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California Regional Water Quality Control Board e <br /> =a <br /> Central Valley Region <br /> Robert Schneider Chair <br /> Winston H.Hickox ray Davis <br /> Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/--rwgcb5 <br /> Secreraryfor Sacramento Main Office E <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 DEC 18 2002 <br /> 16 December 2002 ENpERMMENT H <br /> SERVICES <br /> Ms. Nancy Volpi <br /> A Volpi & Sons <br /> P.O. Box 58 <br /> Holt, CA 95234 <br /> MONITORING, WELL INSTALLATION AND SAMPLING REPJR T, VOL PI FARM PR_OPER T Y, <br /> 14210 WEST STATE ROUTE FOUR, STOCKTON,SAN JOA QUIN COUNTY <br /> We have reviewed the Monitoring Well Installation and Sampling Report, Volpi Farm Property, 14210 <br /> West State Route Four, Stockton, San Joaquin County(Report), dated 5 November 2002 and prepared on <br /> your behalf by Advanced GeoEnvironmental Inc. (AGI). The Report describes the September 2002 <br /> installation, and sampling of shallow monitoring well MW-7. Soil was analyzed for total petroleum <br /> hydrocarbons (TPH) as gasoline (-g) and diesel (-d), fuel oxygenates including methyl tert-butyl ether <br /> (MtBE), and benzene-toluene-ethylbenzene-xylenes (BTEX),with no detections reported in soil. <br /> Groundwater was analyzed for the same constituents. The Report states that only MtBE was detected in <br /> groundwater at 1.6 µg/L, although the lab reports MtBE as non-detect at 5.0 gg/L for MW-7. The <br /> Report recommends that quarterly monitoring of all monitoring wells (MW-1 through MW-7)begin in <br /> December 2002, and that a closure report be prepared after three quarters of sampling, if contaminant <br /> levels do not change. <br /> Comments: <br /> 1. Our 2 July 2002 letter requested comments on the Draft Monitoring and Reporting Program (MRP)by <br /> 1 August 2002. We have not received comments so we finalized the MRP (attached). Note that the <br /> groundwater analyses detection limits required for the MRP were not met in the most recent sampling <br /> event for several constituents. Please work with the laboratory to meet the required method detection <br /> limits for groundwater analyses in future events. <br /> 2. The report recommends site closure after three quarters of monitoring if no change in contaminant <br /> levels are observed. Only one well(MW-7) was sampled in September 2002. Trends in groundwater <br /> contaminant concentrations in all seven monitoring well will need to be evaluated before site closure is <br /> requested. <br /> California Environmental Protection .Agency <br /> Recycled Paper <br />