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<br /> 24'January 1996'
<br /> AGE-NG:Project No` 95 0114
<br /> Page 2 of 6 r h s 1 }
<br /> WELL INSTALLATION AND SAMPL`INC-y J L
<br />.t • ',2'3.
<br /> MONITORING WE _
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<br /> Three ground water mOrutoiing wells(MW=1, MW=2 and MW-.3) installed.atthe site in October
<br /> 1993. Total etroleum,h drocarbons,' TpH and „aromatic fi drocarhans benzene,.-.toluerie,
<br /> P Y ( . ) y ( _
<br /> ethylbenzene,and xylenes: BTE&X) were detected in:soil samples,collected from MW-3.:Groimd;
<br /> water:s,amples were collected from,each,well,, four;occasions be't'ween November' 1993 add
<br /> December'1.994.TPH-as,stoddard ,solvent (TPH-stoddax`d)'and,BTE&X were:detected in water.
<br /> samples from each well:
<br /> 3.0. -PROCEDURES ; ..
<br /> ' 3.1. , 'DRILLING AND SAMPLING,.' r'
<br /> On 0 7,and 08 December.-1995, three borings-were 'drilled at the site to depths.of 49.feet below
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<br /> ' 'surface ' de'(bsg). Each boiing was drilled wing a truck-rhounted CINE 75-HT drill rig ecl+�ippe
<br /> with 8:25-inch diameter hollow-stem augers: The drill.rig and two-roan' crew were. supplied by
<br /> Mitchell Drilling Eiwironmental(NOE)of Rancho Cordova, Californi_a:,Each boring was completed
<br /> as round water monitoringwells MW-3R, MW-4 arid NlW-5. The Iocation of the newly installed'
<br /> monitoring wells is depicted in Figure 2.
<br /> Samples were collected ahead of the drill bit at five-foot intervals'in each boring'using a.split ��a�7e
<br /> sampler loade&with three clean,.2 by 6-in6 brass sleeves. A .140-pound hammer,was used to., '
<br /> advance the sampler 18-inches; the number of blows•required to "advance the sarnpler in 6- nc•1�, '
<br /> `increments was recorded.'on,the boring`16" :'-All sampling equipment was washed in,an Alconox .
<br /> solution and rinsed twice with water prior to ea'&sampling,run,'.-.
<br /> For each'sample, both ends'of the'lead tube were covered,;.vith a]uminiim sheets,'capped and sealed'-'
<br /> with tape. The samples were then stored on iice and=transported under chain-of-custody:to Alpha—
<br /> Analytical Laboratories (AAL),in Ukiah;`California. ,
<br /> During•drilling, auger returns were;monitored for,the.presence of organic vapors'.using a photo-
<br /> .ionization detector(PID:•Thermo-Environmental 580A, '10.0 eV, calibrated to isobutylene); Auger ,-,
<br /> 'returns were then'placed'on plastic'sheeting and stored•on-site. -
<br /> 3.2. LOGGING..
<br /> -Soil was extruded from the second brass tube�and screened far the presence of arganrc vapors, using.
<br /> the .PID, ,and,the readings,were;recorded, on the boring logs::°The soil'was then described -in
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