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,.-''= '' "�,kx �'-,. :�s� �.r-: €�,n_,- - -� �- �ss�- r`•��:?'b�e`-,-'•+i ��+9R"a:�.- - -r. -gam -gpG -_ <br /> � <br />,,j- °--YY �.� == '� �' :;_ .:=;.� Wiz., �:;� � •, �� ����y- -;�,- � � � :� :� � <br /> ,,kk���....� "66 ':ye�� �,.�-f'�+'i, � � m �4 ..�'� `��'uv�'s�:�.9'.. i, �>�• '.; '3d� �''"'�:a' l "..'. <br /> • - «,�� i x•' '�'.. -•.� ..:.�.... -"e �.y-?L, 7 .>r =.. � ;. ¢fir ij ^�tv.. _���. -'�2m.�'�fi4 .,.k ,H "*x `•c;.mow '� <br /> 0. <br /> ALTO <br /> GEOSCIENCE <br /> Ja THE RCOULT13TEAM -i -i t, •� TIR <br /> December 13, 1991 <br /> Mr. Clint Rogers <br /> Chevron U.S.A., Inc. <br /> Post Office Box 5004 <br /> San Ramon, California 94553-0804 310--308 <br /> Subject: Quarterly Ground Water Monitoring Report <br /> Chevron Station No. 9-4275 <br /> 2905 West Benjamin Holt Drive <br /> Stockton, California <br /> Dear Mr. Rogers: <br /> In accordance with our agreement, Alton Geoscience transmits <br /> this Quarterly Ground water Monitoring and Sampling Report for <br /> Chevron Station No. 9-4275, 2905 West Benjamin Holt Drive, <br /> Stockton, California. Figure 1 shows the site location. <br /> Monitoring and sampling of the ground water monitoring wells <br /> was performed on October 31, 1991, in accordance with the <br /> requirements and procedures of the California Regional Water <br /> Quality Control Board (RWQCB) and local regulatory agencies. <br /> 9 <br /> FIELD PROCEDURES <br /> : . Prior to purging and sampling the wells, each well was checked ; <br /> for liquid-phase hydrocarbons or sheen. The depth to ground <br /> water and, if present, free product was measured in each well <br /> from the top of casing using an electronic interface probe <br /> with 6.01 foot tolerance. <br /> Ground water samples were collected after more than 3 casing <br /> volumes of ground water was purged from each well. Each <br /> sample was collected using a clean bailer. Ground water <br /> samples were then decanted into the appropriate clean sample <br /> containers for delivery to a California-certified laboratory <br /> following proper preservation and chain of custody procedures. <br /> Purged ground water was stored onsite in DOT-approved, <br /> 55-gallon drums pending removal by Erickson Inc., a licensed <br /> hauler. The purged ground water was transported as <br /> non-hazardous to Gibson Oil/ Pilot Petroleum of Redwood City, <br /> California for recycling. <br /> MOD WWI Amt.Suitt 110 <br /> Concord,Caldoin a 91520 <br /> {115)6821582•FAX 1415)682.8921 <br />