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LEARWAE.R- <br /> t <br /> �.r5.. <br /> G R O U P, I Nr <br /> Environmental Services <br /> I <br /> r <br /> Mrs. Stella Ruiz July.21, 1999 f <br /> 4491 West Durham Ferry Road <br /> Tracy,CA 95376 <br /> Re: Ruiz Grocery,4491 West Durham Ferry Road,Tracy,CA <br /> i <br /> ` Dear Mrs.Ruiz, . <br /> t <br /> Enclosed please find a copy of Clearwater Group, Inc.'s (Clearwater's) Groundwater and Remediation System <br /> Operation Monitoring Report Second Quarter 1999 for your site. Copies of the report have been distributed to <br /> j <br /> the agencies listed below. i <br /> 1 The remediation system has been successful at removing gasoline contaminants from the subsurface and greatly <br /> reducing groundwater contamination. Results of recent water sampling indicate that groundwater contamination <br /> 5 is down by two orders of magnitude since remediation system start-up. Further,the system has recovered a total <br /> of 7,344 lbs (1,204 gal) of,gasoline hydrocarbons from the subsurface, However, recent system,monitoring <br /> results show that contaminant recovery rates have dropped off.appreciably since May 1999. This indicates that ; <br /> the system is nearing its effective limit at recovering contamination from the ground. If these trends continue <br /> over the next several months,system shut-down will be warranted. This timing may be appropriate, as costs for <br /> system operation are pre-approved through the end of September 1999 by the Underground Storage Tank Clean- <br /> up Fund. Following system shut-down,it is likely groundwater will be monitored for a limited period of time <br /> thereafter to verify site clean-up for regulatory closure. <br /> If you have any questions about the project or scheduling, please feel free to'call either myself or Mr. Henry <br /> Hurkmans at(5 10) 893-5160. <br /> 5 <br /> Sincerely, <br /> Clearwater Group, Inc. <br /> r - <br /> Brian Gwinn, R.G. <br /> Senior Geologist <br /> enclosure <br /> CC'. Ms. Lori Duncan, SJCPHS/EHD <br /> Ms. Elizabeth Thayer,CVRWQCB <br /> Telephone 510-893-5160 <br /> Mrs. Steua Bd�Third Street,Suite 104 + Oakland,California 94607 + + Fax 510 893-5947a1y 21, 1999 <br />