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V F Y 1J <br /> z <br /> • <br /> InENVIRONMENTAL•CONSTRUCTION•MAINTENANCE <br /> IRWIN,INC. LONG BEACH•TEMECULA• MERCED•PHOENIX <br /> June 14, 1995 R59911YE <br /> Mr. Steve Sasson, Senior R.E.H.S. JUN 19 1995 <br /> Site Mitigation Unit ENVIRONMENTAL HEALTH <br /> San Joaquin County Public Health Services PERMIT/SERVICES <br /> Environmental Health Division <br /> Post Office Box 388 <br /> Stockton, California 95201-0388 <br /> SUBJECT: WORKPLAN ADDENDUM II FOR HYDROPUNCHES� AND TWO <br /> ADDITIONAL MONITORING WELLS <br /> Village West Marina, 6649 Embarcadero Drive, Stockton, CA <br /> Site Code 1098; W.W. Irwin, Inc. Project 33016.05 <br /> Dear Mr. Sasson, <br /> In accordance with the directives specified in your letter of February 10, 1995, W.W..Irwin, Inc. <br /> has been authorized by Mr. Dwight Davis of the Pegasus Group to provide you with this <br /> Workplan Addendum for the drilling and samplings of Hydropunches� followed by the <br /> completions of two additional monitoring wells. A tentative timeline to complete the proposed <br /> .. actions at the subject site is also attached. <br /> Findings of the Interim Investigation and Evaluation Report and Project Status Report of <br /> -- Ground-Water Monitoring (W.W. Irwin, Inc.; July 1994) and data obtained during monthly <br /> soundings and quarterly samplings of three on-site monitoring wells between August 1994 and <br /> January 1995 (see Project Status Report of Ground-Water Monitoring by W.W. Irwin, Inc., <br /> January 30, 1995) have provided the following information; ground-water in the vicinity of well <br /> MW-6, located north of the backfilled tank pit, is impacted with significant TPH-g and BTEX. <br /> The lateral extent of the contaminant plume is as yet undefined in that direction. An east- <br /> southeasterly ground-water flow direction has been calculated following the past seven sounding <br /> activities. And based on the calculated ground-water flow direction, the downgradient extent <br /> of the plume has also remained as yet undefined. Present and proposed monitoring well and <br /> Hydropunch' locations are depicted on the Site Sketch, Figure 2. The anticipated Well <br /> Construction Diagram is included as Figure 3. <br /> 4.. <br /> (209)725-2085•(800)585-2085• (209)383-3404 FAX <br /> 335 GROGAN AVENUE,SUITE A•MERCED,CALIFORNIA•95340 "PARTNERS IN SERVICE" <br />