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- 4 <br /> 4� <br /> i <br /> R E C E i -� . ' <br /> � J U L 191^11 <br /> J <br /> � GROUNDWATER ENVIRONMENTAL HEALTH <br /> INC. ERMIT/SERVICES <br /> ' TECHNOLOGY, <br /> .LE�I11Naf}ardl)rice.Snits]ill,tl'csl5scnmcnln.CA'J5ti91.191til:fiS-17ikt <br /> FAX 19IGI:7!-Si BE <br /> July 2 1991 Project No.02320 0075 <br /> Mr. R. R. Zielinski <br /> Texaco Environmental Services <br /> 108 Cutting Boulevard <br /> Richmond, CA 94804 <br /> RE: QUARTERLY STATUS REPORT 18-3 of 91) <br /> TEXACO SERVICE STATION <br /> 440 WEST CHARTER WAY <br /> STOCKTON, CALIFORNIA <br /> Dear Mr.Zielinski: <br /> This letter Is presented as a quarterly report on groundwater conditions at the site referenced above for the <br /> quarter ending May 1991. Groundwater monitoring and sampling were conducted ev determine water table <br /> elevation, the thickness of any separate-phase petroleum hydrocarbons (SP), and the distribution of <br /> dissolved hydrocarbons in the 11 monitoring wells (fAWs) at this site. Groundv+ator 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 venting will be a suitaNe method with which to <br /> remediate subsurface soils impacted with petroleum hydrocarbons. <br /> WORK PERFORMED <br /> GROUNDWATER MONITORING <br /> Water table elevations at the site have risen an average of 0,15 foot from levels reported the previous <br /> gLarter. The estimated flow direction of the groundwater is divergent from MW-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 Taole 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 with representative formation water, A U.S.Environmental Protection Agency(EPA)- <br /> approved Teflon" sampler, clroaned with an Industrial detergent and distilled water, was used for the <br /> groundwater sampling. The water samples were then transferred to 40-mlillilter glass vials with Teflon'- <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 /> Offb:s rhnxtvhntd the VS,611"ddd drd Orer WS <br />