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PUBLIC COPY <br /> UBLIC HEALTH SERVICES <br /> `.o <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 c"�IFORN ° <br /> 209/468-3420 <br /> PHILLIP ELDER/JAY QADDOURA JAN 0 2 2001 <br /> RAINWATER CARWASH <br /> 420 W YOSEMITE <br /> MANTECA CA 95337 <br /> RE: RAINWATER CARWASH SITE CODE: 231458 <br /> 420 W YOSEMITE AVE <br /> MANTECACA 95337 <br /> San Joaquin CounryPublic Health Services,Environmental Health Division(PHS-EHD)has reviewed the <br /> Fath Qwner 2000 QmmiyRepo t dated December 11,2000 prepared by Advanced GeoEnvironmental,Inc. <br /> (AGE). Five monitoring wells (MIXT were installed at the above referenced site in July 2000. <br /> Analytical Results of Ground Water Samples from MW-2 in micrograms per liter(µg/l)are as follows: <br /> TPH-g Benzene Toluene Ethyl- Xylenes MTBE <br /> benzene EPA 8260 <br /> 07-11-00 140,000 13,000 28,000 3,200 17,000 950,000 <br /> 10-31-00 140,000 18, 00 28,000 3,700 20,000 180,000 <br /> Analytical results of the MTBE concentration in the groundwater sample collected from MW.2 has decreased <br /> from 950,000µg/I in July to 180,000µg/l in October. However,there is no corresponding decrease in T PH-g <br /> or BTEX concentration in the groundwater samples over the same period. Also,there is no decrease in the <br /> MTBE concentration evidenced in the analytical results of MW-1 and MW-3. The concentration of temamyl <br /> Methyl ether(TAME)detected in the groundwater samples collected from MW-1 increased from 580 itg/I in <br /> July to 1,100µg/1 in October. The decrease in T=E concentration in the\IW-2 sample this quarter may be <br /> indicative of the mobility of the MTBE plume at this site. Given the predominantly sandy soil type geology at <br /> the site as evaluated by a series of cone penetrometer borings during December 2000,there is strong urgency in <br /> defining the vertical and lateral extent of the contamination in groundwater and effecting interim remediation <br /> measure to control plume migration. <br /> PHS/EHD concurs with AGE's recommendation to initiate remediation feasibility studies for corrective action <br /> and interim remediation action to inhibit migration of the MTBE plume. In a meeting with AGE staff on site <br /> on December 18,2000,AGE confirmed that a work plan for a groundwater extraction test will be submitted to <br /> PHS/EHD. PIIS/EHD recommends this workplan be submitted to this office as soon as possible. <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 �� n <br /> Jeffrey Wong,Sr.RENS M� <br /> LOP/Site Mitigation Unit IV Registered Geologist,Unit IV <br /> c: RWQCB,Central Valley Region-Marty Hartzell <br /> C: Advanced GeoEnvironmental,Inc.- Tun Cuellar <br /> A Division of San Joaquin County Health Care Services <br />