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PUBLIC-HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DMSION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 9520 D <br /> 209/468-3420 <br /> TINA MAYHEW MAY 11 1998 <br /> WEST CLAY PROPERTIES <br /> PO BOX 6152 <br /> STOCKTON CA 95206 <br /> RE: West Clay Properties Site Code: 1065 <br /> 639 West Clay Street <br /> Stockton, California <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed "Monitoring Well Installation Work Plan" dated 31 March 1998 prepared by Advanced <br /> Geo Environmental, Inc. The work plan is approved with the following conditions: <br /> 1) Soil borings for the two dual-complete monitoring wells will be advanced using a 12-inch <br /> diameter hollow-stem auger instead of the proposed 10-inch diameter hollow-stem auger. <br /> 2) Selection of soil samples for analyses must include PHS/EHD comment and concurrence. <br /> 3) A well permit application and $89 permit fee must be submitted and the permit issued before <br /> commencement of work. The previous permit expired on 29 April 1998. <br /> PHS/EHD has also reviewed "Quarterly Monitoring Report - February 1998" dated 29 April 1998 <br /> prepared by Advanced GeoEnviron mental, Inc. <br /> The direction of the ground water gradient has changed 156 degrees, swinging from N 200 E in <br /> November 1997 to S 140 E in February 1998. Since May 1997, it has changed 173 degrees. With <br /> the exception of the monitoring event in March 1995 when it was at S 75°W, the direction of the <br /> ground water flow had been consistently north-northwestward. Such drastic changes in the <br /> direction of ground water flow may influence the contamination plume and decisions on <br /> remediation in the future. PHS/EHD recommends a well survey be performed locating domestic, <br /> municipal, agricultural, industrial and other wells within 2000 feet of the site. A rose-gradient <br /> diagram should be prepared and be included in future quarterly monitoring report. <br /> If you have any questions, please feel free to contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Jeffrey Wong , EHS, Trainee Margaret 9ono, REH <br /> LOP/Site Mitigation Unit IV Supervisor <br /> JW:Ib <br /> c: RWQCB, Central Valley Region - Pat Anderson <br /> c: Advanced GeoEnvironmental, Inc. - Kevin McKibben <br /> A Division of San Joaquin County Health Care Services <br />