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640 & <br /> PUBLIC HEALTH SERVICES ,oPq�IN <br /> o� <br /> SAN JOAQUIN COUNTY 2` z <br /> JOGI KHANNA M.D..M.P H. <br /> Health Officer <br /> 6-0 <br /> N:r <br /> P.O. Box 2009 � (1601 East Hazelton Avenue) 0 Stockton, California 95201 it <br /> (209) 468-3400 <br /> THEODORE I WITTMAYER ESQ COFT <br /> STONE BROTHERS AND ASSOCIATES <br /> 1024 W ROBINHOOD DR NOV i 9199% <br /> STOCKTON CA 95207 <br /> RE: Montgomery Ward SITE CODE: 2163 <br /> 5400 Pacific Ave. <br /> Stockton, CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has reviewed the "Work plan for Phase V <br /> Subsurface Investigation" and has the following comments. <br /> PHS/EHD does not concur with the conclusion that the total <br /> petroleum hydrocarbons (TPH) detected at 30 feet below <br /> groundsurface (bgs) in boring 9 are not from a gasoline or diesel <br /> source. The LUFT manual states that gasoline components range <br /> from carbon chain lengths of C-4 to C-12. Chromatographs <br /> submitted in the "Phase IV Subsurface Investigation Report" , by <br /> Environmental Audit, Inc. dated August 20, 1992 , identify C-8 to <br /> C-9 carbon chain lengths with concentrations in the soil sample <br /> from B-9 at 30 feet bgs, to be 4200 ppm. <br /> In correspondence from PHS/EHD dated June 11, 1991, Montgomery <br /> Ward was directed to determine if groundwater beneath the former <br /> gasoline tank location was impacted by petroleum hydrocarbons. <br /> High levels of hydrocarbon contamination exist at a depth of 50 <br /> feet bgs. The seasonal high groundwater level for this site <br /> according to the "San Joaquin County Flood Control Map Spring <br /> 1986" is 35 feet. Therefore soil contamination exists below <br /> seasonal high groundwater and a groundwater investigation is <br /> warranted. <br /> In deciding placement of monitoring wells for this site the <br /> product line area should be included. Further investigation of <br /> the extent of soil contamination as well as investigation of the <br /> groundwater beneath this area is needed. An addendum to the <br /> Phase V work plan that addresses a groundwater investigation is <br /> to be submitted to PHS/EHD within 45 days of the date of this <br /> letter. <br /> Piping left in place in the dispenser island area is improperly <br /> abandoned. Proposals to properly abandon all piping shall be <br /> included in the addended Phase V work plan. <br /> A Division of San Joaquin County Health Care Sevices 0 <br />