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F <br /> WALLACE KUHL October 6 1999 <br /> • <br /> G ASSOCIATES INC. <br /> Mr. Steve Jerkins w w _ �' 1 , J I <br /> F _ Crystal Cream & Butter <br /> k "= 1013 D Street <br /> Sacramento, California 95814 <br /> Quarterly Status Report <br /> 404 WEST FREMONT STREET <br /> Stockton, California r1 <br /> WKA No. 1628.09 <br /> i <br /> c <br /> t As required by the San Joaquin County Public Health Services,we are submitting <br /> this quarterly status report for the subject property located at 404 West Fremont <br /> Street in Stockton, California(Plate 1). <br /> t Most recent groundwater elevation measurements of the seven on-site monitoring <br /> wells (MWI through MW7 and City of Stockton Well SMW2) were obtained on <br /> August 5, 1999. Based on this most recent groundwater elevation measurement, <br /> depth to groundwater ranges between approximately 13.76 and 15.79 feet below <br /> -- grade(Table 1). The flow direction beneath the site was calculated to be to the <br /> northeast with a variable gradient. Groundwater contours for Au st of 1999 are <br /> presented on Plate 2. <br /> Prior to sampling, the depth to groundwater was measured in each well using a <br /> t.Fe,ea:tntc.l Solinst electronic water level indicator. The depth to groundwater measurements <br /> were used to calculate the volume of water in each well. Once calculated, <br /> ER,tt,e<60< c,t;d,«y approximately three well volumes of water were purged from each well using a <br /> two-inch submersible pump until temperature,pH, and conductivity readings <br /> F`t ,:.,tt:u�ttt}: stabilized and/or the water cleared of sediment. The water samples were then <br /> collected through the sampling pump. Sample water pumped from the well was <br /> poured into appropriate sample containers provided by the laboratory. <br /> The samples were immediately placed in an ice-chest with ice and submitted under <br /> chain-of-custody to a California-certified laboratory for analysis of Total <br /> �i rtf.FIH� :CSCItt <br /> Petroleum Hydrocarbons (TPH) as gasoline using EPA test method 8015 <br /> modified,Benzene, Toluene, Ethylbenzene and Total Xylenes (BTEX) and Methyl- <br /> tertiary-Butyl Ether(MtBE)using EPA test method 8020/602. <br /> 3050'nJi,Lrw1 Bkd The submersible pump was cleaned with a solution of Liqui-nox and water prior to <br /> We,t S;2o,t[rtctttt, purging each well to minimize the potential for cross-contamination. In addition, <br /> the wells were sampled in order of increasing concentration based on previous <br /> c `a 'Sf'�i sampling results. All water removed during sampling and purging operations was <br /> ". <br /> 1;16.$"1434 placed in sealed and labeled 55-gallon drums and stored on site. <br /> x 416.11'1565 <br />