction (GWE). One monitoring event has been conducted since cessation of active remediation, but the extraction well was not sampled. ._Thea EHD has directed an.additional monitoring event to check for rebound. Anticipating favorable results, the EHD believes the site can reach final closure :in approximately six months (sampling event not yet performed or reported). Claim No. 889 - 5491_F_Street,_Banta A monitoring well has been installed :to'check for deep total petroleum hydrocarbons quantified as motor oil (TPHmo) encountered by cone penetrometer testing (CPT) sampling. The initial monitoring of the well did not detect TPHmo. The-EHD plans one more monitoring of the new well to verify that TPHmo is not an issue in this area of.high groundwater utilization. Anticipating favorable results, the EHD believes the.site can be closed in approximately six months. Claim No. 1978 - 106 Second Street; Ribon The contaminants are generally delineated -for.. this release, except toward the north as demonstrated by impacted CPT,grab groundwater samples collected from boring CPT3 near the center of Second'Street; therefore,,the plume is undefined toward the north. As a municipal well. was formerly located toward the. northeast.of the site, a work,plan to obtain additional grab groundwater samples north and :northeast of the site has been approved. to complete plume delineation. Monitoring well MW-3 used to-be the heavily impacted well, but the plume shifted to MW-2 between 2003 and 2005, and appears to be gradually declining in MW-2 since 2007. Without -knowing the pumping history of the-'former municipal well, the EHD is concerned that the change in plume stability may be related oto the change in the municipal well usage. Assuming favorable result from-the grab groundwater samples; the EHD anticipates closing'this site in six to nine months.(to allow time to perform the field work, prepare and:.review the report -of findings, and destroy monitoring wells). Claim No. 2612 - 110 N. Filbert Street, Stockton This site is in the closure process, and the notification paperworkfor the Central Valley Regional Water Quality Control Board ,(CVRWQCB) is in preparation. A large number of monitoring wells need to be destroyed. The EHD anticipates final site closure in three months. Comments on CUF Site Closure Recommendations 0310AOG' i�