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�5 Working To Restore Nature <br /> 3164 Gold Camp Drive,Suite 200 <br /> Rancho Cordova,CA 95670 <br /> Phone (916)852-6690 <br /> FAX (916) 852-6688 <br /> July 21, 1993 <br /> Mr James Escobar <br /> Department of Public Works <br /> 1465 South Lincoln Street <br /> Stockton, California 95206 <br /> Subject Fourth Addendum to Work Plan and Status of Subsurface Investigation at <br /> Fire Engine Company No 2, 110 West Sonora Street, Stockton, California <br /> Mr Escobar <br /> At the request of the City of Stockton, RESNA Industries (RESNA) is submitting this fourth <br /> addendum to our Work Plan No. 38009-1W, dated March 9, 1988 Additional proposed <br /> work includes drilling four soil borings, installing one offsite groundwater monitoring well, <br /> installing two onsite vapor-extraction wells and conducting a vapor-extraction test The <br /> purpose of the work is to further delineate the lateral extent of dissolved hydrocarbons in <br /> groundwater and to further evaluate the feasibility of using vapor extraction to remediate <br /> soil beneath the subject site (site location shown on Plate 1) <br /> THIRD AND FOURTH QUARTER 1992 WORK <br /> A description of the installation of vapor-extraction wells, pumping-test well, and a <br /> piezometer and analytical results of soil and groundwater samples from the borings and <br /> wells were included in our fourth quarter 1992 report (RESNA, December 8, 1992, Report <br /> No 38009-4). <br /> On September 28, 1992, a vapor-extraction test (VET) was conducted to evaluate the <br /> feasibility of removing hydrocarbons using vapor extraction Data collected during the initial <br /> VET indicated that vacuum response was unusually low and adequate subsurface flow <br /> through zones targeted for remediation could not be confirmed Consequently, RESNA <br /> recommended the installation of additional vapor-extraction wells and the performance of <br /> a second VET to further evaluate vapor-extraction feasibility The detailed results of the <br /> vapor-extraction test work performed in September 1992 and the results of additional vapor- <br /> extraction testing to be performed as proposed herein will be included in a pending <br /> Remedial Action Plan (RAP) <br /> 380049w <br />