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_. <br /> :.V. x <br /> _ Additional Site Assessment Sep Mb = r <br /> . _ <br /> - h= LANGSTON'S MARKET <br /> Y" 15615 South 7`h`Street;Lathrap .California <br /> _f tin <br /> 1T�T .0. INTRODUCTION _ <br /> ` At the request of Mn-Jarnes Langston,Advanced GeoEnvlxonmental;.Inca(AGE)has prepared this <br /> vi th <br /> 3 <br /> = <br /> additional.-site assessment report.,for the:property,located at 156:15. South 9 ` Stret; Lathrop,? g <br /> Callforilia..T1f site°.and the surrounding area are.illustrated in-Figure 1l. Structures and_monitoring I <br /> well-locations are illustrated on Figure 2 <br /> - <br /> _.. The additional site assessment was corlducted'in accordance with Central.,v.dlley,,Regional�Wate'r_ - " <br /> uali Coritroi"Board CVRW CB idelines.for the in'vesti ation of under aund stora e tank-. ti <br /> Q ty . { Q ) gu. �h g µ g ' - <br /> ST sites.Back Quid inforrrlation and findiii'"sof revlous investi ations at the.site are-included <br /> .{U ) gr, g P.., j g._ <br /> = in the reports titledrnterim Secondary`Source Removal:and Manatoring Well Replacement dated 45 <br /> October '1995, Additional Site Assessment Report dated 03 April 2000, and several=Quaiterly r F <br /> ;Reports prepared by WHF, Inc acid AGE _ �; _ <br /> _V -�V { <br /> 41 <br /> 44 <br /> 2.0; - PROCEDURES <br /> - - <br /> Four ground water monitoring wells' were_installed 'on2 25 and X26 Septelnbet.2000.:-Tasks-and _. _ <br /> `procedures far this investigation'werecompleted byAGE personnel,"or.uncler the direction of AGE T., �N <br /> personnel,-under the.superv'ision of a California Registered Geologist in accordance with PHS-EHD <br /> and•RWQCB'guidelinesend thePHS-EHD_a,provedMonatoring Well-Installation Workplan dated f:_ - <br /> 23 June-200 0 = � _. 4, _� " <br /> 2 1 DRILLIlVG AND SAMPLINGr <br /> L_- <br /> - <br /> On 25 and°26 September 2000;_four soil:bonngs,were advanced-at the site. The`soil bonngs_were <br /> N _. o <br /> t advancedwusing.a.OME-75HT:drill ng, equipped with38 2S-inch diameter;hollow sterri augers to - L <br /> �. <br /> advance`borings M�VI_thraugh MW4 The drill ng aril two rian_crew were supplied by Mitchell m <br /> Drilling Environmental. Auger returns generated by drilling were stored ori=site onpIashc sheeting, _.- - <br /> pPik <br /> ennding laboratory anialysis ..�� <br /> les were collected.ahead of the drill bit_ii in a-California:inodified s lit-s oon'san ler <br /> Soll:samp g - P._ P :.. p <br /> : loaded=with_three pre-cleaned 2-inch by 6=incli:brass'slee"ves:-Tile='samples were co_Ilected from <br /> monitoring well pilot tlorings=MW-5:_through MW 8 at`five foot intervals°{MW-5 at 1:5 feet was..not," f TT <br /> =said led ,be innin at 10feet bs ,iisin °a 140=pound_l am er toadvance the sampler...The ziumber - <br /> _4 - t p } g g g .._ <br /> - of Blows required to advance the sampler over--each-=6 inch,increment.of the :18=inch sampling <br /> ' interval was recorded on the boring:logs.'.Sanipling-equipment`was-washedin an.Alconox.solution . <br /> =Y <br /> andrinsedwith water prior to each sampling run_to minimize cross_contamination r <br /> tea-„ <br /> a 5 �� = Advanced GeurLnvirontnental Inc- <br /> . -' - 44- r- i - -;;- '- <br />