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Quarterly Monitoring Repot- <br /> January through March 1993 <br /> Smith's Canal Pump Plant <br /> Page 2 <br /> kriging program, depicts a northwesterly gradient of approximately 0.057 feet per foot <br /> (approximately 300 feet per mile). <br /> Petroleum product sheen was observed in well MW4. No product was recoverable during the <br /> reporting period. Since May 25, 1992, approximately 3.6 liters of free product have been <br /> removed from MW4. Table 2 summarizes the product thickness measurements and volume of <br /> product removed. All bailed product has been contained in a DOT approved double containment <br /> drum pending appropriate disposal. <br /> Groundwater samples were collected on March 31, 1993, from wells MW1, MW2, and MW3. <br /> No groundwater sample was collected from MW4 due to the presence of product sheen. Prior <br /> to sample collection, each sampled well was purged of a minimum of three well volumes of <br /> water to collect representative groundwater samples. Purged water was contained in labeled 55 <br /> gallon drums (DOT H), and stored on site. <br /> Groundwater samples were collected after physical parameters (pH, temperature, and <br /> G>f conductivity) were monitored and had stabilized. A dedicated disposable bailer with a bottom- <br /> emptying device was used to collect samples from wells MW1, MW2, and MW3. Field purge <br /> logs are presented in Attachment 1. <br /> LABORATORY ANALYSIS <br /> Samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX) and total petroleum <br /> hydrocarbons as diesel (TPHD) by state-certified RESNA Environmental Laboratories utilizing <br /> EPA methods 8020 and modified 8015, respectively. Analytical results are summarized in Table <br /> 3. Laboratory data sheets and chain-of-custody documentation are included in Attachment 2. <br /> Laboratory results indicate dissolved hydrocarbon constituents are not present at or above <br /> laboratory detection limits in wells MW1, MW2 and MW3. <br /> OTHER ACTIVITIES <br /> RESNA, on behalf of the City of Stockton, submitted a workplan for further subsurface <br /> investigation to PHSIEHD on April 6, 1993 entitled "Proposed Workplan, Phase II Assessment <br /> of Soil and Groundwater Contamination, Smiths Canal Pumping Plant". <br /> QRTERLYI l QMR 1993.FN L <br />