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<br /> GROUNDWATER
<br /> i.- TECHNOLOGY, INC. pilII119rd[)rive.Suite 140.Wv,4SairamenlnXA9:i0l.191G1:t7247(11)
<br /> FAX 191fi1J72.Si61
<br /> January 8,1991 Project No.202/1504150
<br /> Mr. R.W.Conlon
<br /> Texaco Environmental Services
<br /> 10 Universal City Plaza
<br /> Universal City,CA 91602-1097
<br /> RE: QUARTERLY STATUS,REPORT NO. 4
<br /> TEXACO SERVICE STATION
<br /> 440 WEST CHARTER WAY
<br /> STOCKTON,CALIFORNIA
<br /> A
<br /> Dear Mr.Conlon:
<br /> This letter Is presented as a quarterly report on groundwater conditions at the site referenced above for the
<br /> quarter ending November 1 M. Groundwater monitoring and sampling were conducted to determine water
<br /> table elevation,the thickness of any separate-phase petroleum hydrocarbons(SP),and the distribution of
<br /> dissolved hydrocarbons In tF--e 11 monitoring wells ('.IWs) at this site. Groundwater monitoring data and
<br /> results of laboratory analyses of groundwater samples collected on November 9, 199o,are included.
<br /> WORK PERFORMED
<br /> GROUNDWATER MONITORING
<br /> Water table elevations at the site have decreased an average of 1.56 foot from levels reported the previous
<br /> quarter. The estimatcd flow direction of the groundwater ins divergent from MW-2 to the north,west and east.
<br /> Monitoring results are presented in Figure t and Table 1.
<br /> GROUNDWATER SAMPLING
<br /> Prior to water-sample collection,the groundwater monitoring wells were purged of 4-10 well volumes and
<br /> allowed to recharge with representative formation water. A U.S. Environmental Protection Agency(EPA)
<br /> approved Teflon" sampler, cleaned with an industrial detergent and distilled water, was used for the
<br /> groundwater sampling. The water samples were then transferred to 40-milliliter glass vials with Teflon-lined
<br /> caps, preserved on Ice, and transported to GTEL Environmental Laboratories, Inc. (GTEL), In Concord,
<br /> California,accompanied by a Chain-of-Custody manife,a.
<br /> offices lhwuyhuullhe US.,Canada and Oraseas
<br />
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