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,�.CV <br /> LEARWATE <br /> G R O U P, <br /> Environmenfai Services <br /> Mrs.Stella Ruiz APR 0 9 April 5, 1999 <br /> 4491 West Durham Ferry Road { <br /> Tracy,CA 95376 <br /> Re: Ruiz Grocery,4491 West Durham Ferry Road,Tracy,CA <br /> Dear Mrs. Ruiz, <br /> Enclosed please find a copy of Clearwater Group, Inc.'s (Clearwater's) Groundwater and Remediation System <br /> Operation Monitoring Report-First Quarter 1999 for your site. Copies of the report have been distributed to the <br /> agencies listed below. <br /> Results of recent groundwater monitoring indicate that the SVEIAS system has had a significant effect on <br /> dissolved-phase contaminant concentrations beneath the site. Dissolved-phase contaminant concentrations are <br /> down approximately one magnitude over previous results. A continued decline in these concentrations is <br /> expected with the ongoing operation of the SVFJAS system throughout the summer. The most important wells to <br /> monitor for the effect of site clean-up, in addition to the domestic well, are plume wells MW-1 and MW-2. <br /> Perimeter wells have been essentially free of contamination since installation and quarterly monitoring of these <br /> wells is not warranted. Therefore,Clearwater intends to continue groundwater monitoring in accordance with the <br /> following schedule,as proposed earlier in Clearwater's Groundwater and System Operation Monitoring Report- <br /> Fourth Quarter 1998 dated January 27, 1999: <br /> Well I.D. Quarterly Annually <br /> (1st, 2nd, 3rd. 4th uarters) (1st uarter) <br /> MW-1 DTW.TPH ,BTEX,MTBE <br /> MW-2 DTW,TPH ,BTEX.MTBE <br /> MW-3 DIW TPH ,BTEX,MTBE <br /> MW-4 DTW TPH ,BTEX.MTBE <br /> MW_5 DTW TPH ,BTEX,MTBE <br /> MW-6 DTW TPH ,BTEX,MTBE <br /> MW-7 DTW TPH ,BTEX,MTBE <br /> Domestic Well TPHiz,BTEX,MTBE <br /> Nolte: <br /> DTW=depth to water <br /> TPHg,BTEX,MTBE=by EPA Method 8015/8020(modified) <br /> The SVE/AS system is operating as designed, recovering gasoline hydrocarbons from the area of soil <br /> contamination at significant rates. An estimated 6,287 lbs (1,031 gal) of gasoline hydrocarbons have been <br /> recovered from the subsurface since remediation was initiated in October 1999. Clearwater recommends <br /> continued operation of the remediation system as it is currently configured until contaminant recovery rates fall <br /> off appreciably. <br /> Mrs. Stella 1r'I'hird Street,Suite 104 • Oakland,California 91607 • Telephone 510-893-5160 • Fax 510-893-5940ri1 5, 1999 <br />