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41 <br /> i <br /> r .� <br /> "0. <br /> t. <br /> + w sj,, •S r�'., ? s.'�. -+,.; ,7 �I `•i 7 * , r L.. �. ` 7 a;fw n .err r. ,'•� i y <br /> I ,4• . i+lf x'bt r S r y •. r + r - - r ,� s'J t -'b <br /> QUARTERLY REPORT' , <br /> t ia fi <br /> '-June 1996r <br /> -Hess-DuBois Cleaners „ a <br /> °348 West,Hard ing�Way <br /> StOC1C6A Ca1ifornea' <br /> 10: INTRODUCTION AND SCOPE OF:WORK' <br /> Iri accordance with the request of•1VIr Peter Wallace, property.owner;Advanced'GeoEnvironmerital; a <br /> Inc:(AGE),has"prepared thi Quairtcrly;Report detailing field`activitiesSat 348 West Harding',Way';' <br /> ,• <br /> Stockton;California ,The scope°ofwork. s to' monitor°present ground water conditions,`at tlie'siie. ; <br /> The locaiioh,of the site is:illustrated`in Figure.I --,••Loc'at on Map: A'pian`of the site is'depicted in <br /> previous-w--,Sie Plai:'Sitehistornds'criptio'n' o rk performed at the site.were ` <br /> r <br /> detailed in previous:Quarterly Reports prepared by;AGE: ; <br /> �{ _ <br /> `Field;activities at',the site` yere performed in`Jecordance. with guidelines,for iii`vestigatioil of <br /> ufiderground'storage tank(UST sites established b ;the.San Joa uin Coup Public Health Services <br /> Y tY <br /> Environinental Health Division (PHS=EHD)-aiid•the .Central Valley'.Regional. Water-Quality y' <br /> Control Board.(CVRWQCB) e <br /> ^ ,.2.0: 'PROCEDURES , <br /> 2.1. MONITORING WELL" PURGE PROCEDURES <br /> On 25 June 1996,•a Solinst water level meter was used-to measure the depth t6ground Water-in each <br /> ..well relative to:the,top-of the .well .casing: The relative ground water elevation in each;well and <br />=,• hydraulic gradient,were deterniined�from these'data(Table'1). An:MMC interface probe was used <br /> `to measure any free floatiiig`hydrocarbori product in'well' at the site: <br /> „ After ground water-depths were measured, a pre-cleaned, two-stage submersible pump;was used to.; <br /> • . - purge. wells MW-1 MW-2 MW-3R,- MW-4:'and MW=5. Approximately. 10-; 'allons of water <br /> (minimurri of'three•weil volumes) were re moved_from.each well;stabilizing temperature,'pH}and <br /> conductivity:The ground water parameters were measured"at 2-gallon intervals-:using dn1CM water," <br /> analyzer. Purged water was stored in-55-gallon drums'on site:Monitoring well,stabilizaiion data acid :. k <br /> ' field data sheets are included in Appendix A., <br /> 2.2. COLLECTION OF GROUND•WATER SAMPLES. <br /> f } • 4' <br /> Ground water''samples were collected from each well;using new disposable bailers.'Immediately'. <br /> 1 <br /> upon retrieval; ilie samples were transferred'irito 40=m1 EPA vials c6ntairiirig hydrochloric acid as' 4' <br /> sample:preservative; and were labeled: The samples were:traiisported.ih a;chilled'container'to ti r'Y <br /> «, ; Alpha Analytical Laboratories (AAL) in Ukiah'..Califbmia. Each sample was analyzed for TPH-'ss <br />