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j <br /> Dave Camille Page 2 <br /> three of which were converted to monitoring wells, MW6 - MW8. Soil contamination was detected <br /> during the installation of VWl, VW2, VW3, VW4 and MW7. The total depth of the vapor extraction <br /> wells were approximately 50 feet with the screened interval approximately between 25 - 50 feet. The <br /> total depth of the monitoring wells were approximately 70 feet with the screened interval between 50 - <br /> 70 feet. Groundwater contamination has been detected in MW6, MW7, and MWB. <br /> In order to determine the extent of the groundwater contamination plume five additional monitoring <br /> wells were installed, MW9 - MW13, and one pumping well, PTWl. Field work commenced on August <br /> 19, 1992. No soil or groundwater contamination was detected during the installation of the monitoring <br /> wells; however, groundwater contamination has been detected in PTW1. <br /> Remediation <br /> The Problem Assessment Report proposed vapor extraction to remediate soil and possibly groundwater <br /> contamination. PHS/EHD agrees that vapor extraction is an effective method of remediation. <br /> Considerable design evaluation will be necessary in order to achieve the necessary zones of influence. <br /> Soil contamination is located vertically from 4 feet to 50 feet and horizontally the maximum width is <br /> 130. Groundwater extraction is not considered feasible at this time; however once soil remediation has <br /> progressed to the point that soil is no longer a source of contamination to groundwater, groundwater <br /> extraction and treatment will be considered. <br /> Please submit a draft final remediation plan (FRP) by April 30, 1992 Following receipt of the FRP a <br /> public participation period will commence. Also include in the FRP the results of the vapor extraction <br /> test which was performed on the site. Please contact the San Joaquin Valley Unified Air Pollution <br /> Control District to obtain a permit to construct. <br /> Quarterly sampling should continue, with quarterly reports submitted within 45 days of the date of <br /> sampling. The next quarterly report should be submitted by February 26, 1993. Please continue to <br /> provide 48 hours notice prior to any site work including sampling. <br /> If you have any questions or comments, please contact Mary Meays, REHS, of my staff at <br /> (209) 468-0337. <br /> Jogi Khanna, M.D. M.P.H. <br /> Health Officer <br /> La a A. Comilla, REHS, Program Manager <br /> virontnental Health Division <br /> LAC/MM:lb <br /> c: Elizabeth Thayer, CVRWQCB c: Eric Holm, RESNA <br /> c: Dayton Hudson Corp c: Dave Vossler, GeoStrategies <br />