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TK� <br /> 2 ZZ <br /> :AMMWIRNERIWM��M ti 2r. <br /> ADelta <br /> Envir,3nmenlill <br /> runpultant_%,Inc. <br /> 3300 Data D;ivlo.Su to i00 <br /> rancho CoTdoya.CA 9567', <br /> January 11, 1991 <br /> Ms.Diane 14111scil ntia Hcaith <br /> Department of EnvitOnme <br /> San Joaquin County <br /> Stockton,California 95201 <br /> Quarterly Ground Water Sampling Results <br /> Subject: <br /> r <br /> sio west Charter Way, <br /> Stockton,California <br /> Shell WIC No.204-7524-4305 <br /> Delta project No.40-98-586 <br /> Dear Ms-Hinson: Shell oil company to conduct an <br /> �m been authorized by ed a,611 West Charter <br /> mental Consultants, Inc,, I service station located to characteri'm the <br /> Delta Environ.. conditions at a Shell. Intend <br /> r;.vestigation of oil arid.ground water con The Investigation is 11c. This <br /> (Figures I and 2). water beneath and adjacent to the 5 <br /> '(Alay, Stockton, Californialm cor <br /> 'st,tuca,s in soil and ground v - ties perforincd at the site on <br /> distribution of FtTOlell Ls Hueter <br /> water saA;'nPllrLg actii It.,e Inc tnonitoring,Weils <br /> were coilected from <br /> letter report summarl:Vj the re5r1l samples <br /> �r 24 19W. QV.,irterly ground <br /> October <br /> identified in Figure 2. dratilic Grttdlen- <br /> Di <br /> Witter L—eVeIRVIh�Fl" ecred <br /> Figure 3 depicts <br /> cenJuly and p <br /> bn <br /> 5,were matle,jr.onthly bCtW rernentSMdtl <br /> .1d water 10`vel'llcasurer""t� period. Grouad water level ea - kplot ofthiGrot'. uLngthis i tion arecomped Table I <br /> the ground vlatcf cOr investigation dropping <br /> throughout the duration of this'lives I over the past Year <br /> monitoring wells throu 4)shows a c0"'Inuoui decline in water elevations <br /> hisloric.al.data(Figure <br /> by approximately 2 to 4 feet in the wells. <br /> %,t, i1ly and Ground Water 9111112 111 ed during each <br /> jeqiive_ANO-519 water S.Inl]lc.collected flom each well Was Per' of free-phase <br /> for a ground W'St I lists the depth <br /> A subjecfi'�z tioulys's mettiods descirked in Enclosure A. Table Figure 5 depicts <br /> N4V!-3,MW-41 and MW'7- <br /> ding to MW-2 *educt sampling eveitt.according I - .in monitoring <br /> measured in Monitoring ldifiOrl to I he,free pha�d P. , <br /> a ,,,tor,qg we% and <br /> petroleum Product product beriP41ti; tile site. it, addition observed i <br /> the inferred extent C 1_1 a light sheen wK <br /> is N4W-2,MW-3,MW w,and MV <br /> Wei cr 1990. These sheens were rot Observed In subsequent monitoring. <br /> -tOb <br /> 8 during Or <br /> MPJ <br />