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`FEST 1, N GEGi. t1GIC ry <br /> r� F.' SOuRCE: S , INC, <br /> ]len r-FP..{tiClsc:O R{1t1F:%%RD.Sl1'i'F:A <br /> S10-R{rkm,C%WOR\1{94901 <br /> KvLD MAY 0/� <br /> 41S.V57.7595 r:{\:�IS'4ii•NS!I 2'90 <br /> RECEIVED <br /> 24 April 1990 MAY 8 1990 <br /> Chevrc+n LISA <br /> Jahn RcndSu ENVIRONMENTAL HEALTH <br /> • <br /> .2410(:zminp Ramon ' PERMIT/SERVICES <br /> Sau)ts:non,CA 94533 <br /> Re: Quarterly Groundwater Monitoring <br /> Sampled March 1990 <br /> Chevron Service Station #94275 <br /> Stockton,California <br /> WGR Projcct NI-10.1.06 <br /> t Dear?vie.Randall: <br /> This letter report presents the-resu!ts of the groundwater samplingPerformed Pe by Western <br /> Gco'Qgic Resources,Inc.C 111)at the Chevron service station#94775,located at 2905 W.Benjamin <br /> :sem± Halt Drive,S!acktotr,California(Figure 1). <br /> GROUNDWATER SAMPLI*7G <br /> . On 23 March I990, WGR staff measured depth-to-water,andipurged monitor wells ASW-1 <br /> tht augh MW-5 with dedicated sampling systems. All grounilwateesatnples rare colfectcd according to <br /> °+ WGR.st.ndard operating procedure for groundwater sampling included as Attachment A. Field <br /> Imewm sampling forms arc include as Achmcnt B. <br /> A11 purged water was contained in`$5•gallon drums and temporarily stored on-site pending <br /> analyt,c results. The groundwater samples and a laboratory-supplied travel blank,consisting of dcionizcd <br /> water,seer si=pped under chain-of-custody to Pace Laboratories,Inc.of Novato,California. <br /> GROUNDWATER FLOW <br /> _ <br /> Figure 2 is the potcnliometric surface map of the shallow groundwater,based on depth-to•water <br /> measurements laken on 20 March 199x• Water-elevation data are presented in Table L Hydrographs <br /> showing groundwater elev�-tioss over time are included as Attachment C. Fslimatcd groundwater flow <br /> for 20 Much 19W was to thf,cast-northeast at a gradient of about 05%to 0.8'x,. <br /> :y <br />