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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY r ? <br /> N: <br /> JOG[ hHANNA i`LD. . AI' ll Dow � I <br /> Health Officer c <br /> r . <br /> P.O. Box 2009 • ( 1601 East Hazelton Avenue) • Stockton, California 95201 <br /> (209) 468-3400 <br /> SEP 2 3 1991 <br /> CHARLES CARMEL cc 77\1 <br /> ARCO PRODUCTS COMPANY <br /> P O BOX 5811 <br /> SAN MATEO CA 94402 <br /> RE: Arco Service Station #548 IN REPLY REFER TO SITE CODE: 1127 <br /> 1612 Hammer Lane <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) staff has reviewed <br /> the work plan for subsurface environmental investigation at the above referenced site and has the following <br /> comments: <br /> 1 . The depth and frequency of sample collection/analysis for each boring location need to <br /> follow the Luh Manual and Tri-Regional Guidelines. The soil boring data collected is not <br /> meant to indicate maximum concentrations of contaminants only. Analytical data collected <br /> should be used to help define dimensions of the plume and possible threat to groundwater. <br /> Since often times field screening methods do not correlate well with analytical results,it is <br /> recommended that more than one sample per hole be analyzed. <br /> 2. Both soil and groundwater samples should be analyzed for the recommended minimum <br /> verification analyses outlined in Table #2 of the Tri-Regional Board Staff Recommendations. <br /> 3. In the description of the monitoring well construction, no mention is made of the length <br /> of the screened interval. The Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) staff have strongly recommended a maximum of 20 feet. Also, related to the <br /> monitoring well construction, PHS/EHD is recommending surge blocking the well prior to <br /> the placement of the bentonite plug. Experience has shown that many times the filter pack <br /> will settle substantially and if surging is done at this time, a void beneath the bentonite <br /> plug can be prevented. <br /> Please contact Steven Schneider, REHS, of my staff at (209) 468-3441 with your response to these comments <br /> so that your permit to drill can be issued. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health OIf " <br /> i <br /> urie A. HS, Program Manager <br /> Environmental Health Division <br /> C/SS:nr <br /> c : CVRWQCB - Elizabeth Thayer <br /> c: Resna <br /> 3164 Gold Camp Drive, Ste. 200 <br /> Rancho Cordova, CA 95670 <br /> A Division of San Joaquin County Health Care Services �� <br />