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t„f; -; �Fw sy=' S �,'� '��.�? .y �� r ,�•�s �� w.,� '`I�-+`� ��t` �.p !YJy ,��."" �` ,wti."Y •c�,:,�'-'' ,r� a,5 �+_Y!Tti <br /> " ':L t � ',� ''�{' �`� �,`� a`�!mak° - y 'Sd ..� �ld'S " P. _� � t Fr4. � •�f�� ,}w <br /> tee• �` ry 'N- _ ,s y"�„ '�7r.'' � x• ^m. � ��i+�s.i�. `[ :ate � � sn" `YCv�'�Y .. <br /> W1: S'1 E.RN G1-- 01. 0 1C RN0L711C1_S , <br /> IIrrt 1:' i'R 1\(:Itii:o juII ;.!'�!!il1.til'I 11,I1 <br /> ti�\R 11 117.1:11.11(IR\I1'i4-ooI <br /> APR 7 1989 <br /> 13 April 1989 tid't +ai::;tl'r?,iI ('EA!ifl <br /> Lisa Marinaro PEt1'-r;,iN!,V HE; <br /> Chevron USA <br /> 2410 Camino Ramon <br /> San Ramon, California 94583 <br /> Re: Monitoring Well Installation <br /> Chevron SS #94275 <br /> Stockton, California <br /> WGR Jab #1-104.05 <br /> Rear Ms. Marinaro: - <br /> This letter report presents the results of soil boring and sampling, <br /> monitoring well installation and groundwater sampling conducted by Western <br /> Geologic Resources, Inc. (WGR) at Chevron service station #94275, located <br /> at 2905 W. Benjamin Holt Drive, Stockton, California (Figure 1). <br /> As requested the following scope of work was performed: <br /> ! 1) Drill five soil borings on the site. one immediately down <br /> gradient of the former location of the underground waste oil <br /> 4_ tank; three in the vicinity of the former location of the <br /> T underground storage tanks and pump islands; and one in the <br /> north west corner of the property and sample at about 5 ft <br /> intervals. <br /> 2) Complete the five borings as 4-inch-diameter monitoring wells; <br /> 3) Analyze selected soil samples for total purgeable petroleum <br /> hydrocarbons (TPPH) and aromatic hydrocarbons by EPA Method <br /> 524.2 and additionally analyze samples collected adjacent to <br /> the waste oil tank by EPA Method 524.2 for purgeable priority <br /> pollutants and by EPA Method 503E for oil and grease; <br /> 4) Develop and sample the T'nitoring wells and analyze the <br /> groundwater samples by EPA Method 524.2 for TPPH, aromatic <br /> hydrocarbons and purgeable priority pollutants and <br /> aaditi.onally analyze the sample from the well adjacent to the <br /> former location of the waste oil tank by.EPA Method 503E for <br /> oil and grease; <br /> 5) Survey the top-of-casing for the new monitoring wells and <br /> determine groundwater elevations in those wells; <br /> E) Perform a well canvass for 1/2 mile radius; and, <br /> 7) Review all field and laboratory data and prepare a report. <br /> r,; <br />