Laserfiche WebLink
RAMAGE <br /> ENVIRONMENTAL - Sacramento Office <br /> 14670 Cantova Way, Suite 200 <br /> 1: 23 Rancho Murieta, CA 95683 <br /> P�� <br /> Tel (916) 354-3250 <br /> Fax (916) 354-3251 <br /> August 5, 1998 <br /> Ms. Lori Duncan, R.E.H.S. <br /> San Joaquin County PHS/EHD <br /> 304 East Weber Avenue, Third Floor <br /> Post Office Box 388 <br /> Stockton, CA 95201-0388 <br /> Re: San Joaquin County Agricultural Commissioner's Office <br /> 503 East 10" Street, Tracy, California <br /> PHS/EHD Site Code: 1793 <br /> Dear Ms. Duncan: <br /> It was a pleasure to speak with you this week regarding your July 17, 1998 letter to Mr. Craig <br /> Ogata, Director of the San Joaquin County Facilities Management Department. Mr. Ogata <br /> has agreed to proceed with the course of environmental corrective action recommended by <br /> the San Joaquin County Public Health Services Environmental Health Division (PHS/EHD). <br /> To comply with your requests,three in-plume groundwater monitoring wells will be installed <br /> around the former UST excavation in the locations specified by PHS/EHD. As we discussed, <br /> these three wells will provide neither plume boundary delineation nor source area <br /> characterization(i.e., free product confirmation, measurement or removal). As requested, the <br /> three wells will be constructed with screen intervals extending from 5 to 20 feet below <br /> ground surface. The three wells will be developed, surveyed and sampled for laboratory <br /> analysis of diesel and gasoline hydrocarbons, as specified in Ramage Environmental's Work <br /> Plan, Monitoring Well Installation and Quarterly Groundwater Monitoring, dated July 1, <br /> 1998. <br /> The feasibility of source area excavation and direct injection of magnesium dioxide and/or <br /> hydrocarbon degrading microbes will be evaluated as possible remedial options at the site. <br /> The initial set of groundwater samples collected from the newly-installed wells will be tested <br /> for heterotrophic and selective microbial enumeration, general physiochemistry and <br /> dissolved oxygen to establish baseline conditions and to determine if current subsurface <br /> conditions would accommodate microbial growth and reproduction for contaminant <br /> biodegradation. Based on the results of this groundwater testing, a direct injection pilot study <br /> will be proposed for PHS/EHD review and approval. <br /> Finally, as requested, a water well survey will be performed to identify and evaluate any <br /> wells located within a 2,000-foot radius of the project site. <br />