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WEi <br /> kt, F <br /> R E C E <br /> pr� <br /> F <br /> f <br /> ,.,.. <br /> l—J ' GRomDWATER ENVIRONMENTAL HEALTH <br /> �I <br /> TECHNOLOGY, <br /> AATT nn��'++ INC. RMIT/SERVICES <br /> 11i� 1`IOL�f�E , 1�11401 Halyard Drive,Suite M,West Sacramento,CA 95691,(916)3724700 <br /> PAN(916)37M781 <br /> r <br /> July 2, 1991 Project No.02320 0075 <br /> Mr.R. R.Zielinski <br /> Texaco Environmental Services <br /> 106 Cutting Boulevard <br /> Richmond,CA 94604 <br /> RE: QUARTERLY STATUS REPORT(R-3 of 91) <br /> TEXACO SERVICE STATION <br /> 440 WEST CHARTER WAY <br /> STOCKTON, CALIFORNIA <br /> Dear Mr.Zielinski: <br /> E <br /> This fetter Is presented as a quarterly report on groundwater conditions at the she referenced above for the <br /> quarter ending May 1991. Groundwater monitoring and sampling were conducted to determine water table <br /> elevation, the thickness of any separate-phase petroleum hydrocarbons (SP), and the distribution of <br /> dissolved hydrocarbons In the 11 mcnitciIng wells (MWs)at this site. Groundwater monitoring data and <br /> results of laboratory analyses of groundwater samples collected on February 8, 1991,are included. <br /> Also presented In this report are the results of a soil vapor extraction test that was performed at the site on <br /> May 22,1991, This test was conducted to determine if soil ven!!ng wild to a suitable method with which to <br /> remedlate subsurface soils Impacted with petrolaum hydrocarbons. <br /> WORK PERFORMED <br /> GROUNDWATER MONITORING <br /> Water tabi3 e!evations at the site have risen an average of 0.15 foot from leva!s reported the previous <br /> quarter. The estimated flow direction of the groundwater is divergent from fti *2 to the north,west and east. <br /> Monitoring results are presented In Figure 1 (Attachment A) and along with data from the four previous <br /> monitoring events Table 1 (Attachment B). <br /> GROUNDWATER SAMPLING <br /> Prior to water-sample collection,the groundwater monitoring wells were purged of 4-10 casing volumes and <br /> allowed to recharge vilth representative formation water. A U.S. Environmental Protection Agency(EPA)- <br /> approved Teflon' sampler, cleaned with an industrial detergent and dl.:01ed water, was used for the <br /> groundwater sampling. The water samples were then transferred to 40-miTiiter glass vials with Toflon% <br /> septum caps, preserved on Ice, and transported to GTEL Environmental Laboratories, Inc. (GTEL), In <br /> Concord, California,accompanied by a chain-of-custody manifest. <br /> Oltrres throughout tha U.S.,Canada and Oversea.0 <br />