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F LEARW).UErkl <br /> G- R O U P, h - N C . <br /> Environmental Services i <br /> Mrs. Stella Ruiz September 29, 1999 <br /> 4491 West Durham Ferry Road'' <br /> Tracy,CA 95376 _ <br /> tivF.Li <br /> MEC <br /> r Re: Ruiz Grocery,4491 West Durham Ferry Road,Tracy,CA <br /> j <br /> i <br /> OCT 0 4. 19.99 <br /> Dear Mrs. Ruiz, � <br /> ENN.j4RON`sUiENTAt_ 10EST4� <br /> s taw9 l'SESMe <br /> y Enclosed please find a copy of Clearwater Group,Int.'s(CIearwater's) Groundwater a e a tatx ystem Operation <br /> Monitoring Report- Third Quarter 1999 for your site. Copies of the report have been,distributed to the agencies listed <br /> below. <br /> i As you are aware from earlier correspondence by the San Joaquin County Public Health'Services/Environmental.Health <br /> Division(SJCPHS/EHD)dated September 20, 1999,Clearwater and the regulatory agency are in agreement to terminate <br /> - operation of the existing remediation system. This is based on the ongoing results of nearly a year of system operation' <br /> that indicate substantial recovery of gasoline from the subsurface (7,377 lbs) and coincident reduction in groundwater <br /> contaminant levels. Very little gasoline recovery has occurred over the last three months'indicating the system has reached <br /> its effective limit. The equipment will remain shut-down until I can schedule pick-up from the vendor, which will likely <br /> happen within the next couple of weeks. <br /> The groundwater quality will continue to be monitored for several quarters to evaluate longer term trends in contaminant <br /> levels following remediation. Decisions regarding the need for additional remedial,will be made based on those results. <br /> As mentioned in the SJCPHS/EHD letter,additional borings will be needed at some point to verify soil clean-up. <br /> If you have any questions about the project or scheduling,please feel free to call either myself or Mr. Henry.Hurkmans at <br /> (510) 893-5160. <br /> Sincerely, <br /> Clearwater Group, Inc. <br /> Brian Gwinn, R.G. <br /> Senior Geologist <br /> enclosure <br /> h cc: Ms. Lori Duncan, SJCPHS/EHD <br /> Ms.Elizabeth Thayer,CVRWQCB <br /> i <br /> i . <br /> 520 Third Street,Suite 104 • Oakland,California 94607 • Telephone 510-893-5160 • Fax,510-893-5947 <br />