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P <br /> n! <br /> SAN JOAQUIN COUNTY PUBLIC HEALTH SERVICES <br /> ENVIRONMENTAL HEALTH DIVISION <br /> SITE MITIGATION UNIT San Joaquin County <br /> 304 E.WEBER STREET Public <br /> STOCKTON CA 95201 Services <br /> RON ROWE <br /> SENIOR REHS Environmental <br /> PHONE#209 468-0342 Division <br /> FAX#209 468-3433 <br /> Fiax <br /> To: Russ Nelson, Dale Ramey, D.Anderson From: RON ROWE <br /> RP, City of Ripon,Wright Environmental PHS/EHD SITE MITIGATION UNIT <br /> Fax: 599-6376, 599-2685, 832-5152 Pages: 3 <br /> Phone- Date: Thursday,April 01, 1999 <br /> Re: 22700 S. HWY 99 CC: Mark List, CVRWQCB, (916)-255-30tS <br /> Cl Urgent ❑ For Review ❑ Please Comment ❑ Please Reply ❑ Please Recycle <br /> • Comments: <br /> As a follow up to several telephone discussions, recent meetings, and review of the March 15, 1999 <br /> Excavation and Soil Management Work Plan, San Joaquin County Public Health Services <br /> Environmental Health Division (PHSIEHD) provides the following comments. See attached signed <br /> workplan approval. <br /> Although not explicitly mentioned in the work plan the rationale for the proposed remediation effort <br /> considers the future development of this parcel. The groundwater plume has documented diesel <br /> contamination at 590,000 ugll with a nearby municipal drinking water supply well 600' SouthWest of the <br /> parcel. The new municipal supply well, not in operation as of this date, may create significant changes <br /> in near-field and far-field groundwater flow when in use, which could create a drinking water quality <br /> problem for the purveyor given the close proximity of this well to the contaminant source. PHSIEHD <br /> has discussed this site with Mark List of the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB). Mr. List and PHSIEHD recognize that groundwater plume migration at this time is an <br /> unknown, and actual health risk also is an unknown as it relates to beneficial use groundwater. These <br /> unknown conditions are made more complex given the time frame for property development. The <br /> property will become a freeway interchange over the course of the next 6 months. Given this short time <br /> frame simply will not allow for a longer-term corrective action assessment. Large volumes of soil will be <br /> placed over this contaminant source approximately 30' above the existing grade. After that time an <br /> excavation of contaminants would no longer be feasible in the event of mobilized contaminant <br /> migration. Given the physical properties of the known contaminants excavation appears to be the most <br />