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PUBLICHEALTH 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 95202 - - 'F6"� <br /> 209/468-3420 <br /> DANIEL SILVA <br /> WEST CLAY PROPERTIES AUG 0 1200-1 <br /> PO BOX 6152 <br /> STOCKTON CA 95206 <br /> RE: West Clay Properties Site Code: 1065 <br /> 639 West Clay Street <br /> Stockton, CA 95206 — <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has received and reviewed Quarterly Report— First Quarter 2001 dated April 10, 2001 <br /> prepared by Advanced Geo-Environmental, Inc. (AGE). Analytical results of the <br /> groundwater samples from monitoring wells (MM and soil samples from previous <br /> exploratory borings are as follows: <br /> Table 1:Groundwater analytical results of MW-1, (east of old tank area),MW-2(deepest well at the old tank <br /> area),and MW-3 (west). <br /> Date TPH- TPH-d MTBE B T E X <br /> MW-1 03/13/01 820 90 140 140 18 39 29 <br /> MW-2 03/13/01 8,300 1,000 Q.5 970 440 270 270 <br /> MW-3 12/18/00 63 60 Q 3.1 6.9 1.1 6.1 <br /> Results are in microgram per liter(pg/1) <br /> TPH g =total petroleum hydrocarbons as gasoline TPH d =total petroleum hydrocarbons as diesel <br /> B =benzene T =toluene E =ethylbenzene X =xylenes MTBE =methyl tett butyl ether <br /> Table 2: alyTical results of soil samples borin s B1 and B12 southeast of old tank area . <br /> Depth TPH- TPH-d MTBE B T E X <br /> B-1 41.5 21 <5 -- 0.42 0.10 0.25 1.1 <br /> B-12 55 Q Q <.5 0.068 0.026 0.13 0.19 <br /> Results are in milligram per kilogram(mg/kg) <br /> The depth is in units of feet below surface grade (bsg) <br /> Table 3: Groundwater analytical results of MW-9 (deepest well in new tank area),MW-11 (east),MW-12 <br /> (north),MW-13 (west),and EVIL 1 extraction well at the former dispenser) <br /> Date TPH TPH-d MTBE B T E X <br /> MW-9 03/13/01 60 <0 140 m.56 <0.5 m.5 <0.5 <br /> MW-11A 03/13/01 120 110 Q m.5 0.89 <.5 <.5 <br /> MW-12B 12/18/00 72 180 5.5 4.4 6.4 2.3 8.6 <br /> MW-13A 03/13/01 60 59 50 <.5 <.5 m.5 <0.5 <br /> E W-1 03/13/01 39,000 4,300 300 970 7,000 1,300 5,300 <br /> Results are in microgram per liter(pg/1) <br /> A Division of San Joaquin County Health Care Services <br />