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Qwk Stop Station No 039 September 15 2000 <br /> Stockton California Ouarterl,� Groundwater Monitoring Report <br /> ether (MTBE) by Environmental Protection Agency (EPA) Method 8260B The monitoring <br /> well MW-I sample was also analyzed for total petroleum hydrocarbons as motor oil (TPHmo) <br /> • by EPA ]Method 8015M Laboratory results are summarized in Table I Copies of the <br /> laboratory data sheets and chain-of-custodN reports are included as Attachment C <br /> On 31 August 2000 Horizon transported the monitoring well purge water to 1nStrat Inc in <br /> Rio V ista, California for disposal A Non-Hazardous Material Profile Sheet was filled out and <br /> accompanied the shipment A payment receipt for acceptance of the purge water was received <br /> by Horizon A copy of the receipt is contained in Attachment D <br /> Results <br /> Groundwater level data collected by Horizon was used to construct a groundwater contour <br /> map (Figure 2) Depth-to-groundwater measurements were subtracted from the surveyed <br /> TOC elevations to calculate static groundwater elevations The average groundwater <br /> elevation for the site was approximately -23 9 feet mean sea level and represents an <br /> approximately 3 5-foot Fall compared to that measured in May 2000 The groundwater flow <br /> direction was generally to the southeast under a gradient of approximately 0 015 <br /> Concentrations of 60, 180 and 480 micrograms per liter (parts per billion or ppb) TPHg were <br /> reported in groundwater samples collected from monitoring wells MW-1, MW-2 and MW-3 <br /> respectively No BTEX or MTBE were reported in the three groundwater samples No motor <br /> oil was reported in the groundwater sample collected from monitoring well MW-1 <br /> • Report Distribution <br /> We recommend a copy of this report be forwarded to <br /> Mr Michael J Infurna <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> P O Box 2009 <br /> Stockton, California 95201 <br /> Mr Gordon Boggs <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> • 7% )gmr00Q3 doc <br /> 70 '1 i 1 2 HORIZON ENVIROL IENTAL INC <br />